private static void RunDigitalSignature()
{
Console.WriteLine("Digital Signatures started");
Console.WriteLine();
Console.WriteLine(String.Format("Message before encryption: {0}", _signatureMessage));
byte[] messageToSign = Encoding.UTF8.GetBytes(_signatureMessage);
byte[] hashedDocument;
using (SHA256 sha256 = SHA256.Create())
{
hashedDocument = sha256.ComputeHash(messageToSign);
}
DigitalSignatures DS = new DigitalSignatures();
DS.AssignNewKey();
byte[] signature = DS.SignData(hashedDocument);
Console.WriteLine(String.Format("Digital Signature: {0}", Encoding.UTF8.GetString(signature)));
bool isSignatureVerified = DS.VerifySignature(hashedDocument, signature);
Console.WriteLine(String.Format("Verify Signature Results: {0}", isSignatureVerified.ToString()));
Console.WriteLine();
Console.WriteLine("Digital Signatures ended");
}
private static void RunHybridEncryptionWithDigitalSignature()
{
Console.WriteLine("Hybrid Encryption With Digital Signature started");
Console.WriteLine();
Console.WriteLine(String.Format("Message before encryption: {0}", _hybridWithSignatureMessage));
HybridEncryption HP = new HybridEncryption();
RsaWithRsaParameterKey rsaParams = new RsaWithRsaParameterKey();
rsaParams.AssignNewKeys();
DigitalSignatures DS = new DigitalSignatures();
DS.AssignNewKey();
try
{
EncryptedPacket encryptedBlock = HP.EncryptDataWithSignature(Encoding.UTF8.GetBytes(_hybridWithSignatureMessage), rsaParams, DS);
Console.WriteLine(String.Format("Message after encryption: {0}", Encoding.UTF8.GetString(encryptedBlock.EncryptedData)));
byte[] decryptedData = HP.DecryptDataWithSignature(encryptedBlock, rsaParams, DS);
Console.WriteLine(String.Format("Message after decryption: {0}", Encoding.UTF8.GetString(decryptedData)));
}
catch (CryptographicException CE)
{
Console.WriteLine(String.Format("Hybrid Encryption With Digital Signature failed, Error: {0}", CE.Message));
}
Console.WriteLine();
Console.WriteLine("Hybrid Encryption With Digital Signature ended");
}