// XMLSecDSigCtxCreate calls xmlSecDSigCtxCreate with a nil parameter
// and returns a pointer to the new struct
func XMLSecDSigCtxCreate(mngr PtrSource) (uintptr, error) {
// It's okay to have a nil keys manager, so ignore
// errors from validKeysMngrPtr
mngrptr, _ := validKeysMngrPtr(mngr)
ctx := C.xmlSecDSigCtxCreate(mngrptr)
if ctx == nil {
return 0, errors.New("failed to create DSigCtx")
}
return uintptr(unsafe.Pointer(ctx)), nil
}
// Sign returns a version of doc signed with key according to
// the XMLDSIG standard. doc is a template document meaning
// that it contains an `http://www.w3.org/2000/09/xmldsig#Signature`
// element whose properties define how and what to sign.
func Sign(key []byte, doc []byte, opts SignatureOptions) ([]byte, error) {
startProcessingXML()
defer stopProcessingXML()
ctx := C.xmlSecDSigCtxCreate(nil)
if ctx == nil {
return nil, errors.New("failed to create signature context")
}
defer C.xmlSecDSigCtxDestroy(ctx)
ctx.signKey = C.xmlSecCryptoAppKeyLoadMemory(
(*C.xmlSecByte)(unsafe.Pointer(&key[0])),
C.xmlSecSize(len(key)),
C.xmlSecKeyDataFormatPem,
nil, nil, nil)
if ctx.signKey == nil {
return nil, errors.New("failed to load pem key")
}
parsedDoc, err := newDoc(doc, opts.XMLID)
if err != nil {
return nil, err
}
defer closeDoc(parsedDoc)
node := C.xmlSecFindNode(C.xmlDocGetRootElement(parsedDoc),
(*C.xmlChar)(unsafe.Pointer(&C.xmlSecNodeSignature)),
(*C.xmlChar)(unsafe.Pointer(&C.xmlSecDSigNs)))
if node == nil {
return nil, errors.New("cannot find start node")
}
if rv := C.xmlSecDSigCtxSign(ctx, node); rv < 0 {
return nil, errors.New("failed to sign")
}
return dumpDoc(parsedDoc), nil
}
// Verify checks that the signature in doc is valid according
// to the XMLDSIG specification. publicKey is the public part of
// the key used to sign doc. If the signature is not correct,
// this function returns ErrVerificationFailed.
func Verify(publicKey []byte, doc []byte, opts SignatureOptions) error {
startProcessingXML()
defer stopProcessingXML()
keysMngr := C.xmlSecKeysMngrCreate()
if keysMngr == nil {
return mustPopError()
}
defer C.xmlSecKeysMngrDestroy(keysMngr)
if rv := C.xmlSecCryptoAppDefaultKeysMngrInit(keysMngr); rv < 0 {
return mustPopError()
}
key := C.xmlSecCryptoAppKeyLoadMemory(
(*C.xmlSecByte)(unsafe.Pointer(&publicKey[0])),
C.xmlSecSize(len(publicKey)),
C.xmlSecKeyDataFormatCertPem,
nil, nil, nil)
if key == nil {
return mustPopError()
}
if rv := C.xmlSecCryptoAppKeyCertLoadMemory(key,
(*C.xmlSecByte)(unsafe.Pointer(&publicKey[0])),
C.xmlSecSize(len(publicKey)),
C.xmlSecKeyDataFormatCertPem); rv < 0 {
C.xmlSecKeyDestroy(key)
return mustPopError()
}
if rv := C.xmlSecCryptoAppDefaultKeysMngrAdoptKey(keysMngr, key); rv < 0 {
return mustPopError()
}
dsigCtx := C.xmlSecDSigCtxCreate(keysMngr)
if dsigCtx == nil {
return mustPopError()
}
defer C.xmlSecDSigCtxDestroy(dsigCtx)
parsedDoc, err := newDoc(doc, opts.XMLID)
if err != nil {
return err
}
defer closeDoc(parsedDoc)
node := C.xmlSecFindNode(C.xmlDocGetRootElement(parsedDoc),
(*C.xmlChar)(unsafe.Pointer(&C.xmlSecNodeSignature)),
(*C.xmlChar)(unsafe.Pointer(&C.xmlSecDSigNs)))
if node == nil {
return errors.New("cannot find start node")
}
if rv := C.xmlSecDSigCtxVerify(dsigCtx, node); rv < 0 {
return ErrVerificationFailed
}
if dsigCtx.status != xmlSecDSigStatusSucceeded {
return ErrVerificationFailed
}
return nil
}