diff --git a/go.mod b/go.mod
index 83b14737f208053c6d0089dcf28e51435b14222c..9b275c67b94d2171eb3c560a6195450415700ccf 100644
--- a/go.mod
+++ b/go.mod
@@ -5,7 +5,7 @@ go 1.14
 require (
 	git.autistici.org/ai3/go-common v0.0.0-20210118064555-73f00db54723
 	git.autistici.org/ai3/tools/replds v0.0.0-20210117165138-e6368d266143
-	github.com/miekg/dns v1.1.40
+	github.com/miekg/dns v1.1.43
 	github.com/prometheus/client_golang v1.11.0
 	golang.org/x/crypto v0.0.0-20210220033148-5ea612d1eb83
 	gopkg.in/yaml.v2 v2.4.0
diff --git a/go.sum b/go.sum
index aecf5fb07692bde9eab147278261717a1720cec4..7fa82b6dae17c7f63ef9f6aed825d7db74991083 100644
--- a/go.sum
+++ b/go.sum
@@ -208,6 +208,8 @@ github.com/miekg/dns v1.1.39 h1:6dRfDGnHiXOMmTZkwWANy7bBXXlKls5Qu+pn+Ue0TLo=
 github.com/miekg/dns v1.1.39/go.mod h1:KNUDUusw/aVsxyTYZM1oqvCicbwhgbNgztCETuNZ7xM=
 github.com/miekg/dns v1.1.40 h1:pyyPFfGMnciYUk/mXpKkVmeMQjfXqt3FAJ2hy7tPiLA=
 github.com/miekg/dns v1.1.40/go.mod h1:KNUDUusw/aVsxyTYZM1oqvCicbwhgbNgztCETuNZ7xM=
+github.com/miekg/dns v1.1.43 h1:JKfpVSCB84vrAmHzyrsxB5NAr5kLoMXZArPSw7Qlgyg=
+github.com/miekg/dns v1.1.43/go.mod h1:+evo5L0630/F6ca/Z9+GAqzhjGyn8/c+TBaOyfEl0V4=
 github.com/miscreant/miscreant.go v0.0.0-20200214223636-26d376326b75/go.mod h1:pBbZyGwC5i16IBkjVKoy/sznA8jPD/K9iedwe1ESE6w=
 github.com/mitchellh/cli v1.0.0/go.mod h1:hNIlj7HEI86fIcpObd7a0FcrxTWetlwJDGcceTlRvqc=
 github.com/mitchellh/go-homedir v1.0.0/go.mod h1:SfyaCUpYCn1Vlf4IUYiD9fPX4A5wJrkLzIz1N1q0pr0=
@@ -379,6 +381,8 @@ golang.org/x/net v0.0.0-20190813141303-74dc4d7220e7/go.mod h1:z5CRVTTTmAJ677TzLL
 golang.org/x/net v0.0.0-20190923162816-aa69164e4478/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20200625001655-4c5254603344 h1:vGXIOMxbNfDTk/aXCmfdLgkrSV+Z2tcbze+pEc3v5W4=
 golang.org/x/net v0.0.0-20200625001655-4c5254603344/go.mod h1:/O7V0waA8r7cgGh81Ro3o1hOxt32SMVPicZroKQ2sZA=
+golang.org/x/net v0.0.0-20210226172049-e18ecbb05110 h1:qWPm9rbaAMKs8Bq/9LRpbMqxWRVUAQwMI9fVrssnTfw=
+golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/oauth2 v0.0.0-20190226205417-e64efc72b421/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
 golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
@@ -389,6 +393,8 @@ golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJ
 golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20201207232520-09787c993a3a h1:DcqTD9SDLc+1P/r1EmRBwnVsrOwW+kk2vWf9n+1sGhs=
 golang.org/x/sync v0.0.0-20201207232520-09787c993a3a/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.0.0-20210220032951-036812b2e83c h1:5KslGYwFpkhGh+Q16bwMP3cOontH8FOep7tGV86Y7SQ=
+golang.org/x/sync v0.0.0-20210220032951-036812b2e83c/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sys v0.0.0-20180823144017-11551d06cbcc/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
@@ -410,14 +416,17 @@ golang.org/x/sys v0.0.0-20200106162015-b016eb3dc98e/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200615200032-f1bc736245b1/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200625212154-ddb9806d33ae/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20201214210602-f9fddec55a1e h1:AyodaIpKjppX+cBfTASF2E1US3H2JFBj920Ot3rtDjs=
 golang.org/x/sys v0.0.0-20201214210602-f9fddec55a1e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210113181707-4bcb84eeeb78 h1:nVuTkr9L6Bq62qpUqKo/RnZCFfzDBL0bYo6w9OJUqZY=
 golang.org/x/sys v0.0.0-20210113181707-4bcb84eeeb78/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210124154548-22da62e12c0c/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210303074136-134d130e1a04/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210603081109-ebe580a85c40 h1:JWgyZ1qgdTaF3N3oxC+MdTV7qvEEgHo3otj+HB5CM7Q=
 golang.org/x/sys v0.0.0-20210603081109-ebe580a85c40/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/term v0.0.0-20201117132131-f5c789dd3221/go.mod h1:Nr5EML6q2oocZ2LXRh80K7BxOlk5/8JxuGnuhpl+muw=
+golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
 golang.org/x/text v0.3.3 h1:cokOdA+Jmi5PJGXLlLllQSgYigAEfHXJAERHVMaCc2k=
diff --git a/vendor/github.com/miekg/dns/Makefile.release b/vendor/github.com/miekg/dns/Makefile.release
index 8fb748e8aaef16b6149c9a7cee715b45cbb70e68..a0ce9b712d9bc321931745f92d7505c34161bd20 100644
--- a/vendor/github.com/miekg/dns/Makefile.release
+++ b/vendor/github.com/miekg/dns/Makefile.release
@@ -1,7 +1,7 @@
 # Makefile for releasing.
 #
 # The release is controlled from version.go. The version found there is
-# used to tag the git repo, we're not building any artifects so there is nothing
+# used to tag the git repo, we're not building any artifacts so there is nothing
 # to upload to github.
 #
 # * Up the version in version.go
diff --git a/vendor/github.com/miekg/dns/README.md b/vendor/github.com/miekg/dns/README.md
index 3594492b7cd13217b483f0886c8d8cf9902107a0..d5b78ef41b891f8da03f1139576069d25150a744 100644
--- a/vendor/github.com/miekg/dns/README.md
+++ b/vendor/github.com/miekg/dns/README.md
@@ -171,6 +171,7 @@ Example programs can be found in the `github.com/miekg/exdns` repository.
 * 8080 - EdDSA for DNSSEC
 * 8499 - DNS Terminology
 * 8659 - DNS Certification Authority Authorization (CAA) Resource Record
+* 8914 - Extended DNS Errors
 * 8976 - Message Digest for DNS Zones (ZONEMD RR)
 
 ## Loosely Based Upon
diff --git a/vendor/github.com/miekg/dns/acceptfunc.go b/vendor/github.com/miekg/dns/acceptfunc.go
index 825617fe215beb320733eafdfa0c31087dbe0528..3f29a48c4859868506aec9b4e5bb891f68981a40 100644
--- a/vendor/github.com/miekg/dns/acceptfunc.go
+++ b/vendor/github.com/miekg/dns/acceptfunc.go
@@ -25,6 +25,7 @@ var DefaultMsgAcceptFunc MsgAcceptFunc = defaultMsgAcceptFunc
 // MsgAcceptAction represents the action to be taken.
 type MsgAcceptAction int
 
+// Allowed returned values from a MsgAcceptFunc.
 const (
 	MsgAccept               MsgAcceptAction = iota // Accept the message
 	MsgReject                                      // Reject the message with a RcodeFormatError
diff --git a/vendor/github.com/miekg/dns/client.go b/vendor/github.com/miekg/dns/client.go
index 000dc013cf5b34456d69eb34898f0f89bcb7c8b8..f907698b5d50bb9c2f1a8b20e7e8f65024789f40 100644
--- a/vendor/github.com/miekg/dns/client.go
+++ b/vendor/github.com/miekg/dns/client.go
@@ -379,7 +379,7 @@ func Dial(network, address string) (conn *Conn, err error) {
 func ExchangeContext(ctx context.Context, m *Msg, a string) (r *Msg, err error) {
 	client := Client{Net: "udp"}
 	r, _, err = client.ExchangeContext(ctx, m, a)
-	// ignorint rtt to leave the original ExchangeContext API unchanged, but
+	// ignoring rtt to leave the original ExchangeContext API unchanged, but
 	// this function will go away
 	return r, err
 }
diff --git a/vendor/github.com/miekg/dns/defaults.go b/vendor/github.com/miekg/dns/defaults.go
index d874e3008c21adcf5a585c352a1b2ca831b51f06..d47b0b1f2be2329a40dd1d894bcf081f1e303a18 100644
--- a/vendor/github.com/miekg/dns/defaults.go
+++ b/vendor/github.com/miekg/dns/defaults.go
@@ -349,10 +349,7 @@ func ReverseAddr(addr string) (arpa string, err error) {
 	// Add it, in reverse, to the buffer
 	for i := len(ip) - 1; i >= 0; i-- {
 		v := ip[i]
-		buf = append(buf, hexDigit[v&0xF])
-		buf = append(buf, '.')
-		buf = append(buf, hexDigit[v>>4])
-		buf = append(buf, '.')
+		buf = append(buf, hexDigit[v&0xF], '.', hexDigit[v>>4], '.')
 	}
 	// Append "ip6.arpa." and return (buf already has the final .)
 	buf = append(buf, "ip6.arpa."...)
diff --git a/vendor/github.com/miekg/dns/dnssec.go b/vendor/github.com/miekg/dns/dnssec.go
index 900f6e059d89f42c1d658296f1f514936156ce13..8539aae6c70fd8db712c2143c08d7408653f7dac 100644
--- a/vendor/github.com/miekg/dns/dnssec.go
+++ b/vendor/github.com/miekg/dns/dnssec.go
@@ -4,12 +4,13 @@ import (
 	"bytes"
 	"crypto"
 	"crypto/ecdsa"
+	"crypto/ed25519"
 	"crypto/elliptic"
 	"crypto/rand"
 	"crypto/rsa"
-	_ "crypto/sha1"
-	_ "crypto/sha256"
-	_ "crypto/sha512"
+	_ "crypto/sha1"   // need its init function
+	_ "crypto/sha256" // need its init function
+	_ "crypto/sha512" // need its init function
 	"encoding/asn1"
 	"encoding/binary"
 	"encoding/hex"
@@ -17,8 +18,6 @@ import (
 	"sort"
 	"strings"
 	"time"
-
-	"golang.org/x/crypto/ed25519"
 )
 
 // DNSSEC encryption algorithm codes.
@@ -373,6 +372,8 @@ func sign(k crypto.Signer, hashed []byte, hash crypto.Hash, alg uint8) ([]byte,
 // Verify validates an RRSet with the signature and key. This is only the
 // cryptographic test, the signature validity period must be checked separately.
 // This function copies the rdata of some RRs (to lowercase domain names) for the validation to work.
+// It also checks that the Zone Key bit (RFC 4034 2.1.1) is set on the DNSKEY
+// and that the Protocol field is set to 3 (RFC 4034 2.1.2).
 func (rr *RRSIG) Verify(k *DNSKEY, rrset []RR) error {
 	// First the easy checks
 	if !IsRRset(rrset) {
@@ -393,6 +394,12 @@ func (rr *RRSIG) Verify(k *DNSKEY, rrset []RR) error {
 	if k.Protocol != 3 {
 		return ErrKey
 	}
+	// RFC 4034 2.1.1 If bit 7 has value 0, then the DNSKEY record holds some
+	// other type of DNS public key and MUST NOT be used to verify RRSIGs that
+	// cover RRsets.
+	if k.Flags&ZONE == 0 {
+		return ErrKey
+	}
 
 	// IsRRset checked that we have at least one RR and that the RRs in
 	// the set have consistent type, class, and name. Also check that type and
@@ -500,7 +507,7 @@ func (rr *RRSIG) ValidityPeriod(t time.Time) bool {
 	return ti <= utc && utc <= te
 }
 
-// Return the signatures base64 encodedig sigdata as a byte slice.
+// Return the signatures base64 encoding sigdata as a byte slice.
 func (rr *RRSIG) sigBuf() []byte {
 	sigbuf, err := fromBase64([]byte(rr.Signature))
 	if err != nil {
diff --git a/vendor/github.com/miekg/dns/dnssec_keygen.go b/vendor/github.com/miekg/dns/dnssec_keygen.go
index 2ab7b6d73b80cfea2122fef01dfdee9d1afe693d..b8124b5618e965e288cde31016db08181b5e2930 100644
--- a/vendor/github.com/miekg/dns/dnssec_keygen.go
+++ b/vendor/github.com/miekg/dns/dnssec_keygen.go
@@ -3,12 +3,11 @@ package dns
 import (
 	"crypto"
 	"crypto/ecdsa"
+	"crypto/ed25519"
 	"crypto/elliptic"
 	"crypto/rand"
 	"crypto/rsa"
 	"math/big"
-
-	"golang.org/x/crypto/ed25519"
 )
 
 // Generate generates a DNSKEY of the given bit size.
diff --git a/vendor/github.com/miekg/dns/dnssec_keyscan.go b/vendor/github.com/miekg/dns/dnssec_keyscan.go
index 6cbc28483f139683820381323389c7989ee0cfd4..f79658169fe4ca175cbfe76f95358b8878148072 100644
--- a/vendor/github.com/miekg/dns/dnssec_keyscan.go
+++ b/vendor/github.com/miekg/dns/dnssec_keyscan.go
@@ -4,13 +4,12 @@ import (
 	"bufio"
 	"crypto"
 	"crypto/ecdsa"
+	"crypto/ed25519"
 	"crypto/rsa"
 	"io"
 	"math/big"
 	"strconv"
 	"strings"
-
-	"golang.org/x/crypto/ed25519"
 )
 
 // NewPrivateKey returns a PrivateKey by parsing the string s.
diff --git a/vendor/github.com/miekg/dns/dnssec_privkey.go b/vendor/github.com/miekg/dns/dnssec_privkey.go
index 072e445dadfa7564941b1c270f04df22003a16ed..f160772964bcbcf5bbce6d98eb8b9a519527b274 100644
--- a/vendor/github.com/miekg/dns/dnssec_privkey.go
+++ b/vendor/github.com/miekg/dns/dnssec_privkey.go
@@ -3,11 +3,10 @@ package dns
 import (
 	"crypto"
 	"crypto/ecdsa"
+	"crypto/ed25519"
 	"crypto/rsa"
 	"math/big"
 	"strconv"
-
-	"golang.org/x/crypto/ed25519"
 )
 
 const format = "Private-key-format: v1.3\n"
diff --git a/vendor/github.com/miekg/dns/doc.go b/vendor/github.com/miekg/dns/doc.go
index f7629ec3fff34cc5b88b81aeedd6bf7661b1f5a0..5c83f82e49d47404519177a927c3c3514d4522d0 100644
--- a/vendor/github.com/miekg/dns/doc.go
+++ b/vendor/github.com/miekg/dns/doc.go
@@ -159,7 +159,7 @@ shows the options you have and what functions to call.
 TRANSACTION SIGNATURE
 
 An TSIG or transaction signature adds a HMAC TSIG record to each message sent.
-The supported algorithms include: HmacMD5, HmacSHA1, HmacSHA256 and HmacSHA512.
+The supported algorithms include: HmacSHA1, HmacSHA256 and HmacSHA512.
 
 Basic use pattern when querying with a TSIG name "axfr." (note that these key names
 must be fully qualified - as they are domain names) and the base64 secret
@@ -174,7 +174,7 @@ changes to the RRset after calling SetTsig() the signature will be incorrect.
 	c.TsigSecret = map[string]string{"axfr.": "so6ZGir4GPAqINNh9U5c3A=="}
 	m := new(dns.Msg)
 	m.SetQuestion("miek.nl.", dns.TypeMX)
-	m.SetTsig("axfr.", dns.HmacMD5, 300, time.Now().Unix())
+	m.SetTsig("axfr.", dns.HmacSHA256, 300, time.Now().Unix())
 	...
 	// When sending the TSIG RR is calculated and filled in before sending
 
@@ -187,7 +187,7 @@ request an AXFR for miek.nl. with TSIG key named "axfr." and secret
 	m := new(dns.Msg)
 	t.TsigSecret = map[string]string{"axfr.": "so6ZGir4GPAqINNh9U5c3A=="}
 	m.SetAxfr("miek.nl.")
-	m.SetTsig("axfr.", dns.HmacMD5, 300, time.Now().Unix())
+	m.SetTsig("axfr.", dns.HmacSHA256, 300, time.Now().Unix())
 	c, err := t.In(m, "176.58.119.54:53")
 	for r := range c { ... }
 
@@ -214,7 +214,7 @@ client must be configured with an implementation of the TsigProvider interface:
 	c.TsigProvider = new(Provider)
 	m := new(dns.Msg)
 	m.SetQuestion("miek.nl.", dns.TypeMX)
-	m.SetTsig(keyname, dns.HmacSHA1, 300, time.Now().Unix())
+	m.SetTsig(keyname, dns.HmacSHA256, 300, time.Now().Unix())
 	...
 	// TSIG RR is calculated by calling your Generate method
 
@@ -231,7 +231,7 @@ Basic use pattern validating and replying to a message that has TSIG set.
 		if r.IsTsig() != nil {
 			if w.TsigStatus() == nil {
 				// *Msg r has an TSIG record and it was validated
-				m.SetTsig("axfr.", dns.HmacMD5, 300, time.Now().Unix())
+				m.SetTsig("axfr.", dns.HmacSHA256, 300, time.Now().Unix())
 			} else {
 				// *Msg r has an TSIG records and it was not validated
 			}
diff --git a/vendor/github.com/miekg/dns/edns.go b/vendor/github.com/miekg/dns/edns.go
index f3fb1c6849511965fe980ee3d4a512366853772a..c9181783de12883295653b55534586d4515c1bc3 100644
--- a/vendor/github.com/miekg/dns/edns.go
+++ b/vendor/github.com/miekg/dns/edns.go
@@ -22,11 +22,47 @@ const (
 	EDNS0COOKIE       = 0xa     // EDNS0 Cookie
 	EDNS0TCPKEEPALIVE = 0xb     // EDNS0 tcp keep alive (See RFC 7828)
 	EDNS0PADDING      = 0xc     // EDNS0 padding (See RFC 7830)
+	EDNS0EDE          = 0xf     // EDNS0 extended DNS errors (See RFC 8914)
 	EDNS0LOCALSTART   = 0xFDE9  // Beginning of range reserved for local/experimental use (See RFC 6891)
 	EDNS0LOCALEND     = 0xFFFE  // End of range reserved for local/experimental use (See RFC 6891)
 	_DO               = 1 << 15 // DNSSEC OK
 )
 
+// makeDataOpt is used to unpack the EDNS0 option(s) from a message.
+func makeDataOpt(code uint16) EDNS0 {
+	// All the EDNS0.* constants above need to be in this switch.
+	switch code {
+	case EDNS0LLQ:
+		return new(EDNS0_LLQ)
+	case EDNS0UL:
+		return new(EDNS0_UL)
+	case EDNS0NSID:
+		return new(EDNS0_NSID)
+	case EDNS0DAU:
+		return new(EDNS0_DAU)
+	case EDNS0DHU:
+		return new(EDNS0_DHU)
+	case EDNS0N3U:
+		return new(EDNS0_N3U)
+	case EDNS0SUBNET:
+		return new(EDNS0_SUBNET)
+	case EDNS0EXPIRE:
+		return new(EDNS0_EXPIRE)
+	case EDNS0COOKIE:
+		return new(EDNS0_COOKIE)
+	case EDNS0TCPKEEPALIVE:
+		return new(EDNS0_TCP_KEEPALIVE)
+	case EDNS0PADDING:
+		return new(EDNS0_PADDING)
+	case EDNS0EDE:
+		return new(EDNS0_EDE)
+	default:
+		e := new(EDNS0_LOCAL)
+		e.Code = code
+		return e
+	}
+}
+
 // OPT is the EDNS0 RR appended to messages to convey extra (meta) information.
 // See RFC 6891.
 type OPT struct {
@@ -73,6 +109,8 @@ func (rr *OPT) String() string {
 			s += "\n; LOCAL OPT: " + o.String()
 		case *EDNS0_PADDING:
 			s += "\n; PADDING: " + o.String()
+		case *EDNS0_EDE:
+			s += "\n; EDE: " + o.String()
 		}
 	}
 	return s
@@ -92,7 +130,7 @@ func (*OPT) parse(c *zlexer, origin string) *ParseError {
 	return &ParseError{err: "OPT records do not have a presentation format"}
 }
 
-func (r1 *OPT) isDuplicate(r2 RR) bool { return false }
+func (rr *OPT) isDuplicate(r2 RR) bool { return false }
 
 // return the old value -> delete SetVersion?
 
@@ -148,6 +186,16 @@ func (rr *OPT) SetDo(do ...bool) {
 	}
 }
 
+// Z returns the Z part of the OPT RR as a uint16 with only the 15 least significant bits used.
+func (rr *OPT) Z() uint16 {
+	return uint16(rr.Hdr.Ttl & 0x7FFF)
+}
+
+// SetZ sets the Z part of the OPT RR, note only the 15 least significant bits of z are used.
+func (rr *OPT) SetZ(z uint16) {
+	rr.Hdr.Ttl = rr.Hdr.Ttl&^0x7FFF | uint32(z&0x7FFF)
+}
+
 // EDNS0 defines an EDNS0 Option. An OPT RR can have multiple options appended to it.
 type EDNS0 interface {
 	// Option returns the option code for the option.
@@ -452,7 +500,7 @@ func (e *EDNS0_LLQ) copy() EDNS0 {
 	return &EDNS0_LLQ{e.Code, e.Version, e.Opcode, e.Error, e.Id, e.LeaseLife}
 }
 
-// EDNS0_DUA implements the EDNS0 "DNSSEC Algorithm Understood" option. See RFC 6975.
+// EDNS0_DAU implements the EDNS0 "DNSSEC Algorithm Understood" option. See RFC 6975.
 type EDNS0_DAU struct {
 	Code    uint16 // Always EDNS0DAU
 	AlgCode []uint8
@@ -525,7 +573,7 @@ func (e *EDNS0_N3U) String() string {
 }
 func (e *EDNS0_N3U) copy() EDNS0 { return &EDNS0_N3U{e.Code, e.AlgCode} }
 
-// EDNS0_EXPIRE implementes the EDNS0 option as described in RFC 7314.
+// EDNS0_EXPIRE implements the EDNS0 option as described in RFC 7314.
 type EDNS0_EXPIRE struct {
 	Code   uint16 // Always EDNS0EXPIRE
 	Expire uint32
@@ -673,3 +721,101 @@ func (e *EDNS0_PADDING) copy() EDNS0 {
 	copy(b, e.Padding)
 	return &EDNS0_PADDING{b}
 }
+
+// Extended DNS Error Codes (RFC 8914).
+const (
+	ExtendedErrorCodeOther uint16 = iota
+	ExtendedErrorCodeUnsupportedDNSKEYAlgorithm
+	ExtendedErrorCodeUnsupportedDSDigestType
+	ExtendedErrorCodeStaleAnswer
+	ExtendedErrorCodeForgedAnswer
+	ExtendedErrorCodeDNSSECIndeterminate
+	ExtendedErrorCodeDNSBogus
+	ExtendedErrorCodeSignatureExpired
+	ExtendedErrorCodeSignatureNotYetValid
+	ExtendedErrorCodeDNSKEYMissing
+	ExtendedErrorCodeRRSIGsMissing
+	ExtendedErrorCodeNoZoneKeyBitSet
+	ExtendedErrorCodeNSECMissing
+	ExtendedErrorCodeCachedError
+	ExtendedErrorCodeNotReady
+	ExtendedErrorCodeBlocked
+	ExtendedErrorCodeCensored
+	ExtendedErrorCodeFiltered
+	ExtendedErrorCodeProhibited
+	ExtendedErrorCodeStaleNXDOMAINAnswer
+	ExtendedErrorCodeNotAuthoritative
+	ExtendedErrorCodeNotSupported
+	ExtendedErrorCodeNoReachableAuthority
+	ExtendedErrorCodeNetworkError
+	ExtendedErrorCodeInvalidData
+)
+
+// ExtendedErrorCodeToString maps extended error info codes to a human readable
+// description.
+var ExtendedErrorCodeToString = map[uint16]string{
+	ExtendedErrorCodeOther:                      "Other",
+	ExtendedErrorCodeUnsupportedDNSKEYAlgorithm: "Unsupported DNSKEY Algorithm",
+	ExtendedErrorCodeUnsupportedDSDigestType:    "Unsupported DS Digest Type",
+	ExtendedErrorCodeStaleAnswer:                "Stale Answer",
+	ExtendedErrorCodeForgedAnswer:               "Forged Answer",
+	ExtendedErrorCodeDNSSECIndeterminate:        "DNSSEC Indeterminate",
+	ExtendedErrorCodeDNSBogus:                   "DNSSEC Bogus",
+	ExtendedErrorCodeSignatureExpired:           "Signature Expired",
+	ExtendedErrorCodeSignatureNotYetValid:       "Signature Not Yet Valid",
+	ExtendedErrorCodeDNSKEYMissing:              "DNSKEY Missing",
+	ExtendedErrorCodeRRSIGsMissing:              "RRSIGs Missing",
+	ExtendedErrorCodeNoZoneKeyBitSet:            "No Zone Key Bit Set",
+	ExtendedErrorCodeNSECMissing:                "NSEC Missing",
+	ExtendedErrorCodeCachedError:                "Cached Error",
+	ExtendedErrorCodeNotReady:                   "Not Ready",
+	ExtendedErrorCodeBlocked:                    "Blocked",
+	ExtendedErrorCodeCensored:                   "Censored",
+	ExtendedErrorCodeFiltered:                   "Filtered",
+	ExtendedErrorCodeProhibited:                 "Prohibited",
+	ExtendedErrorCodeStaleNXDOMAINAnswer:        "Stale NXDOMAIN Answer",
+	ExtendedErrorCodeNotAuthoritative:           "Not Authoritative",
+	ExtendedErrorCodeNotSupported:               "Not Supported",
+	ExtendedErrorCodeNoReachableAuthority:       "No Reachable Authority",
+	ExtendedErrorCodeNetworkError:               "Network Error",
+	ExtendedErrorCodeInvalidData:                "Invalid Data",
+}
+
+// StringToExtendedErrorCode is a map from human readable descriptions to
+// extended error info codes.
+var StringToExtendedErrorCode = reverseInt16(ExtendedErrorCodeToString)
+
+// EDNS0_EDE option is used to return additional information about the cause of
+// DNS errors.
+type EDNS0_EDE struct {
+	InfoCode  uint16
+	ExtraText string
+}
+
+// Option implements the EDNS0 interface.
+func (e *EDNS0_EDE) Option() uint16 { return EDNS0EDE }
+func (e *EDNS0_EDE) copy() EDNS0    { return &EDNS0_EDE{e.InfoCode, e.ExtraText} }
+
+func (e *EDNS0_EDE) String() string {
+	info := strconv.FormatUint(uint64(e.InfoCode), 10)
+	if s, ok := ExtendedErrorCodeToString[e.InfoCode]; ok {
+		info += fmt.Sprintf(" (%s)", s)
+	}
+	return fmt.Sprintf("%s: (%s)", info, e.ExtraText)
+}
+
+func (e *EDNS0_EDE) pack() ([]byte, error) {
+	b := make([]byte, 2+len(e.ExtraText))
+	binary.BigEndian.PutUint16(b[0:], e.InfoCode)
+	copy(b[2:], []byte(e.ExtraText))
+	return b, nil
+}
+
+func (e *EDNS0_EDE) unpack(b []byte) error {
+	if len(b) < 2 {
+		return ErrBuf
+	}
+	e.InfoCode = binary.BigEndian.Uint16(b[0:])
+	e.ExtraText = string(b[2:])
+	return nil
+}
diff --git a/vendor/github.com/miekg/dns/go.mod b/vendor/github.com/miekg/dns/go.mod
index 6003d0573c6eb266d6ef9eae6ad45eabb613c41a..aff65114de26e6cf87fb47dc74b6b28828986030 100644
--- a/vendor/github.com/miekg/dns/go.mod
+++ b/vendor/github.com/miekg/dns/go.mod
@@ -1,11 +1,9 @@
 module github.com/miekg/dns
 
-go 1.12
+go 1.14
 
 require (
-	golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550
-	golang.org/x/net v0.0.0-20190923162816-aa69164e4478
-	golang.org/x/sync v0.0.0-20190423024810-112230192c58
-	golang.org/x/sys v0.0.0-20190924154521-2837fb4f24fe
-	golang.org/x/tools v0.0.0-20191216052735-49a3e744a425 // indirect
+	golang.org/x/net v0.0.0-20210226172049-e18ecbb05110
+	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c
+	golang.org/x/sys v0.0.0-20210303074136-134d130e1a04
 )
diff --git a/vendor/github.com/miekg/dns/go.sum b/vendor/github.com/miekg/dns/go.sum
index 96bda3a94128ad4fcb0ff726d4ff99aa74b840e2..3359ebea4e8839433322df971f103ef7275b3223 100644
--- a/vendor/github.com/miekg/dns/go.sum
+++ b/vendor/github.com/miekg/dns/go.sum
@@ -1,39 +1,10 @@
-golang.org/x/crypto v0.0.0-20181001203147-e3636079e1a4 h1:Vk3wNqEZwyGyei9yq5ekj7frek2u7HUfffJ1/opblzc=
-golang.org/x/crypto v0.0.0-20181001203147-e3636079e1a4/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
-golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
-golang.org/x/crypto v0.0.0-20190829043050-9756ffdc2472 h1:Gv7RPwsi3eZ2Fgewe3CBsuOebPwO27PoXzRpJPsvSSM=
-golang.org/x/crypto v0.0.0-20190829043050-9756ffdc2472/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
-golang.org/x/crypto v0.0.0-20190923035154-9ee001bba392 h1:ACG4HJsFiNMf47Y4PeRoebLNy/2lXT9EtprMuTFWt1M=
-golang.org/x/crypto v0.0.0-20190923035154-9ee001bba392/go.mod h1:/lpIB1dKB+9EgE3H3cr1v9wB50oz8l4C4h62xy7jSTY=
-golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550 h1:ObdrDkeb4kJdCP557AjRjq69pTHfNouLtWZG7j9rPN8=
-golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
-golang.org/x/mod v0.1.1-0.20191105210325-c90efee705ee/go.mod h1:QqPTAvyqsEbceGzBzNggFXnrqF1CaUcvgkdR5Ot7KZg=
-golang.org/x/net v0.0.0-20180926154720-4dfa2610cdf3 h1:dgd4x4kJt7G4k4m93AYLzM8Ni6h2qLTfh9n9vXJT3/0=
-golang.org/x/net v0.0.0-20180926154720-4dfa2610cdf3/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
-golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
-golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
-golang.org/x/net v0.0.0-20190827160401-ba9fcec4b297 h1:k7pJ2yAPLPgbskkFdhRCsA77k2fySZ1zf2zCjvQCiIM=
-golang.org/x/net v0.0.0-20190827160401-ba9fcec4b297/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
-golang.org/x/net v0.0.0-20190923162816-aa69164e4478 h1:l5EDrHhldLYb3ZRHDUhXF7Om7MvYXnkV9/iQNo1lX6g=
-golang.org/x/net v0.0.0-20190923162816-aa69164e4478/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
-golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f h1:wMNYb4v58l5UBM7MYRLPG6ZhfOqbKu7X5eyFl8ZhKvA=
-golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sync v0.0.0-20190423024810-112230192c58 h1:8gQV6CLnAEikrhgkHFbMAEhagSSnXWGV915qUMm9mrU=
-golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sys v0.0.0-20180928133829-e4b3c5e90611 h1:O33LKL7WyJgjN9CvxfTIomjIClbd/Kq86/iipowHQU0=
-golang.org/x/sys v0.0.0-20180928133829-e4b3c5e90611/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
-golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
-golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20190904154756-749cb33beabd h1:DBH9mDw0zluJT/R+nGuV3jWFWLFaHyYZWD4tOT+cjn0=
-golang.org/x/sys v0.0.0-20190904154756-749cb33beabd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20190922100055-0a153f010e69/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20190924154521-2837fb4f24fe h1:6fAMxZRR6sl1Uq8U61gxU+kPTs2tR8uOySCbBP7BN/M=
-golang.org/x/sys v0.0.0-20190924154521-2837fb4f24fe/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
-golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
+golang.org/x/net v0.0.0-20210226172049-e18ecbb05110 h1:qWPm9rbaAMKs8Bq/9LRpbMqxWRVUAQwMI9fVrssnTfw=
+golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
+golang.org/x/sync v0.0.0-20210220032951-036812b2e83c h1:5KslGYwFpkhGh+Q16bwMP3cOontH8FOep7tGV86Y7SQ=
+golang.org/x/sync v0.0.0-20210220032951-036812b2e83c/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210303074136-134d130e1a04 h1:cEhElsAv9LUt9ZUUocxzWe05oFLVd+AA2nstydTeI8g=
+golang.org/x/sys v0.0.0-20210303074136-134d130e1a04/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
+golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
-golang.org/x/tools v0.0.0-20190907020128-2ca718005c18/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
-golang.org/x/tools v0.0.0-20191216052735-49a3e744a425 h1:VvQyQJN0tSuecqgcIxMWnnfG5kSmgy9KZR9sW3W5QeA=
-golang.org/x/tools v0.0.0-20191216052735-49a3e744a425/go.mod h1:TB2adYChydJhpapKDTa4BR/hXlZSLoq2Wpct/0txZ28=
-golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
diff --git a/vendor/github.com/miekg/dns/labels.go b/vendor/github.com/miekg/dns/labels.go
index df1675dfd28037db42dce1a6a199fbc87ce724f3..f9faacfeb4101ce7e8543a2f8d449f9ad0167af4 100644
--- a/vendor/github.com/miekg/dns/labels.go
+++ b/vendor/github.com/miekg/dns/labels.go
@@ -10,7 +10,7 @@ package dns
 // escaped dots (\.) for instance.
 // s must be a syntactically valid domain name, see IsDomainName.
 func SplitDomainName(s string) (labels []string) {
-	if len(s) == 0 {
+	if s == "" {
 		return nil
 	}
 	fqdnEnd := 0 // offset of the final '.' or the length of the name
diff --git a/vendor/github.com/miekg/dns/listen_go_not111.go b/vendor/github.com/miekg/dns/listen_no_reuseport.go
similarity index 100%
rename from vendor/github.com/miekg/dns/listen_go_not111.go
rename to vendor/github.com/miekg/dns/listen_no_reuseport.go
diff --git a/vendor/github.com/miekg/dns/listen_go111.go b/vendor/github.com/miekg/dns/listen_reuseport.go
similarity index 100%
rename from vendor/github.com/miekg/dns/listen_go111.go
rename to vendor/github.com/miekg/dns/listen_reuseport.go
diff --git a/vendor/github.com/miekg/dns/msg.go b/vendor/github.com/miekg/dns/msg.go
index 1728a98b7dc2ece72793785c526afc065c41b04d..ead4b6931df5b5885eb88b470dd4bc0acc1346ce 100644
--- a/vendor/github.com/miekg/dns/msg.go
+++ b/vendor/github.com/miekg/dns/msg.go
@@ -742,7 +742,7 @@ func (dns *Msg) packBufferWithCompressionMap(buf []byte, compression compression
 	}
 
 	// Set extended rcode unconditionally if we have an opt, this will allow
-	// reseting the extended rcode bits if they need to.
+	// resetting the extended rcode bits if they need to.
 	if opt := dns.IsEdns0(); opt != nil {
 		opt.SetExtendedRcode(uint16(dns.Rcode))
 	} else if dns.Rcode > 0xF {
diff --git a/vendor/github.com/miekg/dns/msg_helpers.go b/vendor/github.com/miekg/dns/msg_helpers.go
index 47625ed0902d627c2311539a226652a5777e2a9f..5904927ca8b05bd380d0295773bc99a6587a0035 100644
--- a/vendor/github.com/miekg/dns/msg_helpers.go
+++ b/vendor/github.com/miekg/dns/msg_helpers.go
@@ -438,35 +438,6 @@ Option:
 	return edns, off, nil
 }
 
-func makeDataOpt(code uint16) EDNS0 {
-	switch code {
-	case EDNS0NSID:
-		return new(EDNS0_NSID)
-	case EDNS0SUBNET:
-		return new(EDNS0_SUBNET)
-	case EDNS0COOKIE:
-		return new(EDNS0_COOKIE)
-	case EDNS0EXPIRE:
-		return new(EDNS0_EXPIRE)
-	case EDNS0UL:
-		return new(EDNS0_UL)
-	case EDNS0LLQ:
-		return new(EDNS0_LLQ)
-	case EDNS0DAU:
-		return new(EDNS0_DAU)
-	case EDNS0DHU:
-		return new(EDNS0_DHU)
-	case EDNS0N3U:
-		return new(EDNS0_N3U)
-	case EDNS0PADDING:
-		return new(EDNS0_PADDING)
-	default:
-		e := new(EDNS0_LOCAL)
-		e.Code = code
-		return e
-	}
-}
-
 func packDataOpt(options []EDNS0, msg []byte, off int) (int, error) {
 	for _, el := range options {
 		b, err := el.pack()
diff --git a/vendor/github.com/miekg/dns/privaterr.go b/vendor/github.com/miekg/dns/privaterr.go
index cda6cae31e1245573db0eb868ad6fc963bf87bb8..d256b652ea7bab6f85bb13ec28223d387a7aaabd 100644
--- a/vendor/github.com/miekg/dns/privaterr.go
+++ b/vendor/github.com/miekg/dns/privaterr.go
@@ -6,7 +6,7 @@ import "strings"
 // RFC 6895. This allows one to experiment with new RR types, without requesting an
 // official type code. Also see dns.PrivateHandle and dns.PrivateHandleRemove.
 type PrivateRdata interface {
-	// String returns the text presentaton of the Rdata of the Private RR.
+	// String returns the text presentation of the Rdata of the Private RR.
 	String() string
 	// Parse parses the Rdata of the private RR.
 	Parse([]string) error
@@ -90,7 +90,7 @@ Fetch:
 	return nil
 }
 
-func (r1 *PrivateRR) isDuplicate(r2 RR) bool { return false }
+func (r *PrivateRR) isDuplicate(r2 RR) bool { return false }
 
 // PrivateHandle registers a private resource record type. It requires
 // string and numeric representation of private RR type and generator function as argument.
diff --git a/vendor/github.com/miekg/dns/scan.go b/vendor/github.com/miekg/dns/scan.go
index 67161de29cda355180633708502640934ab1a0da..57be98827722249d38f716ba13552bd062fef46d 100644
--- a/vendor/github.com/miekg/dns/scan.go
+++ b/vendor/github.com/miekg/dns/scan.go
@@ -150,6 +150,9 @@ func ReadRR(r io.Reader, file string) (RR, error) {
 // The text "; this is comment" is returned from Comment. Comments inside
 // the RR are returned concatenated along with the RR. Comments on a line
 // by themselves are discarded.
+//
+// Callers should not assume all returned data in an Resource Record is
+// syntactically correct, e.g. illegal base64 in RRSIGs will be returned as-is.
 type ZoneParser struct {
 	c *zlexer
 
@@ -1233,7 +1236,7 @@ func stringToCm(token string) (e, m uint8, ok bool) {
 			// 'nn.1' must be treated as 'nn-meters and 10cm, not 1cm.
 			cmeters *= 10
 		}
-		if len(s[0]) == 0 {
+		if s[0] == "" {
 			// This will allow omitting the 'meter' part, like .01 (meaning 0.01m = 1cm).
 			break
 		}
@@ -1352,7 +1355,7 @@ func stringToNodeID(l lex) (uint64, *ParseError) {
 	if len(l.token) < 19 {
 		return 0, &ParseError{l.token, "bad NID/L64 NodeID/Locator64", l}
 	}
-	// There must be three colons at fixes postitions, if not its a parse error
+	// There must be three colons at fixes positions, if not its a parse error
 	if l.token[4] != ':' && l.token[9] != ':' && l.token[14] != ':' {
 		return 0, &ParseError{l.token, "bad NID/L64 NodeID/Locator64", l}
 	}
diff --git a/vendor/github.com/miekg/dns/scan_rr.go b/vendor/github.com/miekg/dns/scan_rr.go
index 23b4043bcd5f4843a158b89ad33cd67112255fcc..e398484da9aa554fdfad11acb8867070603a2343 100644
--- a/vendor/github.com/miekg/dns/scan_rr.go
+++ b/vendor/github.com/miekg/dns/scan_rr.go
@@ -609,7 +609,7 @@ func (rr *LOC) parse(c *zlexer, o string) *ParseError {
 
 	c.Next() // zBlank
 	l, _ = c.Next()
-	if i, err := strconv.ParseFloat(l.token, 32); err != nil || l.err || i < 0 || i >= 60 {
+	if i, err := strconv.ParseFloat(l.token, 64); err != nil || l.err || i < 0 || i >= 60 {
 		return &ParseError{"", "bad LOC Latitude seconds", l}
 	} else {
 		rr.Latitude += uint32(1000 * i)
@@ -645,7 +645,7 @@ East:
 	}
 	c.Next() // zBlank
 	l, _ = c.Next()
-	if i, err := strconv.ParseFloat(l.token, 32); err != nil || l.err || i < 0 || i >= 60 {
+	if i, err := strconv.ParseFloat(l.token, 64); err != nil || l.err || i < 0 || i >= 60 {
 		return &ParseError{"", "bad LOC Longitude seconds", l}
 	} else {
 		rr.Longitude += uint32(1000 * i)
@@ -662,7 +662,7 @@ East:
 Altitude:
 	c.Next() // zBlank
 	l, _ = c.Next()
-	if len(l.token) == 0 || l.err {
+	if l.token == "" || l.err {
 		return &ParseError{"", "bad LOC Altitude", l}
 	}
 	if l.token[len(l.token)-1] == 'M' || l.token[len(l.token)-1] == 'm' {
@@ -722,7 +722,7 @@ func (rr *HIP) parse(c *zlexer, o string) *ParseError {
 
 	c.Next()        // zBlank
 	l, _ = c.Next() // zString
-	if len(l.token) == 0 || l.err {
+	if l.token == "" || l.err {
 		return &ParseError{"", "bad HIP Hit", l}
 	}
 	rr.Hit = l.token // This can not contain spaces, see RFC 5205 Section 6.
@@ -730,11 +730,15 @@ func (rr *HIP) parse(c *zlexer, o string) *ParseError {
 
 	c.Next()        // zBlank
 	l, _ = c.Next() // zString
-	if len(l.token) == 0 || l.err {
+	if l.token == "" || l.err {
 		return &ParseError{"", "bad HIP PublicKey", l}
 	}
 	rr.PublicKey = l.token // This cannot contain spaces
-	rr.PublicKeyLength = uint16(base64.StdEncoding.DecodedLen(len(rr.PublicKey)))
+	decodedPK, decodedPKerr := base64.StdEncoding.DecodeString(rr.PublicKey)
+	if decodedPKerr != nil {
+		return &ParseError{"", "bad HIP PublicKey", l}
+	}
+	rr.PublicKeyLength = uint16(len(decodedPK))
 
 	// RendezvousServers (if any)
 	l, _ = c.Next()
@@ -846,6 +850,38 @@ func (rr *CSYNC) parse(c *zlexer, o string) *ParseError {
 	return nil
 }
 
+func (rr *ZONEMD) parse(c *zlexer, o string) *ParseError {
+	l, _ := c.Next()
+	i, e := strconv.ParseUint(l.token, 10, 32)
+	if e != nil || l.err {
+		return &ParseError{"", "bad ZONEMD Serial", l}
+	}
+	rr.Serial = uint32(i)
+
+	c.Next() // zBlank
+	l, _ = c.Next()
+	i, e1 := strconv.ParseUint(l.token, 10, 8)
+	if e1 != nil || l.err {
+		return &ParseError{"", "bad ZONEMD Scheme", l}
+	}
+	rr.Scheme = uint8(i)
+
+	c.Next() // zBlank
+	l, _ = c.Next()
+	i, err := strconv.ParseUint(l.token, 10, 8)
+	if err != nil || l.err {
+		return &ParseError{"", "bad ZONEMD Hash Algorithm", l}
+	}
+	rr.Hash = uint8(i)
+
+	s, e2 := endingToString(c, "bad ZONEMD Digest")
+	if e2 != nil {
+		return e2
+	}
+	rr.Digest = s
+	return nil
+}
+
 func (rr *SIG) parse(c *zlexer, o string) *ParseError { return rr.RRSIG.parse(c, o) }
 
 func (rr *RRSIG) parse(c *zlexer, o string) *ParseError {
@@ -997,7 +1033,7 @@ func (rr *NSEC3) parse(c *zlexer, o string) *ParseError {
 	rr.Iterations = uint16(i)
 	c.Next()
 	l, _ = c.Next()
-	if len(l.token) == 0 || l.err {
+	if l.token == "" || l.err {
 		return &ParseError{"", "bad NSEC3 Salt", l}
 	}
 	if l.token != "-" {
@@ -1007,7 +1043,7 @@ func (rr *NSEC3) parse(c *zlexer, o string) *ParseError {
 
 	c.Next()
 	l, _ = c.Next()
-	if len(l.token) == 0 || l.err {
+	if l.token == "" || l.err {
 		return &ParseError{"", "bad NSEC3 NextDomain", l}
 	}
 	rr.HashLength = 20 // Fix for NSEC3 (sha1 160 bits)
diff --git a/vendor/github.com/miekg/dns/sig0.go b/vendor/github.com/miekg/dns/sig0.go
index 9ef13ccf3926c7338fe3ab88e479cb4fdc55cef9..e781c9bb6c287d3baaf3fd7ea774da2b519d175d 100644
--- a/vendor/github.com/miekg/dns/sig0.go
+++ b/vendor/github.com/miekg/dns/sig0.go
@@ -17,7 +17,7 @@ func (rr *SIG) Sign(k crypto.Signer, m *Msg) ([]byte, error) {
 	if k == nil {
 		return nil, ErrPrivKey
 	}
-	if rr.KeyTag == 0 || len(rr.SignerName) == 0 || rr.Algorithm == 0 {
+	if rr.KeyTag == 0 || rr.SignerName == "" || rr.Algorithm == 0 {
 		return nil, ErrKey
 	}
 
@@ -78,7 +78,7 @@ func (rr *SIG) Verify(k *KEY, buf []byte) error {
 	if k == nil {
 		return ErrKey
 	}
-	if rr.KeyTag == 0 || len(rr.SignerName) == 0 || rr.Algorithm == 0 {
+	if rr.KeyTag == 0 || rr.SignerName == "" || rr.Algorithm == 0 {
 		return ErrKey
 	}
 
diff --git a/vendor/github.com/miekg/dns/svcb.go b/vendor/github.com/miekg/dns/svcb.go
index 1373fe21b730477d385afe53d6355b6f524aff0c..3344253c2b3e64c242cd0625dd9c5f8cf26203b4 100644
--- a/vendor/github.com/miekg/dns/svcb.go
+++ b/vendor/github.com/miekg/dns/svcb.go
@@ -10,6 +10,7 @@ import (
 	"strings"
 )
 
+// SVCBKey is the type of the keys used in the SVCB RR.
 type SVCBKey uint16
 
 // Keys defined in draft-ietf-dnsop-svcb-https-01 Section 12.3.2.
@@ -321,7 +322,7 @@ func (s *SVCBAlpn) pack() ([]byte, error) {
 	// Liberally estimate the size of an alpn as 10 octets
 	b := make([]byte, 0, 10*len(s.Alpn))
 	for _, e := range s.Alpn {
-		if len(e) == 0 {
+		if e == "" {
 			return nil, errors.New("dns: svcbalpn: empty alpn-id")
 		}
 		if len(e) > 255 {
@@ -390,7 +391,7 @@ func (*SVCBNoDefaultAlpn) unpack(b []byte) error {
 }
 
 func (*SVCBNoDefaultAlpn) parse(b string) error {
-	if len(b) != 0 {
+	if b != "" {
 		return errors.New("dns: svcbnodefaultalpn: no_default_alpn must have no value")
 	}
 	return nil
@@ -511,8 +512,13 @@ func (s *SVCBIPv4Hint) parse(b string) error {
 }
 
 func (s *SVCBIPv4Hint) copy() SVCBKeyValue {
+	hint := make([]net.IP, len(s.Hint))
+	for i, ip := range s.Hint {
+		hint[i] = copyIP(ip)
+	}
+
 	return &SVCBIPv4Hint{
-		append([]net.IP(nil), s.Hint...),
+		Hint: hint,
 	}
 }
 
@@ -629,8 +635,13 @@ func (s *SVCBIPv6Hint) parse(b string) error {
 }
 
 func (s *SVCBIPv6Hint) copy() SVCBKeyValue {
+	hint := make([]net.IP, len(s.Hint))
+	for i, ip := range s.Hint {
+		hint[i] = copyIP(ip)
+	}
+
 	return &SVCBIPv6Hint{
-		append([]net.IP(nil), s.Hint...),
+		Hint: hint,
 	}
 }
 
diff --git a/vendor/github.com/miekg/dns/types.go b/vendor/github.com/miekg/dns/types.go
index 9e379eb351bc1798b59ff12a6b80ee8ba1131d34..d9becb67cd9ffda819355b5f41b1ec0a1bc77bd2 100644
--- a/vendor/github.com/miekg/dns/types.go
+++ b/vendor/github.com/miekg/dns/types.go
@@ -81,6 +81,7 @@ const (
 	TypeCDNSKEY    uint16 = 60
 	TypeOPENPGPKEY uint16 = 61
 	TypeCSYNC      uint16 = 62
+	TypeZONEMD     uint16 = 63
 	TypeSVCB       uint16 = 64
 	TypeHTTPS      uint16 = 65
 	TypeSPF        uint16 = 99
@@ -150,6 +151,14 @@ const (
 	OpcodeUpdate = 5
 )
 
+// Used in ZONEMD https://tools.ietf.org/html/rfc8976
+const (
+	ZoneMDSchemeSimple = 1
+
+	ZoneMDHashAlgSHA384 = 1
+	ZoneMDHashAlgSHA512 = 2
+)
+
 // Header is the wire format for the DNS packet header.
 type Header struct {
 	Id                                 uint16
@@ -1361,6 +1370,23 @@ func (rr *CSYNC) len(off int, compression map[string]struct{}) int {
 	return l
 }
 
+// ZONEMD RR, from draft-ietf-dnsop-dns-zone-digest
+type ZONEMD struct {
+	Hdr    RR_Header
+	Serial uint32
+	Scheme uint8
+	Hash   uint8
+	Digest string `dns:"hex"`
+}
+
+func (rr *ZONEMD) String() string {
+	return rr.Hdr.String() +
+		strconv.Itoa(int(rr.Serial)) +
+		" " + strconv.Itoa(int(rr.Scheme)) +
+		" " + strconv.Itoa(int(rr.Hash)) +
+		" " + rr.Digest
+}
+
 // APL RR. See RFC 3123.
 type APL struct {
 	Hdr      RR_Header
@@ -1387,13 +1413,13 @@ func (rr *APL) String() string {
 }
 
 // str returns presentation form of the APL prefix.
-func (p *APLPrefix) str() string {
+func (a *APLPrefix) str() string {
 	var sb strings.Builder
-	if p.Negation {
+	if a.Negation {
 		sb.WriteByte('!')
 	}
 
-	switch len(p.Network.IP) {
+	switch len(a.Network.IP) {
 	case net.IPv4len:
 		sb.WriteByte('1')
 	case net.IPv6len:
@@ -1402,20 +1428,20 @@ func (p *APLPrefix) str() string {
 
 	sb.WriteByte(':')
 
-	switch len(p.Network.IP) {
+	switch len(a.Network.IP) {
 	case net.IPv4len:
-		sb.WriteString(p.Network.IP.String())
+		sb.WriteString(a.Network.IP.String())
 	case net.IPv6len:
 		// add prefix for IPv4-mapped IPv6
-		if v4 := p.Network.IP.To4(); v4 != nil {
+		if v4 := a.Network.IP.To4(); v4 != nil {
 			sb.WriteString("::ffff:")
 		}
-		sb.WriteString(p.Network.IP.String())
+		sb.WriteString(a.Network.IP.String())
 	}
 
 	sb.WriteByte('/')
 
-	prefix, _ := p.Network.Mask.Size()
+	prefix, _ := a.Network.Mask.Size()
 	sb.WriteString(strconv.Itoa(prefix))
 
 	return sb.String()
@@ -1429,17 +1455,17 @@ func (a *APLPrefix) equals(b *APLPrefix) bool {
 }
 
 // copy returns a copy of the APL prefix.
-func (p *APLPrefix) copy() APLPrefix {
+func (a *APLPrefix) copy() APLPrefix {
 	return APLPrefix{
-		Negation: p.Negation,
-		Network:  copyNet(p.Network),
+		Negation: a.Negation,
+		Network:  copyNet(a.Network),
 	}
 }
 
 // len returns size of the prefix in wire format.
-func (p *APLPrefix) len() int {
+func (a *APLPrefix) len() int {
 	// 4-byte header and the network address prefix (see Section 4 of RFC 3123)
-	prefix, _ := p.Network.Mask.Size()
+	prefix, _ := a.Network.Mask.Size()
 	return 4 + (prefix+7)/8
 }
 
@@ -1472,7 +1498,7 @@ func StringToTime(s string) (uint32, error) {
 
 // saltToString converts a NSECX salt to uppercase and returns "-" when it is empty.
 func saltToString(s string) string {
-	if len(s) == 0 {
+	if s == "" {
 		return "-"
 	}
 	return strings.ToUpper(s)
diff --git a/vendor/github.com/miekg/dns/version.go b/vendor/github.com/miekg/dns/version.go
index 8f7cf768812809735c266db32bc529d1b46e707b..622c69a1b851f6aff34504a5673d7220a6a2dcca 100644
--- a/vendor/github.com/miekg/dns/version.go
+++ b/vendor/github.com/miekg/dns/version.go
@@ -3,7 +3,7 @@ package dns
 import "fmt"
 
 // Version is current version of this library.
-var Version = v{1, 1, 40}
+var Version = v{1, 1, 43}
 
 // v holds the version of this library.
 type v struct {
diff --git a/vendor/github.com/miekg/dns/zduplicate.go b/vendor/github.com/miekg/dns/zduplicate.go
index 0d3b34bd9b24f722de92f3551512670d605f70ff..9eb1dac299b4e49e0bd332ea58aa136aa3bf4996 100644
--- a/vendor/github.com/miekg/dns/zduplicate.go
+++ b/vendor/github.com/miekg/dns/zduplicate.go
@@ -1317,3 +1317,24 @@ func (r1 *X25) isDuplicate(_r2 RR) bool {
 	}
 	return true
 }
+
+func (r1 *ZONEMD) isDuplicate(_r2 RR) bool {
+	r2, ok := _r2.(*ZONEMD)
+	if !ok {
+		return false
+	}
+	_ = r2
+	if r1.Serial != r2.Serial {
+		return false
+	}
+	if r1.Scheme != r2.Scheme {
+		return false
+	}
+	if r1.Hash != r2.Hash {
+		return false
+	}
+	if r1.Digest != r2.Digest {
+		return false
+	}
+	return true
+}
diff --git a/vendor/github.com/miekg/dns/zmsg.go b/vendor/github.com/miekg/dns/zmsg.go
index d24a10fa24267e1ee51f0d7d5b3a1b51ea0cf33b..fc0822f982180c44edf15ff75b4806884c69862d 100644
--- a/vendor/github.com/miekg/dns/zmsg.go
+++ b/vendor/github.com/miekg/dns/zmsg.go
@@ -1118,6 +1118,26 @@ func (rr *X25) pack(msg []byte, off int, compression compressionMap, compress bo
 	return off, nil
 }
 
+func (rr *ZONEMD) pack(msg []byte, off int, compression compressionMap, compress bool) (off1 int, err error) {
+	off, err = packUint32(rr.Serial, msg, off)
+	if err != nil {
+		return off, err
+	}
+	off, err = packUint8(rr.Scheme, msg, off)
+	if err != nil {
+		return off, err
+	}
+	off, err = packUint8(rr.Hash, msg, off)
+	if err != nil {
+		return off, err
+	}
+	off, err = packStringHex(rr.Digest, msg, off)
+	if err != nil {
+		return off, err
+	}
+	return off, nil
+}
+
 // unpack*() functions
 
 func (rr *A) unpack(msg []byte, off int) (off1 int, err error) {
@@ -2821,3 +2841,35 @@ func (rr *X25) unpack(msg []byte, off int) (off1 int, err error) {
 	}
 	return off, nil
 }
+
+func (rr *ZONEMD) unpack(msg []byte, off int) (off1 int, err error) {
+	rdStart := off
+	_ = rdStart
+
+	rr.Serial, off, err = unpackUint32(msg, off)
+	if err != nil {
+		return off, err
+	}
+	if off == len(msg) {
+		return off, nil
+	}
+	rr.Scheme, off, err = unpackUint8(msg, off)
+	if err != nil {
+		return off, err
+	}
+	if off == len(msg) {
+		return off, nil
+	}
+	rr.Hash, off, err = unpackUint8(msg, off)
+	if err != nil {
+		return off, err
+	}
+	if off == len(msg) {
+		return off, nil
+	}
+	rr.Digest, off, err = unpackStringHex(msg, off, rdStart+int(rr.Hdr.Rdlength))
+	if err != nil {
+		return off, err
+	}
+	return off, nil
+}
diff --git a/vendor/github.com/miekg/dns/ztypes.go b/vendor/github.com/miekg/dns/ztypes.go
index 11b51bf217109ab16392b635c4aacfba50dddc39..5d060cfee17256fd854bc81b076c3b3a4231ee3b 100644
--- a/vendor/github.com/miekg/dns/ztypes.go
+++ b/vendor/github.com/miekg/dns/ztypes.go
@@ -82,6 +82,7 @@ var TypeToRR = map[uint16]func() RR{
 	TypeUINFO:      func() RR { return new(UINFO) },
 	TypeURI:        func() RR { return new(URI) },
 	TypeX25:        func() RR { return new(X25) },
+	TypeZONEMD:     func() RR { return new(ZONEMD) },
 }
 
 // TypeToString is a map of strings for each RR type.
@@ -168,6 +169,7 @@ var TypeToString = map[uint16]string{
 	TypeUNSPEC:     "UNSPEC",
 	TypeURI:        "URI",
 	TypeX25:        "X25",
+	TypeZONEMD:     "ZONEMD",
 	TypeNSAPPTR:    "NSAP-PTR",
 }
 
@@ -245,6 +247,7 @@ func (rr *UID) Header() *RR_Header        { return &rr.Hdr }
 func (rr *UINFO) Header() *RR_Header      { return &rr.Hdr }
 func (rr *URI) Header() *RR_Header        { return &rr.Hdr }
 func (rr *X25) Header() *RR_Header        { return &rr.Hdr }
+func (rr *ZONEMD) Header() *RR_Header     { return &rr.Hdr }
 
 // len() functions
 func (rr *A) len(off int, compression map[string]struct{}) int {
@@ -684,6 +687,14 @@ func (rr *X25) len(off int, compression map[string]struct{}) int {
 	l += len(rr.PSDNAddress) + 1
 	return l
 }
+func (rr *ZONEMD) len(off int, compression map[string]struct{}) int {
+	l := rr.Hdr.len(off, compression)
+	l += 4 // Serial
+	l++    // Scheme
+	l++    // Hash
+	l += len(rr.Digest) / 2
+	return l
+}
 
 // copy() functions
 func (rr *A) copy() RR {
@@ -936,3 +947,6 @@ func (rr *URI) copy() RR {
 func (rr *X25) copy() RR {
 	return &X25{rr.Hdr, rr.PSDNAddress}
 }
+func (rr *ZONEMD) copy() RR {
+	return &ZONEMD{rr.Hdr, rr.Serial, rr.Scheme, rr.Hash, rr.Digest}
+}
diff --git a/vendor/golang.org/x/crypto/ed25519/ed25519.go b/vendor/golang.org/x/crypto/ed25519/ed25519.go
deleted file mode 100644
index 71ad917dadd8dc6af16289290c37878a84c242f8..0000000000000000000000000000000000000000
--- a/vendor/golang.org/x/crypto/ed25519/ed25519.go
+++ /dev/null
@@ -1,223 +0,0 @@
-// Copyright 2016 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// In Go 1.13, the ed25519 package was promoted to the standard library as
-// crypto/ed25519, and this package became a wrapper for the standard library one.
-//
-//go:build !go1.13
-// +build !go1.13
-
-// Package ed25519 implements the Ed25519 signature algorithm. See
-// https://ed25519.cr.yp.to/.
-//
-// These functions are also compatible with the “Ed25519” function defined in
-// RFC 8032. However, unlike RFC 8032's formulation, this package's private key
-// representation includes a public key suffix to make multiple signing
-// operations with the same key more efficient. This package refers to the RFC
-// 8032 private key as the “seed”.
-package ed25519
-
-// This code is a port of the public domain, “ref10” implementation of ed25519
-// from SUPERCOP.
-
-import (
-	"bytes"
-	"crypto"
-	cryptorand "crypto/rand"
-	"crypto/sha512"
-	"errors"
-	"io"
-	"strconv"
-
-	"golang.org/x/crypto/ed25519/internal/edwards25519"
-)
-
-const (
-	// PublicKeySize is the size, in bytes, of public keys as used in this package.
-	PublicKeySize = 32
-	// PrivateKeySize is the size, in bytes, of private keys as used in this package.
-	PrivateKeySize = 64
-	// SignatureSize is the size, in bytes, of signatures generated and verified by this package.
-	SignatureSize = 64
-	// SeedSize is the size, in bytes, of private key seeds. These are the private key representations used by RFC 8032.
-	SeedSize = 32
-)
-
-// PublicKey is the type of Ed25519 public keys.
-type PublicKey []byte
-
-// PrivateKey is the type of Ed25519 private keys. It implements crypto.Signer.
-type PrivateKey []byte
-
-// Public returns the PublicKey corresponding to priv.
-func (priv PrivateKey) Public() crypto.PublicKey {
-	publicKey := make([]byte, PublicKeySize)
-	copy(publicKey, priv[32:])
-	return PublicKey(publicKey)
-}
-
-// Seed returns the private key seed corresponding to priv. It is provided for
-// interoperability with RFC 8032. RFC 8032's private keys correspond to seeds
-// in this package.
-func (priv PrivateKey) Seed() []byte {
-	seed := make([]byte, SeedSize)
-	copy(seed, priv[:32])
-	return seed
-}
-
-// Sign signs the given message with priv.
-// Ed25519 performs two passes over messages to be signed and therefore cannot
-// handle pre-hashed messages. Thus opts.HashFunc() must return zero to
-// indicate the message hasn't been hashed. This can be achieved by passing
-// crypto.Hash(0) as the value for opts.
-func (priv PrivateKey) Sign(rand io.Reader, message []byte, opts crypto.SignerOpts) (signature []byte, err error) {
-	if opts.HashFunc() != crypto.Hash(0) {
-		return nil, errors.New("ed25519: cannot sign hashed message")
-	}
-
-	return Sign(priv, message), nil
-}
-
-// GenerateKey generates a public/private key pair using entropy from rand.
-// If rand is nil, crypto/rand.Reader will be used.
-func GenerateKey(rand io.Reader) (PublicKey, PrivateKey, error) {
-	if rand == nil {
-		rand = cryptorand.Reader
-	}
-
-	seed := make([]byte, SeedSize)
-	if _, err := io.ReadFull(rand, seed); err != nil {
-		return nil, nil, err
-	}
-
-	privateKey := NewKeyFromSeed(seed)
-	publicKey := make([]byte, PublicKeySize)
-	copy(publicKey, privateKey[32:])
-
-	return publicKey, privateKey, nil
-}
-
-// NewKeyFromSeed calculates a private key from a seed. It will panic if
-// len(seed) is not SeedSize. This function is provided for interoperability
-// with RFC 8032. RFC 8032's private keys correspond to seeds in this
-// package.
-func NewKeyFromSeed(seed []byte) PrivateKey {
-	if l := len(seed); l != SeedSize {
-		panic("ed25519: bad seed length: " + strconv.Itoa(l))
-	}
-
-	digest := sha512.Sum512(seed)
-	digest[0] &= 248
-	digest[31] &= 127
-	digest[31] |= 64
-
-	var A edwards25519.ExtendedGroupElement
-	var hBytes [32]byte
-	copy(hBytes[:], digest[:])
-	edwards25519.GeScalarMultBase(&A, &hBytes)
-	var publicKeyBytes [32]byte
-	A.ToBytes(&publicKeyBytes)
-
-	privateKey := make([]byte, PrivateKeySize)
-	copy(privateKey, seed)
-	copy(privateKey[32:], publicKeyBytes[:])
-
-	return privateKey
-}
-
-// Sign signs the message with privateKey and returns a signature. It will
-// panic if len(privateKey) is not PrivateKeySize.
-func Sign(privateKey PrivateKey, message []byte) []byte {
-	if l := len(privateKey); l != PrivateKeySize {
-		panic("ed25519: bad private key length: " + strconv.Itoa(l))
-	}
-
-	h := sha512.New()
-	h.Write(privateKey[:32])
-
-	var digest1, messageDigest, hramDigest [64]byte
-	var expandedSecretKey [32]byte
-	h.Sum(digest1[:0])
-	copy(expandedSecretKey[:], digest1[:])
-	expandedSecretKey[0] &= 248
-	expandedSecretKey[31] &= 63
-	expandedSecretKey[31] |= 64
-
-	h.Reset()
-	h.Write(digest1[32:])
-	h.Write(message)
-	h.Sum(messageDigest[:0])
-
-	var messageDigestReduced [32]byte
-	edwards25519.ScReduce(&messageDigestReduced, &messageDigest)
-	var R edwards25519.ExtendedGroupElement
-	edwards25519.GeScalarMultBase(&R, &messageDigestReduced)
-
-	var encodedR [32]byte
-	R.ToBytes(&encodedR)
-
-	h.Reset()
-	h.Write(encodedR[:])
-	h.Write(privateKey[32:])
-	h.Write(message)
-	h.Sum(hramDigest[:0])
-	var hramDigestReduced [32]byte
-	edwards25519.ScReduce(&hramDigestReduced, &hramDigest)
-
-	var s [32]byte
-	edwards25519.ScMulAdd(&s, &hramDigestReduced, &expandedSecretKey, &messageDigestReduced)
-
-	signature := make([]byte, SignatureSize)
-	copy(signature[:], encodedR[:])
-	copy(signature[32:], s[:])
-
-	return signature
-}
-
-// Verify reports whether sig is a valid signature of message by publicKey. It
-// will panic if len(publicKey) is not PublicKeySize.
-func Verify(publicKey PublicKey, message, sig []byte) bool {
-	if l := len(publicKey); l != PublicKeySize {
-		panic("ed25519: bad public key length: " + strconv.Itoa(l))
-	}
-
-	if len(sig) != SignatureSize || sig[63]&224 != 0 {
-		return false
-	}
-
-	var A edwards25519.ExtendedGroupElement
-	var publicKeyBytes [32]byte
-	copy(publicKeyBytes[:], publicKey)
-	if !A.FromBytes(&publicKeyBytes) {
-		return false
-	}
-	edwards25519.FeNeg(&A.X, &A.X)
-	edwards25519.FeNeg(&A.T, &A.T)
-
-	h := sha512.New()
-	h.Write(sig[:32])
-	h.Write(publicKey[:])
-	h.Write(message)
-	var digest [64]byte
-	h.Sum(digest[:0])
-
-	var hReduced [32]byte
-	edwards25519.ScReduce(&hReduced, &digest)
-
-	var R edwards25519.ProjectiveGroupElement
-	var s [32]byte
-	copy(s[:], sig[32:])
-
-	// https://tools.ietf.org/html/rfc8032#section-5.1.7 requires that s be in
-	// the range [0, order) in order to prevent signature malleability.
-	if !edwards25519.ScMinimal(&s) {
-		return false
-	}
-
-	edwards25519.GeDoubleScalarMultVartime(&R, &hReduced, &A, &s)
-
-	var checkR [32]byte
-	R.ToBytes(&checkR)
-	return bytes.Equal(sig[:32], checkR[:])
-}
diff --git a/vendor/golang.org/x/crypto/ed25519/ed25519_go113.go b/vendor/golang.org/x/crypto/ed25519/ed25519_go113.go
deleted file mode 100644
index b5974dc8b27bb23f1f7d0771f024d8bc1486292a..0000000000000000000000000000000000000000
--- a/vendor/golang.org/x/crypto/ed25519/ed25519_go113.go
+++ /dev/null
@@ -1,74 +0,0 @@
-// Copyright 2019 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-//go:build go1.13
-// +build go1.13
-
-// Package ed25519 implements the Ed25519 signature algorithm. See
-// https://ed25519.cr.yp.to/.
-//
-// These functions are also compatible with the “Ed25519” function defined in
-// RFC 8032. However, unlike RFC 8032's formulation, this package's private key
-// representation includes a public key suffix to make multiple signing
-// operations with the same key more efficient. This package refers to the RFC
-// 8032 private key as the “seed”.
-//
-// Beginning with Go 1.13, the functionality of this package was moved to the
-// standard library as crypto/ed25519. This package only acts as a compatibility
-// wrapper.
-package ed25519
-
-import (
-	"crypto/ed25519"
-	"io"
-)
-
-const (
-	// PublicKeySize is the size, in bytes, of public keys as used in this package.
-	PublicKeySize = 32
-	// PrivateKeySize is the size, in bytes, of private keys as used in this package.
-	PrivateKeySize = 64
-	// SignatureSize is the size, in bytes, of signatures generated and verified by this package.
-	SignatureSize = 64
-	// SeedSize is the size, in bytes, of private key seeds. These are the private key representations used by RFC 8032.
-	SeedSize = 32
-)
-
-// PublicKey is the type of Ed25519 public keys.
-//
-// This type is an alias for crypto/ed25519's PublicKey type.
-// See the crypto/ed25519 package for the methods on this type.
-type PublicKey = ed25519.PublicKey
-
-// PrivateKey is the type of Ed25519 private keys. It implements crypto.Signer.
-//
-// This type is an alias for crypto/ed25519's PrivateKey type.
-// See the crypto/ed25519 package for the methods on this type.
-type PrivateKey = ed25519.PrivateKey
-
-// GenerateKey generates a public/private key pair using entropy from rand.
-// If rand is nil, crypto/rand.Reader will be used.
-func GenerateKey(rand io.Reader) (PublicKey, PrivateKey, error) {
-	return ed25519.GenerateKey(rand)
-}
-
-// NewKeyFromSeed calculates a private key from a seed. It will panic if
-// len(seed) is not SeedSize. This function is provided for interoperability
-// with RFC 8032. RFC 8032's private keys correspond to seeds in this
-// package.
-func NewKeyFromSeed(seed []byte) PrivateKey {
-	return ed25519.NewKeyFromSeed(seed)
-}
-
-// Sign signs the message with privateKey and returns a signature. It will
-// panic if len(privateKey) is not PrivateKeySize.
-func Sign(privateKey PrivateKey, message []byte) []byte {
-	return ed25519.Sign(privateKey, message)
-}
-
-// Verify reports whether sig is a valid signature of message by publicKey. It
-// will panic if len(publicKey) is not PublicKeySize.
-func Verify(publicKey PublicKey, message, sig []byte) bool {
-	return ed25519.Verify(publicKey, message, sig)
-}
diff --git a/vendor/golang.org/x/crypto/ed25519/internal/edwards25519/const.go b/vendor/golang.org/x/crypto/ed25519/internal/edwards25519/const.go
deleted file mode 100644
index e39f086c1d87dbedcb0cd0ccb4d302bae2c04dbc..0000000000000000000000000000000000000000
--- a/vendor/golang.org/x/crypto/ed25519/internal/edwards25519/const.go
+++ /dev/null
@@ -1,1422 +0,0 @@
-// Copyright 2016 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package edwards25519
-
-// These values are from the public domain, “ref10” implementation of ed25519
-// from SUPERCOP.
-
-// d is a constant in the Edwards curve equation.
-var d = FieldElement{
-	-10913610, 13857413, -15372611, 6949391, 114729, -8787816, -6275908, -3247719, -18696448, -12055116,
-}
-
-// d2 is 2*d.
-var d2 = FieldElement{
-	-21827239, -5839606, -30745221, 13898782, 229458, 15978800, -12551817, -6495438, 29715968, 9444199,
-}
-
-// SqrtM1 is the square-root of -1 in the field.
-var SqrtM1 = FieldElement{
-	-32595792, -7943725, 9377950, 3500415, 12389472, -272473, -25146209, -2005654, 326686, 11406482,
-}
-
-// A is a constant in the Montgomery-form of curve25519.
-var A = FieldElement{
-	486662, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-}
-
-// bi contains precomputed multiples of the base-point. See the Ed25519 paper
-// for a discussion about how these values are used.
-var bi = [8]PreComputedGroupElement{
-	{
-		FieldElement{25967493, -14356035, 29566456, 3660896, -12694345, 4014787, 27544626, -11754271, -6079156, 2047605},
-		FieldElement{-12545711, 934262, -2722910, 3049990, -727428, 9406986, 12720692, 5043384, 19500929, -15469378},
-		FieldElement{-8738181, 4489570, 9688441, -14785194, 10184609, -12363380, 29287919, 11864899, -24514362, -4438546},
-	},
-	{
-		FieldElement{15636291, -9688557, 24204773, -7912398, 616977, -16685262, 27787600, -14772189, 28944400, -1550024},
-		FieldElement{16568933, 4717097, -11556148, -1102322, 15682896, -11807043, 16354577, -11775962, 7689662, 11199574},
-		FieldElement{30464156, -5976125, -11779434, -15670865, 23220365, 15915852, 7512774, 10017326, -17749093, -9920357},
-	},
-	{
-		FieldElement{10861363, 11473154, 27284546, 1981175, -30064349, 12577861, 32867885, 14515107, -15438304, 10819380},
-		FieldElement{4708026, 6336745, 20377586, 9066809, -11272109, 6594696, -25653668, 12483688, -12668491, 5581306},
-		FieldElement{19563160, 16186464, -29386857, 4097519, 10237984, -4348115, 28542350, 13850243, -23678021, -15815942},
-	},
-	{
-		FieldElement{5153746, 9909285, 1723747, -2777874, 30523605, 5516873, 19480852, 5230134, -23952439, -15175766},
-		FieldElement{-30269007, -3463509, 7665486, 10083793, 28475525, 1649722, 20654025, 16520125, 30598449, 7715701},
-		FieldElement{28881845, 14381568, 9657904, 3680757, -20181635, 7843316, -31400660, 1370708, 29794553, -1409300},
-	},
-	{
-		FieldElement{-22518993, -6692182, 14201702, -8745502, -23510406, 8844726, 18474211, -1361450, -13062696, 13821877},
-		FieldElement{-6455177, -7839871, 3374702, -4740862, -27098617, -10571707, 31655028, -7212327, 18853322, -14220951},
-		FieldElement{4566830, -12963868, -28974889, -12240689, -7602672, -2830569, -8514358, -10431137, 2207753, -3209784},
-	},
-	{
-		FieldElement{-25154831, -4185821, 29681144, 7868801, -6854661, -9423865, -12437364, -663000, -31111463, -16132436},
-		FieldElement{25576264, -2703214, 7349804, -11814844, 16472782, 9300885, 3844789, 15725684, 171356, 6466918},
-		FieldElement{23103977, 13316479, 9739013, -16149481, 817875, -15038942, 8965339, -14088058, -30714912, 16193877},
-	},
-	{
-		FieldElement{-33521811, 3180713, -2394130, 14003687, -16903474, -16270840, 17238398, 4729455, -18074513, 9256800},
-		FieldElement{-25182317, -4174131, 32336398, 5036987, -21236817, 11360617, 22616405, 9761698, -19827198, 630305},
-		FieldElement{-13720693, 2639453, -24237460, -7406481, 9494427, -5774029, -6554551, -15960994, -2449256, -14291300},
-	},
-	{
-		FieldElement{-3151181, -5046075, 9282714, 6866145, -31907062, -863023, -18940575, 15033784, 25105118, -7894876},
-		FieldElement{-24326370, 15950226, -31801215, -14592823, -11662737, -5090925, 1573892, -2625887, 2198790, -15804619},
-		FieldElement{-3099351, 10324967, -2241613, 7453183, -5446979, -2735503, -13812022, -16236442, -32461234, -12290683},
-	},
-}
-
-// base contains precomputed multiples of the base-point. See the Ed25519 paper
-// for a discussion about how these values are used.
-var base = [32][8]PreComputedGroupElement{
-	{
-		{
-			FieldElement{25967493, -14356035, 29566456, 3660896, -12694345, 4014787, 27544626, -11754271, -6079156, 2047605},
-			FieldElement{-12545711, 934262, -2722910, 3049990, -727428, 9406986, 12720692, 5043384, 19500929, -15469378},
-			FieldElement{-8738181, 4489570, 9688441, -14785194, 10184609, -12363380, 29287919, 11864899, -24514362, -4438546},
-		},
-		{
-			FieldElement{-12815894, -12976347, -21581243, 11784320, -25355658, -2750717, -11717903, -3814571, -358445, -10211303},
-			FieldElement{-21703237, 6903825, 27185491, 6451973, -29577724, -9554005, -15616551, 11189268, -26829678, -5319081},
-			FieldElement{26966642, 11152617, 32442495, 15396054, 14353839, -12752335, -3128826, -9541118, -15472047, -4166697},
-		},
-		{
-			FieldElement{15636291, -9688557, 24204773, -7912398, 616977, -16685262, 27787600, -14772189, 28944400, -1550024},
-			FieldElement{16568933, 4717097, -11556148, -1102322, 15682896, -11807043, 16354577, -11775962, 7689662, 11199574},
-			FieldElement{30464156, -5976125, -11779434, -15670865, 23220365, 15915852, 7512774, 10017326, -17749093, -9920357},
-		},
-		{
-			FieldElement{-17036878, 13921892, 10945806, -6033431, 27105052, -16084379, -28926210, 15006023, 3284568, -6276540},
-			FieldElement{23599295, -8306047, -11193664, -7687416, 13236774, 10506355, 7464579, 9656445, 13059162, 10374397},
-			FieldElement{7798556, 16710257, 3033922, 2874086, 28997861, 2835604, 32406664, -3839045, -641708, -101325},
-		},
-		{
-			FieldElement{10861363, 11473154, 27284546, 1981175, -30064349, 12577861, 32867885, 14515107, -15438304, 10819380},
-			FieldElement{4708026, 6336745, 20377586, 9066809, -11272109, 6594696, -25653668, 12483688, -12668491, 5581306},
-			FieldElement{19563160, 16186464, -29386857, 4097519, 10237984, -4348115, 28542350, 13850243, -23678021, -15815942},
-		},
-		{
-			FieldElement{-15371964, -12862754, 32573250, 4720197, -26436522, 5875511, -19188627, -15224819, -9818940, -12085777},
-			FieldElement{-8549212, 109983, 15149363, 2178705, 22900618, 4543417, 3044240, -15689887, 1762328, 14866737},
-			FieldElement{-18199695, -15951423, -10473290, 1707278, -17185920, 3916101, -28236412, 3959421, 27914454, 4383652},
-		},
-		{
-			FieldElement{5153746, 9909285, 1723747, -2777874, 30523605, 5516873, 19480852, 5230134, -23952439, -15175766},
-			FieldElement{-30269007, -3463509, 7665486, 10083793, 28475525, 1649722, 20654025, 16520125, 30598449, 7715701},
-			FieldElement{28881845, 14381568, 9657904, 3680757, -20181635, 7843316, -31400660, 1370708, 29794553, -1409300},
-		},
-		{
-			FieldElement{14499471, -2729599, -33191113, -4254652, 28494862, 14271267, 30290735, 10876454, -33154098, 2381726},
-			FieldElement{-7195431, -2655363, -14730155, 462251, -27724326, 3941372, -6236617, 3696005, -32300832, 15351955},
-			FieldElement{27431194, 8222322, 16448760, -3907995, -18707002, 11938355, -32961401, -2970515, 29551813, 10109425},
-		},
-	},
-	{
-		{
-			FieldElement{-13657040, -13155431, -31283750, 11777098, 21447386, 6519384, -2378284, -1627556, 10092783, -4764171},
-			FieldElement{27939166, 14210322, 4677035, 16277044, -22964462, -12398139, -32508754, 12005538, -17810127, 12803510},
-			FieldElement{17228999, -15661624, -1233527, 300140, -1224870, -11714777, 30364213, -9038194, 18016357, 4397660},
-		},
-		{
-			FieldElement{-10958843, -7690207, 4776341, -14954238, 27850028, -15602212, -26619106, 14544525, -17477504, 982639},
-			FieldElement{29253598, 15796703, -2863982, -9908884, 10057023, 3163536, 7332899, -4120128, -21047696, 9934963},
-			FieldElement{5793303, 16271923, -24131614, -10116404, 29188560, 1206517, -14747930, 4559895, -30123922, -10897950},
-		},
-		{
-			FieldElement{-27643952, -11493006, 16282657, -11036493, 28414021, -15012264, 24191034, 4541697, -13338309, 5500568},
-			FieldElement{12650548, -1497113, 9052871, 11355358, -17680037, -8400164, -17430592, 12264343, 10874051, 13524335},
-			FieldElement{25556948, -3045990, 714651, 2510400, 23394682, -10415330, 33119038, 5080568, -22528059, 5376628},
-		},
-		{
-			FieldElement{-26088264, -4011052, -17013699, -3537628, -6726793, 1920897, -22321305, -9447443, 4535768, 1569007},
-			FieldElement{-2255422, 14606630, -21692440, -8039818, 28430649, 8775819, -30494562, 3044290, 31848280, 12543772},
-			FieldElement{-22028579, 2943893, -31857513, 6777306, 13784462, -4292203, -27377195, -2062731, 7718482, 14474653},
-		},
-		{
-			FieldElement{2385315, 2454213, -22631320, 46603, -4437935, -15680415, 656965, -7236665, 24316168, -5253567},
-			FieldElement{13741529, 10911568, -33233417, -8603737, -20177830, -1033297, 33040651, -13424532, -20729456, 8321686},
-			FieldElement{21060490, -2212744, 15712757, -4336099, 1639040, 10656336, 23845965, -11874838, -9984458, 608372},
-		},
-		{
-			FieldElement{-13672732, -15087586, -10889693, -7557059, -6036909, 11305547, 1123968, -6780577, 27229399, 23887},
-			FieldElement{-23244140, -294205, -11744728, 14712571, -29465699, -2029617, 12797024, -6440308, -1633405, 16678954},
-			FieldElement{-29500620, 4770662, -16054387, 14001338, 7830047, 9564805, -1508144, -4795045, -17169265, 4904953},
-		},
-		{
-			FieldElement{24059557, 14617003, 19037157, -15039908, 19766093, -14906429, 5169211, 16191880, 2128236, -4326833},
-			FieldElement{-16981152, 4124966, -8540610, -10653797, 30336522, -14105247, -29806336, 916033, -6882542, -2986532},
-			FieldElement{-22630907, 12419372, -7134229, -7473371, -16478904, 16739175, 285431, 2763829, 15736322, 4143876},
-		},
-		{
-			FieldElement{2379352, 11839345, -4110402, -5988665, 11274298, 794957, 212801, -14594663, 23527084, -16458268},
-			FieldElement{33431127, -11130478, -17838966, -15626900, 8909499, 8376530, -32625340, 4087881, -15188911, -14416214},
-			FieldElement{1767683, 7197987, -13205226, -2022635, -13091350, 448826, 5799055, 4357868, -4774191, -16323038},
-		},
-	},
-	{
-		{
-			FieldElement{6721966, 13833823, -23523388, -1551314, 26354293, -11863321, 23365147, -3949732, 7390890, 2759800},
-			FieldElement{4409041, 2052381, 23373853, 10530217, 7676779, -12885954, 21302353, -4264057, 1244380, -12919645},
-			FieldElement{-4421239, 7169619, 4982368, -2957590, 30256825, -2777540, 14086413, 9208236, 15886429, 16489664},
-		},
-		{
-			FieldElement{1996075, 10375649, 14346367, 13311202, -6874135, -16438411, -13693198, 398369, -30606455, -712933},
-			FieldElement{-25307465, 9795880, -2777414, 14878809, -33531835, 14780363, 13348553, 12076947, -30836462, 5113182},
-			FieldElement{-17770784, 11797796, 31950843, 13929123, -25888302, 12288344, -30341101, -7336386, 13847711, 5387222},
-		},
-		{
-			FieldElement{-18582163, -3416217, 17824843, -2340966, 22744343, -10442611, 8763061, 3617786, -19600662, 10370991},
-			FieldElement{20246567, -14369378, 22358229, -543712, 18507283, -10413996, 14554437, -8746092, 32232924, 16763880},
-			FieldElement{9648505, 10094563, 26416693, 14745928, -30374318, -6472621, 11094161, 15689506, 3140038, -16510092},
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-			FieldElement{29262576, 16756590, 26350592, -8793563, 8529671, -11208050, 13617293, -9937143, 11465739, 8317062},
-		},
-		{
-			FieldElement{-25493081, -6962928, 32500200, -9419051, -23038724, -2302222, 14898637, 3848455, 20969334, -5157516},
-			FieldElement{-20384450, -14347713, -18336405, 13884722, -33039454, 2842114, -21610826, -3649888, 11177095, 14989547},
-			FieldElement{-24496721, -11716016, 16959896, 2278463, 12066309, 10137771, 13515641, 2581286, -28487508, 9930240},
-		},
-		{
-			FieldElement{-17751622, -2097826, 16544300, -13009300, -15914807, -14949081, 18345767, -13403753, 16291481, -5314038},
-			FieldElement{-33229194, 2553288, 32678213, 9875984, 8534129, 6889387, -9676774, 6957617, 4368891, 9788741},
-			FieldElement{16660756, 7281060, -10830758, 12911820, 20108584, -8101676, -21722536, -8613148, 16250552, -11111103},
-		},
-		{
-			FieldElement{-19765507, 2390526, -16551031, 14161980, 1905286, 6414907, 4689584, 10604807, -30190403, 4782747},
-			FieldElement{-1354539, 14736941, -7367442, -13292886, 7710542, -14155590, -9981571, 4383045, 22546403, 437323},
-			FieldElement{31665577, -12180464, -16186830, 1491339, -18368625, 3294682, 27343084, 2786261, -30633590, -14097016},
-		},
-		{
-			FieldElement{-14467279, -683715, -33374107, 7448552, 19294360, 14334329, -19690631, 2355319, -19284671, -6114373},
-			FieldElement{15121312, -15796162, 6377020, -6031361, -10798111, -12957845, 18952177, 15496498, -29380133, 11754228},
-			FieldElement{-2637277, -13483075, 8488727, -14303896, 12728761, -1622493, 7141596, 11724556, 22761615, -10134141},
-		},
-		{
-			FieldElement{16918416, 11729663, -18083579, 3022987, -31015732, -13339659, -28741185, -12227393, 32851222, 11717399},
-			FieldElement{11166634, 7338049, -6722523, 4531520, -29468672, -7302055, 31474879, 3483633, -1193175, -4030831},
-			FieldElement{-185635, 9921305, 31456609, -13536438, -12013818, 13348923, 33142652, 6546660, -19985279, -3948376},
-		},
-		{
-			FieldElement{-32460596, 11266712, -11197107, -7899103, 31703694, 3855903, -8537131, -12833048, -30772034, -15486313},
-			FieldElement{-18006477, 12709068, 3991746, -6479188, -21491523, -10550425, -31135347, -16049879, 10928917, 3011958},
-			FieldElement{-6957757, -15594337, 31696059, 334240, 29576716, 14796075, -30831056, -12805180, 18008031, 10258577},
-		},
-		{
-			FieldElement{-22448644, 15655569, 7018479, -4410003, -30314266, -1201591, -1853465, 1367120, 25127874, 6671743},
-			FieldElement{29701166, -14373934, -10878120, 9279288, -17568, 13127210, 21382910, 11042292, 25838796, 4642684},
-			FieldElement{-20430234, 14955537, -24126347, 8124619, -5369288, -5990470, 30468147, -13900640, 18423289, 4177476},
-		},
-	},
-}
diff --git a/vendor/golang.org/x/crypto/ed25519/internal/edwards25519/edwards25519.go b/vendor/golang.org/x/crypto/ed25519/internal/edwards25519/edwards25519.go
deleted file mode 100644
index fd03c252af427bd27eda3a787c6062b949c65d5f..0000000000000000000000000000000000000000
--- a/vendor/golang.org/x/crypto/ed25519/internal/edwards25519/edwards25519.go
+++ /dev/null
@@ -1,1793 +0,0 @@
-// Copyright 2016 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package edwards25519
-
-import "encoding/binary"
-
-// This code is a port of the public domain, “ref10” implementation of ed25519
-// from SUPERCOP.
-
-// FieldElement represents an element of the field GF(2^255 - 19).  An element
-// t, entries t[0]...t[9], represents the integer t[0]+2^26 t[1]+2^51 t[2]+2^77
-// t[3]+2^102 t[4]+...+2^230 t[9].  Bounds on each t[i] vary depending on
-// context.
-type FieldElement [10]int32
-
-var zero FieldElement
-
-func FeZero(fe *FieldElement) {
-	copy(fe[:], zero[:])
-}
-
-func FeOne(fe *FieldElement) {
-	FeZero(fe)
-	fe[0] = 1
-}
-
-func FeAdd(dst, a, b *FieldElement) {
-	dst[0] = a[0] + b[0]
-	dst[1] = a[1] + b[1]
-	dst[2] = a[2] + b[2]
-	dst[3] = a[3] + b[3]
-	dst[4] = a[4] + b[4]
-	dst[5] = a[5] + b[5]
-	dst[6] = a[6] + b[6]
-	dst[7] = a[7] + b[7]
-	dst[8] = a[8] + b[8]
-	dst[9] = a[9] + b[9]
-}
-
-func FeSub(dst, a, b *FieldElement) {
-	dst[0] = a[0] - b[0]
-	dst[1] = a[1] - b[1]
-	dst[2] = a[2] - b[2]
-	dst[3] = a[3] - b[3]
-	dst[4] = a[4] - b[4]
-	dst[5] = a[5] - b[5]
-	dst[6] = a[6] - b[6]
-	dst[7] = a[7] - b[7]
-	dst[8] = a[8] - b[8]
-	dst[9] = a[9] - b[9]
-}
-
-func FeCopy(dst, src *FieldElement) {
-	copy(dst[:], src[:])
-}
-
-// Replace (f,g) with (g,g) if b == 1;
-// replace (f,g) with (f,g) if b == 0.
-//
-// Preconditions: b in {0,1}.
-func FeCMove(f, g *FieldElement, b int32) {
-	b = -b
-	f[0] ^= b & (f[0] ^ g[0])
-	f[1] ^= b & (f[1] ^ g[1])
-	f[2] ^= b & (f[2] ^ g[2])
-	f[3] ^= b & (f[3] ^ g[3])
-	f[4] ^= b & (f[4] ^ g[4])
-	f[5] ^= b & (f[5] ^ g[5])
-	f[6] ^= b & (f[6] ^ g[6])
-	f[7] ^= b & (f[7] ^ g[7])
-	f[8] ^= b & (f[8] ^ g[8])
-	f[9] ^= b & (f[9] ^ g[9])
-}
-
-func load3(in []byte) int64 {
-	var r int64
-	r = int64(in[0])
-	r |= int64(in[1]) << 8
-	r |= int64(in[2]) << 16
-	return r
-}
-
-func load4(in []byte) int64 {
-	var r int64
-	r = int64(in[0])
-	r |= int64(in[1]) << 8
-	r |= int64(in[2]) << 16
-	r |= int64(in[3]) << 24
-	return r
-}
-
-func FeFromBytes(dst *FieldElement, src *[32]byte) {
-	h0 := load4(src[:])
-	h1 := load3(src[4:]) << 6
-	h2 := load3(src[7:]) << 5
-	h3 := load3(src[10:]) << 3
-	h4 := load3(src[13:]) << 2
-	h5 := load4(src[16:])
-	h6 := load3(src[20:]) << 7
-	h7 := load3(src[23:]) << 5
-	h8 := load3(src[26:]) << 4
-	h9 := (load3(src[29:]) & 8388607) << 2
-
-	FeCombine(dst, h0, h1, h2, h3, h4, h5, h6, h7, h8, h9)
-}
-
-// FeToBytes marshals h to s.
-// Preconditions:
-//   |h| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
-//
-// Write p=2^255-19; q=floor(h/p).
-// Basic claim: q = floor(2^(-255)(h + 19 2^(-25)h9 + 2^(-1))).
-//
-// Proof:
-//   Have |h|<=p so |q|<=1 so |19^2 2^(-255) q|<1/4.
-//   Also have |h-2^230 h9|<2^230 so |19 2^(-255)(h-2^230 h9)|<1/4.
-//
-//   Write y=2^(-1)-19^2 2^(-255)q-19 2^(-255)(h-2^230 h9).
-//   Then 0<y<1.
-//
-//   Write r=h-pq.
-//   Have 0<=r<=p-1=2^255-20.
-//   Thus 0<=r+19(2^-255)r<r+19(2^-255)2^255<=2^255-1.
-//
-//   Write x=r+19(2^-255)r+y.
-//   Then 0<x<2^255 so floor(2^(-255)x) = 0 so floor(q+2^(-255)x) = q.
-//
-//   Have q+2^(-255)x = 2^(-255)(h + 19 2^(-25) h9 + 2^(-1))
-//   so floor(2^(-255)(h + 19 2^(-25) h9 + 2^(-1))) = q.
-func FeToBytes(s *[32]byte, h *FieldElement) {
-	var carry [10]int32
-
-	q := (19*h[9] + (1 << 24)) >> 25
-	q = (h[0] + q) >> 26
-	q = (h[1] + q) >> 25
-	q = (h[2] + q) >> 26
-	q = (h[3] + q) >> 25
-	q = (h[4] + q) >> 26
-	q = (h[5] + q) >> 25
-	q = (h[6] + q) >> 26
-	q = (h[7] + q) >> 25
-	q = (h[8] + q) >> 26
-	q = (h[9] + q) >> 25
-
-	// Goal: Output h-(2^255-19)q, which is between 0 and 2^255-20.
-	h[0] += 19 * q
-	// Goal: Output h-2^255 q, which is between 0 and 2^255-20.
-
-	carry[0] = h[0] >> 26
-	h[1] += carry[0]
-	h[0] -= carry[0] << 26
-	carry[1] = h[1] >> 25
-	h[2] += carry[1]
-	h[1] -= carry[1] << 25
-	carry[2] = h[2] >> 26
-	h[3] += carry[2]
-	h[2] -= carry[2] << 26
-	carry[3] = h[3] >> 25
-	h[4] += carry[3]
-	h[3] -= carry[3] << 25
-	carry[4] = h[4] >> 26
-	h[5] += carry[4]
-	h[4] -= carry[4] << 26
-	carry[5] = h[5] >> 25
-	h[6] += carry[5]
-	h[5] -= carry[5] << 25
-	carry[6] = h[6] >> 26
-	h[7] += carry[6]
-	h[6] -= carry[6] << 26
-	carry[7] = h[7] >> 25
-	h[8] += carry[7]
-	h[7] -= carry[7] << 25
-	carry[8] = h[8] >> 26
-	h[9] += carry[8]
-	h[8] -= carry[8] << 26
-	carry[9] = h[9] >> 25
-	h[9] -= carry[9] << 25
-	// h10 = carry9
-
-	// Goal: Output h[0]+...+2^255 h10-2^255 q, which is between 0 and 2^255-20.
-	// Have h[0]+...+2^230 h[9] between 0 and 2^255-1;
-	// evidently 2^255 h10-2^255 q = 0.
-	// Goal: Output h[0]+...+2^230 h[9].
-
-	s[0] = byte(h[0] >> 0)
-	s[1] = byte(h[0] >> 8)
-	s[2] = byte(h[0] >> 16)
-	s[3] = byte((h[0] >> 24) | (h[1] << 2))
-	s[4] = byte(h[1] >> 6)
-	s[5] = byte(h[1] >> 14)
-	s[6] = byte((h[1] >> 22) | (h[2] << 3))
-	s[7] = byte(h[2] >> 5)
-	s[8] = byte(h[2] >> 13)
-	s[9] = byte((h[2] >> 21) | (h[3] << 5))
-	s[10] = byte(h[3] >> 3)
-	s[11] = byte(h[3] >> 11)
-	s[12] = byte((h[3] >> 19) | (h[4] << 6))
-	s[13] = byte(h[4] >> 2)
-	s[14] = byte(h[4] >> 10)
-	s[15] = byte(h[4] >> 18)
-	s[16] = byte(h[5] >> 0)
-	s[17] = byte(h[5] >> 8)
-	s[18] = byte(h[5] >> 16)
-	s[19] = byte((h[5] >> 24) | (h[6] << 1))
-	s[20] = byte(h[6] >> 7)
-	s[21] = byte(h[6] >> 15)
-	s[22] = byte((h[6] >> 23) | (h[7] << 3))
-	s[23] = byte(h[7] >> 5)
-	s[24] = byte(h[7] >> 13)
-	s[25] = byte((h[7] >> 21) | (h[8] << 4))
-	s[26] = byte(h[8] >> 4)
-	s[27] = byte(h[8] >> 12)
-	s[28] = byte((h[8] >> 20) | (h[9] << 6))
-	s[29] = byte(h[9] >> 2)
-	s[30] = byte(h[9] >> 10)
-	s[31] = byte(h[9] >> 18)
-}
-
-func FeIsNegative(f *FieldElement) byte {
-	var s [32]byte
-	FeToBytes(&s, f)
-	return s[0] & 1
-}
-
-func FeIsNonZero(f *FieldElement) int32 {
-	var s [32]byte
-	FeToBytes(&s, f)
-	var x uint8
-	for _, b := range s {
-		x |= b
-	}
-	x |= x >> 4
-	x |= x >> 2
-	x |= x >> 1
-	return int32(x & 1)
-}
-
-// FeNeg sets h = -f
-//
-// Preconditions:
-//    |f| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
-//
-// Postconditions:
-//    |h| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
-func FeNeg(h, f *FieldElement) {
-	h[0] = -f[0]
-	h[1] = -f[1]
-	h[2] = -f[2]
-	h[3] = -f[3]
-	h[4] = -f[4]
-	h[5] = -f[5]
-	h[6] = -f[6]
-	h[7] = -f[7]
-	h[8] = -f[8]
-	h[9] = -f[9]
-}
-
-func FeCombine(h *FieldElement, h0, h1, h2, h3, h4, h5, h6, h7, h8, h9 int64) {
-	var c0, c1, c2, c3, c4, c5, c6, c7, c8, c9 int64
-
-	/*
-	  |h0| <= (1.1*1.1*2^52*(1+19+19+19+19)+1.1*1.1*2^50*(38+38+38+38+38))
-	    i.e. |h0| <= 1.2*2^59; narrower ranges for h2, h4, h6, h8
-	  |h1| <= (1.1*1.1*2^51*(1+1+19+19+19+19+19+19+19+19))
-	    i.e. |h1| <= 1.5*2^58; narrower ranges for h3, h5, h7, h9
-	*/
-
-	c0 = (h0 + (1 << 25)) >> 26
-	h1 += c0
-	h0 -= c0 << 26
-	c4 = (h4 + (1 << 25)) >> 26
-	h5 += c4
-	h4 -= c4 << 26
-	/* |h0| <= 2^25 */
-	/* |h4| <= 2^25 */
-	/* |h1| <= 1.51*2^58 */
-	/* |h5| <= 1.51*2^58 */
-
-	c1 = (h1 + (1 << 24)) >> 25
-	h2 += c1
-	h1 -= c1 << 25
-	c5 = (h5 + (1 << 24)) >> 25
-	h6 += c5
-	h5 -= c5 << 25
-	/* |h1| <= 2^24; from now on fits into int32 */
-	/* |h5| <= 2^24; from now on fits into int32 */
-	/* |h2| <= 1.21*2^59 */
-	/* |h6| <= 1.21*2^59 */
-
-	c2 = (h2 + (1 << 25)) >> 26
-	h3 += c2
-	h2 -= c2 << 26
-	c6 = (h6 + (1 << 25)) >> 26
-	h7 += c6
-	h6 -= c6 << 26
-	/* |h2| <= 2^25; from now on fits into int32 unchanged */
-	/* |h6| <= 2^25; from now on fits into int32 unchanged */
-	/* |h3| <= 1.51*2^58 */
-	/* |h7| <= 1.51*2^58 */
-
-	c3 = (h3 + (1 << 24)) >> 25
-	h4 += c3
-	h3 -= c3 << 25
-	c7 = (h7 + (1 << 24)) >> 25
-	h8 += c7
-	h7 -= c7 << 25
-	/* |h3| <= 2^24; from now on fits into int32 unchanged */
-	/* |h7| <= 2^24; from now on fits into int32 unchanged */
-	/* |h4| <= 1.52*2^33 */
-	/* |h8| <= 1.52*2^33 */
-
-	c4 = (h4 + (1 << 25)) >> 26
-	h5 += c4
-	h4 -= c4 << 26
-	c8 = (h8 + (1 << 25)) >> 26
-	h9 += c8
-	h8 -= c8 << 26
-	/* |h4| <= 2^25; from now on fits into int32 unchanged */
-	/* |h8| <= 2^25; from now on fits into int32 unchanged */
-	/* |h5| <= 1.01*2^24 */
-	/* |h9| <= 1.51*2^58 */
-
-	c9 = (h9 + (1 << 24)) >> 25
-	h0 += c9 * 19
-	h9 -= c9 << 25
-	/* |h9| <= 2^24; from now on fits into int32 unchanged */
-	/* |h0| <= 1.8*2^37 */
-
-	c0 = (h0 + (1 << 25)) >> 26
-	h1 += c0
-	h0 -= c0 << 26
-	/* |h0| <= 2^25; from now on fits into int32 unchanged */
-	/* |h1| <= 1.01*2^24 */
-
-	h[0] = int32(h0)
-	h[1] = int32(h1)
-	h[2] = int32(h2)
-	h[3] = int32(h3)
-	h[4] = int32(h4)
-	h[5] = int32(h5)
-	h[6] = int32(h6)
-	h[7] = int32(h7)
-	h[8] = int32(h8)
-	h[9] = int32(h9)
-}
-
-// FeMul calculates h = f * g
-// Can overlap h with f or g.
-//
-// Preconditions:
-//    |f| bounded by 1.1*2^26,1.1*2^25,1.1*2^26,1.1*2^25,etc.
-//    |g| bounded by 1.1*2^26,1.1*2^25,1.1*2^26,1.1*2^25,etc.
-//
-// Postconditions:
-//    |h| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
-//
-// Notes on implementation strategy:
-//
-// Using schoolbook multiplication.
-// Karatsuba would save a little in some cost models.
-//
-// Most multiplications by 2 and 19 are 32-bit precomputations;
-// cheaper than 64-bit postcomputations.
-//
-// There is one remaining multiplication by 19 in the carry chain;
-// one *19 precomputation can be merged into this,
-// but the resulting data flow is considerably less clean.
-//
-// There are 12 carries below.
-// 10 of them are 2-way parallelizable and vectorizable.
-// Can get away with 11 carries, but then data flow is much deeper.
-//
-// With tighter constraints on inputs, can squeeze carries into int32.
-func FeMul(h, f, g *FieldElement) {
-	f0 := int64(f[0])
-	f1 := int64(f[1])
-	f2 := int64(f[2])
-	f3 := int64(f[3])
-	f4 := int64(f[4])
-	f5 := int64(f[5])
-	f6 := int64(f[6])
-	f7 := int64(f[7])
-	f8 := int64(f[8])
-	f9 := int64(f[9])
-
-	f1_2 := int64(2 * f[1])
-	f3_2 := int64(2 * f[3])
-	f5_2 := int64(2 * f[5])
-	f7_2 := int64(2 * f[7])
-	f9_2 := int64(2 * f[9])
-
-	g0 := int64(g[0])
-	g1 := int64(g[1])
-	g2 := int64(g[2])
-	g3 := int64(g[3])
-	g4 := int64(g[4])
-	g5 := int64(g[5])
-	g6 := int64(g[6])
-	g7 := int64(g[7])
-	g8 := int64(g[8])
-	g9 := int64(g[9])
-
-	g1_19 := int64(19 * g[1]) /* 1.4*2^29 */
-	g2_19 := int64(19 * g[2]) /* 1.4*2^30; still ok */
-	g3_19 := int64(19 * g[3])
-	g4_19 := int64(19 * g[4])
-	g5_19 := int64(19 * g[5])
-	g6_19 := int64(19 * g[6])
-	g7_19 := int64(19 * g[7])
-	g8_19 := int64(19 * g[8])
-	g9_19 := int64(19 * g[9])
-
-	h0 := f0*g0 + f1_2*g9_19 + f2*g8_19 + f3_2*g7_19 + f4*g6_19 + f5_2*g5_19 + f6*g4_19 + f7_2*g3_19 + f8*g2_19 + f9_2*g1_19
-	h1 := f0*g1 + f1*g0 + f2*g9_19 + f3*g8_19 + f4*g7_19 + f5*g6_19 + f6*g5_19 + f7*g4_19 + f8*g3_19 + f9*g2_19
-	h2 := f0*g2 + f1_2*g1 + f2*g0 + f3_2*g9_19 + f4*g8_19 + f5_2*g7_19 + f6*g6_19 + f7_2*g5_19 + f8*g4_19 + f9_2*g3_19
-	h3 := f0*g3 + f1*g2 + f2*g1 + f3*g0 + f4*g9_19 + f5*g8_19 + f6*g7_19 + f7*g6_19 + f8*g5_19 + f9*g4_19
-	h4 := f0*g4 + f1_2*g3 + f2*g2 + f3_2*g1 + f4*g0 + f5_2*g9_19 + f6*g8_19 + f7_2*g7_19 + f8*g6_19 + f9_2*g5_19
-	h5 := f0*g5 + f1*g4 + f2*g3 + f3*g2 + f4*g1 + f5*g0 + f6*g9_19 + f7*g8_19 + f8*g7_19 + f9*g6_19
-	h6 := f0*g6 + f1_2*g5 + f2*g4 + f3_2*g3 + f4*g2 + f5_2*g1 + f6*g0 + f7_2*g9_19 + f8*g8_19 + f9_2*g7_19
-	h7 := f0*g7 + f1*g6 + f2*g5 + f3*g4 + f4*g3 + f5*g2 + f6*g1 + f7*g0 + f8*g9_19 + f9*g8_19
-	h8 := f0*g8 + f1_2*g7 + f2*g6 + f3_2*g5 + f4*g4 + f5_2*g3 + f6*g2 + f7_2*g1 + f8*g0 + f9_2*g9_19
-	h9 := f0*g9 + f1*g8 + f2*g7 + f3*g6 + f4*g5 + f5*g4 + f6*g3 + f7*g2 + f8*g1 + f9*g0
-
-	FeCombine(h, h0, h1, h2, h3, h4, h5, h6, h7, h8, h9)
-}
-
-func feSquare(f *FieldElement) (h0, h1, h2, h3, h4, h5, h6, h7, h8, h9 int64) {
-	f0 := int64(f[0])
-	f1 := int64(f[1])
-	f2 := int64(f[2])
-	f3 := int64(f[3])
-	f4 := int64(f[4])
-	f5 := int64(f[5])
-	f6 := int64(f[6])
-	f7 := int64(f[7])
-	f8 := int64(f[8])
-	f9 := int64(f[9])
-	f0_2 := int64(2 * f[0])
-	f1_2 := int64(2 * f[1])
-	f2_2 := int64(2 * f[2])
-	f3_2 := int64(2 * f[3])
-	f4_2 := int64(2 * f[4])
-	f5_2 := int64(2 * f[5])
-	f6_2 := int64(2 * f[6])
-	f7_2 := int64(2 * f[7])
-	f5_38 := 38 * f5 // 1.31*2^30
-	f6_19 := 19 * f6 // 1.31*2^30
-	f7_38 := 38 * f7 // 1.31*2^30
-	f8_19 := 19 * f8 // 1.31*2^30
-	f9_38 := 38 * f9 // 1.31*2^30
-
-	h0 = f0*f0 + f1_2*f9_38 + f2_2*f8_19 + f3_2*f7_38 + f4_2*f6_19 + f5*f5_38
-	h1 = f0_2*f1 + f2*f9_38 + f3_2*f8_19 + f4*f7_38 + f5_2*f6_19
-	h2 = f0_2*f2 + f1_2*f1 + f3_2*f9_38 + f4_2*f8_19 + f5_2*f7_38 + f6*f6_19
-	h3 = f0_2*f3 + f1_2*f2 + f4*f9_38 + f5_2*f8_19 + f6*f7_38
-	h4 = f0_2*f4 + f1_2*f3_2 + f2*f2 + f5_2*f9_38 + f6_2*f8_19 + f7*f7_38
-	h5 = f0_2*f5 + f1_2*f4 + f2_2*f3 + f6*f9_38 + f7_2*f8_19
-	h6 = f0_2*f6 + f1_2*f5_2 + f2_2*f4 + f3_2*f3 + f7_2*f9_38 + f8*f8_19
-	h7 = f0_2*f7 + f1_2*f6 + f2_2*f5 + f3_2*f4 + f8*f9_38
-	h8 = f0_2*f8 + f1_2*f7_2 + f2_2*f6 + f3_2*f5_2 + f4*f4 + f9*f9_38
-	h9 = f0_2*f9 + f1_2*f8 + f2_2*f7 + f3_2*f6 + f4_2*f5
-
-	return
-}
-
-// FeSquare calculates h = f*f. Can overlap h with f.
-//
-// Preconditions:
-//    |f| bounded by 1.1*2^26,1.1*2^25,1.1*2^26,1.1*2^25,etc.
-//
-// Postconditions:
-//    |h| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
-func FeSquare(h, f *FieldElement) {
-	h0, h1, h2, h3, h4, h5, h6, h7, h8, h9 := feSquare(f)
-	FeCombine(h, h0, h1, h2, h3, h4, h5, h6, h7, h8, h9)
-}
-
-// FeSquare2 sets h = 2 * f * f
-//
-// Can overlap h with f.
-//
-// Preconditions:
-//    |f| bounded by 1.65*2^26,1.65*2^25,1.65*2^26,1.65*2^25,etc.
-//
-// Postconditions:
-//    |h| bounded by 1.01*2^25,1.01*2^24,1.01*2^25,1.01*2^24,etc.
-// See fe_mul.c for discussion of implementation strategy.
-func FeSquare2(h, f *FieldElement) {
-	h0, h1, h2, h3, h4, h5, h6, h7, h8, h9 := feSquare(f)
-
-	h0 += h0
-	h1 += h1
-	h2 += h2
-	h3 += h3
-	h4 += h4
-	h5 += h5
-	h6 += h6
-	h7 += h7
-	h8 += h8
-	h9 += h9
-
-	FeCombine(h, h0, h1, h2, h3, h4, h5, h6, h7, h8, h9)
-}
-
-func FeInvert(out, z *FieldElement) {
-	var t0, t1, t2, t3 FieldElement
-	var i int
-
-	FeSquare(&t0, z)        // 2^1
-	FeSquare(&t1, &t0)      // 2^2
-	for i = 1; i < 2; i++ { // 2^3
-		FeSquare(&t1, &t1)
-	}
-	FeMul(&t1, z, &t1)      // 2^3 + 2^0
-	FeMul(&t0, &t0, &t1)    // 2^3 + 2^1 + 2^0
-	FeSquare(&t2, &t0)      // 2^4 + 2^2 + 2^1
-	FeMul(&t1, &t1, &t2)    // 2^4 + 2^3 + 2^2 + 2^1 + 2^0
-	FeSquare(&t2, &t1)      // 5,4,3,2,1
-	for i = 1; i < 5; i++ { // 9,8,7,6,5
-		FeSquare(&t2, &t2)
-	}
-	FeMul(&t1, &t2, &t1)     // 9,8,7,6,5,4,3,2,1,0
-	FeSquare(&t2, &t1)       // 10..1
-	for i = 1; i < 10; i++ { // 19..10
-		FeSquare(&t2, &t2)
-	}
-	FeMul(&t2, &t2, &t1)     // 19..0
-	FeSquare(&t3, &t2)       // 20..1
-	for i = 1; i < 20; i++ { // 39..20
-		FeSquare(&t3, &t3)
-	}
-	FeMul(&t2, &t3, &t2)     // 39..0
-	FeSquare(&t2, &t2)       // 40..1
-	for i = 1; i < 10; i++ { // 49..10
-		FeSquare(&t2, &t2)
-	}
-	FeMul(&t1, &t2, &t1)     // 49..0
-	FeSquare(&t2, &t1)       // 50..1
-	for i = 1; i < 50; i++ { // 99..50
-		FeSquare(&t2, &t2)
-	}
-	FeMul(&t2, &t2, &t1)      // 99..0
-	FeSquare(&t3, &t2)        // 100..1
-	for i = 1; i < 100; i++ { // 199..100
-		FeSquare(&t3, &t3)
-	}
-	FeMul(&t2, &t3, &t2)     // 199..0
-	FeSquare(&t2, &t2)       // 200..1
-	for i = 1; i < 50; i++ { // 249..50
-		FeSquare(&t2, &t2)
-	}
-	FeMul(&t1, &t2, &t1)    // 249..0
-	FeSquare(&t1, &t1)      // 250..1
-	for i = 1; i < 5; i++ { // 254..5
-		FeSquare(&t1, &t1)
-	}
-	FeMul(out, &t1, &t0) // 254..5,3,1,0
-}
-
-func fePow22523(out, z *FieldElement) {
-	var t0, t1, t2 FieldElement
-	var i int
-
-	FeSquare(&t0, z)
-	for i = 1; i < 1; i++ {
-		FeSquare(&t0, &t0)
-	}
-	FeSquare(&t1, &t0)
-	for i = 1; i < 2; i++ {
-		FeSquare(&t1, &t1)
-	}
-	FeMul(&t1, z, &t1)
-	FeMul(&t0, &t0, &t1)
-	FeSquare(&t0, &t0)
-	for i = 1; i < 1; i++ {
-		FeSquare(&t0, &t0)
-	}
-	FeMul(&t0, &t1, &t0)
-	FeSquare(&t1, &t0)
-	for i = 1; i < 5; i++ {
-		FeSquare(&t1, &t1)
-	}
-	FeMul(&t0, &t1, &t0)
-	FeSquare(&t1, &t0)
-	for i = 1; i < 10; i++ {
-		FeSquare(&t1, &t1)
-	}
-	FeMul(&t1, &t1, &t0)
-	FeSquare(&t2, &t1)
-	for i = 1; i < 20; i++ {
-		FeSquare(&t2, &t2)
-	}
-	FeMul(&t1, &t2, &t1)
-	FeSquare(&t1, &t1)
-	for i = 1; i < 10; i++ {
-		FeSquare(&t1, &t1)
-	}
-	FeMul(&t0, &t1, &t0)
-	FeSquare(&t1, &t0)
-	for i = 1; i < 50; i++ {
-		FeSquare(&t1, &t1)
-	}
-	FeMul(&t1, &t1, &t0)
-	FeSquare(&t2, &t1)
-	for i = 1; i < 100; i++ {
-		FeSquare(&t2, &t2)
-	}
-	FeMul(&t1, &t2, &t1)
-	FeSquare(&t1, &t1)
-	for i = 1; i < 50; i++ {
-		FeSquare(&t1, &t1)
-	}
-	FeMul(&t0, &t1, &t0)
-	FeSquare(&t0, &t0)
-	for i = 1; i < 2; i++ {
-		FeSquare(&t0, &t0)
-	}
-	FeMul(out, &t0, z)
-}
-
-// Group elements are members of the elliptic curve -x^2 + y^2 = 1 + d * x^2 *
-// y^2 where d = -121665/121666.
-//
-// Several representations are used:
-//   ProjectiveGroupElement: (X:Y:Z) satisfying x=X/Z, y=Y/Z
-//   ExtendedGroupElement: (X:Y:Z:T) satisfying x=X/Z, y=Y/Z, XY=ZT
-//   CompletedGroupElement: ((X:Z),(Y:T)) satisfying x=X/Z, y=Y/T
-//   PreComputedGroupElement: (y+x,y-x,2dxy)
-
-type ProjectiveGroupElement struct {
-	X, Y, Z FieldElement
-}
-
-type ExtendedGroupElement struct {
-	X, Y, Z, T FieldElement
-}
-
-type CompletedGroupElement struct {
-	X, Y, Z, T FieldElement
-}
-
-type PreComputedGroupElement struct {
-	yPlusX, yMinusX, xy2d FieldElement
-}
-
-type CachedGroupElement struct {
-	yPlusX, yMinusX, Z, T2d FieldElement
-}
-
-func (p *ProjectiveGroupElement) Zero() {
-	FeZero(&p.X)
-	FeOne(&p.Y)
-	FeOne(&p.Z)
-}
-
-func (p *ProjectiveGroupElement) Double(r *CompletedGroupElement) {
-	var t0 FieldElement
-
-	FeSquare(&r.X, &p.X)
-	FeSquare(&r.Z, &p.Y)
-	FeSquare2(&r.T, &p.Z)
-	FeAdd(&r.Y, &p.X, &p.Y)
-	FeSquare(&t0, &r.Y)
-	FeAdd(&r.Y, &r.Z, &r.X)
-	FeSub(&r.Z, &r.Z, &r.X)
-	FeSub(&r.X, &t0, &r.Y)
-	FeSub(&r.T, &r.T, &r.Z)
-}
-
-func (p *ProjectiveGroupElement) ToBytes(s *[32]byte) {
-	var recip, x, y FieldElement
-
-	FeInvert(&recip, &p.Z)
-	FeMul(&x, &p.X, &recip)
-	FeMul(&y, &p.Y, &recip)
-	FeToBytes(s, &y)
-	s[31] ^= FeIsNegative(&x) << 7
-}
-
-func (p *ExtendedGroupElement) Zero() {
-	FeZero(&p.X)
-	FeOne(&p.Y)
-	FeOne(&p.Z)
-	FeZero(&p.T)
-}
-
-func (p *ExtendedGroupElement) Double(r *CompletedGroupElement) {
-	var q ProjectiveGroupElement
-	p.ToProjective(&q)
-	q.Double(r)
-}
-
-func (p *ExtendedGroupElement) ToCached(r *CachedGroupElement) {
-	FeAdd(&r.yPlusX, &p.Y, &p.X)
-	FeSub(&r.yMinusX, &p.Y, &p.X)
-	FeCopy(&r.Z, &p.Z)
-	FeMul(&r.T2d, &p.T, &d2)
-}
-
-func (p *ExtendedGroupElement) ToProjective(r *ProjectiveGroupElement) {
-	FeCopy(&r.X, &p.X)
-	FeCopy(&r.Y, &p.Y)
-	FeCopy(&r.Z, &p.Z)
-}
-
-func (p *ExtendedGroupElement) ToBytes(s *[32]byte) {
-	var recip, x, y FieldElement
-
-	FeInvert(&recip, &p.Z)
-	FeMul(&x, &p.X, &recip)
-	FeMul(&y, &p.Y, &recip)
-	FeToBytes(s, &y)
-	s[31] ^= FeIsNegative(&x) << 7
-}
-
-func (p *ExtendedGroupElement) FromBytes(s *[32]byte) bool {
-	var u, v, v3, vxx, check FieldElement
-
-	FeFromBytes(&p.Y, s)
-	FeOne(&p.Z)
-	FeSquare(&u, &p.Y)
-	FeMul(&v, &u, &d)
-	FeSub(&u, &u, &p.Z) // y = y^2-1
-	FeAdd(&v, &v, &p.Z) // v = dy^2+1
-
-	FeSquare(&v3, &v)
-	FeMul(&v3, &v3, &v) // v3 = v^3
-	FeSquare(&p.X, &v3)
-	FeMul(&p.X, &p.X, &v)
-	FeMul(&p.X, &p.X, &u) // x = uv^7
-
-	fePow22523(&p.X, &p.X) // x = (uv^7)^((q-5)/8)
-	FeMul(&p.X, &p.X, &v3)
-	FeMul(&p.X, &p.X, &u) // x = uv^3(uv^7)^((q-5)/8)
-
-	var tmpX, tmp2 [32]byte
-
-	FeSquare(&vxx, &p.X)
-	FeMul(&vxx, &vxx, &v)
-	FeSub(&check, &vxx, &u) // vx^2-u
-	if FeIsNonZero(&check) == 1 {
-		FeAdd(&check, &vxx, &u) // vx^2+u
-		if FeIsNonZero(&check) == 1 {
-			return false
-		}
-		FeMul(&p.X, &p.X, &SqrtM1)
-
-		FeToBytes(&tmpX, &p.X)
-		for i, v := range tmpX {
-			tmp2[31-i] = v
-		}
-	}
-
-	if FeIsNegative(&p.X) != (s[31] >> 7) {
-		FeNeg(&p.X, &p.X)
-	}
-
-	FeMul(&p.T, &p.X, &p.Y)
-	return true
-}
-
-func (p *CompletedGroupElement) ToProjective(r *ProjectiveGroupElement) {
-	FeMul(&r.X, &p.X, &p.T)
-	FeMul(&r.Y, &p.Y, &p.Z)
-	FeMul(&r.Z, &p.Z, &p.T)
-}
-
-func (p *CompletedGroupElement) ToExtended(r *ExtendedGroupElement) {
-	FeMul(&r.X, &p.X, &p.T)
-	FeMul(&r.Y, &p.Y, &p.Z)
-	FeMul(&r.Z, &p.Z, &p.T)
-	FeMul(&r.T, &p.X, &p.Y)
-}
-
-func (p *PreComputedGroupElement) Zero() {
-	FeOne(&p.yPlusX)
-	FeOne(&p.yMinusX)
-	FeZero(&p.xy2d)
-}
-
-func geAdd(r *CompletedGroupElement, p *ExtendedGroupElement, q *CachedGroupElement) {
-	var t0 FieldElement
-
-	FeAdd(&r.X, &p.Y, &p.X)
-	FeSub(&r.Y, &p.Y, &p.X)
-	FeMul(&r.Z, &r.X, &q.yPlusX)
-	FeMul(&r.Y, &r.Y, &q.yMinusX)
-	FeMul(&r.T, &q.T2d, &p.T)
-	FeMul(&r.X, &p.Z, &q.Z)
-	FeAdd(&t0, &r.X, &r.X)
-	FeSub(&r.X, &r.Z, &r.Y)
-	FeAdd(&r.Y, &r.Z, &r.Y)
-	FeAdd(&r.Z, &t0, &r.T)
-	FeSub(&r.T, &t0, &r.T)
-}
-
-func geSub(r *CompletedGroupElement, p *ExtendedGroupElement, q *CachedGroupElement) {
-	var t0 FieldElement
-
-	FeAdd(&r.X, &p.Y, &p.X)
-	FeSub(&r.Y, &p.Y, &p.X)
-	FeMul(&r.Z, &r.X, &q.yMinusX)
-	FeMul(&r.Y, &r.Y, &q.yPlusX)
-	FeMul(&r.T, &q.T2d, &p.T)
-	FeMul(&r.X, &p.Z, &q.Z)
-	FeAdd(&t0, &r.X, &r.X)
-	FeSub(&r.X, &r.Z, &r.Y)
-	FeAdd(&r.Y, &r.Z, &r.Y)
-	FeSub(&r.Z, &t0, &r.T)
-	FeAdd(&r.T, &t0, &r.T)
-}
-
-func geMixedAdd(r *CompletedGroupElement, p *ExtendedGroupElement, q *PreComputedGroupElement) {
-	var t0 FieldElement
-
-	FeAdd(&r.X, &p.Y, &p.X)
-	FeSub(&r.Y, &p.Y, &p.X)
-	FeMul(&r.Z, &r.X, &q.yPlusX)
-	FeMul(&r.Y, &r.Y, &q.yMinusX)
-	FeMul(&r.T, &q.xy2d, &p.T)
-	FeAdd(&t0, &p.Z, &p.Z)
-	FeSub(&r.X, &r.Z, &r.Y)
-	FeAdd(&r.Y, &r.Z, &r.Y)
-	FeAdd(&r.Z, &t0, &r.T)
-	FeSub(&r.T, &t0, &r.T)
-}
-
-func geMixedSub(r *CompletedGroupElement, p *ExtendedGroupElement, q *PreComputedGroupElement) {
-	var t0 FieldElement
-
-	FeAdd(&r.X, &p.Y, &p.X)
-	FeSub(&r.Y, &p.Y, &p.X)
-	FeMul(&r.Z, &r.X, &q.yMinusX)
-	FeMul(&r.Y, &r.Y, &q.yPlusX)
-	FeMul(&r.T, &q.xy2d, &p.T)
-	FeAdd(&t0, &p.Z, &p.Z)
-	FeSub(&r.X, &r.Z, &r.Y)
-	FeAdd(&r.Y, &r.Z, &r.Y)
-	FeSub(&r.Z, &t0, &r.T)
-	FeAdd(&r.T, &t0, &r.T)
-}
-
-func slide(r *[256]int8, a *[32]byte) {
-	for i := range r {
-		r[i] = int8(1 & (a[i>>3] >> uint(i&7)))
-	}
-
-	for i := range r {
-		if r[i] != 0 {
-			for b := 1; b <= 6 && i+b < 256; b++ {
-				if r[i+b] != 0 {
-					if r[i]+(r[i+b]<<uint(b)) <= 15 {
-						r[i] += r[i+b] << uint(b)
-						r[i+b] = 0
-					} else if r[i]-(r[i+b]<<uint(b)) >= -15 {
-						r[i] -= r[i+b] << uint(b)
-						for k := i + b; k < 256; k++ {
-							if r[k] == 0 {
-								r[k] = 1
-								break
-							}
-							r[k] = 0
-						}
-					} else {
-						break
-					}
-				}
-			}
-		}
-	}
-}
-
-// GeDoubleScalarMultVartime sets r = a*A + b*B
-// where a = a[0]+256*a[1]+...+256^31 a[31].
-// and b = b[0]+256*b[1]+...+256^31 b[31].
-// B is the Ed25519 base point (x,4/5) with x positive.
-func GeDoubleScalarMultVartime(r *ProjectiveGroupElement, a *[32]byte, A *ExtendedGroupElement, b *[32]byte) {
-	var aSlide, bSlide [256]int8
-	var Ai [8]CachedGroupElement // A,3A,5A,7A,9A,11A,13A,15A
-	var t CompletedGroupElement
-	var u, A2 ExtendedGroupElement
-	var i int
-
-	slide(&aSlide, a)
-	slide(&bSlide, b)
-
-	A.ToCached(&Ai[0])
-	A.Double(&t)
-	t.ToExtended(&A2)
-
-	for i := 0; i < 7; i++ {
-		geAdd(&t, &A2, &Ai[i])
-		t.ToExtended(&u)
-		u.ToCached(&Ai[i+1])
-	}
-
-	r.Zero()
-
-	for i = 255; i >= 0; i-- {
-		if aSlide[i] != 0 || bSlide[i] != 0 {
-			break
-		}
-	}
-
-	for ; i >= 0; i-- {
-		r.Double(&t)
-
-		if aSlide[i] > 0 {
-			t.ToExtended(&u)
-			geAdd(&t, &u, &Ai[aSlide[i]/2])
-		} else if aSlide[i] < 0 {
-			t.ToExtended(&u)
-			geSub(&t, &u, &Ai[(-aSlide[i])/2])
-		}
-
-		if bSlide[i] > 0 {
-			t.ToExtended(&u)
-			geMixedAdd(&t, &u, &bi[bSlide[i]/2])
-		} else if bSlide[i] < 0 {
-			t.ToExtended(&u)
-			geMixedSub(&t, &u, &bi[(-bSlide[i])/2])
-		}
-
-		t.ToProjective(r)
-	}
-}
-
-// equal returns 1 if b == c and 0 otherwise, assuming that b and c are
-// non-negative.
-func equal(b, c int32) int32 {
-	x := uint32(b ^ c)
-	x--
-	return int32(x >> 31)
-}
-
-// negative returns 1 if b < 0 and 0 otherwise.
-func negative(b int32) int32 {
-	return (b >> 31) & 1
-}
-
-func PreComputedGroupElementCMove(t, u *PreComputedGroupElement, b int32) {
-	FeCMove(&t.yPlusX, &u.yPlusX, b)
-	FeCMove(&t.yMinusX, &u.yMinusX, b)
-	FeCMove(&t.xy2d, &u.xy2d, b)
-}
-
-func selectPoint(t *PreComputedGroupElement, pos int32, b int32) {
-	var minusT PreComputedGroupElement
-	bNegative := negative(b)
-	bAbs := b - (((-bNegative) & b) << 1)
-
-	t.Zero()
-	for i := int32(0); i < 8; i++ {
-		PreComputedGroupElementCMove(t, &base[pos][i], equal(bAbs, i+1))
-	}
-	FeCopy(&minusT.yPlusX, &t.yMinusX)
-	FeCopy(&minusT.yMinusX, &t.yPlusX)
-	FeNeg(&minusT.xy2d, &t.xy2d)
-	PreComputedGroupElementCMove(t, &minusT, bNegative)
-}
-
-// GeScalarMultBase computes h = a*B, where
-//   a = a[0]+256*a[1]+...+256^31 a[31]
-//   B is the Ed25519 base point (x,4/5) with x positive.
-//
-// Preconditions:
-//   a[31] <= 127
-func GeScalarMultBase(h *ExtendedGroupElement, a *[32]byte) {
-	var e [64]int8
-
-	for i, v := range a {
-		e[2*i] = int8(v & 15)
-		e[2*i+1] = int8((v >> 4) & 15)
-	}
-
-	// each e[i] is between 0 and 15 and e[63] is between 0 and 7.
-
-	carry := int8(0)
-	for i := 0; i < 63; i++ {
-		e[i] += carry
-		carry = (e[i] + 8) >> 4
-		e[i] -= carry << 4
-	}
-	e[63] += carry
-	// each e[i] is between -8 and 8.
-
-	h.Zero()
-	var t PreComputedGroupElement
-	var r CompletedGroupElement
-	for i := int32(1); i < 64; i += 2 {
-		selectPoint(&t, i/2, int32(e[i]))
-		geMixedAdd(&r, h, &t)
-		r.ToExtended(h)
-	}
-
-	var s ProjectiveGroupElement
-
-	h.Double(&r)
-	r.ToProjective(&s)
-	s.Double(&r)
-	r.ToProjective(&s)
-	s.Double(&r)
-	r.ToProjective(&s)
-	s.Double(&r)
-	r.ToExtended(h)
-
-	for i := int32(0); i < 64; i += 2 {
-		selectPoint(&t, i/2, int32(e[i]))
-		geMixedAdd(&r, h, &t)
-		r.ToExtended(h)
-	}
-}
-
-// The scalars are GF(2^252 + 27742317777372353535851937790883648493).
-
-// Input:
-//   a[0]+256*a[1]+...+256^31*a[31] = a
-//   b[0]+256*b[1]+...+256^31*b[31] = b
-//   c[0]+256*c[1]+...+256^31*c[31] = c
-//
-// Output:
-//   s[0]+256*s[1]+...+256^31*s[31] = (ab+c) mod l
-//   where l = 2^252 + 27742317777372353535851937790883648493.
-func ScMulAdd(s, a, b, c *[32]byte) {
-	a0 := 2097151 & load3(a[:])
-	a1 := 2097151 & (load4(a[2:]) >> 5)
-	a2 := 2097151 & (load3(a[5:]) >> 2)
-	a3 := 2097151 & (load4(a[7:]) >> 7)
-	a4 := 2097151 & (load4(a[10:]) >> 4)
-	a5 := 2097151 & (load3(a[13:]) >> 1)
-	a6 := 2097151 & (load4(a[15:]) >> 6)
-	a7 := 2097151 & (load3(a[18:]) >> 3)
-	a8 := 2097151 & load3(a[21:])
-	a9 := 2097151 & (load4(a[23:]) >> 5)
-	a10 := 2097151 & (load3(a[26:]) >> 2)
-	a11 := (load4(a[28:]) >> 7)
-	b0 := 2097151 & load3(b[:])
-	b1 := 2097151 & (load4(b[2:]) >> 5)
-	b2 := 2097151 & (load3(b[5:]) >> 2)
-	b3 := 2097151 & (load4(b[7:]) >> 7)
-	b4 := 2097151 & (load4(b[10:]) >> 4)
-	b5 := 2097151 & (load3(b[13:]) >> 1)
-	b6 := 2097151 & (load4(b[15:]) >> 6)
-	b7 := 2097151 & (load3(b[18:]) >> 3)
-	b8 := 2097151 & load3(b[21:])
-	b9 := 2097151 & (load4(b[23:]) >> 5)
-	b10 := 2097151 & (load3(b[26:]) >> 2)
-	b11 := (load4(b[28:]) >> 7)
-	c0 := 2097151 & load3(c[:])
-	c1 := 2097151 & (load4(c[2:]) >> 5)
-	c2 := 2097151 & (load3(c[5:]) >> 2)
-	c3 := 2097151 & (load4(c[7:]) >> 7)
-	c4 := 2097151 & (load4(c[10:]) >> 4)
-	c5 := 2097151 & (load3(c[13:]) >> 1)
-	c6 := 2097151 & (load4(c[15:]) >> 6)
-	c7 := 2097151 & (load3(c[18:]) >> 3)
-	c8 := 2097151 & load3(c[21:])
-	c9 := 2097151 & (load4(c[23:]) >> 5)
-	c10 := 2097151 & (load3(c[26:]) >> 2)
-	c11 := (load4(c[28:]) >> 7)
-	var carry [23]int64
-
-	s0 := c0 + a0*b0
-	s1 := c1 + a0*b1 + a1*b0
-	s2 := c2 + a0*b2 + a1*b1 + a2*b0
-	s3 := c3 + a0*b3 + a1*b2 + a2*b1 + a3*b0
-	s4 := c4 + a0*b4 + a1*b3 + a2*b2 + a3*b1 + a4*b0
-	s5 := c5 + a0*b5 + a1*b4 + a2*b3 + a3*b2 + a4*b1 + a5*b0
-	s6 := c6 + a0*b6 + a1*b5 + a2*b4 + a3*b3 + a4*b2 + a5*b1 + a6*b0
-	s7 := c7 + a0*b7 + a1*b6 + a2*b5 + a3*b4 + a4*b3 + a5*b2 + a6*b1 + a7*b0
-	s8 := c8 + a0*b8 + a1*b7 + a2*b6 + a3*b5 + a4*b4 + a5*b3 + a6*b2 + a7*b1 + a8*b0
-	s9 := c9 + a0*b9 + a1*b8 + a2*b7 + a3*b6 + a4*b5 + a5*b4 + a6*b3 + a7*b2 + a8*b1 + a9*b0
-	s10 := c10 + a0*b10 + a1*b9 + a2*b8 + a3*b7 + a4*b6 + a5*b5 + a6*b4 + a7*b3 + a8*b2 + a9*b1 + a10*b0
-	s11 := c11 + a0*b11 + a1*b10 + a2*b9 + a3*b8 + a4*b7 + a5*b6 + a6*b5 + a7*b4 + a8*b3 + a9*b2 + a10*b1 + a11*b0
-	s12 := a1*b11 + a2*b10 + a3*b9 + a4*b8 + a5*b7 + a6*b6 + a7*b5 + a8*b4 + a9*b3 + a10*b2 + a11*b1
-	s13 := a2*b11 + a3*b10 + a4*b9 + a5*b8 + a6*b7 + a7*b6 + a8*b5 + a9*b4 + a10*b3 + a11*b2
-	s14 := a3*b11 + a4*b10 + a5*b9 + a6*b8 + a7*b7 + a8*b6 + a9*b5 + a10*b4 + a11*b3
-	s15 := a4*b11 + a5*b10 + a6*b9 + a7*b8 + a8*b7 + a9*b6 + a10*b5 + a11*b4
-	s16 := a5*b11 + a6*b10 + a7*b9 + a8*b8 + a9*b7 + a10*b6 + a11*b5
-	s17 := a6*b11 + a7*b10 + a8*b9 + a9*b8 + a10*b7 + a11*b6
-	s18 := a7*b11 + a8*b10 + a9*b9 + a10*b8 + a11*b7
-	s19 := a8*b11 + a9*b10 + a10*b9 + a11*b8
-	s20 := a9*b11 + a10*b10 + a11*b9
-	s21 := a10*b11 + a11*b10
-	s22 := a11 * b11
-	s23 := int64(0)
-
-	carry[0] = (s0 + (1 << 20)) >> 21
-	s1 += carry[0]
-	s0 -= carry[0] << 21
-	carry[2] = (s2 + (1 << 20)) >> 21
-	s3 += carry[2]
-	s2 -= carry[2] << 21
-	carry[4] = (s4 + (1 << 20)) >> 21
-	s5 += carry[4]
-	s4 -= carry[4] << 21
-	carry[6] = (s6 + (1 << 20)) >> 21
-	s7 += carry[6]
-	s6 -= carry[6] << 21
-	carry[8] = (s8 + (1 << 20)) >> 21
-	s9 += carry[8]
-	s8 -= carry[8] << 21
-	carry[10] = (s10 + (1 << 20)) >> 21
-	s11 += carry[10]
-	s10 -= carry[10] << 21
-	carry[12] = (s12 + (1 << 20)) >> 21
-	s13 += carry[12]
-	s12 -= carry[12] << 21
-	carry[14] = (s14 + (1 << 20)) >> 21
-	s15 += carry[14]
-	s14 -= carry[14] << 21
-	carry[16] = (s16 + (1 << 20)) >> 21
-	s17 += carry[16]
-	s16 -= carry[16] << 21
-	carry[18] = (s18 + (1 << 20)) >> 21
-	s19 += carry[18]
-	s18 -= carry[18] << 21
-	carry[20] = (s20 + (1 << 20)) >> 21
-	s21 += carry[20]
-	s20 -= carry[20] << 21
-	carry[22] = (s22 + (1 << 20)) >> 21
-	s23 += carry[22]
-	s22 -= carry[22] << 21
-
-	carry[1] = (s1 + (1 << 20)) >> 21
-	s2 += carry[1]
-	s1 -= carry[1] << 21
-	carry[3] = (s3 + (1 << 20)) >> 21
-	s4 += carry[3]
-	s3 -= carry[3] << 21
-	carry[5] = (s5 + (1 << 20)) >> 21
-	s6 += carry[5]
-	s5 -= carry[5] << 21
-	carry[7] = (s7 + (1 << 20)) >> 21
-	s8 += carry[7]
-	s7 -= carry[7] << 21
-	carry[9] = (s9 + (1 << 20)) >> 21
-	s10 += carry[9]
-	s9 -= carry[9] << 21
-	carry[11] = (s11 + (1 << 20)) >> 21
-	s12 += carry[11]
-	s11 -= carry[11] << 21
-	carry[13] = (s13 + (1 << 20)) >> 21
-	s14 += carry[13]
-	s13 -= carry[13] << 21
-	carry[15] = (s15 + (1 << 20)) >> 21
-	s16 += carry[15]
-	s15 -= carry[15] << 21
-	carry[17] = (s17 + (1 << 20)) >> 21
-	s18 += carry[17]
-	s17 -= carry[17] << 21
-	carry[19] = (s19 + (1 << 20)) >> 21
-	s20 += carry[19]
-	s19 -= carry[19] << 21
-	carry[21] = (s21 + (1 << 20)) >> 21
-	s22 += carry[21]
-	s21 -= carry[21] << 21
-
-	s11 += s23 * 666643
-	s12 += s23 * 470296
-	s13 += s23 * 654183
-	s14 -= s23 * 997805
-	s15 += s23 * 136657
-	s16 -= s23 * 683901
-	s23 = 0
-
-	s10 += s22 * 666643
-	s11 += s22 * 470296
-	s12 += s22 * 654183
-	s13 -= s22 * 997805
-	s14 += s22 * 136657
-	s15 -= s22 * 683901
-	s22 = 0
-
-	s9 += s21 * 666643
-	s10 += s21 * 470296
-	s11 += s21 * 654183
-	s12 -= s21 * 997805
-	s13 += s21 * 136657
-	s14 -= s21 * 683901
-	s21 = 0
-
-	s8 += s20 * 666643
-	s9 += s20 * 470296
-	s10 += s20 * 654183
-	s11 -= s20 * 997805
-	s12 += s20 * 136657
-	s13 -= s20 * 683901
-	s20 = 0
-
-	s7 += s19 * 666643
-	s8 += s19 * 470296
-	s9 += s19 * 654183
-	s10 -= s19 * 997805
-	s11 += s19 * 136657
-	s12 -= s19 * 683901
-	s19 = 0
-
-	s6 += s18 * 666643
-	s7 += s18 * 470296
-	s8 += s18 * 654183
-	s9 -= s18 * 997805
-	s10 += s18 * 136657
-	s11 -= s18 * 683901
-	s18 = 0
-
-	carry[6] = (s6 + (1 << 20)) >> 21
-	s7 += carry[6]
-	s6 -= carry[6] << 21
-	carry[8] = (s8 + (1 << 20)) >> 21
-	s9 += carry[8]
-	s8 -= carry[8] << 21
-	carry[10] = (s10 + (1 << 20)) >> 21
-	s11 += carry[10]
-	s10 -= carry[10] << 21
-	carry[12] = (s12 + (1 << 20)) >> 21
-	s13 += carry[12]
-	s12 -= carry[12] << 21
-	carry[14] = (s14 + (1 << 20)) >> 21
-	s15 += carry[14]
-	s14 -= carry[14] << 21
-	carry[16] = (s16 + (1 << 20)) >> 21
-	s17 += carry[16]
-	s16 -= carry[16] << 21
-
-	carry[7] = (s7 + (1 << 20)) >> 21
-	s8 += carry[7]
-	s7 -= carry[7] << 21
-	carry[9] = (s9 + (1 << 20)) >> 21
-	s10 += carry[9]
-	s9 -= carry[9] << 21
-	carry[11] = (s11 + (1 << 20)) >> 21
-	s12 += carry[11]
-	s11 -= carry[11] << 21
-	carry[13] = (s13 + (1 << 20)) >> 21
-	s14 += carry[13]
-	s13 -= carry[13] << 21
-	carry[15] = (s15 + (1 << 20)) >> 21
-	s16 += carry[15]
-	s15 -= carry[15] << 21
-
-	s5 += s17 * 666643
-	s6 += s17 * 470296
-	s7 += s17 * 654183
-	s8 -= s17 * 997805
-	s9 += s17 * 136657
-	s10 -= s17 * 683901
-	s17 = 0
-
-	s4 += s16 * 666643
-	s5 += s16 * 470296
-	s6 += s16 * 654183
-	s7 -= s16 * 997805
-	s8 += s16 * 136657
-	s9 -= s16 * 683901
-	s16 = 0
-
-	s3 += s15 * 666643
-	s4 += s15 * 470296
-	s5 += s15 * 654183
-	s6 -= s15 * 997805
-	s7 += s15 * 136657
-	s8 -= s15 * 683901
-	s15 = 0
-
-	s2 += s14 * 666643
-	s3 += s14 * 470296
-	s4 += s14 * 654183
-	s5 -= s14 * 997805
-	s6 += s14 * 136657
-	s7 -= s14 * 683901
-	s14 = 0
-
-	s1 += s13 * 666643
-	s2 += s13 * 470296
-	s3 += s13 * 654183
-	s4 -= s13 * 997805
-	s5 += s13 * 136657
-	s6 -= s13 * 683901
-	s13 = 0
-
-	s0 += s12 * 666643
-	s1 += s12 * 470296
-	s2 += s12 * 654183
-	s3 -= s12 * 997805
-	s4 += s12 * 136657
-	s5 -= s12 * 683901
-	s12 = 0
-
-	carry[0] = (s0 + (1 << 20)) >> 21
-	s1 += carry[0]
-	s0 -= carry[0] << 21
-	carry[2] = (s2 + (1 << 20)) >> 21
-	s3 += carry[2]
-	s2 -= carry[2] << 21
-	carry[4] = (s4 + (1 << 20)) >> 21
-	s5 += carry[4]
-	s4 -= carry[4] << 21
-	carry[6] = (s6 + (1 << 20)) >> 21
-	s7 += carry[6]
-	s6 -= carry[6] << 21
-	carry[8] = (s8 + (1 << 20)) >> 21
-	s9 += carry[8]
-	s8 -= carry[8] << 21
-	carry[10] = (s10 + (1 << 20)) >> 21
-	s11 += carry[10]
-	s10 -= carry[10] << 21
-
-	carry[1] = (s1 + (1 << 20)) >> 21
-	s2 += carry[1]
-	s1 -= carry[1] << 21
-	carry[3] = (s3 + (1 << 20)) >> 21
-	s4 += carry[3]
-	s3 -= carry[3] << 21
-	carry[5] = (s5 + (1 << 20)) >> 21
-	s6 += carry[5]
-	s5 -= carry[5] << 21
-	carry[7] = (s7 + (1 << 20)) >> 21
-	s8 += carry[7]
-	s7 -= carry[7] << 21
-	carry[9] = (s9 + (1 << 20)) >> 21
-	s10 += carry[9]
-	s9 -= carry[9] << 21
-	carry[11] = (s11 + (1 << 20)) >> 21
-	s12 += carry[11]
-	s11 -= carry[11] << 21
-
-	s0 += s12 * 666643
-	s1 += s12 * 470296
-	s2 += s12 * 654183
-	s3 -= s12 * 997805
-	s4 += s12 * 136657
-	s5 -= s12 * 683901
-	s12 = 0
-
-	carry[0] = s0 >> 21
-	s1 += carry[0]
-	s0 -= carry[0] << 21
-	carry[1] = s1 >> 21
-	s2 += carry[1]
-	s1 -= carry[1] << 21
-	carry[2] = s2 >> 21
-	s3 += carry[2]
-	s2 -= carry[2] << 21
-	carry[3] = s3 >> 21
-	s4 += carry[3]
-	s3 -= carry[3] << 21
-	carry[4] = s4 >> 21
-	s5 += carry[4]
-	s4 -= carry[4] << 21
-	carry[5] = s5 >> 21
-	s6 += carry[5]
-	s5 -= carry[5] << 21
-	carry[6] = s6 >> 21
-	s7 += carry[6]
-	s6 -= carry[6] << 21
-	carry[7] = s7 >> 21
-	s8 += carry[7]
-	s7 -= carry[7] << 21
-	carry[8] = s8 >> 21
-	s9 += carry[8]
-	s8 -= carry[8] << 21
-	carry[9] = s9 >> 21
-	s10 += carry[9]
-	s9 -= carry[9] << 21
-	carry[10] = s10 >> 21
-	s11 += carry[10]
-	s10 -= carry[10] << 21
-	carry[11] = s11 >> 21
-	s12 += carry[11]
-	s11 -= carry[11] << 21
-
-	s0 += s12 * 666643
-	s1 += s12 * 470296
-	s2 += s12 * 654183
-	s3 -= s12 * 997805
-	s4 += s12 * 136657
-	s5 -= s12 * 683901
-	s12 = 0
-
-	carry[0] = s0 >> 21
-	s1 += carry[0]
-	s0 -= carry[0] << 21
-	carry[1] = s1 >> 21
-	s2 += carry[1]
-	s1 -= carry[1] << 21
-	carry[2] = s2 >> 21
-	s3 += carry[2]
-	s2 -= carry[2] << 21
-	carry[3] = s3 >> 21
-	s4 += carry[3]
-	s3 -= carry[3] << 21
-	carry[4] = s4 >> 21
-	s5 += carry[4]
-	s4 -= carry[4] << 21
-	carry[5] = s5 >> 21
-	s6 += carry[5]
-	s5 -= carry[5] << 21
-	carry[6] = s6 >> 21
-	s7 += carry[6]
-	s6 -= carry[6] << 21
-	carry[7] = s7 >> 21
-	s8 += carry[7]
-	s7 -= carry[7] << 21
-	carry[8] = s8 >> 21
-	s9 += carry[8]
-	s8 -= carry[8] << 21
-	carry[9] = s9 >> 21
-	s10 += carry[9]
-	s9 -= carry[9] << 21
-	carry[10] = s10 >> 21
-	s11 += carry[10]
-	s10 -= carry[10] << 21
-
-	s[0] = byte(s0 >> 0)
-	s[1] = byte(s0 >> 8)
-	s[2] = byte((s0 >> 16) | (s1 << 5))
-	s[3] = byte(s1 >> 3)
-	s[4] = byte(s1 >> 11)
-	s[5] = byte((s1 >> 19) | (s2 << 2))
-	s[6] = byte(s2 >> 6)
-	s[7] = byte((s2 >> 14) | (s3 << 7))
-	s[8] = byte(s3 >> 1)
-	s[9] = byte(s3 >> 9)
-	s[10] = byte((s3 >> 17) | (s4 << 4))
-	s[11] = byte(s4 >> 4)
-	s[12] = byte(s4 >> 12)
-	s[13] = byte((s4 >> 20) | (s5 << 1))
-	s[14] = byte(s5 >> 7)
-	s[15] = byte((s5 >> 15) | (s6 << 6))
-	s[16] = byte(s6 >> 2)
-	s[17] = byte(s6 >> 10)
-	s[18] = byte((s6 >> 18) | (s7 << 3))
-	s[19] = byte(s7 >> 5)
-	s[20] = byte(s7 >> 13)
-	s[21] = byte(s8 >> 0)
-	s[22] = byte(s8 >> 8)
-	s[23] = byte((s8 >> 16) | (s9 << 5))
-	s[24] = byte(s9 >> 3)
-	s[25] = byte(s9 >> 11)
-	s[26] = byte((s9 >> 19) | (s10 << 2))
-	s[27] = byte(s10 >> 6)
-	s[28] = byte((s10 >> 14) | (s11 << 7))
-	s[29] = byte(s11 >> 1)
-	s[30] = byte(s11 >> 9)
-	s[31] = byte(s11 >> 17)
-}
-
-// Input:
-//   s[0]+256*s[1]+...+256^63*s[63] = s
-//
-// Output:
-//   s[0]+256*s[1]+...+256^31*s[31] = s mod l
-//   where l = 2^252 + 27742317777372353535851937790883648493.
-func ScReduce(out *[32]byte, s *[64]byte) {
-	s0 := 2097151 & load3(s[:])
-	s1 := 2097151 & (load4(s[2:]) >> 5)
-	s2 := 2097151 & (load3(s[5:]) >> 2)
-	s3 := 2097151 & (load4(s[7:]) >> 7)
-	s4 := 2097151 & (load4(s[10:]) >> 4)
-	s5 := 2097151 & (load3(s[13:]) >> 1)
-	s6 := 2097151 & (load4(s[15:]) >> 6)
-	s7 := 2097151 & (load3(s[18:]) >> 3)
-	s8 := 2097151 & load3(s[21:])
-	s9 := 2097151 & (load4(s[23:]) >> 5)
-	s10 := 2097151 & (load3(s[26:]) >> 2)
-	s11 := 2097151 & (load4(s[28:]) >> 7)
-	s12 := 2097151 & (load4(s[31:]) >> 4)
-	s13 := 2097151 & (load3(s[34:]) >> 1)
-	s14 := 2097151 & (load4(s[36:]) >> 6)
-	s15 := 2097151 & (load3(s[39:]) >> 3)
-	s16 := 2097151 & load3(s[42:])
-	s17 := 2097151 & (load4(s[44:]) >> 5)
-	s18 := 2097151 & (load3(s[47:]) >> 2)
-	s19 := 2097151 & (load4(s[49:]) >> 7)
-	s20 := 2097151 & (load4(s[52:]) >> 4)
-	s21 := 2097151 & (load3(s[55:]) >> 1)
-	s22 := 2097151 & (load4(s[57:]) >> 6)
-	s23 := (load4(s[60:]) >> 3)
-
-	s11 += s23 * 666643
-	s12 += s23 * 470296
-	s13 += s23 * 654183
-	s14 -= s23 * 997805
-	s15 += s23 * 136657
-	s16 -= s23 * 683901
-	s23 = 0
-
-	s10 += s22 * 666643
-	s11 += s22 * 470296
-	s12 += s22 * 654183
-	s13 -= s22 * 997805
-	s14 += s22 * 136657
-	s15 -= s22 * 683901
-	s22 = 0
-
-	s9 += s21 * 666643
-	s10 += s21 * 470296
-	s11 += s21 * 654183
-	s12 -= s21 * 997805
-	s13 += s21 * 136657
-	s14 -= s21 * 683901
-	s21 = 0
-
-	s8 += s20 * 666643
-	s9 += s20 * 470296
-	s10 += s20 * 654183
-	s11 -= s20 * 997805
-	s12 += s20 * 136657
-	s13 -= s20 * 683901
-	s20 = 0
-
-	s7 += s19 * 666643
-	s8 += s19 * 470296
-	s9 += s19 * 654183
-	s10 -= s19 * 997805
-	s11 += s19 * 136657
-	s12 -= s19 * 683901
-	s19 = 0
-
-	s6 += s18 * 666643
-	s7 += s18 * 470296
-	s8 += s18 * 654183
-	s9 -= s18 * 997805
-	s10 += s18 * 136657
-	s11 -= s18 * 683901
-	s18 = 0
-
-	var carry [17]int64
-
-	carry[6] = (s6 + (1 << 20)) >> 21
-	s7 += carry[6]
-	s6 -= carry[6] << 21
-	carry[8] = (s8 + (1 << 20)) >> 21
-	s9 += carry[8]
-	s8 -= carry[8] << 21
-	carry[10] = (s10 + (1 << 20)) >> 21
-	s11 += carry[10]
-	s10 -= carry[10] << 21
-	carry[12] = (s12 + (1 << 20)) >> 21
-	s13 += carry[12]
-	s12 -= carry[12] << 21
-	carry[14] = (s14 + (1 << 20)) >> 21
-	s15 += carry[14]
-	s14 -= carry[14] << 21
-	carry[16] = (s16 + (1 << 20)) >> 21
-	s17 += carry[16]
-	s16 -= carry[16] << 21
-
-	carry[7] = (s7 + (1 << 20)) >> 21
-	s8 += carry[7]
-	s7 -= carry[7] << 21
-	carry[9] = (s9 + (1 << 20)) >> 21
-	s10 += carry[9]
-	s9 -= carry[9] << 21
-	carry[11] = (s11 + (1 << 20)) >> 21
-	s12 += carry[11]
-	s11 -= carry[11] << 21
-	carry[13] = (s13 + (1 << 20)) >> 21
-	s14 += carry[13]
-	s13 -= carry[13] << 21
-	carry[15] = (s15 + (1 << 20)) >> 21
-	s16 += carry[15]
-	s15 -= carry[15] << 21
-
-	s5 += s17 * 666643
-	s6 += s17 * 470296
-	s7 += s17 * 654183
-	s8 -= s17 * 997805
-	s9 += s17 * 136657
-	s10 -= s17 * 683901
-	s17 = 0
-
-	s4 += s16 * 666643
-	s5 += s16 * 470296
-	s6 += s16 * 654183
-	s7 -= s16 * 997805
-	s8 += s16 * 136657
-	s9 -= s16 * 683901
-	s16 = 0
-
-	s3 += s15 * 666643
-	s4 += s15 * 470296
-	s5 += s15 * 654183
-	s6 -= s15 * 997805
-	s7 += s15 * 136657
-	s8 -= s15 * 683901
-	s15 = 0
-
-	s2 += s14 * 666643
-	s3 += s14 * 470296
-	s4 += s14 * 654183
-	s5 -= s14 * 997805
-	s6 += s14 * 136657
-	s7 -= s14 * 683901
-	s14 = 0
-
-	s1 += s13 * 666643
-	s2 += s13 * 470296
-	s3 += s13 * 654183
-	s4 -= s13 * 997805
-	s5 += s13 * 136657
-	s6 -= s13 * 683901
-	s13 = 0
-
-	s0 += s12 * 666643
-	s1 += s12 * 470296
-	s2 += s12 * 654183
-	s3 -= s12 * 997805
-	s4 += s12 * 136657
-	s5 -= s12 * 683901
-	s12 = 0
-
-	carry[0] = (s0 + (1 << 20)) >> 21
-	s1 += carry[0]
-	s0 -= carry[0] << 21
-	carry[2] = (s2 + (1 << 20)) >> 21
-	s3 += carry[2]
-	s2 -= carry[2] << 21
-	carry[4] = (s4 + (1 << 20)) >> 21
-	s5 += carry[4]
-	s4 -= carry[4] << 21
-	carry[6] = (s6 + (1 << 20)) >> 21
-	s7 += carry[6]
-	s6 -= carry[6] << 21
-	carry[8] = (s8 + (1 << 20)) >> 21
-	s9 += carry[8]
-	s8 -= carry[8] << 21
-	carry[10] = (s10 + (1 << 20)) >> 21
-	s11 += carry[10]
-	s10 -= carry[10] << 21
-
-	carry[1] = (s1 + (1 << 20)) >> 21
-	s2 += carry[1]
-	s1 -= carry[1] << 21
-	carry[3] = (s3 + (1 << 20)) >> 21
-	s4 += carry[3]
-	s3 -= carry[3] << 21
-	carry[5] = (s5 + (1 << 20)) >> 21
-	s6 += carry[5]
-	s5 -= carry[5] << 21
-	carry[7] = (s7 + (1 << 20)) >> 21
-	s8 += carry[7]
-	s7 -= carry[7] << 21
-	carry[9] = (s9 + (1 << 20)) >> 21
-	s10 += carry[9]
-	s9 -= carry[9] << 21
-	carry[11] = (s11 + (1 << 20)) >> 21
-	s12 += carry[11]
-	s11 -= carry[11] << 21
-
-	s0 += s12 * 666643
-	s1 += s12 * 470296
-	s2 += s12 * 654183
-	s3 -= s12 * 997805
-	s4 += s12 * 136657
-	s5 -= s12 * 683901
-	s12 = 0
-
-	carry[0] = s0 >> 21
-	s1 += carry[0]
-	s0 -= carry[0] << 21
-	carry[1] = s1 >> 21
-	s2 += carry[1]
-	s1 -= carry[1] << 21
-	carry[2] = s2 >> 21
-	s3 += carry[2]
-	s2 -= carry[2] << 21
-	carry[3] = s3 >> 21
-	s4 += carry[3]
-	s3 -= carry[3] << 21
-	carry[4] = s4 >> 21
-	s5 += carry[4]
-	s4 -= carry[4] << 21
-	carry[5] = s5 >> 21
-	s6 += carry[5]
-	s5 -= carry[5] << 21
-	carry[6] = s6 >> 21
-	s7 += carry[6]
-	s6 -= carry[6] << 21
-	carry[7] = s7 >> 21
-	s8 += carry[7]
-	s7 -= carry[7] << 21
-	carry[8] = s8 >> 21
-	s9 += carry[8]
-	s8 -= carry[8] << 21
-	carry[9] = s9 >> 21
-	s10 += carry[9]
-	s9 -= carry[9] << 21
-	carry[10] = s10 >> 21
-	s11 += carry[10]
-	s10 -= carry[10] << 21
-	carry[11] = s11 >> 21
-	s12 += carry[11]
-	s11 -= carry[11] << 21
-
-	s0 += s12 * 666643
-	s1 += s12 * 470296
-	s2 += s12 * 654183
-	s3 -= s12 * 997805
-	s4 += s12 * 136657
-	s5 -= s12 * 683901
-	s12 = 0
-
-	carry[0] = s0 >> 21
-	s1 += carry[0]
-	s0 -= carry[0] << 21
-	carry[1] = s1 >> 21
-	s2 += carry[1]
-	s1 -= carry[1] << 21
-	carry[2] = s2 >> 21
-	s3 += carry[2]
-	s2 -= carry[2] << 21
-	carry[3] = s3 >> 21
-	s4 += carry[3]
-	s3 -= carry[3] << 21
-	carry[4] = s4 >> 21
-	s5 += carry[4]
-	s4 -= carry[4] << 21
-	carry[5] = s5 >> 21
-	s6 += carry[5]
-	s5 -= carry[5] << 21
-	carry[6] = s6 >> 21
-	s7 += carry[6]
-	s6 -= carry[6] << 21
-	carry[7] = s7 >> 21
-	s8 += carry[7]
-	s7 -= carry[7] << 21
-	carry[8] = s8 >> 21
-	s9 += carry[8]
-	s8 -= carry[8] << 21
-	carry[9] = s9 >> 21
-	s10 += carry[9]
-	s9 -= carry[9] << 21
-	carry[10] = s10 >> 21
-	s11 += carry[10]
-	s10 -= carry[10] << 21
-
-	out[0] = byte(s0 >> 0)
-	out[1] = byte(s0 >> 8)
-	out[2] = byte((s0 >> 16) | (s1 << 5))
-	out[3] = byte(s1 >> 3)
-	out[4] = byte(s1 >> 11)
-	out[5] = byte((s1 >> 19) | (s2 << 2))
-	out[6] = byte(s2 >> 6)
-	out[7] = byte((s2 >> 14) | (s3 << 7))
-	out[8] = byte(s3 >> 1)
-	out[9] = byte(s3 >> 9)
-	out[10] = byte((s3 >> 17) | (s4 << 4))
-	out[11] = byte(s4 >> 4)
-	out[12] = byte(s4 >> 12)
-	out[13] = byte((s4 >> 20) | (s5 << 1))
-	out[14] = byte(s5 >> 7)
-	out[15] = byte((s5 >> 15) | (s6 << 6))
-	out[16] = byte(s6 >> 2)
-	out[17] = byte(s6 >> 10)
-	out[18] = byte((s6 >> 18) | (s7 << 3))
-	out[19] = byte(s7 >> 5)
-	out[20] = byte(s7 >> 13)
-	out[21] = byte(s8 >> 0)
-	out[22] = byte(s8 >> 8)
-	out[23] = byte((s8 >> 16) | (s9 << 5))
-	out[24] = byte(s9 >> 3)
-	out[25] = byte(s9 >> 11)
-	out[26] = byte((s9 >> 19) | (s10 << 2))
-	out[27] = byte(s10 >> 6)
-	out[28] = byte((s10 >> 14) | (s11 << 7))
-	out[29] = byte(s11 >> 1)
-	out[30] = byte(s11 >> 9)
-	out[31] = byte(s11 >> 17)
-}
-
-// order is the order of Curve25519 in little-endian form.
-var order = [4]uint64{0x5812631a5cf5d3ed, 0x14def9dea2f79cd6, 0, 0x1000000000000000}
-
-// ScMinimal returns true if the given scalar is less than the order of the
-// curve.
-func ScMinimal(scalar *[32]byte) bool {
-	for i := 3; ; i-- {
-		v := binary.LittleEndian.Uint64(scalar[i*8:])
-		if v > order[i] {
-			return false
-		} else if v < order[i] {
-			break
-		} else if i == 0 {
-			return false
-		}
-	}
-
-	return true
-}
diff --git a/vendor/golang.org/x/net/internal/socket/cmsghdr.go b/vendor/golang.org/x/net/internal/socket/cmsghdr.go
index 0a73e277e09502757209be114e1d0b1aca37eb13..4bdaaaf1ad41cf2a0fa4d57c5dbcd8af7c5e1d42 100644
--- a/vendor/golang.org/x/net/internal/socket/cmsghdr.go
+++ b/vendor/golang.org/x/net/internal/socket/cmsghdr.go
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
+//go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris || zos
+// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris zos
 
 package socket
 
diff --git a/vendor/golang.org/x/net/internal/socket/cmsghdr_bsd.go b/vendor/golang.org/x/net/internal/socket/cmsghdr_bsd.go
index 14dbb3ad42de67377b90f9f51c6a9b4b9cad5349..0d30e0a0f2eaeae62f9cd98a6c08fdf6c35a091b 100644
--- a/vendor/golang.org/x/net/internal/socket/cmsghdr_bsd.go
+++ b/vendor/golang.org/x/net/internal/socket/cmsghdr_bsd.go
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build aix || darwin || dragonfly || freebsd || netbsd || openbsd
 // +build aix darwin dragonfly freebsd netbsd openbsd
 
 package socket
diff --git a/vendor/golang.org/x/net/internal/socket/cmsghdr_linux_32bit.go b/vendor/golang.org/x/net/internal/socket/cmsghdr_linux_32bit.go
index bac66811ddd2aff1cc6930ec2581460625551ce0..623cf30f4cc225ba2b9ca94a63b40e07dd62acdb 100644
--- a/vendor/golang.org/x/net/internal/socket/cmsghdr_linux_32bit.go
+++ b/vendor/golang.org/x/net/internal/socket/cmsghdr_linux_32bit.go
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build (arm || mips || mipsle || 386) && linux
 // +build arm mips mipsle 386
 // +build linux
 
diff --git a/vendor/golang.org/x/net/internal/socket/cmsghdr_linux_64bit.go b/vendor/golang.org/x/net/internal/socket/cmsghdr_linux_64bit.go
index 27be0efaca9242c9144e2b7ce05f05638beaa873..1ba43101fc78ac71efa09a14a4d8f6b2e171a587 100644
--- a/vendor/golang.org/x/net/internal/socket/cmsghdr_linux_64bit.go
+++ b/vendor/golang.org/x/net/internal/socket/cmsghdr_linux_64bit.go
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build (arm64 || amd64 || ppc64 || ppc64le || mips64 || mips64le || riscv64 || s390x) && linux
 // +build arm64 amd64 ppc64 ppc64le mips64 mips64le riscv64 s390x
 // +build linux
 
diff --git a/vendor/golang.org/x/net/internal/socket/cmsghdr_solaris_64bit.go b/vendor/golang.org/x/net/internal/socket/cmsghdr_solaris_64bit.go
index 7dedd430eb0a15766aaf5e22b02dab8c177d57eb..d3dbe1b8e015aab2ac7da39b0be23c2fee807f30 100644
--- a/vendor/golang.org/x/net/internal/socket/cmsghdr_solaris_64bit.go
+++ b/vendor/golang.org/x/net/internal/socket/cmsghdr_solaris_64bit.go
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build amd64
-// +build solaris
+//go:build amd64 && solaris
+// +build amd64,solaris
 
 package socket
 
diff --git a/vendor/golang.org/x/net/internal/socket/cmsghdr_stub.go b/vendor/golang.org/x/net/internal/socket/cmsghdr_stub.go
index e581011b055a1afd8b82192f03d95468dbfa3136..1d9f2ed625bc661b9fb138969d36931bc9513c2c 100644
--- a/vendor/golang.org/x/net/internal/socket/cmsghdr_stub.go
+++ b/vendor/golang.org/x/net/internal/socket/cmsghdr_stub.go
@@ -2,13 +2,24 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build !aix,!darwin,!dragonfly,!freebsd,!linux,!netbsd,!openbsd,!solaris
+//go:build !aix && !darwin && !dragonfly && !freebsd && !linux && !netbsd && !openbsd && !solaris && !zos
+// +build !aix,!darwin,!dragonfly,!freebsd,!linux,!netbsd,!openbsd,!solaris,!zos
 
 package socket
 
-type cmsghdr struct{}
+func controlHeaderLen() int {
+	return 0
+}
+
+func controlMessageLen(dataLen int) int {
+	return 0
+}
 
-const sizeofCmsghdr = 0
+func controlMessageSpace(dataLen int) int {
+	return 0
+}
+
+type cmsghdr struct{}
 
 func (h *cmsghdr) len() int { return 0 }
 func (h *cmsghdr) lvl() int { return 0 }
diff --git a/vendor/golang.org/x/net/internal/socket/cmsghdr_unix.go b/vendor/golang.org/x/net/internal/socket/cmsghdr_unix.go
new file mode 100644
index 0000000000000000000000000000000000000000..aa1b06203cf5bd764c3a25bf84fd51399b85d854
--- /dev/null
+++ b/vendor/golang.org/x/net/internal/socket/cmsghdr_unix.go
@@ -0,0 +1,22 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris
+// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
+
+package socket
+
+import "golang.org/x/sys/unix"
+
+func controlHeaderLen() int {
+	return unix.CmsgLen(0)
+}
+
+func controlMessageLen(dataLen int) int {
+	return unix.CmsgLen(dataLen)
+}
+
+func controlMessageSpace(dataLen int) int {
+	return unix.CmsgSpace(dataLen)
+}
diff --git a/vendor/golang.org/x/net/internal/socket/cmsghdr_zos_s390x.go b/vendor/golang.org/x/net/internal/socket/cmsghdr_zos_s390x.go
new file mode 100644
index 0000000000000000000000000000000000000000..98be146bc51dc1f9d2aa9920142d425f354da302
--- /dev/null
+++ b/vendor/golang.org/x/net/internal/socket/cmsghdr_zos_s390x.go
@@ -0,0 +1,25 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package socket
+
+import "syscall"
+
+func (h *cmsghdr) set(l, lvl, typ int) {
+	h.Len = int32(l)
+	h.Level = int32(lvl)
+	h.Type = int32(typ)
+}
+
+func controlHeaderLen() int {
+	return syscall.CmsgLen(0)
+}
+
+func controlMessageLen(dataLen int) int {
+	return syscall.CmsgLen(dataLen)
+}
+
+func controlMessageSpace(dataLen int) int {
+	return syscall.CmsgSpace(dataLen)
+}
diff --git a/vendor/golang.org/x/net/internal/socket/error_unix.go b/vendor/golang.org/x/net/internal/socket/error_unix.go
index f14872d3d35759e76daee6d91ea5dca751ee4b7c..78f4129047e27174604967d82ad9906c2d21ad0d 100644
--- a/vendor/golang.org/x/net/internal/socket/error_unix.go
+++ b/vendor/golang.org/x/net/internal/socket/error_unix.go
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
+//go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris || zos
+// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris zos
 
 package socket
 
diff --git a/vendor/golang.org/x/net/internal/socket/iovec_32bit.go b/vendor/golang.org/x/net/internal/socket/iovec_32bit.go
index 05d6082d147989af51c48729726567321dc97311..1f42d034dcb8e50137ce7f04de93e367ccb04faf 100644
--- a/vendor/golang.org/x/net/internal/socket/iovec_32bit.go
+++ b/vendor/golang.org/x/net/internal/socket/iovec_32bit.go
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build (arm || mips || mipsle || 386) && (darwin || dragonfly || freebsd || linux || netbsd || openbsd)
 // +build arm mips mipsle 386
 // +build darwin dragonfly freebsd linux netbsd openbsd
 
diff --git a/vendor/golang.org/x/net/internal/socket/iovec_64bit.go b/vendor/golang.org/x/net/internal/socket/iovec_64bit.go
index dfeda752be28a34f76af5e7a9facf7cc1eaa2fd4..3dc5def2bc280a3ff8d987a8a1c488eb8f7bbd21 100644
--- a/vendor/golang.org/x/net/internal/socket/iovec_64bit.go
+++ b/vendor/golang.org/x/net/internal/socket/iovec_64bit.go
@@ -2,8 +2,9 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build (arm64 || amd64 || ppc64 || ppc64le || mips64 || mips64le || riscv64 || s390x) && (aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || zos)
 // +build arm64 amd64 ppc64 ppc64le mips64 mips64le riscv64 s390x
-// +build aix darwin dragonfly freebsd linux netbsd openbsd
+// +build aix darwin dragonfly freebsd linux netbsd openbsd zos
 
 package socket
 
diff --git a/vendor/golang.org/x/net/internal/socket/iovec_solaris_64bit.go b/vendor/golang.org/x/net/internal/socket/iovec_solaris_64bit.go
index 8d17a40c4049336a40ca7eb40eed75d540fe30aa..f7da2bc4d4bcd050a7a35d98840f5bce11baa685 100644
--- a/vendor/golang.org/x/net/internal/socket/iovec_solaris_64bit.go
+++ b/vendor/golang.org/x/net/internal/socket/iovec_solaris_64bit.go
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build amd64
-// +build solaris
+//go:build amd64 && solaris
+// +build amd64,solaris
 
 package socket
 
diff --git a/vendor/golang.org/x/net/internal/socket/iovec_stub.go b/vendor/golang.org/x/net/internal/socket/iovec_stub.go
index a746e90e3073f84b16ece519c5156b966f48e2d8..14caf52483eea09e7aded0f509966680b77ccaf4 100644
--- a/vendor/golang.org/x/net/internal/socket/iovec_stub.go
+++ b/vendor/golang.org/x/net/internal/socket/iovec_stub.go
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build !aix,!darwin,!dragonfly,!freebsd,!linux,!netbsd,!openbsd,!solaris
+//go:build !aix && !darwin && !dragonfly && !freebsd && !linux && !netbsd && !openbsd && !solaris && !zos
+// +build !aix,!darwin,!dragonfly,!freebsd,!linux,!netbsd,!openbsd,!solaris,!zos
 
 package socket
 
diff --git a/vendor/golang.org/x/net/internal/socket/mmsghdr_stub.go b/vendor/golang.org/x/net/internal/socket/mmsghdr_stub.go
index 1a7f2792f2548cff6973969665d64229f0f83e43..113e773cd531c6393989d08eef91a2e938a8a6d7 100644
--- a/vendor/golang.org/x/net/internal/socket/mmsghdr_stub.go
+++ b/vendor/golang.org/x/net/internal/socket/mmsghdr_stub.go
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build !aix && !linux && !netbsd
 // +build !aix,!linux,!netbsd
 
 package socket
diff --git a/vendor/golang.org/x/net/internal/socket/mmsghdr_unix.go b/vendor/golang.org/x/net/internal/socket/mmsghdr_unix.go
index f1100683a5791f58658eee6d5156cc2cea9ad414..5025a0f75acdda49371b02f716408bd287196d61 100644
--- a/vendor/golang.org/x/net/internal/socket/mmsghdr_unix.go
+++ b/vendor/golang.org/x/net/internal/socket/mmsghdr_unix.go
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build aix || linux || netbsd
 // +build aix linux netbsd
 
 package socket
diff --git a/vendor/golang.org/x/net/internal/socket/msghdr_bsd.go b/vendor/golang.org/x/net/internal/socket/msghdr_bsd.go
index 77f44c1f129330168fc1c675981f3f026bd88310..25f6847f99a7cb25e7cc9043196e874cc28f6432 100644
--- a/vendor/golang.org/x/net/internal/socket/msghdr_bsd.go
+++ b/vendor/golang.org/x/net/internal/socket/msghdr_bsd.go
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build aix || darwin || dragonfly || freebsd || netbsd || openbsd
 // +build aix darwin dragonfly freebsd netbsd openbsd
 
 package socket
diff --git a/vendor/golang.org/x/net/internal/socket/msghdr_bsdvar.go b/vendor/golang.org/x/net/internal/socket/msghdr_bsdvar.go
index c5562dd66ad9bec09ff325bdf0b5990908cba14e..5b8e00f1cd4bf29784031febc5f86d6baffa2d6f 100644
--- a/vendor/golang.org/x/net/internal/socket/msghdr_bsdvar.go
+++ b/vendor/golang.org/x/net/internal/socket/msghdr_bsdvar.go
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build aix || darwin || dragonfly || freebsd || netbsd
 // +build aix darwin dragonfly freebsd netbsd
 
 package socket
diff --git a/vendor/golang.org/x/net/internal/socket/msghdr_linux_32bit.go b/vendor/golang.org/x/net/internal/socket/msghdr_linux_32bit.go
index a7a5987c88306325e4317ab574a8f351851fa75f..2e09e266996239252c57b26e90b279231be0fe11 100644
--- a/vendor/golang.org/x/net/internal/socket/msghdr_linux_32bit.go
+++ b/vendor/golang.org/x/net/internal/socket/msghdr_linux_32bit.go
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build (arm || mips || mipsle || 386) && linux
 // +build arm mips mipsle 386
 // +build linux
 
diff --git a/vendor/golang.org/x/net/internal/socket/msghdr_linux_64bit.go b/vendor/golang.org/x/net/internal/socket/msghdr_linux_64bit.go
index e731833a262d9095e95486952802021655251db8..c9c592ddb887b88f7208e76b9da9655a5f180db8 100644
--- a/vendor/golang.org/x/net/internal/socket/msghdr_linux_64bit.go
+++ b/vendor/golang.org/x/net/internal/socket/msghdr_linux_64bit.go
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build (arm64 || amd64 || ppc64 || ppc64le || mips64 || mips64le || riscv64 || s390x) && linux
 // +build arm64 amd64 ppc64 ppc64le mips64 mips64le riscv64 s390x
 // +build linux
 
diff --git a/vendor/golang.org/x/net/internal/socket/msghdr_solaris_64bit.go b/vendor/golang.org/x/net/internal/socket/msghdr_solaris_64bit.go
index 6465b2073243db58b5233a15cc1a2d3221c55e32..3098f5d783def0622a7b6f665ad02cb135b3994f 100644
--- a/vendor/golang.org/x/net/internal/socket/msghdr_solaris_64bit.go
+++ b/vendor/golang.org/x/net/internal/socket/msghdr_solaris_64bit.go
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build amd64
-// +build solaris
+//go:build amd64 && solaris
+// +build amd64,solaris
 
 package socket
 
diff --git a/vendor/golang.org/x/net/internal/socket/msghdr_stub.go b/vendor/golang.org/x/net/internal/socket/msghdr_stub.go
index 873490a7ae9d4b6836c6b7f8d00c32462da129e8..eb79151f6ae134f90166a41bee13f96f40b525d0 100644
--- a/vendor/golang.org/x/net/internal/socket/msghdr_stub.go
+++ b/vendor/golang.org/x/net/internal/socket/msghdr_stub.go
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build !aix,!darwin,!dragonfly,!freebsd,!linux,!netbsd,!openbsd,!solaris
+//go:build !aix && !darwin && !dragonfly && !freebsd && !linux && !netbsd && !openbsd && !solaris && !zos
+// +build !aix,!darwin,!dragonfly,!freebsd,!linux,!netbsd,!openbsd,!solaris,!zos
 
 package socket
 
diff --git a/vendor/golang.org/x/net/internal/socket/msghdr_zos_s390x.go b/vendor/golang.org/x/net/internal/socket/msghdr_zos_s390x.go
new file mode 100644
index 0000000000000000000000000000000000000000..324e9ee7d1ecf3a0189fb322efd40bef60406eb8
--- /dev/null
+++ b/vendor/golang.org/x/net/internal/socket/msghdr_zos_s390x.go
@@ -0,0 +1,36 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build s390x && zos
+// +build s390x,zos
+
+package socket
+
+import "unsafe"
+
+func (h *msghdr) pack(vs []iovec, bs [][]byte, oob []byte, sa []byte) {
+	for i := range vs {
+		vs[i].set(bs[i])
+	}
+	if len(vs) > 0 {
+		h.Iov = &vs[0]
+		h.Iovlen = int32(len(vs))
+	}
+	if len(oob) > 0 {
+		h.Control = (*byte)(unsafe.Pointer(&oob[0]))
+		h.Controllen = uint32(len(oob))
+	}
+	if sa != nil {
+		h.Name = (*byte)(unsafe.Pointer(&sa[0]))
+		h.Namelen = uint32(len(sa))
+	}
+}
+
+func (h *msghdr) controllen() int {
+	return int(h.Controllen)
+}
+
+func (h *msghdr) flags() int {
+	return int(h.Flags)
+}
diff --git a/vendor/golang.org/x/net/internal/socket/norace.go b/vendor/golang.org/x/net/internal/socket/norace.go
index 9519ffbba47e930b334f8e59f1e8b0e2b865cef9..de0ad420fc5291de89b10bfaa364ce6796c93594 100644
--- a/vendor/golang.org/x/net/internal/socket/norace.go
+++ b/vendor/golang.org/x/net/internal/socket/norace.go
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build !race
 // +build !race
 
 package socket
diff --git a/vendor/golang.org/x/net/internal/socket/race.go b/vendor/golang.org/x/net/internal/socket/race.go
index df60c62fff54a51e8c067478ad04db3bb633eaa2..f0a28a625d0811139e43f3773ecf21bfb1e9306d 100644
--- a/vendor/golang.org/x/net/internal/socket/race.go
+++ b/vendor/golang.org/x/net/internal/socket/race.go
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build race
 // +build race
 
 package socket
diff --git a/vendor/golang.org/x/net/internal/socket/rawconn_mmsg.go b/vendor/golang.org/x/net/internal/socket/rawconn_mmsg.go
index d01fc4c7da2511e820241c2ce0090c58c61b157d..5d90de1183588c4bac887c4efc12cd8721f4894f 100644
--- a/vendor/golang.org/x/net/internal/socket/rawconn_mmsg.go
+++ b/vendor/golang.org/x/net/internal/socket/rawconn_mmsg.go
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build linux
 // +build linux
 
 package socket
diff --git a/vendor/golang.org/x/net/internal/socket/rawconn_msg.go b/vendor/golang.org/x/net/internal/socket/rawconn_msg.go
index d5ae3f8e143d24baa003ab3ccc2beee33b1d47a2..dfed9a8da3389030ef7ab5cad28f2162203b33c3 100644
--- a/vendor/golang.org/x/net/internal/socket/rawconn_msg.go
+++ b/vendor/golang.org/x/net/internal/socket/rawconn_msg.go
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris windows
+//go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris || windows || zos
+// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris windows zos
 
 package socket
 
@@ -24,7 +25,7 @@ func (c *Conn) recvMsg(m *Message, flags int) error {
 	var n int
 	fn := func(s uintptr) bool {
 		n, operr = recvmsg(s, &h, flags)
-		if operr == syscall.EAGAIN {
+		if operr == syscall.EAGAIN || operr == syscall.EWOULDBLOCK {
 			return false
 		}
 		return true
@@ -61,7 +62,7 @@ func (c *Conn) sendMsg(m *Message, flags int) error {
 	var n int
 	fn := func(s uintptr) bool {
 		n, operr = sendmsg(s, &h, flags)
-		if operr == syscall.EAGAIN {
+		if operr == syscall.EAGAIN || operr == syscall.EWOULDBLOCK {
 			return false
 		}
 		return true
diff --git a/vendor/golang.org/x/net/internal/socket/rawconn_nommsg.go b/vendor/golang.org/x/net/internal/socket/rawconn_nommsg.go
index fe5bb942ba69d93bbb521605ff9481582e23d6db..02f32855660a10cc3303680bb0b6062d23bf3743 100644
--- a/vendor/golang.org/x/net/internal/socket/rawconn_nommsg.go
+++ b/vendor/golang.org/x/net/internal/socket/rawconn_nommsg.go
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build !linux
 // +build !linux
 
 package socket
diff --git a/vendor/golang.org/x/net/internal/socket/rawconn_nomsg.go b/vendor/golang.org/x/net/internal/socket/rawconn_nomsg.go
index b8cea6fe5343c7c319411507fce4fa474e86a9d7..dd785877b66b107238431bb1261ed87c711b6933 100644
--- a/vendor/golang.org/x/net/internal/socket/rawconn_nomsg.go
+++ b/vendor/golang.org/x/net/internal/socket/rawconn_nomsg.go
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build !aix,!darwin,!dragonfly,!freebsd,!linux,!netbsd,!openbsd,!solaris,!windows
+//go:build !aix && !darwin && !dragonfly && !freebsd && !linux && !netbsd && !openbsd && !solaris && !windows && !zos
+// +build !aix,!darwin,!dragonfly,!freebsd,!linux,!netbsd,!openbsd,!solaris,!windows,!zos
 
 package socket
 
diff --git a/vendor/golang.org/x/net/internal/socket/socket.go b/vendor/golang.org/x/net/internal/socket/socket.go
index 23571b8d4dc6efa55dd78d5fc59247458589fcd4..dba47bf12b95d433697f69d669fcdf542ccaa5b6 100644
--- a/vendor/golang.org/x/net/internal/socket/socket.go
+++ b/vendor/golang.org/x/net/internal/socket/socket.go
@@ -90,17 +90,9 @@ func (o *Option) SetInt(c *Conn, v int) error {
 	return o.set(c, b)
 }
 
-func controlHeaderLen() int {
-	return roundup(sizeofCmsghdr)
-}
-
-func controlMessageLen(dataLen int) int {
-	return roundup(sizeofCmsghdr) + dataLen
-}
-
 // ControlMessageSpace returns the whole length of control message.
 func ControlMessageSpace(dataLen int) int {
-	return roundup(sizeofCmsghdr) + roundup(dataLen)
+	return controlMessageSpace(dataLen)
 }
 
 // A ControlMessage represents the head message in a stream of control
diff --git a/vendor/golang.org/x/net/internal/socket/sys.go b/vendor/golang.org/x/net/internal/socket/sys.go
index ee492ba86b124df0e0d7771693a4008e87871b1d..4a26af186346a5b56ca776f7b2faa6df94999110 100644
--- a/vendor/golang.org/x/net/internal/socket/sys.go
+++ b/vendor/golang.org/x/net/internal/socket/sys.go
@@ -9,13 +9,8 @@ import (
 	"unsafe"
 )
 
-var (
-	// NativeEndian is the machine native endian implementation of
-	// ByteOrder.
-	NativeEndian binary.ByteOrder
-
-	kernelAlign int
-)
+// NativeEndian is the machine native endian implementation of ByteOrder.
+var NativeEndian binary.ByteOrder
 
 func init() {
 	i := uint32(1)
@@ -25,9 +20,4 @@ func init() {
 	} else {
 		NativeEndian = binary.BigEndian
 	}
-	kernelAlign = probeProtocolStack()
-}
-
-func roundup(l int) int {
-	return (l + kernelAlign - 1) &^ (kernelAlign - 1)
 }
diff --git a/vendor/golang.org/x/net/internal/socket/sys_bsd.go b/vendor/golang.org/x/net/internal/socket/sys_bsd.go
index d432835b4195d17a8c196769cac5a9fce371cdba..b6cd77088d59da952f3a2ca3b8248048dcf4123f 100644
--- a/vendor/golang.org/x/net/internal/socket/sys_bsd.go
+++ b/vendor/golang.org/x/net/internal/socket/sys_bsd.go
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build aix || darwin || dragonfly || freebsd || openbsd
 // +build aix darwin dragonfly freebsd openbsd
 
 package socket
diff --git a/vendor/golang.org/x/net/internal/socket/sys_bsdvar.go b/vendor/golang.org/x/net/internal/socket/sys_bsdvar.go
deleted file mode 100644
index b4f41b5522f913c9317fc7a09531e5f3a9b18e9d..0000000000000000000000000000000000000000
--- a/vendor/golang.org/x/net/internal/socket/sys_bsdvar.go
+++ /dev/null
@@ -1,23 +0,0 @@
-// Copyright 2017 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// +build aix freebsd netbsd openbsd
-
-package socket
-
-import (
-	"runtime"
-	"unsafe"
-)
-
-func probeProtocolStack() int {
-	if (runtime.GOOS == "netbsd" || runtime.GOOS == "openbsd") && runtime.GOARCH == "arm" {
-		return 8
-	}
-	if runtime.GOOS == "aix" {
-		return 1
-	}
-	var p uintptr
-	return int(unsafe.Sizeof(p))
-}
diff --git a/vendor/golang.org/x/net/internal/socket/sys_const_unix.go b/vendor/golang.org/x/net/internal/socket/sys_const_unix.go
index 43797d6e535331c851e41bc90460495d27899bf1..f077b2f11fea3d936690e56bb6382a1d556ec2b2 100644
--- a/vendor/golang.org/x/net/internal/socket/sys_const_unix.go
+++ b/vendor/golang.org/x/net/internal/socket/sys_const_unix.go
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris
 // +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
 
 package socket
diff --git a/vendor/golang.org/x/net/internal/socket/sys_const_zos.go b/vendor/golang.org/x/net/internal/socket/sys_const_zos.go
new file mode 100644
index 0000000000000000000000000000000000000000..3048629541b5ae2f6f6bc9d8d88b2666f68c8ded
--- /dev/null
+++ b/vendor/golang.org/x/net/internal/socket/sys_const_zos.go
@@ -0,0 +1,18 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build zos
+// +build zos
+
+package socket
+
+import "syscall"
+
+const (
+	sysAF_UNSPEC = syscall.AF_UNSPEC
+	sysAF_INET   = syscall.AF_INET
+	sysAF_INET6  = syscall.AF_INET6
+
+	sysSOCK_RAW = syscall.SOCK_RAW
+)
diff --git a/vendor/golang.org/x/net/internal/socket/sys_darwin.go b/vendor/golang.org/x/net/internal/socket/sys_darwin.go
deleted file mode 100644
index b17d223bff2013ae39c8fc4d22c33afe8b92789c..0000000000000000000000000000000000000000
--- a/vendor/golang.org/x/net/internal/socket/sys_darwin.go
+++ /dev/null
@@ -1,7 +0,0 @@
-// Copyright 2017 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package socket
-
-func probeProtocolStack() int { return 4 }
diff --git a/vendor/golang.org/x/net/internal/socket/sys_dragonfly.go b/vendor/golang.org/x/net/internal/socket/sys_dragonfly.go
deleted file mode 100644
index ed0448fe985119b1751ebf175e0f5e7a15a9eccd..0000000000000000000000000000000000000000
--- a/vendor/golang.org/x/net/internal/socket/sys_dragonfly.go
+++ /dev/null
@@ -1,32 +0,0 @@
-// Copyright 2017 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package socket
-
-import (
-	"sync"
-	"syscall"
-	"unsafe"
-)
-
-// See version list in https://github.com/DragonFlyBSD/DragonFlyBSD/blob/master/sys/sys/param.h
-var (
-	osreldateOnce sync.Once
-	osreldate     uint32
-)
-
-// First __DragonFly_version after September 2019 ABI changes
-// http://lists.dragonflybsd.org/pipermail/users/2019-September/358280.html
-const _dragonflyABIChangeVersion = 500705
-
-func probeProtocolStack() int {
-	osreldateOnce.Do(func() { osreldate, _ = syscall.SysctlUint32("kern.osreldate") })
-	var p uintptr
-	if int(unsafe.Sizeof(p)) == 8 && osreldate >= _dragonflyABIChangeVersion {
-		return int(unsafe.Sizeof(p))
-	}
-	// 64-bit Dragonfly before the September 2019 ABI changes still requires
-	// 32-bit aligned access to network subsystem.
-	return 4
-}
diff --git a/vendor/golang.org/x/net/internal/socket/sys_linkname.go b/vendor/golang.org/x/net/internal/socket/sys_linkname.go
index 61c3f38a51b34b0c9bb2cf77b1ae828f551ba166..21734af4b85da09bfca321be83525d2756b5a408 100644
--- a/vendor/golang.org/x/net/internal/socket/sys_linkname.go
+++ b/vendor/golang.org/x/net/internal/socket/sys_linkname.go
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build aix || (go1.12 && darwin)
 // +build aix go1.12,darwin
 
 package socket
diff --git a/vendor/golang.org/x/net/internal/socket/sys_linux.go b/vendor/golang.org/x/net/internal/socket/sys_linux.go
index 1559521e0382084f61c334c2ecc572a5e93b34e4..76f5b8ae5d5de77451be9d80eb449c026393f158 100644
--- a/vendor/golang.org/x/net/internal/socket/sys_linux.go
+++ b/vendor/golang.org/x/net/internal/socket/sys_linux.go
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build linux && !s390x && !386
 // +build linux,!s390x,!386
 
 package socket
@@ -11,11 +12,6 @@ import (
 	"unsafe"
 )
 
-func probeProtocolStack() int {
-	var p uintptr
-	return int(unsafe.Sizeof(p))
-}
-
 func recvmmsg(s uintptr, hs []mmsghdr, flags int) (int, error) {
 	n, _, errno := syscall.Syscall6(sysRECVMMSG, s, uintptr(unsafe.Pointer(&hs[0])), uintptr(len(hs)), uintptr(flags), 0, 0)
 	return int(n), errnoErr(errno)
diff --git a/vendor/golang.org/x/net/internal/socket/sys_linux_386.go b/vendor/golang.org/x/net/internal/socket/sys_linux_386.go
index 235b2cc08a607e571b27a315d6ffa0a02206b2bd..651215321bc8e53461754d114ff7a5f7a11f4409 100644
--- a/vendor/golang.org/x/net/internal/socket/sys_linux_386.go
+++ b/vendor/golang.org/x/net/internal/socket/sys_linux_386.go
@@ -9,8 +9,6 @@ import (
 	"unsafe"
 )
 
-func probeProtocolStack() int { return 4 }
-
 const (
 	sysSETSOCKOPT = 0xe
 	sysGETSOCKOPT = 0xf
diff --git a/vendor/golang.org/x/net/internal/socket/sys_linux_riscv64.go b/vendor/golang.org/x/net/internal/socket/sys_linux_riscv64.go
index 64f69f1dc559d15c90e6263053f65d945473d8d5..5b128fbb2a2c6193dea04f76aabcee2db3ff5dc5 100644
--- a/vendor/golang.org/x/net/internal/socket/sys_linux_riscv64.go
+++ b/vendor/golang.org/x/net/internal/socket/sys_linux_riscv64.go
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build riscv64
 // +build riscv64
 
 package socket
diff --git a/vendor/golang.org/x/net/internal/socket/sys_linux_s390x.go b/vendor/golang.org/x/net/internal/socket/sys_linux_s390x.go
index 327979efbb49b0b36abdb09371f35d9eeb14c2bb..651215321bc8e53461754d114ff7a5f7a11f4409 100644
--- a/vendor/golang.org/x/net/internal/socket/sys_linux_s390x.go
+++ b/vendor/golang.org/x/net/internal/socket/sys_linux_s390x.go
@@ -9,8 +9,6 @@ import (
 	"unsafe"
 )
 
-func probeProtocolStack() int { return 8 }
-
 const (
 	sysSETSOCKOPT = 0xe
 	sysGETSOCKOPT = 0xf
diff --git a/vendor/golang.org/x/net/internal/socket/sys_posix.go b/vendor/golang.org/x/net/internal/socket/sys_posix.go
index 22eae809c9e12ff77c1331d460e0876bb33f4098..25ded21763ad46fe9667c74bb8ff9352ac678341 100644
--- a/vendor/golang.org/x/net/internal/socket/sys_posix.go
+++ b/vendor/golang.org/x/net/internal/socket/sys_posix.go
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris windows
+//go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris || windows || zos
+// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris windows zos
 
 package socket
 
diff --git a/vendor/golang.org/x/net/internal/socket/sys_solaris.go b/vendor/golang.org/x/net/internal/socket/sys_solaris.go
index 66b5547868ccb00163f3b011bcb0f8a2b6c5a232..e79ca95183abd80be2b8cf9d0fc11ebaacedaadc 100644
--- a/vendor/golang.org/x/net/internal/socket/sys_solaris.go
+++ b/vendor/golang.org/x/net/internal/socket/sys_solaris.go
@@ -5,21 +5,10 @@
 package socket
 
 import (
-	"runtime"
 	"syscall"
 	"unsafe"
 )
 
-func probeProtocolStack() int {
-	switch runtime.GOARCH {
-	case "amd64":
-		return 4
-	default:
-		var p uintptr
-		return int(unsafe.Sizeof(p))
-	}
-}
-
 //go:cgo_import_dynamic libc___xnet_getsockopt __xnet_getsockopt "libsocket.so"
 //go:cgo_import_dynamic libc_setsockopt setsockopt "libsocket.so"
 //go:cgo_import_dynamic libc___xnet_recvmsg __xnet_recvmsg "libsocket.so"
diff --git a/vendor/golang.org/x/net/internal/socket/sys_stub.go b/vendor/golang.org/x/net/internal/socket/sys_stub.go
index 0f61742628164364707a8811b52885e1a8dff863..dc7bb389b3c31b6385ec872837cb829051c05f01 100644
--- a/vendor/golang.org/x/net/internal/socket/sys_stub.go
+++ b/vendor/golang.org/x/net/internal/socket/sys_stub.go
@@ -2,15 +2,12 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build !aix,!darwin,!dragonfly,!freebsd,!linux,!netbsd,!openbsd,!solaris,!windows
+//go:build !aix && !darwin && !dragonfly && !freebsd && !linux && !netbsd && !openbsd && !solaris && !windows && !zos
+// +build !aix,!darwin,!dragonfly,!freebsd,!linux,!netbsd,!openbsd,!solaris,!windows,!zos
 
 package socket
 
-import (
-	"net"
-	"runtime"
-	"unsafe"
-)
+import "net"
 
 const (
 	sysAF_UNSPEC = 0x0
@@ -20,16 +17,6 @@ const (
 	sysSOCK_RAW = 0x3
 )
 
-func probeProtocolStack() int {
-	switch runtime.GOARCH {
-	case "amd64p32", "mips64p32":
-		return 4
-	default:
-		var p uintptr
-		return int(unsafe.Sizeof(p))
-	}
-}
-
 func marshalInetAddr(ip net.IP, port int, zone string) []byte {
 	return nil
 }
diff --git a/vendor/golang.org/x/net/internal/socket/sys_unix.go b/vendor/golang.org/x/net/internal/socket/sys_unix.go
index 0eb71283f52f24809e0cade5092cea90a616f109..c98ebae548c4c34c35af63dde965fce62462c8f5 100644
--- a/vendor/golang.org/x/net/internal/socket/sys_unix.go
+++ b/vendor/golang.org/x/net/internal/socket/sys_unix.go
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build dragonfly || freebsd || (linux && !s390x && !386) || netbsd || openbsd
 // +build dragonfly freebsd linux,!s390x,!386 netbsd openbsd
 
 package socket
diff --git a/vendor/golang.org/x/net/internal/socket/sys_go1_11_darwin.go b/vendor/golang.org/x/net/internal/socket/sys_zos_s390x.go
similarity index 52%
rename from vendor/golang.org/x/net/internal/socket/sys_go1_11_darwin.go
rename to vendor/golang.org/x/net/internal/socket/sys_zos_s390x.go
index 02d2b3cc83579d3ccaf437146b6beb212c8cae90..1e38b9223281f24b4d27841db6ea867c97af0691 100644
--- a/vendor/golang.org/x/net/internal/socket/sys_go1_11_darwin.go
+++ b/vendor/golang.org/x/net/internal/socket/sys_zos_s390x.go
@@ -1,9 +1,7 @@
-// Copyright 2018 The Go Authors. All rights reserved.
+// Copyright 2020 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build !go1.12
-
 package socket
 
 import (
@@ -11,23 +9,30 @@ import (
 	"unsafe"
 )
 
+func syscall_syscall(trap, a1, a2, a3 uintptr) (r1, r2 uintptr, err syscall.Errno)
+func syscall_syscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2 uintptr, err syscall.Errno)
+
+func probeProtocolStack() int {
+	return 4 // sizeof(int) on GOOS=zos GOARCH=s390x
+}
+
 func getsockopt(s uintptr, level, name int, b []byte) (int, error) {
 	l := uint32(len(b))
-	_, _, errno := syscall.Syscall6(syscall.SYS_GETSOCKOPT, s, uintptr(level), uintptr(name), uintptr(unsafe.Pointer(&b[0])), uintptr(unsafe.Pointer(&l)), 0)
+	_, _, errno := syscall_syscall6(syscall.SYS_GETSOCKOPT, s, uintptr(level), uintptr(name), uintptr(unsafe.Pointer(&b[0])), uintptr(unsafe.Pointer(&l)), 0)
 	return int(l), errnoErr(errno)
 }
 
 func setsockopt(s uintptr, level, name int, b []byte) error {
-	_, _, errno := syscall.Syscall6(syscall.SYS_SETSOCKOPT, s, uintptr(level), uintptr(name), uintptr(unsafe.Pointer(&b[0])), uintptr(len(b)), 0)
+	_, _, errno := syscall_syscall6(syscall.SYS_SETSOCKOPT, s, uintptr(level), uintptr(name), uintptr(unsafe.Pointer(&b[0])), uintptr(len(b)), 0)
 	return errnoErr(errno)
 }
 
 func recvmsg(s uintptr, h *msghdr, flags int) (int, error) {
-	n, _, errno := syscall.Syscall(syscall.SYS_RECVMSG, s, uintptr(unsafe.Pointer(h)), uintptr(flags))
+	n, _, errno := syscall_syscall(syscall.SYS___RECVMSG_A, s, uintptr(unsafe.Pointer(h)), uintptr(flags))
 	return int(n), errnoErr(errno)
 }
 
 func sendmsg(s uintptr, h *msghdr, flags int) (int, error) {
-	n, _, errno := syscall.Syscall(syscall.SYS_SENDMSG, s, uintptr(unsafe.Pointer(h)), uintptr(flags))
+	n, _, errno := syscall_syscall(syscall.SYS___SENDMSG_A, s, uintptr(unsafe.Pointer(h)), uintptr(flags))
 	return int(n), errnoErr(errno)
 }
diff --git a/vendor/golang.org/x/net/internal/socket/sys_zos_s390x.s b/vendor/golang.org/x/net/internal/socket/sys_zos_s390x.s
new file mode 100644
index 0000000000000000000000000000000000000000..60d5839c25b65198bd494c2ab6a422008f78a855
--- /dev/null
+++ b/vendor/golang.org/x/net/internal/socket/sys_zos_s390x.s
@@ -0,0 +1,11 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#include "textflag.h"
+
+TEXT ·syscall_syscall(SB),NOSPLIT,$0
+        JMP     syscall·_syscall(SB)
+
+TEXT ·syscall_syscall6(SB),NOSPLIT,$0
+        JMP     syscall·_syscall6(SB)
diff --git a/vendor/golang.org/x/net/internal/socket/zsys_aix_ppc64.go b/vendor/golang.org/x/net/internal/socket/zsys_aix_ppc64.go
index e740c8f024c0f7f315e107f789c46bdeb5a8ae08..79f3bdd5b9d2aff6a3dff8808cb2c9b532c9efcf 100644
--- a/vendor/golang.org/x/net/internal/socket/zsys_aix_ppc64.go
+++ b/vendor/golang.org/x/net/internal/socket/zsys_aix_ppc64.go
@@ -2,6 +2,7 @@
 // cgo -godefs defs_aix.go
 
 // Added for go1.11 compatibility
+//go:build aix
 // +build aix
 
 package socket
@@ -51,9 +52,8 @@ type sockaddrInet6 struct {
 }
 
 const (
-	sizeofIovec   = 0x10
-	sizeofMsghdr  = 0x30
-	sizeofCmsghdr = 0xc
+	sizeofIovec  = 0x10
+	sizeofMsghdr = 0x30
 
 	sizeofSockaddrInet  = 0x10
 	sizeofSockaddrInet6 = 0x1c
diff --git a/vendor/golang.org/x/net/internal/socket/zsys_darwin_386.go b/vendor/golang.org/x/net/internal/socket/zsys_darwin_386.go
index 083bda51c3c06ad88b785f1a9de829866801b9b1..150f980f527b2017c8be130ac6d71abc19a5ef3d 100644
--- a/vendor/golang.org/x/net/internal/socket/zsys_darwin_386.go
+++ b/vendor/golang.org/x/net/internal/socket/zsys_darwin_386.go
@@ -42,9 +42,8 @@ type sockaddrInet6 struct {
 }
 
 const (
-	sizeofIovec   = 0x8
-	sizeofMsghdr  = 0x1c
-	sizeofCmsghdr = 0xc
+	sizeofIovec  = 0x8
+	sizeofMsghdr = 0x1c
 
 	sizeofSockaddrInet  = 0x10
 	sizeofSockaddrInet6 = 0x1c
diff --git a/vendor/golang.org/x/net/internal/socket/zsys_darwin_amd64.go b/vendor/golang.org/x/net/internal/socket/zsys_darwin_amd64.go
index 55c6c9f5770ce41cdfc0250bf4fb36e7571167d3..a686c952855ba42cf78a504530ed95e8e82a2684 100644
--- a/vendor/golang.org/x/net/internal/socket/zsys_darwin_amd64.go
+++ b/vendor/golang.org/x/net/internal/socket/zsys_darwin_amd64.go
@@ -44,9 +44,8 @@ type sockaddrInet6 struct {
 }
 
 const (
-	sizeofIovec   = 0x10
-	sizeofMsghdr  = 0x30
-	sizeofCmsghdr = 0xc
+	sizeofIovec  = 0x10
+	sizeofMsghdr = 0x30
 
 	sizeofSockaddrInet  = 0x10
 	sizeofSockaddrInet6 = 0x1c
diff --git a/vendor/golang.org/x/net/internal/socket/zsys_darwin_arm.go b/vendor/golang.org/x/net/internal/socket/zsys_darwin_arm.go
index 083bda51c3c06ad88b785f1a9de829866801b9b1..150f980f527b2017c8be130ac6d71abc19a5ef3d 100644
--- a/vendor/golang.org/x/net/internal/socket/zsys_darwin_arm.go
+++ b/vendor/golang.org/x/net/internal/socket/zsys_darwin_arm.go
@@ -42,9 +42,8 @@ type sockaddrInet6 struct {
 }
 
 const (
-	sizeofIovec   = 0x8
-	sizeofMsghdr  = 0x1c
-	sizeofCmsghdr = 0xc
+	sizeofIovec  = 0x8
+	sizeofMsghdr = 0x1c
 
 	sizeofSockaddrInet  = 0x10
 	sizeofSockaddrInet6 = 0x1c
diff --git a/vendor/golang.org/x/net/internal/socket/zsys_darwin_arm64.go b/vendor/golang.org/x/net/internal/socket/zsys_darwin_arm64.go
index 55c6c9f5770ce41cdfc0250bf4fb36e7571167d3..a686c952855ba42cf78a504530ed95e8e82a2684 100644
--- a/vendor/golang.org/x/net/internal/socket/zsys_darwin_arm64.go
+++ b/vendor/golang.org/x/net/internal/socket/zsys_darwin_arm64.go
@@ -44,9 +44,8 @@ type sockaddrInet6 struct {
 }
 
 const (
-	sizeofIovec   = 0x10
-	sizeofMsghdr  = 0x30
-	sizeofCmsghdr = 0xc
+	sizeofIovec  = 0x10
+	sizeofMsghdr = 0x30
 
 	sizeofSockaddrInet  = 0x10
 	sizeofSockaddrInet6 = 0x1c
diff --git a/vendor/golang.org/x/net/internal/socket/zsys_dragonfly_amd64.go b/vendor/golang.org/x/net/internal/socket/zsys_dragonfly_amd64.go
index 8b7d161d7d52aec930b81432d9f4d07595506459..d45c197e26df32470b0dd5ae767b977aa38e884c 100644
--- a/vendor/golang.org/x/net/internal/socket/zsys_dragonfly_amd64.go
+++ b/vendor/golang.org/x/net/internal/socket/zsys_dragonfly_amd64.go
@@ -44,9 +44,8 @@ type sockaddrInet6 struct {
 }
 
 const (
-	sizeofIovec   = 0x10
-	sizeofMsghdr  = 0x30
-	sizeofCmsghdr = 0xc
+	sizeofIovec  = 0x10
+	sizeofMsghdr = 0x30
 
 	sizeofSockaddrInet  = 0x10
 	sizeofSockaddrInet6 = 0x1c
diff --git a/vendor/golang.org/x/net/internal/socket/zsys_freebsd_386.go b/vendor/golang.org/x/net/internal/socket/zsys_freebsd_386.go
index 3e71ff57438e9ff90eb8ffea986a2fe6db3ffbd9..ffec860ea8279779e62a7ad6aa2df16e677810d1 100644
--- a/vendor/golang.org/x/net/internal/socket/zsys_freebsd_386.go
+++ b/vendor/golang.org/x/net/internal/socket/zsys_freebsd_386.go
@@ -42,9 +42,8 @@ type sockaddrInet6 struct {
 }
 
 const (
-	sizeofIovec   = 0x8
-	sizeofMsghdr  = 0x1c
-	sizeofCmsghdr = 0xc
+	sizeofIovec  = 0x8
+	sizeofMsghdr = 0x1c
 
 	sizeofSockaddrInet  = 0x10
 	sizeofSockaddrInet6 = 0x1c
diff --git a/vendor/golang.org/x/net/internal/socket/zsys_freebsd_amd64.go b/vendor/golang.org/x/net/internal/socket/zsys_freebsd_amd64.go
index 238d90de6266c23e2a2c7a346bd0da8b29edaad5..aa701ab67677de753979e94370bafc448ba06bdc 100644
--- a/vendor/golang.org/x/net/internal/socket/zsys_freebsd_amd64.go
+++ b/vendor/golang.org/x/net/internal/socket/zsys_freebsd_amd64.go
@@ -44,9 +44,8 @@ type sockaddrInet6 struct {
 }
 
 const (
-	sizeofIovec   = 0x10
-	sizeofMsghdr  = 0x30
-	sizeofCmsghdr = 0xc
+	sizeofIovec  = 0x10
+	sizeofMsghdr = 0x30
 
 	sizeofSockaddrInet  = 0x10
 	sizeofSockaddrInet6 = 0x1c
diff --git a/vendor/golang.org/x/net/internal/socket/zsys_freebsd_arm.go b/vendor/golang.org/x/net/internal/socket/zsys_freebsd_arm.go
index 3e71ff57438e9ff90eb8ffea986a2fe6db3ffbd9..ffec860ea8279779e62a7ad6aa2df16e677810d1 100644
--- a/vendor/golang.org/x/net/internal/socket/zsys_freebsd_arm.go
+++ b/vendor/golang.org/x/net/internal/socket/zsys_freebsd_arm.go
@@ -42,9 +42,8 @@ type sockaddrInet6 struct {
 }
 
 const (
-	sizeofIovec   = 0x8
-	sizeofMsghdr  = 0x1c
-	sizeofCmsghdr = 0xc
+	sizeofIovec  = 0x8
+	sizeofMsghdr = 0x1c
 
 	sizeofSockaddrInet  = 0x10
 	sizeofSockaddrInet6 = 0x1c
diff --git a/vendor/golang.org/x/net/internal/socket/zsys_freebsd_arm64.go b/vendor/golang.org/x/net/internal/socket/zsys_freebsd_arm64.go
index 238d90de6266c23e2a2c7a346bd0da8b29edaad5..aa701ab67677de753979e94370bafc448ba06bdc 100644
--- a/vendor/golang.org/x/net/internal/socket/zsys_freebsd_arm64.go
+++ b/vendor/golang.org/x/net/internal/socket/zsys_freebsd_arm64.go
@@ -44,9 +44,8 @@ type sockaddrInet6 struct {
 }
 
 const (
-	sizeofIovec   = 0x10
-	sizeofMsghdr  = 0x30
-	sizeofCmsghdr = 0xc
+	sizeofIovec  = 0x10
+	sizeofMsghdr = 0x30
 
 	sizeofSockaddrInet  = 0x10
 	sizeofSockaddrInet6 = 0x1c
diff --git a/vendor/golang.org/x/net/internal/socket/zsys_linux_386.go b/vendor/golang.org/x/net/internal/socket/zsys_linux_386.go
index d33025b70db028db8678abc5b109d0bef6d37904..0c847bee7a46fabe3bc52b495aa682a93602a176 100644
--- a/vendor/golang.org/x/net/internal/socket/zsys_linux_386.go
+++ b/vendor/golang.org/x/net/internal/socket/zsys_linux_386.go
@@ -45,9 +45,8 @@ type sockaddrInet6 struct {
 }
 
 const (
-	sizeofIovec   = 0x8
-	sizeofMsghdr  = 0x1c
-	sizeofCmsghdr = 0xc
+	sizeofIovec  = 0x8
+	sizeofMsghdr = 0x1c
 
 	sizeofSockaddrInet  = 0x10
 	sizeofSockaddrInet6 = 0x1c
diff --git a/vendor/golang.org/x/net/internal/socket/zsys_linux_amd64.go b/vendor/golang.org/x/net/internal/socket/zsys_linux_amd64.go
index b20d21677490ee1d3d82c7e1cf8394007ab6bb74..15e2aecaabaec58d7e19f5ca44498cdc9173e0de 100644
--- a/vendor/golang.org/x/net/internal/socket/zsys_linux_amd64.go
+++ b/vendor/golang.org/x/net/internal/socket/zsys_linux_amd64.go
@@ -48,9 +48,8 @@ type sockaddrInet6 struct {
 }
 
 const (
-	sizeofIovec   = 0x10
-	sizeofMsghdr  = 0x38
-	sizeofCmsghdr = 0x10
+	sizeofIovec  = 0x10
+	sizeofMsghdr = 0x38
 
 	sizeofSockaddrInet  = 0x10
 	sizeofSockaddrInet6 = 0x1c
diff --git a/vendor/golang.org/x/net/internal/socket/zsys_linux_arm.go b/vendor/golang.org/x/net/internal/socket/zsys_linux_arm.go
index 1bb10a4289fff8917c07320c9f79e0927709476c..0c847bee7a46fabe3bc52b495aa682a93602a176 100644
--- a/vendor/golang.org/x/net/internal/socket/zsys_linux_arm.go
+++ b/vendor/golang.org/x/net/internal/socket/zsys_linux_arm.go
@@ -48,8 +48,6 @@ const (
 	sizeofIovec  = 0x8
 	sizeofMsghdr = 0x1c
 
-	sizeofCmsghdr = 0xc
-
 	sizeofSockaddrInet  = 0x10
 	sizeofSockaddrInet6 = 0x1c
 )
diff --git a/vendor/golang.org/x/net/internal/socket/zsys_linux_arm64.go b/vendor/golang.org/x/net/internal/socket/zsys_linux_arm64.go
index 7f6e8a7fa4de2a5281b167bace367ce1863ce522..15e2aecaabaec58d7e19f5ca44498cdc9173e0de 100644
--- a/vendor/golang.org/x/net/internal/socket/zsys_linux_arm64.go
+++ b/vendor/golang.org/x/net/internal/socket/zsys_linux_arm64.go
@@ -51,8 +51,6 @@ const (
 	sizeofIovec  = 0x10
 	sizeofMsghdr = 0x38
 
-	sizeofCmsghdr = 0x10
-
 	sizeofSockaddrInet  = 0x10
 	sizeofSockaddrInet6 = 0x1c
 )
diff --git a/vendor/golang.org/x/net/internal/socket/zsys_linux_mips.go b/vendor/golang.org/x/net/internal/socket/zsys_linux_mips.go
index 1bb10a4289fff8917c07320c9f79e0927709476c..0c847bee7a46fabe3bc52b495aa682a93602a176 100644
--- a/vendor/golang.org/x/net/internal/socket/zsys_linux_mips.go
+++ b/vendor/golang.org/x/net/internal/socket/zsys_linux_mips.go
@@ -48,8 +48,6 @@ const (
 	sizeofIovec  = 0x8
 	sizeofMsghdr = 0x1c
 
-	sizeofCmsghdr = 0xc
-
 	sizeofSockaddrInet  = 0x10
 	sizeofSockaddrInet6 = 0x1c
 )
diff --git a/vendor/golang.org/x/net/internal/socket/zsys_linux_mips64.go b/vendor/golang.org/x/net/internal/socket/zsys_linux_mips64.go
index 7f6e8a7fa4de2a5281b167bace367ce1863ce522..15e2aecaabaec58d7e19f5ca44498cdc9173e0de 100644
--- a/vendor/golang.org/x/net/internal/socket/zsys_linux_mips64.go
+++ b/vendor/golang.org/x/net/internal/socket/zsys_linux_mips64.go
@@ -51,8 +51,6 @@ const (
 	sizeofIovec  = 0x10
 	sizeofMsghdr = 0x38
 
-	sizeofCmsghdr = 0x10
-
 	sizeofSockaddrInet  = 0x10
 	sizeofSockaddrInet6 = 0x1c
 )
diff --git a/vendor/golang.org/x/net/internal/socket/zsys_linux_mips64le.go b/vendor/golang.org/x/net/internal/socket/zsys_linux_mips64le.go
index 7f6e8a7fa4de2a5281b167bace367ce1863ce522..15e2aecaabaec58d7e19f5ca44498cdc9173e0de 100644
--- a/vendor/golang.org/x/net/internal/socket/zsys_linux_mips64le.go
+++ b/vendor/golang.org/x/net/internal/socket/zsys_linux_mips64le.go
@@ -51,8 +51,6 @@ const (
 	sizeofIovec  = 0x10
 	sizeofMsghdr = 0x38
 
-	sizeofCmsghdr = 0x10
-
 	sizeofSockaddrInet  = 0x10
 	sizeofSockaddrInet6 = 0x1c
 )
diff --git a/vendor/golang.org/x/net/internal/socket/zsys_linux_mipsle.go b/vendor/golang.org/x/net/internal/socket/zsys_linux_mipsle.go
index 1bb10a4289fff8917c07320c9f79e0927709476c..0c847bee7a46fabe3bc52b495aa682a93602a176 100644
--- a/vendor/golang.org/x/net/internal/socket/zsys_linux_mipsle.go
+++ b/vendor/golang.org/x/net/internal/socket/zsys_linux_mipsle.go
@@ -48,8 +48,6 @@ const (
 	sizeofIovec  = 0x8
 	sizeofMsghdr = 0x1c
 
-	sizeofCmsghdr = 0xc
-
 	sizeofSockaddrInet  = 0x10
 	sizeofSockaddrInet6 = 0x1c
 )
diff --git a/vendor/golang.org/x/net/internal/socket/zsys_linux_ppc64.go b/vendor/golang.org/x/net/internal/socket/zsys_linux_ppc64.go
index 7f6e8a7fa4de2a5281b167bace367ce1863ce522..15e2aecaabaec58d7e19f5ca44498cdc9173e0de 100644
--- a/vendor/golang.org/x/net/internal/socket/zsys_linux_ppc64.go
+++ b/vendor/golang.org/x/net/internal/socket/zsys_linux_ppc64.go
@@ -51,8 +51,6 @@ const (
 	sizeofIovec  = 0x10
 	sizeofMsghdr = 0x38
 
-	sizeofCmsghdr = 0x10
-
 	sizeofSockaddrInet  = 0x10
 	sizeofSockaddrInet6 = 0x1c
 )
diff --git a/vendor/golang.org/x/net/internal/socket/zsys_linux_ppc64le.go b/vendor/golang.org/x/net/internal/socket/zsys_linux_ppc64le.go
index 7f6e8a7fa4de2a5281b167bace367ce1863ce522..15e2aecaabaec58d7e19f5ca44498cdc9173e0de 100644
--- a/vendor/golang.org/x/net/internal/socket/zsys_linux_ppc64le.go
+++ b/vendor/golang.org/x/net/internal/socket/zsys_linux_ppc64le.go
@@ -51,8 +51,6 @@ const (
 	sizeofIovec  = 0x10
 	sizeofMsghdr = 0x38
 
-	sizeofCmsghdr = 0x10
-
 	sizeofSockaddrInet  = 0x10
 	sizeofSockaddrInet6 = 0x1c
 )
diff --git a/vendor/golang.org/x/net/internal/socket/zsys_linux_riscv64.go b/vendor/golang.org/x/net/internal/socket/zsys_linux_riscv64.go
index f12a1d768244751b6d18405d29e1deeec838f2f7..12ec2e42b880847f5303e9ced0296329b52cfd0c 100644
--- a/vendor/golang.org/x/net/internal/socket/zsys_linux_riscv64.go
+++ b/vendor/golang.org/x/net/internal/socket/zsys_linux_riscv64.go
@@ -1,6 +1,7 @@
 // Code generated by cmd/cgo -godefs; DO NOT EDIT.
 // cgo -godefs defs_linux.go
 
+//go:build riscv64
 // +build riscv64
 
 package socket
@@ -52,8 +53,6 @@ const (
 	sizeofIovec  = 0x10
 	sizeofMsghdr = 0x38
 
-	sizeofCmsghdr = 0x10
-
 	sizeofSockaddrInet  = 0x10
 	sizeofSockaddrInet6 = 0x1c
 )
diff --git a/vendor/golang.org/x/net/internal/socket/zsys_linux_s390x.go b/vendor/golang.org/x/net/internal/socket/zsys_linux_s390x.go
index 7f6e8a7fa4de2a5281b167bace367ce1863ce522..15e2aecaabaec58d7e19f5ca44498cdc9173e0de 100644
--- a/vendor/golang.org/x/net/internal/socket/zsys_linux_s390x.go
+++ b/vendor/golang.org/x/net/internal/socket/zsys_linux_s390x.go
@@ -51,8 +51,6 @@ const (
 	sizeofIovec  = 0x10
 	sizeofMsghdr = 0x38
 
-	sizeofCmsghdr = 0x10
-
 	sizeofSockaddrInet  = 0x10
 	sizeofSockaddrInet6 = 0x1c
 )
diff --git a/vendor/golang.org/x/net/internal/socket/zsys_netbsd_386.go b/vendor/golang.org/x/net/internal/socket/zsys_netbsd_386.go
index 7e258cec29d3797d630e3ae922b7e966e8f0b500..6b72d24dd93ff29549573729bf97e6a24eef8557 100644
--- a/vendor/golang.org/x/net/internal/socket/zsys_netbsd_386.go
+++ b/vendor/golang.org/x/net/internal/socket/zsys_netbsd_386.go
@@ -50,8 +50,6 @@ const (
 	sizeofIovec  = 0x8
 	sizeofMsghdr = 0x1c
 
-	sizeofCmsghdr = 0xc
-
 	sizeofSockaddrInet  = 0x10
 	sizeofSockaddrInet6 = 0x1c
 )
diff --git a/vendor/golang.org/x/net/internal/socket/zsys_netbsd_amd64.go b/vendor/golang.org/x/net/internal/socket/zsys_netbsd_amd64.go
index b3f9c0d7e5ab9171fb6b1ae035a70b4f03ef0910..9aaa4ab1caf72747a1d834ac2bf50a522a78470b 100644
--- a/vendor/golang.org/x/net/internal/socket/zsys_netbsd_amd64.go
+++ b/vendor/golang.org/x/net/internal/socket/zsys_netbsd_amd64.go
@@ -53,8 +53,6 @@ const (
 	sizeofIovec  = 0x10
 	sizeofMsghdr = 0x30
 
-	sizeofCmsghdr = 0xc
-
 	sizeofSockaddrInet  = 0x10
 	sizeofSockaddrInet6 = 0x1c
 )
diff --git a/vendor/golang.org/x/net/internal/socket/zsys_netbsd_arm.go b/vendor/golang.org/x/net/internal/socket/zsys_netbsd_arm.go
index 7e258cec29d3797d630e3ae922b7e966e8f0b500..6b72d24dd93ff29549573729bf97e6a24eef8557 100644
--- a/vendor/golang.org/x/net/internal/socket/zsys_netbsd_arm.go
+++ b/vendor/golang.org/x/net/internal/socket/zsys_netbsd_arm.go
@@ -50,8 +50,6 @@ const (
 	sizeofIovec  = 0x8
 	sizeofMsghdr = 0x1c
 
-	sizeofCmsghdr = 0xc
-
 	sizeofSockaddrInet  = 0x10
 	sizeofSockaddrInet6 = 0x1c
 )
diff --git a/vendor/golang.org/x/net/internal/socket/zsys_netbsd_arm64.go b/vendor/golang.org/x/net/internal/socket/zsys_netbsd_arm64.go
index da26ef019cdee11555160bceb1da6a5d75703c9f..9aaa4ab1caf72747a1d834ac2bf50a522a78470b 100644
--- a/vendor/golang.org/x/net/internal/socket/zsys_netbsd_arm64.go
+++ b/vendor/golang.org/x/net/internal/socket/zsys_netbsd_arm64.go
@@ -50,9 +50,8 @@ type sockaddrInet6 struct {
 }
 
 const (
-	sizeofIovec   = 0x10
-	sizeofMsghdr  = 0x30
-	sizeofCmsghdr = 0xc
+	sizeofIovec  = 0x10
+	sizeofMsghdr = 0x30
 
 	sizeofSockaddrInet  = 0x10
 	sizeofSockaddrInet6 = 0x1c
diff --git a/vendor/golang.org/x/net/internal/socket/zsys_openbsd_386.go b/vendor/golang.org/x/net/internal/socket/zsys_openbsd_386.go
index 73655a14c4cf50e1ff5325abb242e01ad56fd0cd..3ec8d42fee8e58793ab1967da563b3539590cc9b 100644
--- a/vendor/golang.org/x/net/internal/socket/zsys_openbsd_386.go
+++ b/vendor/golang.org/x/net/internal/socket/zsys_openbsd_386.go
@@ -42,9 +42,8 @@ type sockaddrInet6 struct {
 }
 
 const (
-	sizeofIovec   = 0x8
-	sizeofMsghdr  = 0x1c
-	sizeofCmsghdr = 0xc
+	sizeofIovec  = 0x8
+	sizeofMsghdr = 0x1c
 
 	sizeofSockaddrInet  = 0x10
 	sizeofSockaddrInet6 = 0x1c
diff --git a/vendor/golang.org/x/net/internal/socket/zsys_openbsd_amd64.go b/vendor/golang.org/x/net/internal/socket/zsys_openbsd_amd64.go
index 0a4de80f2357226b3e2465b113c133c98a9d8915..ea0ee008d7d4b28733981e1c9c68e64e69a8d7e0 100644
--- a/vendor/golang.org/x/net/internal/socket/zsys_openbsd_amd64.go
+++ b/vendor/golang.org/x/net/internal/socket/zsys_openbsd_amd64.go
@@ -44,9 +44,8 @@ type sockaddrInet6 struct {
 }
 
 const (
-	sizeofIovec   = 0x10
-	sizeofMsghdr  = 0x30
-	sizeofCmsghdr = 0xc
+	sizeofIovec  = 0x10
+	sizeofMsghdr = 0x30
 
 	sizeofSockaddrInet  = 0x10
 	sizeofSockaddrInet6 = 0x1c
diff --git a/vendor/golang.org/x/net/internal/socket/zsys_openbsd_arm.go b/vendor/golang.org/x/net/internal/socket/zsys_openbsd_arm.go
index 73655a14c4cf50e1ff5325abb242e01ad56fd0cd..3ec8d42fee8e58793ab1967da563b3539590cc9b 100644
--- a/vendor/golang.org/x/net/internal/socket/zsys_openbsd_arm.go
+++ b/vendor/golang.org/x/net/internal/socket/zsys_openbsd_arm.go
@@ -42,9 +42,8 @@ type sockaddrInet6 struct {
 }
 
 const (
-	sizeofIovec   = 0x8
-	sizeofMsghdr  = 0x1c
-	sizeofCmsghdr = 0xc
+	sizeofIovec  = 0x8
+	sizeofMsghdr = 0x1c
 
 	sizeofSockaddrInet  = 0x10
 	sizeofSockaddrInet6 = 0x1c
diff --git a/vendor/golang.org/x/net/internal/socket/zsys_openbsd_arm64.go b/vendor/golang.org/x/net/internal/socket/zsys_openbsd_arm64.go
index 0a4de80f2357226b3e2465b113c133c98a9d8915..ea0ee008d7d4b28733981e1c9c68e64e69a8d7e0 100644
--- a/vendor/golang.org/x/net/internal/socket/zsys_openbsd_arm64.go
+++ b/vendor/golang.org/x/net/internal/socket/zsys_openbsd_arm64.go
@@ -44,9 +44,8 @@ type sockaddrInet6 struct {
 }
 
 const (
-	sizeofIovec   = 0x10
-	sizeofMsghdr  = 0x30
-	sizeofCmsghdr = 0xc
+	sizeofIovec  = 0x10
+	sizeofMsghdr = 0x30
 
 	sizeofSockaddrInet  = 0x10
 	sizeofSockaddrInet6 = 0x1c
diff --git a/vendor/golang.org/x/net/internal/socket/zsys_openbsd_mips64.go b/vendor/golang.org/x/net/internal/socket/zsys_openbsd_mips64.go
new file mode 100644
index 0000000000000000000000000000000000000000..0112832400bdd03b055e384f7d18fd1967e9c2be
--- /dev/null
+++ b/vendor/golang.org/x/net/internal/socket/zsys_openbsd_mips64.go
@@ -0,0 +1,50 @@
+// Code generated by cmd/cgo -godefs; DO NOT EDIT.
+// cgo -godefs defs_openbsd.go
+
+package socket
+
+type iovec struct {
+	Base *byte
+	Len  uint64
+}
+
+type msghdr struct {
+	Name       *byte
+	Namelen    uint32
+	Iov        *iovec
+	Iovlen     uint32
+	Control    *byte
+	Controllen uint32
+	Flags      int32
+}
+
+type cmsghdr struct {
+	Len   uint32
+	Level int32
+	Type  int32
+}
+
+type sockaddrInet struct {
+	Len    uint8
+	Family uint8
+	Port   uint16
+	Addr   [4]byte /* in_addr */
+	Zero   [8]int8
+}
+
+type sockaddrInet6 struct {
+	Len      uint8
+	Family   uint8
+	Port     uint16
+	Flowinfo uint32
+	Addr     [16]byte /* in6_addr */
+	Scope_id uint32
+}
+
+const (
+	sizeofIovec  = 0x10
+	sizeofMsghdr = 0x30
+
+	sizeofSockaddrInet  = 0x10
+	sizeofSockaddrInet6 = 0x1c
+)
diff --git a/vendor/golang.org/x/net/internal/socket/zsys_solaris_amd64.go b/vendor/golang.org/x/net/internal/socket/zsys_solaris_amd64.go
index 353cd5fb4ec3f1e1f0cb71c7764ef33266caf59c..48b2b591f67dea10b872e1f049ae1433a27305e4 100644
--- a/vendor/golang.org/x/net/internal/socket/zsys_solaris_amd64.go
+++ b/vendor/golang.org/x/net/internal/socket/zsys_solaris_amd64.go
@@ -43,9 +43,8 @@ type sockaddrInet6 struct {
 }
 
 const (
-	sizeofIovec   = 0x10
-	sizeofMsghdr  = 0x30
-	sizeofCmsghdr = 0xc
+	sizeofIovec  = 0x10
+	sizeofMsghdr = 0x30
 
 	sizeofSockaddrInet  = 0x10
 	sizeofSockaddrInet6 = 0x20
diff --git a/vendor/golang.org/x/net/internal/socket/zsys_zos_s390x.go b/vendor/golang.org/x/net/internal/socket/zsys_zos_s390x.go
new file mode 100644
index 0000000000000000000000000000000000000000..514ca3754d4c6388e090be46aeb3879c4ae7340c
--- /dev/null
+++ b/vendor/golang.org/x/net/internal/socket/zsys_zos_s390x.go
@@ -0,0 +1,32 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package socket
+
+type iovec struct {
+	Base *byte
+	Len  uint64
+}
+
+type msghdr struct {
+	Name       *byte
+	Iov        *iovec
+	Control    *byte
+	Flags      int32
+	Namelen    uint32
+	Iovlen     int32
+	Controllen uint32
+}
+
+type cmsghdr struct {
+	Len   int32
+	Level int32
+	Type  int32
+}
+
+const (
+	sizeofCmsghdr       = 12
+	sizeofSockaddrInet  = 16
+	sizeofSockaddrInet6 = 28
+)
diff --git a/vendor/golang.org/x/net/ipv4/control_bsd.go b/vendor/golang.org/x/net/ipv4/control_bsd.go
index 69c4f553cda4deab6fe4f59ad7f09761a556f24d..6fef740f2ff68764cde3eb8d5aa00e63a43be91c 100644
--- a/vendor/golang.org/x/net/ipv4/control_bsd.go
+++ b/vendor/golang.org/x/net/ipv4/control_bsd.go
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build aix || darwin || dragonfly || freebsd || netbsd || openbsd
 // +build aix darwin dragonfly freebsd netbsd openbsd
 
 package ipv4
diff --git a/vendor/golang.org/x/net/ipv4/control_pktinfo.go b/vendor/golang.org/x/net/ipv4/control_pktinfo.go
index 425338f35bf1b71442e22c6530980f84dfc84323..b0a8dbe4e25e5df751178c75f57c38350f0fa916 100644
--- a/vendor/golang.org/x/net/ipv4/control_pktinfo.go
+++ b/vendor/golang.org/x/net/ipv4/control_pktinfo.go
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build darwin || linux || solaris
 // +build darwin linux solaris
 
 package ipv4
diff --git a/vendor/golang.org/x/net/ipv4/control_stub.go b/vendor/golang.org/x/net/ipv4/control_stub.go
index a0c049d683ade1dca716a1aea677df24bfc9e1e0..f27322c3ed47b704e0ea4d084814d458ca4fa8fe 100644
--- a/vendor/golang.org/x/net/ipv4/control_stub.go
+++ b/vendor/golang.org/x/net/ipv4/control_stub.go
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build !aix,!darwin,!dragonfly,!freebsd,!linux,!netbsd,!openbsd,!solaris,!windows
+//go:build !aix && !darwin && !dragonfly && !freebsd && !linux && !netbsd && !openbsd && !solaris && !windows && !zos
+// +build !aix,!darwin,!dragonfly,!freebsd,!linux,!netbsd,!openbsd,!solaris,!windows,!zos
 
 package ipv4
 
diff --git a/vendor/golang.org/x/net/ipv4/control_unix.go b/vendor/golang.org/x/net/ipv4/control_unix.go
index b27fa4903a996ea033a9fb9e35a8c4d14333c565..edce30f12611f6177697da57c7f88e056ebdaccd 100644
--- a/vendor/golang.org/x/net/ipv4/control_unix.go
+++ b/vendor/golang.org/x/net/ipv4/control_unix.go
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris
 // +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
 
 package ipv4
diff --git a/vendor/golang.org/x/net/ipv4/control_zos.go b/vendor/golang.org/x/net/ipv4/control_zos.go
new file mode 100644
index 0000000000000000000000000000000000000000..04420003e0261192dd8385b426d031ad3e5c6db4
--- /dev/null
+++ b/vendor/golang.org/x/net/ipv4/control_zos.go
@@ -0,0 +1,86 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package ipv4
+
+import (
+	"net"
+	"unsafe"
+
+	"golang.org/x/net/internal/iana"
+	"golang.org/x/net/internal/socket"
+)
+
+func marshalPacketInfo(b []byte, cm *ControlMessage) []byte {
+	m := socket.ControlMessage(b)
+	m.MarshalHeader(iana.ProtocolIP, sysIP_PKTINFO, sizeofInetPktinfo)
+	if cm != nil {
+		pi := (*inetPktinfo)(unsafe.Pointer(&m.Data(sizeofInetPktinfo)[0]))
+		if ip := cm.Src.To4(); ip != nil {
+			copy(pi.Addr[:], ip)
+		}
+		if cm.IfIndex > 0 {
+			pi.setIfindex(cm.IfIndex)
+		}
+	}
+	return m.Next(sizeofInetPktinfo)
+}
+
+func parsePacketInfo(cm *ControlMessage, b []byte) {
+	pi := (*inetPktinfo)(unsafe.Pointer(&b[0]))
+	cm.IfIndex = int(pi.Ifindex)
+	if len(cm.Dst) < net.IPv4len {
+		cm.Dst = make(net.IP, net.IPv4len)
+	}
+	copy(cm.Dst, pi.Addr[:])
+}
+
+func setControlMessage(c *socket.Conn, opt *rawOpt, cf ControlFlags, on bool) error {
+	opt.Lock()
+	defer opt.Unlock()
+	if so, ok := sockOpts[ssoReceiveTTL]; ok && cf&FlagTTL != 0 {
+		if err := so.SetInt(c, boolint(on)); err != nil {
+			return err
+		}
+		if on {
+			opt.set(FlagTTL)
+		} else {
+			opt.clear(FlagTTL)
+		}
+	}
+	if so, ok := sockOpts[ssoPacketInfo]; ok {
+		if cf&(FlagSrc|FlagDst|FlagInterface) != 0 {
+			if err := so.SetInt(c, boolint(on)); err != nil {
+				return err
+			}
+			if on {
+				opt.set(cf & (FlagSrc | FlagDst | FlagInterface))
+			} else {
+				opt.clear(cf & (FlagSrc | FlagDst | FlagInterface))
+			}
+		}
+	} else {
+		if so, ok := sockOpts[ssoReceiveDst]; ok && cf&FlagDst != 0 {
+			if err := so.SetInt(c, boolint(on)); err != nil {
+				return err
+			}
+			if on {
+				opt.set(FlagDst)
+			} else {
+				opt.clear(FlagDst)
+			}
+		}
+		if so, ok := sockOpts[ssoReceiveInterface]; ok && cf&FlagInterface != 0 {
+			if err := so.SetInt(c, boolint(on)); err != nil {
+				return err
+			}
+			if on {
+				opt.set(FlagInterface)
+			} else {
+				opt.clear(FlagInterface)
+			}
+		}
+	}
+	return nil
+}
diff --git a/vendor/golang.org/x/net/ipv4/header.go b/vendor/golang.org/x/net/ipv4/header.go
index c271ca46cb98f360f57d7e1c858dc12afc197cef..a00a3eaff9150b4ea0275d04aa4e7a781e4a3714 100644
--- a/vendor/golang.org/x/net/ipv4/header.go
+++ b/vendor/golang.org/x/net/ipv4/header.go
@@ -67,7 +67,7 @@ func (h *Header) Marshal() ([]byte, error) {
 	b[1] = byte(h.TOS)
 	flagsAndFragOff := (h.FragOff & 0x1fff) | int(h.Flags<<13)
 	switch runtime.GOOS {
-	case "darwin", "dragonfly", "netbsd":
+	case "darwin", "ios", "dragonfly", "netbsd":
 		socket.NativeEndian.PutUint16(b[2:4], uint16(h.TotalLen))
 		socket.NativeEndian.PutUint16(b[6:8], uint16(flagsAndFragOff))
 	case "freebsd":
@@ -126,7 +126,7 @@ func (h *Header) Parse(b []byte) error {
 	h.Src = net.IPv4(b[12], b[13], b[14], b[15])
 	h.Dst = net.IPv4(b[16], b[17], b[18], b[19])
 	switch runtime.GOOS {
-	case "darwin", "dragonfly", "netbsd":
+	case "darwin", "ios", "dragonfly", "netbsd":
 		h.TotalLen = int(socket.NativeEndian.Uint16(b[2:4])) + hdrlen
 		h.FragOff = int(socket.NativeEndian.Uint16(b[6:8]))
 	case "freebsd":
diff --git a/vendor/golang.org/x/net/ipv4/icmp_stub.go b/vendor/golang.org/x/net/ipv4/icmp_stub.go
index 21bb29ab3669a77b92cc80c666dd47d457833980..cd4ee6e1c920876d2774dd8c37a7da04cb8319a6 100644
--- a/vendor/golang.org/x/net/ipv4/icmp_stub.go
+++ b/vendor/golang.org/x/net/ipv4/icmp_stub.go
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build !linux
 // +build !linux
 
 package ipv4
diff --git a/vendor/golang.org/x/net/ipv4/payload_cmsg.go b/vendor/golang.org/x/net/ipv4/payload_cmsg.go
index e7614661d7b75af68bc7d0e5f56c1a7fbaa9ec25..1bb370e25fd7d1aac3783f07a27919fe134a627b 100644
--- a/vendor/golang.org/x/net/ipv4/payload_cmsg.go
+++ b/vendor/golang.org/x/net/ipv4/payload_cmsg.go
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
+//go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris || zos
+// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris zos
 
 package ipv4
 
diff --git a/vendor/golang.org/x/net/ipv4/payload_nocmsg.go b/vendor/golang.org/x/net/ipv4/payload_nocmsg.go
index 1116256f245763bcc75f9d17c529fb11eb3d8ae2..53f0794eb764380688e98d14558d74ec827c8d1f 100644
--- a/vendor/golang.org/x/net/ipv4/payload_nocmsg.go
+++ b/vendor/golang.org/x/net/ipv4/payload_nocmsg.go
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build !aix,!darwin,!dragonfly,!freebsd,!linux,!netbsd,!openbsd,!solaris
+//go:build !aix && !darwin && !dragonfly && !freebsd && !linux && !netbsd && !openbsd && !solaris && !zos
+// +build !aix,!darwin,!dragonfly,!freebsd,!linux,!netbsd,!openbsd,!solaris,!zos
 
 package ipv4
 
diff --git a/vendor/golang.org/x/net/ipv4/sockopt_posix.go b/vendor/golang.org/x/net/ipv4/sockopt_posix.go
index dea64519d8e267e9ff6df40de098114e6fd40ede..eb07c1c02a5cc02d924acba3b0f350edd115072c 100644
--- a/vendor/golang.org/x/net/ipv4/sockopt_posix.go
+++ b/vendor/golang.org/x/net/ipv4/sockopt_posix.go
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris windows
+//go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris || windows || zos
+// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris windows zos
 
 package ipv4
 
diff --git a/vendor/golang.org/x/net/ipv4/sockopt_stub.go b/vendor/golang.org/x/net/ipv4/sockopt_stub.go
index 37d4806b34297c0640936fa053e28af72d7ac91d..cf036893b7d1cfb96112a2d2782ab48fbb922f2e 100644
--- a/vendor/golang.org/x/net/ipv4/sockopt_stub.go
+++ b/vendor/golang.org/x/net/ipv4/sockopt_stub.go
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build !aix,!darwin,!dragonfly,!freebsd,!linux,!netbsd,!openbsd,!solaris,!windows
+//go:build !aix && !darwin && !dragonfly && !freebsd && !linux && !netbsd && !openbsd && !solaris && !windows && !zos
+// +build !aix,!darwin,!dragonfly,!freebsd,!linux,!netbsd,!openbsd,!solaris,!windows,!zos
 
 package ipv4
 
diff --git a/vendor/golang.org/x/net/ipv4/sys_aix.go b/vendor/golang.org/x/net/ipv4/sys_aix.go
index 3d1201e6d7c768b6c0e044b11f27e2b92e58f2d9..b0b69d9c02cecf6d94940873c3f790b856cc29da 100644
--- a/vendor/golang.org/x/net/ipv4/sys_aix.go
+++ b/vendor/golang.org/x/net/ipv4/sys_aix.go
@@ -3,6 +3,7 @@
 // license that can be found in the LICENSE file.
 
 // Added for go1.11 compatibility
+//go:build aix
 // +build aix
 
 package ipv4
diff --git a/vendor/golang.org/x/net/ipv4/sys_asmreq.go b/vendor/golang.org/x/net/ipv4/sys_asmreq.go
index 76d670acaa9ec6a8cf80b5d5bebf2b662072abd9..22322b387ec9d49b0e8b9719d2502da4fe30c229 100644
--- a/vendor/golang.org/x/net/ipv4/sys_asmreq.go
+++ b/vendor/golang.org/x/net/ipv4/sys_asmreq.go
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build aix || darwin || dragonfly || freebsd || netbsd || openbsd || solaris || windows
 // +build aix darwin dragonfly freebsd netbsd openbsd solaris windows
 
 package ipv4
diff --git a/vendor/golang.org/x/net/ipv4/sys_asmreq_stub.go b/vendor/golang.org/x/net/ipv4/sys_asmreq_stub.go
index 6dc339ce67a38d39915460103a307b7fc6096eac..fde640142df593431734df7e60bd088400eaaa56 100644
--- a/vendor/golang.org/x/net/ipv4/sys_asmreq_stub.go
+++ b/vendor/golang.org/x/net/ipv4/sys_asmreq_stub.go
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build !aix && !darwin && !dragonfly && !freebsd && !netbsd && !openbsd && !solaris && !windows
 // +build !aix,!darwin,!dragonfly,!freebsd,!netbsd,!openbsd,!solaris,!windows
 
 package ipv4
diff --git a/vendor/golang.org/x/net/ipv4/sys_asmreqn.go b/vendor/golang.org/x/net/ipv4/sys_asmreqn.go
index 1f24f69f3b081df46098cf02a9d9d34fbed42eb6..fbfe4af69d2dfd0ec31440e18d86e6245ca31f35 100644
--- a/vendor/golang.org/x/net/ipv4/sys_asmreqn.go
+++ b/vendor/golang.org/x/net/ipv4/sys_asmreqn.go
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build darwin || freebsd || linux
 // +build darwin freebsd linux
 
 package ipv4
diff --git a/vendor/golang.org/x/net/ipv4/sys_asmreqn_stub.go b/vendor/golang.org/x/net/ipv4/sys_asmreqn_stub.go
index 48ef55624ec40678c2d555edd466b4079d6b0ee5..dcb15f25a55c82a24da74e79169d428a0809248b 100644
--- a/vendor/golang.org/x/net/ipv4/sys_asmreqn_stub.go
+++ b/vendor/golang.org/x/net/ipv4/sys_asmreqn_stub.go
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build !darwin && !freebsd && !linux
 // +build !darwin,!freebsd,!linux
 
 package ipv4
diff --git a/vendor/golang.org/x/net/ipv4/sys_bpf.go b/vendor/golang.org/x/net/ipv4/sys_bpf.go
index 5c03dce3b77490539adc31d7cbfe2511907eb757..fb11e324e2ca71e00040c58e97d6fbf65a721437 100644
--- a/vendor/golang.org/x/net/ipv4/sys_bpf.go
+++ b/vendor/golang.org/x/net/ipv4/sys_bpf.go
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build linux
 // +build linux
 
 package ipv4
diff --git a/vendor/golang.org/x/net/ipv4/sys_bpf_stub.go b/vendor/golang.org/x/net/ipv4/sys_bpf_stub.go
index 5c98642716b5663d9baa59ed1880cf4dad111b96..fc53a0d33ae97732b977a35b43518985e34fe52b 100644
--- a/vendor/golang.org/x/net/ipv4/sys_bpf_stub.go
+++ b/vendor/golang.org/x/net/ipv4/sys_bpf_stub.go
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build !linux
 // +build !linux
 
 package ipv4
diff --git a/vendor/golang.org/x/net/ipv4/sys_bsd.go b/vendor/golang.org/x/net/ipv4/sys_bsd.go
index 58256dd9d6fa98ec17953c5bb43e5aef45d6c2aa..8074f9898c30e658ac11a848ee847894a142e6b0 100644
--- a/vendor/golang.org/x/net/ipv4/sys_bsd.go
+++ b/vendor/golang.org/x/net/ipv4/sys_bsd.go
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build netbsd || openbsd
 // +build netbsd openbsd
 
 package ipv4
diff --git a/vendor/golang.org/x/net/ipv4/sys_ssmreq.go b/vendor/golang.org/x/net/ipv4/sys_ssmreq.go
index eeced7f3138bf91f5b8500c9dcf336539015bc2e..6a4e7abf9bdff13d6225e6497ff8176898f7d508 100644
--- a/vendor/golang.org/x/net/ipv4/sys_ssmreq.go
+++ b/vendor/golang.org/x/net/ipv4/sys_ssmreq.go
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build darwin || freebsd || linux || solaris
 // +build darwin freebsd linux solaris
 
 package ipv4
diff --git a/vendor/golang.org/x/net/ipv4/sys_ssmreq_stub.go b/vendor/golang.org/x/net/ipv4/sys_ssmreq_stub.go
index c0921674b0506d290aea3b0e7a3878a1a4e8d1da..157159fd507bdf06811e41f409260cce854498b5 100644
--- a/vendor/golang.org/x/net/ipv4/sys_ssmreq_stub.go
+++ b/vendor/golang.org/x/net/ipv4/sys_ssmreq_stub.go
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build !darwin && !freebsd && !linux && !solaris
 // +build !darwin,!freebsd,!linux,!solaris
 
 package ipv4
diff --git a/vendor/golang.org/x/net/ipv4/sys_stub.go b/vendor/golang.org/x/net/ipv4/sys_stub.go
index b9c85b334fcc4fcd0f51d3fa54757b4b2e66b134..d5508516585231a85b65ca0843e81aee07e09e3a 100644
--- a/vendor/golang.org/x/net/ipv4/sys_stub.go
+++ b/vendor/golang.org/x/net/ipv4/sys_stub.go
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build !aix,!darwin,!dragonfly,!freebsd,!linux,!netbsd,!openbsd,!solaris,!windows
+//go:build !aix && !darwin && !dragonfly && !freebsd && !linux && !netbsd && !openbsd && !solaris && !windows && !zos
+// +build !aix,!darwin,!dragonfly,!freebsd,!linux,!netbsd,!openbsd,!solaris,!windows,!zos
 
 package ipv4
 
diff --git a/vendor/golang.org/x/net/ipv4/sys_zos.go b/vendor/golang.org/x/net/ipv4/sys_zos.go
new file mode 100644
index 0000000000000000000000000000000000000000..7426606cff3c2ef666af4006104db1335a9e8e06
--- /dev/null
+++ b/vendor/golang.org/x/net/ipv4/sys_zos.go
@@ -0,0 +1,55 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package ipv4
+
+import (
+	"net"
+	"syscall"
+	"unsafe"
+
+	"golang.org/x/net/internal/iana"
+	"golang.org/x/net/internal/socket"
+)
+
+var (
+	ctlOpts = [ctlMax]ctlOpt{
+		ctlPacketInfo: {sysIP_PKTINFO, sizeofInetPktinfo, marshalPacketInfo, parsePacketInfo},
+	}
+
+	sockOpts = map[int]*sockOpt{
+		ssoMulticastTTL:       {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_MULTICAST_TTL, Len: 1}},
+		ssoMulticastInterface: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_MULTICAST_IF, Len: 4}},
+		ssoMulticastLoopback:  {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_MULTICAST_LOOP, Len: 1}},
+		ssoPacketInfo:         {Option: socket.Option{Level: iana.ProtocolIP, Name: sysIP_RECVPKTINFO, Len: 4}},
+		ssoJoinGroup:          {Option: socket.Option{Level: iana.ProtocolIP, Name: sysMCAST_JOIN_GROUP, Len: sizeofGroupReq}, typ: ssoTypeGroupReq},
+		ssoLeaveGroup:         {Option: socket.Option{Level: iana.ProtocolIP, Name: sysMCAST_LEAVE_GROUP, Len: sizeofGroupReq}, typ: ssoTypeGroupReq},
+		ssoJoinSourceGroup:    {Option: socket.Option{Level: iana.ProtocolIP, Name: sysMCAST_JOIN_SOURCE_GROUP, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq},
+		ssoLeaveSourceGroup:   {Option: socket.Option{Level: iana.ProtocolIP, Name: sysMCAST_LEAVE_SOURCE_GROUP, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq},
+		ssoBlockSourceGroup:   {Option: socket.Option{Level: iana.ProtocolIP, Name: sysMCAST_BLOCK_SOURCE, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq},
+		ssoUnblockSourceGroup: {Option: socket.Option{Level: iana.ProtocolIP, Name: sysMCAST_UNBLOCK_SOURCE, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq},
+	}
+)
+
+func (pi *inetPktinfo) setIfindex(i int) {
+	pi.Ifindex = uint32(i)
+}
+
+func (gr *groupReq) setGroup(grp net.IP) {
+	sa := (*sockaddrInet4)(unsafe.Pointer(&gr.Group))
+	sa.Family = syscall.AF_INET
+	sa.Len = sizeofSockaddrInet4
+	copy(sa.Addr[:], grp)
+}
+
+func (gsr *groupSourceReq) setSourceGroup(grp, src net.IP) {
+	sa := (*sockaddrInet4)(unsafe.Pointer(&gsr.Group))
+	sa.Family = syscall.AF_INET
+	sa.Len = sizeofSockaddrInet4
+	copy(sa.Addr[:], grp)
+	sa = (*sockaddrInet4)(unsafe.Pointer(&gsr.Source))
+	sa.Family = syscall.AF_INET
+	sa.Len = sizeofSockaddrInet4
+	copy(sa.Addr[:], src)
+}
diff --git a/vendor/golang.org/x/net/ipv4/zsys_aix_ppc64.go b/vendor/golang.org/x/net/ipv4/zsys_aix_ppc64.go
index c741d5c8ea91f65a57d1036d9da5c9cb4722a00c..d6f24754e5a4d873b7e6a322710db691140c801a 100644
--- a/vendor/golang.org/x/net/ipv4/zsys_aix_ppc64.go
+++ b/vendor/golang.org/x/net/ipv4/zsys_aix_ppc64.go
@@ -2,6 +2,7 @@
 // cgo -godefs defs_aix.go
 
 // Added for go1.11 compatibility
+//go:build aix
 // +build aix
 
 package ipv4
diff --git a/vendor/golang.org/x/net/ipv4/zsys_linux_riscv64.go b/vendor/golang.org/x/net/ipv4/zsys_linux_riscv64.go
index e626134a8b50fda12bbecd28720607878edda153..ec9e2dbecca9e4e6ca088bba2e1bac4611fe9f8c 100644
--- a/vendor/golang.org/x/net/ipv4/zsys_linux_riscv64.go
+++ b/vendor/golang.org/x/net/ipv4/zsys_linux_riscv64.go
@@ -1,6 +1,7 @@
 // Code generated by cmd/cgo -godefs; DO NOT EDIT.
 // cgo -godefs defs_linux.go
 
+//go:build riscv64
 // +build riscv64
 
 package ipv4
diff --git a/vendor/golang.org/x/net/ipv4/zsys_zos_s390x.go b/vendor/golang.org/x/net/ipv4/zsys_zos_s390x.go
new file mode 100644
index 0000000000000000000000000000000000000000..4bbfda07dc3a263e9cc943db4749bbeb24562918
--- /dev/null
+++ b/vendor/golang.org/x/net/ipv4/zsys_zos_s390x.go
@@ -0,0 +1,80 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Hand edited based on zerrors_zos_s390x.go
+// TODO(Bill O'Farrell): auto-generate.
+
+package ipv4
+
+const (
+	sysIP_ADD_MEMBERSHIP         = 5
+	sysIP_ADD_SOURCE_MEMBERSHIP  = 12
+	sysIP_BLOCK_SOURCE           = 10
+	sysIP_DEFAULT_MULTICAST_LOOP = 1
+	sysIP_DEFAULT_MULTICAST_TTL  = 1
+	sysIP_DROP_MEMBERSHIP        = 6
+	sysIP_DROP_SOURCE_MEMBERSHIP = 13
+	sysIP_MAX_MEMBERSHIPS        = 20
+	sysIP_MULTICAST_IF           = 7
+	sysIP_MULTICAST_LOOP         = 4
+	sysIP_MULTICAST_TTL          = 3
+	sysIP_OPTIONS                = 1
+	sysIP_PKTINFO                = 101
+	sysIP_RECVPKTINFO            = 102
+	sysIP_TOS                    = 2
+	sysIP_UNBLOCK_SOURCE         = 11
+
+	sysMCAST_JOIN_GROUP         = 40
+	sysMCAST_LEAVE_GROUP        = 41
+	sysMCAST_JOIN_SOURCE_GROUP  = 42
+	sysMCAST_LEAVE_SOURCE_GROUP = 43
+	sysMCAST_BLOCK_SOURCE       = 44
+	sysMCAST_UNBLOCK_SOURCE     = 45
+
+	sizeofIPMreq          = 8
+	sizeofSockaddrInet4   = 16
+	sizeofSockaddrStorage = 128
+	sizeofGroupReq        = 136
+	sizeofGroupSourceReq  = 264
+	sizeofInetPktinfo     = 8
+)
+
+type sockaddrInet4 struct {
+	Len    uint8
+	Family uint8
+	Port   uint16
+	Addr   [4]byte
+	Zero   [8]uint8
+}
+
+type inetPktinfo struct {
+	Addr    [4]byte
+	Ifindex uint32
+}
+
+type sockaddrStorage struct {
+	Len      uint8
+	Family   byte
+	ss_pad1  [6]byte
+	ss_align int64
+	ss_pad2  [112]byte
+}
+
+type groupReq struct {
+	Interface uint32
+	reserved  uint32
+	Group     sockaddrStorage
+}
+
+type groupSourceReq struct {
+	Interface uint32
+	reserved  uint32
+	Group     sockaddrStorage
+	Source    sockaddrStorage
+}
+
+type ipMreq struct {
+	Multiaddr [4]byte /* in_addr */
+	Interface [4]byte /* in_addr */
+}
diff --git a/vendor/golang.org/x/net/ipv6/control_rfc2292_unix.go b/vendor/golang.org/x/net/ipv6/control_rfc2292_unix.go
index 9fd9eb15e3bc4f2d946b6059f5cff3e162fc03ea..dd5fdc3133cab2c6b2166affa04778cd755cf375 100644
--- a/vendor/golang.org/x/net/ipv6/control_rfc2292_unix.go
+++ b/vendor/golang.org/x/net/ipv6/control_rfc2292_unix.go
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build darwin
 // +build darwin
 
 package ipv6
diff --git a/vendor/golang.org/x/net/ipv6/control_rfc3542_unix.go b/vendor/golang.org/x/net/ipv6/control_rfc3542_unix.go
index 8c221b598957f370858fc0864859c14f47e561b8..24221941950c3e087789f9e5b12d11d5a10f9388 100644
--- a/vendor/golang.org/x/net/ipv6/control_rfc3542_unix.go
+++ b/vendor/golang.org/x/net/ipv6/control_rfc3542_unix.go
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
+//go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris || zos
+// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris zos
 
 package ipv6
 
diff --git a/vendor/golang.org/x/net/ipv6/control_stub.go b/vendor/golang.org/x/net/ipv6/control_stub.go
index 1d773cbcc8e69d6b2372d0200eaf3cc3c3e8f893..b7e8643fc9c2830a56258165e151e81cf601fff9 100644
--- a/vendor/golang.org/x/net/ipv6/control_stub.go
+++ b/vendor/golang.org/x/net/ipv6/control_stub.go
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build !aix,!darwin,!dragonfly,!freebsd,!linux,!netbsd,!openbsd,!solaris,!windows
+//go:build !aix && !darwin && !dragonfly && !freebsd && !linux && !netbsd && !openbsd && !solaris && !windows && !zos
+// +build !aix,!darwin,!dragonfly,!freebsd,!linux,!netbsd,!openbsd,!solaris,!windows,!zos
 
 package ipv6
 
diff --git a/vendor/golang.org/x/net/ipv6/control_unix.go b/vendor/golang.org/x/net/ipv6/control_unix.go
index 0971a008bf4f97c7a3ace1442aceacaf0ebc89d2..63e475db831865a316e69211b279ec3cd62d1532 100644
--- a/vendor/golang.org/x/net/ipv6/control_unix.go
+++ b/vendor/golang.org/x/net/ipv6/control_unix.go
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
+//go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris || zos
+// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris zos
 
 package ipv6
 
diff --git a/vendor/golang.org/x/net/ipv6/icmp_bsd.go b/vendor/golang.org/x/net/ipv6/icmp_bsd.go
index b03025cdccfc56640415dc6ac92582a1b7e45ee0..120bf8775839eb812ab44785cb732812fa66c184 100644
--- a/vendor/golang.org/x/net/ipv6/icmp_bsd.go
+++ b/vendor/golang.org/x/net/ipv6/icmp_bsd.go
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build aix || darwin || dragonfly || freebsd || netbsd || openbsd
 // +build aix darwin dragonfly freebsd netbsd openbsd
 
 package ipv6
diff --git a/vendor/golang.org/x/net/ipv6/icmp_stub.go b/vendor/golang.org/x/net/ipv6/icmp_stub.go
index 370e51acd1fb35cfb2501e971a21bd4a6a3f5a4f..d60136a9016eb7338ef44a26ed37b81fb776359b 100644
--- a/vendor/golang.org/x/net/ipv6/icmp_stub.go
+++ b/vendor/golang.org/x/net/ipv6/icmp_stub.go
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build !aix,!darwin,!dragonfly,!freebsd,!linux,!netbsd,!openbsd,!solaris,!windows
+//go:build !aix && !darwin && !dragonfly && !freebsd && !linux && !netbsd && !openbsd && !solaris && !windows && !zos
+// +build !aix,!darwin,!dragonfly,!freebsd,!linux,!netbsd,!openbsd,!solaris,!windows,!zos
 
 package ipv6
 
diff --git a/vendor/golang.org/x/net/ipv6/icmp_zos.go b/vendor/golang.org/x/net/ipv6/icmp_zos.go
new file mode 100644
index 0000000000000000000000000000000000000000..ddf8f093fc412ec96ce257dcfa0974ad0c2496e9
--- /dev/null
+++ b/vendor/golang.org/x/net/ipv6/icmp_zos.go
@@ -0,0 +1,29 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package ipv6
+
+func (f *icmpv6Filter) accept(typ ICMPType) {
+	f.Filt[typ>>5] |= 1 << (uint32(typ) & 31)
+
+}
+
+func (f *icmpv6Filter) block(typ ICMPType) {
+	f.Filt[typ>>5] &^= 1 << (uint32(typ) & 31)
+
+}
+
+func (f *icmpv6Filter) setAll(block bool) {
+	for i := range f.Filt {
+		if block {
+			f.Filt[i] = 0
+		} else {
+			f.Filt[i] = 1<<32 - 1
+		}
+	}
+}
+
+func (f *icmpv6Filter) willBlock(typ ICMPType) bool {
+	return f.Filt[typ>>5]&(1<<(uint32(typ)&31)) == 0
+}
diff --git a/vendor/golang.org/x/net/ipv6/payload_cmsg.go b/vendor/golang.org/x/net/ipv6/payload_cmsg.go
index 284a04278ed02dfde5177b102f30e94743e35979..b0692e4304f5038d066c1f66b7bb0bdd02b20475 100644
--- a/vendor/golang.org/x/net/ipv6/payload_cmsg.go
+++ b/vendor/golang.org/x/net/ipv6/payload_cmsg.go
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
+//go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris || zos
+// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris zos
 
 package ipv6
 
diff --git a/vendor/golang.org/x/net/ipv6/payload_nocmsg.go b/vendor/golang.org/x/net/ipv6/payload_nocmsg.go
index c5a4c967527d79ec839a73870817786f3ad9ba77..cd0ff508388d5cd13bd98962a264129363d4a9a4 100644
--- a/vendor/golang.org/x/net/ipv6/payload_nocmsg.go
+++ b/vendor/golang.org/x/net/ipv6/payload_nocmsg.go
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build !aix,!darwin,!dragonfly,!freebsd,!linux,!netbsd,!openbsd,!solaris
+//go:build !aix && !darwin && !dragonfly && !freebsd && !linux && !netbsd && !openbsd && !solaris && !zos
+// +build !aix,!darwin,!dragonfly,!freebsd,!linux,!netbsd,!openbsd,!solaris,!zos
 
 package ipv6
 
diff --git a/vendor/golang.org/x/net/ipv6/sockopt_posix.go b/vendor/golang.org/x/net/ipv6/sockopt_posix.go
index 824c623ccefd507b9ad4cedc3f16f13037c21b15..37c6287130ffbb49a2a40220e4e13d3f7fdf9631 100644
--- a/vendor/golang.org/x/net/ipv6/sockopt_posix.go
+++ b/vendor/golang.org/x/net/ipv6/sockopt_posix.go
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris windows
+//go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris || windows || zos
+// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris windows zos
 
 package ipv6
 
diff --git a/vendor/golang.org/x/net/ipv6/sockopt_stub.go b/vendor/golang.org/x/net/ipv6/sockopt_stub.go
index 0a87a93bbd4db54ea7d82f7bda3a5f17f4057f5b..32fd8664ceb8896cfcfa6568a81d32fb8545d0dc 100644
--- a/vendor/golang.org/x/net/ipv6/sockopt_stub.go
+++ b/vendor/golang.org/x/net/ipv6/sockopt_stub.go
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build !aix,!darwin,!dragonfly,!freebsd,!linux,!netbsd,!openbsd,!solaris,!windows
+//go:build !aix && !darwin && !dragonfly && !freebsd && !linux && !netbsd && !openbsd && !solaris && !windows && !zos
+// +build !aix,!darwin,!dragonfly,!freebsd,!linux,!netbsd,!openbsd,!solaris,!windows,!zos
 
 package ipv6
 
diff --git a/vendor/golang.org/x/net/ipv6/sys_aix.go b/vendor/golang.org/x/net/ipv6/sys_aix.go
index bce7091fb0b3d4d5a5122cb0312401b61b2a549d..29c5c0e4f91552000fc6063bb7633c12bc66bc57 100644
--- a/vendor/golang.org/x/net/ipv6/sys_aix.go
+++ b/vendor/golang.org/x/net/ipv6/sys_aix.go
@@ -3,6 +3,7 @@
 // license that can be found in the LICENSE file.
 
 // Added for go1.11 compatibility
+//go:build aix
 // +build aix
 
 package ipv6
diff --git a/vendor/golang.org/x/net/ipv6/sys_asmreq.go b/vendor/golang.org/x/net/ipv6/sys_asmreq.go
index 8c3934c3eecb080de679c7e74222b5ecc3c8880a..6ff9950d13586012860ed911c38e2add1ef0db65 100644
--- a/vendor/golang.org/x/net/ipv6/sys_asmreq.go
+++ b/vendor/golang.org/x/net/ipv6/sys_asmreq.go
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris || windows
 // +build aix darwin dragonfly freebsd linux netbsd openbsd solaris windows
 
 package ipv6
diff --git a/vendor/golang.org/x/net/ipv6/sys_asmreq_stub.go b/vendor/golang.org/x/net/ipv6/sys_asmreq_stub.go
index 87ae4818144fc88c879c76b599ffc9cbd325433e..485290cb824b4f5492021001dae998cc84e7769d 100644
--- a/vendor/golang.org/x/net/ipv6/sys_asmreq_stub.go
+++ b/vendor/golang.org/x/net/ipv6/sys_asmreq_stub.go
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build !aix && !darwin && !dragonfly && !freebsd && !linux && !netbsd && !openbsd && !solaris && !windows
 // +build !aix,!darwin,!dragonfly,!freebsd,!linux,!netbsd,!openbsd,!solaris,!windows
 
 package ipv6
diff --git a/vendor/golang.org/x/net/ipv6/sys_bpf.go b/vendor/golang.org/x/net/ipv6/sys_bpf.go
index 90ef4dfaf43465972164c90f3a56dfb7718443e7..b5661fb8f066b4a156f9a8711dffb948d0fd7972 100644
--- a/vendor/golang.org/x/net/ipv6/sys_bpf.go
+++ b/vendor/golang.org/x/net/ipv6/sys_bpf.go
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build linux
 // +build linux
 
 package ipv6
diff --git a/vendor/golang.org/x/net/ipv6/sys_bpf_stub.go b/vendor/golang.org/x/net/ipv6/sys_bpf_stub.go
index eb9f8316237a2997a4d5d34f2f704c438ec77d2f..cb006618720ac79bb8e3300fc3dd0336df16f51a 100644
--- a/vendor/golang.org/x/net/ipv6/sys_bpf_stub.go
+++ b/vendor/golang.org/x/net/ipv6/sys_bpf_stub.go
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build !linux
 // +build !linux
 
 package ipv6
diff --git a/vendor/golang.org/x/net/ipv6/sys_bsd.go b/vendor/golang.org/x/net/ipv6/sys_bsd.go
index e416eaa1fe4a12d89810c981c4d0b95410ac2dca..63e5ee2d599dd3b6e9a77ab93c1f1b7dc5241490 100644
--- a/vendor/golang.org/x/net/ipv6/sys_bsd.go
+++ b/vendor/golang.org/x/net/ipv6/sys_bsd.go
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build dragonfly || netbsd || openbsd
 // +build dragonfly netbsd openbsd
 
 package ipv6
diff --git a/vendor/golang.org/x/net/ipv6/sys_ssmreq.go b/vendor/golang.org/x/net/ipv6/sys_ssmreq.go
index 9b52e978cbd9dd35b1876883c235bf4e92ae26c5..023488a49cde07c4fdd715e1826646dd8e77f97b 100644
--- a/vendor/golang.org/x/net/ipv6/sys_ssmreq.go
+++ b/vendor/golang.org/x/net/ipv6/sys_ssmreq.go
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build aix darwin freebsd linux solaris
+//go:build aix || darwin || freebsd || linux || solaris || zos
+// +build aix darwin freebsd linux solaris zos
 
 package ipv6
 
diff --git a/vendor/golang.org/x/net/ipv6/sys_ssmreq_stub.go b/vendor/golang.org/x/net/ipv6/sys_ssmreq_stub.go
index d5bc1108c5f2ec42b5bf79f3e0fbeb27d08893ee..acdf2e5cf7c42d5055690b524a0150f520945805 100644
--- a/vendor/golang.org/x/net/ipv6/sys_ssmreq_stub.go
+++ b/vendor/golang.org/x/net/ipv6/sys_ssmreq_stub.go
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build !aix,!darwin,!freebsd,!linux,!solaris
+//go:build !aix && !darwin && !freebsd && !linux && !solaris && !zos
+// +build !aix,!darwin,!freebsd,!linux,!solaris,!zos
 
 package ipv6
 
diff --git a/vendor/golang.org/x/net/ipv6/sys_stub.go b/vendor/golang.org/x/net/ipv6/sys_stub.go
index 4f252d09f6cb7a71426552f0fbd22462e85f5ce7..5807bba39266c0dc1bbb83324973baaea65c8cce 100644
--- a/vendor/golang.org/x/net/ipv6/sys_stub.go
+++ b/vendor/golang.org/x/net/ipv6/sys_stub.go
@@ -2,7 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build !aix,!darwin,!dragonfly,!freebsd,!linux,!netbsd,!openbsd,!solaris,!windows
+//go:build !aix && !darwin && !dragonfly && !freebsd && !linux && !netbsd && !openbsd && !solaris && !windows && !zos
+// +build !aix,!darwin,!dragonfly,!freebsd,!linux,!netbsd,!openbsd,!solaris,!windows,!zos
 
 package ipv6
 
diff --git a/vendor/golang.org/x/net/ipv6/sys_zos.go b/vendor/golang.org/x/net/ipv6/sys_zos.go
new file mode 100644
index 0000000000000000000000000000000000000000..d4567f908fa89b5ea661d5b2259d501986b30e89
--- /dev/null
+++ b/vendor/golang.org/x/net/ipv6/sys_zos.go
@@ -0,0 +1,70 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package ipv6
+
+import (
+	"net"
+	"syscall"
+	"unsafe"
+
+	"golang.org/x/net/internal/iana"
+	"golang.org/x/net/internal/socket"
+)
+
+var (
+	ctlOpts = [ctlMax]ctlOpt{
+		ctlHopLimit:   {sysIPV6_HOPLIMIT, 4, marshalHopLimit, parseHopLimit},
+		ctlPacketInfo: {sysIPV6_PKTINFO, sizeofInet6Pktinfo, marshalPacketInfo, parsePacketInfo},
+		ctlPathMTU:    {sysIPV6_PATHMTU, sizeofIPv6Mtuinfo, marshalPathMTU, parsePathMTU},
+	}
+
+	sockOpts = map[int]*sockOpt{
+		ssoTrafficClass:        {Option: socket.Option{Level: iana.ProtocolIPv6, Name: sysIPV6_TCLASS, Len: 4}},
+		ssoHopLimit:            {Option: socket.Option{Level: iana.ProtocolIPv6, Name: sysIPV6_UNICAST_HOPS, Len: 4}},
+		ssoMulticastInterface:  {Option: socket.Option{Level: iana.ProtocolIPv6, Name: sysIPV6_MULTICAST_IF, Len: 4}},
+		ssoMulticastHopLimit:   {Option: socket.Option{Level: iana.ProtocolIPv6, Name: sysIPV6_MULTICAST_HOPS, Len: 4}},
+		ssoMulticastLoopback:   {Option: socket.Option{Level: iana.ProtocolIPv6, Name: sysIPV6_MULTICAST_LOOP, Len: 4}},
+		ssoReceiveTrafficClass: {Option: socket.Option{Level: iana.ProtocolIPv6, Name: sysIPV6_RECVTCLASS, Len: 4}},
+		ssoReceiveHopLimit:     {Option: socket.Option{Level: iana.ProtocolIPv6, Name: sysIPV6_RECVHOPLIMIT, Len: 4}},
+		ssoReceivePacketInfo:   {Option: socket.Option{Level: iana.ProtocolIPv6, Name: sysIPV6_RECVPKTINFO, Len: 4}},
+		ssoReceivePathMTU:      {Option: socket.Option{Level: iana.ProtocolIPv6, Name: sysIPV6_RECVPATHMTU, Len: 4}},
+		ssoChecksum:            {Option: socket.Option{Level: iana.ProtocolIPv6, Name: sysIPV6_CHECKSUM, Len: 4}},
+		ssoICMPFilter:          {Option: socket.Option{Level: iana.ProtocolIPv6ICMP, Name: sysICMP6_FILTER, Len: sizeofICMPv6Filter}},
+		ssoJoinGroup:           {Option: socket.Option{Level: iana.ProtocolIPv6, Name: sysMCAST_JOIN_GROUP, Len: sizeofGroupReq}, typ: ssoTypeGroupReq},
+		ssoLeaveGroup:          {Option: socket.Option{Level: iana.ProtocolIPv6, Name: sysMCAST_LEAVE_GROUP, Len: sizeofGroupReq}, typ: ssoTypeGroupReq},
+		ssoJoinSourceGroup:     {Option: socket.Option{Level: iana.ProtocolIPv6, Name: sysMCAST_JOIN_SOURCE_GROUP, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq},
+		ssoLeaveSourceGroup:    {Option: socket.Option{Level: iana.ProtocolIPv6, Name: sysMCAST_LEAVE_SOURCE_GROUP, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq},
+		ssoBlockSourceGroup:    {Option: socket.Option{Level: iana.ProtocolIPv6, Name: sysMCAST_BLOCK_SOURCE, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq},
+		ssoUnblockSourceGroup:  {Option: socket.Option{Level: iana.ProtocolIPv6, Name: sysMCAST_UNBLOCK_SOURCE, Len: sizeofGroupSourceReq}, typ: ssoTypeGroupSourceReq},
+	}
+)
+
+func (sa *sockaddrInet6) setSockaddr(ip net.IP, i int) {
+	sa.Family = syscall.AF_INET6
+	copy(sa.Addr[:], ip)
+	sa.Scope_id = uint32(i)
+}
+
+func (pi *inet6Pktinfo) setIfindex(i int) {
+	pi.Ifindex = uint32(i)
+}
+
+func (gr *groupReq) setGroup(grp net.IP) {
+	sa := (*sockaddrInet6)(unsafe.Pointer(&gr.Group))
+	sa.Family = syscall.AF_INET6
+	sa.Len = sizeofSockaddrInet6
+	copy(sa.Addr[:], grp)
+}
+
+func (gsr *groupSourceReq) setSourceGroup(grp, src net.IP) {
+	sa := (*sockaddrInet6)(unsafe.Pointer(&gsr.Group))
+	sa.Family = syscall.AF_INET6
+	sa.Len = sizeofSockaddrInet6
+	copy(sa.Addr[:], grp)
+	sa = (*sockaddrInet6)(unsafe.Pointer(&gsr.Source))
+	sa.Family = syscall.AF_INET6
+	sa.Len = sizeofSockaddrInet6
+	copy(sa.Addr[:], src)
+}
diff --git a/vendor/golang.org/x/net/ipv6/zsys_aix_ppc64.go b/vendor/golang.org/x/net/ipv6/zsys_aix_ppc64.go
index bf44e338bd80c6851a7e19abc9e28ff836f9028a..75e2dd99486da8571f4a3827d6f145af47c8976b 100644
--- a/vendor/golang.org/x/net/ipv6/zsys_aix_ppc64.go
+++ b/vendor/golang.org/x/net/ipv6/zsys_aix_ppc64.go
@@ -2,6 +2,7 @@
 // cgo -godefs defs_aix.go
 
 // Added for go1.11 compatibility
+//go:build aix
 // +build aix
 
 package ipv6
diff --git a/vendor/golang.org/x/net/ipv6/zsys_linux_riscv64.go b/vendor/golang.org/x/net/ipv6/zsys_linux_riscv64.go
index 6083ddcedcbac391a6feaad611b202c3548f4fca..2072c313e9c927bae5ddb910e52da1b7990b1a04 100644
--- a/vendor/golang.org/x/net/ipv6/zsys_linux_riscv64.go
+++ b/vendor/golang.org/x/net/ipv6/zsys_linux_riscv64.go
@@ -1,6 +1,7 @@
 // Code generated by cmd/cgo -godefs; DO NOT EDIT.
 // cgo -godefs defs_linux.go
 
+//go:build riscv64
 // +build riscv64
 
 package ipv6
diff --git a/vendor/golang.org/x/net/ipv6/zsys_zos_s390x.go b/vendor/golang.org/x/net/ipv6/zsys_zos_s390x.go
new file mode 100644
index 0000000000000000000000000000000000000000..3f980691f6be125dd393fd17a6b4d2a5b35646a2
--- /dev/null
+++ b/vendor/golang.org/x/net/ipv6/zsys_zos_s390x.go
@@ -0,0 +1,106 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Hand edited based on zerrors_zos_s390x.go
+// TODO(Bill O'Farrell): auto-generate.
+
+package ipv6
+
+const (
+	sysIPV6_ADDR_PREFERENCES  = 32
+	sysIPV6_CHECKSUM          = 19
+	sysIPV6_DONTFRAG          = 29
+	sysIPV6_DSTOPTS           = 23
+	sysIPV6_HOPLIMIT          = 11
+	sysIPV6_HOPOPTS           = 22
+	sysIPV6_JOIN_GROUP        = 5
+	sysIPV6_LEAVE_GROUP       = 6
+	sysIPV6_MULTICAST_HOPS    = 9
+	sysIPV6_MULTICAST_IF      = 7
+	sysIPV6_MULTICAST_LOOP    = 4
+	sysIPV6_NEXTHOP           = 20
+	sysIPV6_PATHMTU           = 12
+	sysIPV6_PKTINFO           = 13
+	sysIPV6_PREFER_SRC_CGA    = 0x10
+	sysIPV6_PREFER_SRC_COA    = 0x02
+	sysIPV6_PREFER_SRC_HOME   = 0x01
+	sysIPV6_PREFER_SRC_NONCGA = 0x20
+	sysIPV6_PREFER_SRC_PUBLIC = 0x08
+	sysIPV6_PREFER_SRC_TMP    = 0x04
+	sysIPV6_RECVDSTOPTS       = 28
+	sysIPV6_RECVHOPLIMIT      = 14
+	sysIPV6_RECVHOPOPTS       = 26
+	sysIPV6_RECVPATHMTU       = 16
+	sysIPV6_RECVPKTINFO       = 15
+	sysIPV6_RECVRTHDR         = 25
+	sysIPV6_RECVTCLASS        = 31
+	sysIPV6_RTHDR             = 21
+	sysIPV6_RTHDRDSTOPTS      = 24
+	sysIPV6_RTHDR_TYPE_0      = 0
+	sysIPV6_TCLASS            = 30
+	sysIPV6_UNICAST_HOPS      = 3
+	sysIPV6_USE_MIN_MTU       = 18
+	sysIPV6_V6ONLY            = 10
+
+	sysMCAST_JOIN_GROUP         = 40
+	sysMCAST_LEAVE_GROUP        = 41
+	sysMCAST_JOIN_SOURCE_GROUP  = 42
+	sysMCAST_LEAVE_SOURCE_GROUP = 43
+	sysMCAST_BLOCK_SOURCE       = 44
+	sysMCAST_UNBLOCK_SOURCE     = 45
+
+	sysICMP6_FILTER = 0x1
+
+	sizeofSockaddrStorage = 128
+	sizeofICMPv6Filter    = 32
+	sizeofInet6Pktinfo    = 20
+	sizeofIPv6Mtuinfo     = 32
+	sizeofSockaddrInet6   = 28
+	sizeofGroupReq        = 136
+	sizeofGroupSourceReq  = 264
+)
+
+type sockaddrStorage struct {
+	Len      uint8
+	Family   byte
+	ss_pad1  [6]byte
+	ss_align int64
+	ss_pad2  [112]byte
+}
+
+type sockaddrInet6 struct {
+	Len      uint8
+	Family   uint8
+	Port     uint16
+	Flowinfo uint32
+	Addr     [16]byte
+	Scope_id uint32
+}
+
+type inet6Pktinfo struct {
+	Addr    [16]byte
+	Ifindex uint32
+}
+
+type ipv6Mtuinfo struct {
+	Addr sockaddrInet6
+	Mtu  uint32
+}
+
+type groupReq struct {
+	Interface uint32
+	reserved  uint32
+	Group     sockaddrStorage
+}
+
+type groupSourceReq struct {
+	Interface uint32
+	reserved  uint32
+	Group     sockaddrStorage
+	Source    sockaddrStorage
+}
+
+type icmpv6Filter struct {
+	Filt [8]uint32
+}
diff --git a/vendor/modules.txt b/vendor/modules.txt
index 59985b2cda1b4c6bac9b7d9fcc22f933bec7ca18..4aaff1a8f6fedff5abadc58968f20f6aba865c9f 100644
--- a/vendor/modules.txt
+++ b/vendor/modules.txt
@@ -31,7 +31,7 @@ github.com/golang/protobuf/ptypes/timestamp
 github.com/gorilla/handlers
 # github.com/matttproud/golang_protobuf_extensions v1.0.1
 github.com/matttproud/golang_protobuf_extensions/pbutil
-# github.com/miekg/dns v1.1.40
+# github.com/miekg/dns v1.1.43
 ## explicit
 github.com/miekg/dns
 # github.com/openzipkin/zipkin-go v0.2.5
@@ -76,15 +76,13 @@ go.opencensus.io/trace/tracestate
 # golang.org/x/crypto v0.0.0-20210220033148-5ea612d1eb83
 ## explicit
 golang.org/x/crypto/acme
-golang.org/x/crypto/ed25519
-golang.org/x/crypto/ed25519/internal/edwards25519
-# golang.org/x/net v0.0.0-20200625001655-4c5254603344
+# golang.org/x/net v0.0.0-20210226172049-e18ecbb05110
 golang.org/x/net/bpf
 golang.org/x/net/internal/iana
 golang.org/x/net/internal/socket
 golang.org/x/net/ipv4
 golang.org/x/net/ipv6
-# golang.org/x/sync v0.0.0-20201207232520-09787c993a3a
+# golang.org/x/sync v0.0.0-20210220032951-036812b2e83c
 golang.org/x/sync/singleflight
 # golang.org/x/sys v0.0.0-20210603081109-ebe580a85c40
 golang.org/x/sys/internal/unsafeheader