public DigitalSignatureVerificationResult VerifySignature(DigitalSignatureVerificationArguments arguments)
{
var res = new DigitalSignatureVerificationResult();
try
{
var rsaProviderSender = new RSACryptoServiceProvider();
rsaProviderSender.FromXmlString(arguments.PublicKeyForSignatureVerification.ToString());
var deformatter = new RSAPKCS1SignatureDeformatter(rsaProviderSender);
deformatter.SetHashAlgorithm(_hashingService.HashAlgorithmCode());
var hashResult = _hashingService.Hash(arguments.CipherText);
res.SignaturesMatch = deformatter.VerifySignature(hashResult.HashedBytes, arguments.Signature);
if (res.SignaturesMatch)
{
var rsaProviderReceiver = new RSACryptoServiceProvider();
rsaProviderReceiver.FromXmlString(arguments.FullKeyForDecryption.ToString());
var decryptedBytes = rsaProviderReceiver.Decrypt(Convert.FromBase64String(arguments.CipherText), false);
res.DecodedText = Encoding.UTF8.GetString(decryptedBytes);
}
res.Success = true;
}
catch (Exception ex)
{
res.ExceptionMessage = ex.Message;
}
return(res);
}
public DigitalSignatureVerificationResult VerifySignature(DigitalSignatureVerificationArguments arguments)
{
var res = new DigitalSignatureVerificationResult();
try
{
var rsaProviderSender = new RSACryptoServiceProvider();
rsaProviderSender.FromXmlString(arguments.PublicKeyForSignatureVerification.ToString());
var deformatter = new RSAPKCS1SignatureDeformatter(rsaProviderSender);
deformatter.SetHashAlgorithm(_hashingService.HashAlgorithmCode());
var hashResult = _hashingService.Hash(arguments.CipherText);
res.SignaturesMatch = deformatter.VerifySignature(hashResult.HashedBytes, arguments.Signature);
if (res.SignaturesMatch)
{
var rsaProviderReceiver = new RSACryptoServiceProvider();
rsaProviderReceiver.FromXmlString(arguments.FullKeyForDecryption.ToString());
var decryptedBytes = rsaProviderReceiver.Decrypt(Convert.FromBase64String(arguments.CipherText), false);
res.DecodedText = Encoding.UTF8.GetString(decryptedBytes);
}
res.Success = true;
}
catch (Exception ex)
{
res.ExceptionMessage = ex.Message;
}
return res;
}