private static void TestHybridWithIntegrityAndSignatures()
{
const string original = "Very secret and important information that must not fall in the hands of the enemy.";
var rsaParams = new RSAWithRSAParameterKey();
rsaParams.AssignNewKey();
var fullHybridEncryption = new FullHybridEncryption();
var digitalSignature = new DigitalSignatureFuncs();
digitalSignature.AssignNewKey();
try
{
var encryptedBlock = fullHybridEncryption.EncryptData(Encoding.UTF8.GetBytes(original), rsaParams, digitalSignature);
var decryptedBlock = fullHybridEncryption.DecryptData(encryptedBlock, rsaParams, digitalSignature);
Console.WriteLine($"Original Message: {original}");
Console.WriteLine($"Encrypted Block Data: {Convert.ToBase64String(encryptedBlock.EncryptedData)}");
Console.WriteLine($"Decrypted Block: {Convert.ToBase64String(decryptedBlock)}");
Console.WriteLine($"Decrypted Message: {Encoding.UTF8.GetString(decryptedBlock)}");
}
catch (CryptographicException ex)
{
Console.WriteLine($"Cryptographic Exception occured: {ex.Message}");
}
}
private static void TestDigitalSignature()
{
var document = Encoding.UTF8.GetBytes("Document to Sign");
byte[] hashedDocument;
using (var sha256 = SHA256.Create())
{
hashedDocument = sha256.ComputeHash(document);
}
var digitalSignature = new DigitalSignatureFuncs();
digitalSignature.AssignNewKey();
var signature = digitalSignature.SignData(hashedDocument);
var verified = digitalSignature.VerifySignature(hashedDocument, signature);
Console.WriteLine($"Original Text: {Encoding.Default.GetString(document)}");
Console.WriteLine($"Digital Signature: {Convert.ToBase64String(signature)}");
Console.WriteLine(verified ? "The digital signature has been verified." : "The digital signature has NOT been verified.");
}
