Strip PEM header from OpenSSL.crypto.X509 cert

The dump_certificate method doesn't strip the PEM header. The X509Certificate should be a base64-encoded certificate, minus the header.

Author: bobdoah

signxml/__init__.py

@@ -396,7 +396,7 @@ def sign(self, data, key=None, passphrase=None, cert=None, reference_uri=None, k
                             x509_certificate.text = strip_pem_header(cert)
                         else:
                             from OpenSSL.crypto import dump_certificate, FILETYPE_PEM
-                            x509_certificate.text = dump_certificate(FILETYPE_PEM, cert)
+                            x509_certificate.text = strip_pem_header(dump_certificate(FILETYPE_PEM, cert))
             else:
                 sig_root.append(key_info)
         else: