private bool CheckSignedInfo(AsymmetricAlgorithm key) { if (key == null) { throw new ArgumentNullException("key"); } SignedXmlDebugLog.LogBeginCheckSignedInfo(this, this.m_signature.SignedInfo); SignatureDescription signatureDescription = CryptoConfig.CreateFromName(this.SignatureMethod) as SignatureDescription; if (signatureDescription == null) { throw new CryptographicException(SecurityResources.GetResourceString("Cryptography_Xml_SignatureDescriptionNotCreated")); } Type c = Type.GetType(signatureDescription.KeyAlgorithm); Type type = key.GetType(); if (((c != type) && !c.IsSubclassOf(type)) && !type.IsSubclassOf(c)) { return false; } HashAlgorithm hash = signatureDescription.CreateDigest(); if (hash == null) { throw new CryptographicException(SecurityResources.GetResourceString("Cryptography_Xml_CreateHashAlgorithmFailed")); } byte[] actualHashValue = this.GetC14NDigest(hash); AsymmetricSignatureDeformatter asymmetricSignatureDeformatter = signatureDescription.CreateDeformatter(key); SignedXmlDebugLog.LogVerifySignedInfo(this, key, signatureDescription, hash, asymmetricSignatureDeformatter, actualHashValue, this.m_signature.SignatureValue); return asymmetricSignatureDeformatter.VerifySignature(actualHashValue, this.m_signature.SignatureValue); }
private bool CheckSignedInfo (AsymmetricAlgorithm key) { if (key == null) throw new ArgumentNullException("key"); SignedXmlDebugLog.LogBeginCheckSignedInfo(this, m_signature.SignedInfo); SignatureDescription signatureDescription = CryptoConfig.CreateFromName(SignatureMethod) as SignatureDescription; if (signatureDescription == null) throw new CryptographicException(SecurityResources.GetResourceString("Cryptography_Xml_SignatureDescriptionNotCreated")); // Let's see if the key corresponds with the SignatureMethod Type ta = Type.GetType(signatureDescription.KeyAlgorithm); Type tb = key.GetType(); if ((ta != tb) && !ta.IsSubclassOf(tb) && !tb.IsSubclassOf(ta)) // Signature method key mismatch return false; HashAlgorithm hashAlgorithm = signatureDescription.CreateDigest(); if (hashAlgorithm == null) throw new CryptographicException(SecurityResources.GetResourceString("Cryptography_Xml_CreateHashAlgorithmFailed")); byte[] hashval = GetC14NDigest(hashAlgorithm); AsymmetricSignatureDeformatter asymmetricSignatureDeformatter = signatureDescription.CreateDeformatter(key); SignedXmlDebugLog.LogVerifySignedInfo(this, key, signatureDescription, hashAlgorithm, asymmetricSignatureDeformatter, hashval, m_signature.SignatureValue); return asymmetricSignatureDeformatter.VerifySignature(hashval, m_signature.SignatureValue); }