switch the digest default to SHA2

cam/ca.py

@@ -28,7 +28,7 @@ class CA(object):
         self.basedir = basedir
         self.config = {'basedir': basedir, 'default_days': '365', 'ou': 'CA',
                        'days': '3650', 'country': 'XX', 'crl_url': '',
-                       'signature_algorithm': 'sha1', 'bits': '2048'}
+                       'signature_algorithm': 'sha256', 'bits': '2048'}
         self.config.update(config)
         self.files = _CAFiles(basedir, 
                               conf='conf/ca.conf',

cam/tests/test_ca.py

@@ -53,15 +53,15 @@ class CATest(unittest.TestCase):
         self.assertTrue(os.path.exists(cert.public_key_file))
         self.assertTrue(os.path.exists(cert.private_key_file))
 
-    def test_create_cert_with_sha2_signature(self):
-        self.ca.config['signature_algorithm'] = 'sha256'
+    def test_create_cert_with_digest_override(self):
+        self.ca.config['signature_algorithm'] = 'md5'
         self.ca.create()
         cert = CertStub('test', 'www.test.com', self.tmpdir)
         self.ca.generate(cert)
         self.assertTrue(os.path.exists(cert.public_key_file))
         self.assertTrue(os.path.exists(cert.private_key_file))
         self.assertTrue(
-            'Signature Algorithm: sha256WithRSAEncryption' in subprocess.check_output(
+            'Signature Algorithm: md5WithRSAEncryption' in subprocess.check_output(
             ['openssl', 'x509', '-text', '-noout', '-in', cert.public_key_file]))
 
     def test_revoke(self):