I have attempted to sign a entities descriptor file, but the signature is always incorrect. xmlsectool states that the signature is expected digest is not the same as the actual digest.
xmlsectool-2.0.0/xmlsectool.sh --verifySignature --certificate saml.crt --inFile example.xml
INFO XMLSecTool - Reading XML document from file 'example.xml'
INFO XMLSecTool - XML document parsed and is well-formed.
WARN Reference - Verification failed for URI "#id1234"
WARN Reference - Expected Digest: D+SEh34cA7/atdQ8ojV9rzUcJcJSAslFZ0aOIwplGfI=
WARN Reference - Actual Digest: EYun0wngsN35ci20wRziCXs0Io7J4bZN+NYRnnTR5QM=
ERROR XMLSecTool - XML document signature verification failed
I followed the README example on goxmldsig to create the following code. The full example is on pastebin(stackoverflow wouldn't let me post it here).
xmlBytes := []byte(`<></>`)
keyPair, err := tls.X509KeyPair(certBytes, keyBytes)
failOnError(err, "invalided to load keypair")
keyStore := dsig.TLSCertKeyStore(keyPair)
signingContext := dsig.NewDefaultSigningContext(keyStore)
signingContext.Canonicalizer = dsig.MakeC14N10ExclusiveCanonicalizerWithPrefixList("")
err = signingContext.SetSignatureMethod(dsig.RSASHA256SignatureMethod)
failOnError(err, "failed to set signature method")
readXMLDoc := etree.NewDocument()
err = readXMLDoc.ReadFromBytes(xmlBytes)
failOnError(err, "cannot parse xml")
elementToSign := readXMLDoc.Root()
elementToSign.CreateAttr("ID", "id1234")
signedElement, err := signingContext.SignEnveloped(elementToSign)
failOnError(err, "failed to sign envelop")
var signedAssertionBuf []byte
{
readXMLDoc.SetRoot(signedElement)
signedAssertionBuf, err = readXMLDoc.WriteToBytes()
failOnError(err, "failed to convert doc to bytes")
}
ioutil.WriteFile("/tmp/test/example.xml", signedAssertionBuf, 0775)