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 void DigitalSignatureServiceTest()
{
var asymmetricService = new RsaAsymmetricCryptographyService();
var keyPairGenerationResultReceiver = asymmetricService.GenerateAsymmetricKeys(1024);
var keyPairGenerationResultSender = asymmetricService.GenerateAsymmetricKeys(1024);
var digitalSignatureService = new RsaPkcs1DigitalSignatureService(new Sha1ManagedHashingService());
var signatureCreationArgumentsFromSender = new DigitalSignatureCreationArguments()
{
Message = "eper málna körte",
FullKeyForSignature = keyPairGenerationResultSender.FullKeyPairXml,
PublicKeyForEncryption = keyPairGenerationResultReceiver.PublicKeyOnlyXml
};
var signatureCreationResult = digitalSignatureService.Sign(signatureCreationArgumentsFromSender);
Assert.AreEqual(true, signatureCreationResult.Success);
var verificationArgumentsFromReceiver = new DigitalSignatureVerificationArguments();
verificationArgumentsFromReceiver.CipherText = signatureCreationResult.CipherText;
verificationArgumentsFromReceiver.Signature = signatureCreationResult.Signature;
verificationArgumentsFromReceiver.PublicKeyForSignatureVerification = keyPairGenerationResultSender.PublicKeyOnlyXml;
verificationArgumentsFromReceiver.FullKeyForDecryption = keyPairGenerationResultReceiver.FullKeyPairXml;
var verificationResult = digitalSignatureService.VerifySignature(verificationArgumentsFromReceiver);
Assert.AreEqual(true, verificationResult.Success);
Assert.AreEqual(true, verificationResult.SignaturesMatch);
}
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;
}
