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package acmeserver
import (
"context"
"crypto"
"crypto/ecdsa"
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"crypto/x509/pkix"
"log"
"math/big"
"time"
)
type selfSignedGenerator struct{}
// NewSelfSignedCertGenerator returns a CertGenerator that will create
// self-signed certificates for every request. Primarily useful for
// testing acmeserver as a functional component in integration tests.
func NewSelfSignedCertGenerator() CertGenerator {
return &selfSignedGenerator{}
}
func (g *selfSignedGenerator) GetCertificate(_ context.Context, priv crypto.Signer, c *certConfig) ([][]byte, *x509.Certificate, error) {
notBefore := time.Now()
notAfter := notBefore.AddDate(1, 0, 0)
serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
if err != nil {
return nil, nil, err
}
template := x509.Certificate{
SerialNumber: serialNumber,
Subject: pkix.Name{
CommonName: c.Names[0],
},
DNSNames: c.Names,
NotBefore: notBefore,
NotAfter: notAfter,
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
BasicConstraintsValid: true,
}
der, err := x509.CreateCertificate(rand.Reader, &template, &template, publicKey(priv), priv)
if err != nil {
return nil, nil, err
}
cert, err := x509.ParseCertificate(der)
if err != nil {
return nil, nil, err
}
log.Printf("created certificate for %s", c.Names[0])
return [][]byte{der}, cert, nil
}
func publicKey(priv interface{}) interface{} {
switch k := priv.(type) {
case *rsa.PrivateKey:
return &k.PublicKey
case *ecdsa.PrivateKey:
return &k.PublicKey
default:
return nil
}
}