private bool CheckSignedInfo(KeyedHashAlgorithm macAlg)
{
if (macAlg == null)
{
throw new ArgumentNullException(nameof(macAlg));
}
SignedXmlDebugLog.LogBeginCheckSignedInfo(this, m_signature.SignedInfo);
int signatureLength;
if (m_signature.SignedInfo.SignatureLength == null)
{
signatureLength = macAlg.HashSize;
}
else
{
signatureLength = Convert.ToInt32(m_signature.SignedInfo.SignatureLength, null);
}
// signatureLength should be less than hash size
if (signatureLength < 0 || signatureLength > macAlg.HashSize)
{
throw new CryptographicException(SR.Cryptography_Xml_InvalidSignatureLength);
}
if (signatureLength % 8 != 0)
{
throw new CryptographicException(SR.Cryptography_Xml_InvalidSignatureLength2);
}
if (m_signature.SignatureValue == null)
{
throw new CryptographicException(SR.Cryptography_Xml_SignatureValueRequired);
}
if (m_signature.SignatureValue.Length != signatureLength / 8)
{
throw new CryptographicException(SR.Cryptography_Xml_InvalidSignatureLength);
}
// Calculate the hash
byte[] hashValue = GetC14NDigest(macAlg);
SignedXmlDebugLog.LogVerifySignedInfo(this, macAlg, hashValue, m_signature.SignatureValue);
for (int i = 0; i < m_signature.SignatureValue.Length; i++)
{
if (m_signature.SignatureValue[i] != hashValue[i])
{
return(false);
}
}
return(true);
}
private bool CheckSignedInfo(AsymmetricAlgorithm key)
{
if (key == null)
{
throw new ArgumentNullException(nameof(key));
}
SignedXmlDebugLog.LogBeginCheckSignedInfo(this, m_signature.SignedInfo);
SignatureDescription signatureDescription = CryptoHelpers.CreateFromName <SignatureDescription>(SignatureMethod);
if (signatureDescription == null)
{
throw new CryptographicException(SR.Cryptography_Xml_SignatureDescriptionNotCreated);
}
// Let's see if the key corresponds with the SignatureMethod
Type ta = Type.GetType(signatureDescription.KeyAlgorithm);
if (!IsKeyTheCorrectAlgorithm(key, ta))
{
return(false);
}
HashAlgorithm hashAlgorithm = signatureDescription.CreateDigest();
if (hashAlgorithm == null)
{
throw new CryptographicException(SR.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));
}
