public static void HybridIntergityCheckEncrypDecrypt()
{
const string original = "Very secret and important information that can not into the hacker.";
var hybrid = new HybridEncryptionIntegirtyCheck();
var rsaParams = new RSAWithRSAParameterKey();
rsaParams.AssignNewKey();
Console.WriteLine("Hybrid Encryption with Integrity Check Demonstration in .NET");
Console.WriteLine("------------------------------------------------------------");
Console.WriteLine();
try
{
var encryptedBlock = hybrid.EncryptData(Encoding.UTF8.GetBytes(original), rsaParams);
var decrypted = hybrid.DecryptData(encryptedBlock, rsaParams);
Console.WriteLine("Original Message = " + original);
Console.WriteLine();
Console.WriteLine("Message After Decryption = " + Encoding.UTF8.GetString(decrypted));
}
catch (CryptographicException ex)
{
Console.WriteLine("Error : " + ex.Message);
}
}
public byte[] DecryptData(EncryptedPacket encryptedpacket, RSAWithRSAParameterKey rsaParams)
{
// Decrypt AES Key with RSA
var decryptedSessionKey = rsaParams.DecryptData(encryptedpacket.EncryptedSessionKey);
// Decrypt our data with AES using the decrypted session key
var decryptedData = _aes.Decrypt(encryptedpacket.EncryptedData,
decryptedSessionKey, encryptedpacket.Iv);
return(decryptedData);
}
public EncryptedPacket EncryptData(byte[] original, RSAWithRSAParameterKey rsaParams)
{
// Generate our session key.
var sessionKey = _aes.GenerateRandomNumber(32);
// Create the encrypted packet and generate the IV
var encryptedPacket = new EncryptedPacket {
Iv = _aes.GenerateRandomNumber(16)
};
// Encrypt our data with AES
encryptedPacket.EncryptedData = _aes.Encrypt(original, sessionKey, encryptedPacket.Iv);
// Encrypt the session key with RSA
encryptedPacket.EncryptedSessionKey = rsaParams.EncryptData(sessionKey);
return(encryptedPacket);
}
public static void HyrbidEncrypDecrypt()
{
const string original = "Very secret and important information that can not into the hacker.";
var rsaParams = new RSAWithRSAParameterKey();
rsaParams.AssignNewKey();
var hybrid = new HybridEncryption();
var encryptedBlock = hybrid.EncryptData(Encoding.UTF8.GetBytes(original), rsaParams);
var decrypted = hybrid.DecryptData(encryptedBlock, rsaParams);
Console.WriteLine("Hybrid Encryption Demonstration in .NET");
Console.WriteLine("---------------------------------------");
Console.WriteLine();
Console.WriteLine("Original Message = " + original);
Console.WriteLine();
Console.WriteLine("Message After Decruption = " + Encoding.UTF8.GetString(decrypted));
}
public byte[] DecryptData(EncryptedPacketIntegrityCheck encryptedpacket, RSAWithRSAParameterKey rsaParams)
{
// Decrypt AES Key with RSA
var decryptedSessionKey = rsaParams.DecryptData(encryptedpacket.EncryptedSessionKey);
using (var hmac = new HMACSHA256(decryptedSessionKey))
{
var hmacToCheck = hmac.ComputeHash(encryptedpacket.EncryptedData);
if (!Comparer(encryptedpacket.Hmac, hmacToCheck))
{
throw new CryptographicException("HMAC for decryption does not match");
}
}
// Decrypt our data with AES using the decrypted session key
var decryptedData = _aes.Decrypt(encryptedpacket.EncryptedData,
decryptedSessionKey, encryptedpacket.Iv);
return(decryptedData);
}
public static void EncryptDecryptWithRSAWithRSAParameterKey()
{
var rsaParams = new RSAWithRSAParameterKey();
const string original = "Text to encrypt";
rsaParams.AssignNewKey();
var encryptedRsaParams = rsaParams.EncryptData(Encoding.UTF8.GetBytes(original));
var decryptedRsaParams = rsaParams.DecryptData(encryptedRsaParams);
Console.WriteLine("RSA Encryption Demonstration in .NET");
Console.WriteLine("------------------------------------");
Console.WriteLine();
Console.WriteLine("In Memory Key");
Console.WriteLine();
Console.WriteLine("Original Text = " + original);
Console.WriteLine();
Console.WriteLine("Encrypted Text = " + Convert.ToBase64String(encryptedRsaParams));
Console.WriteLine();
Console.WriteLine("Decrypted Text = " + Encoding.Default.GetString(decryptedRsaParams));
Console.WriteLine();
Console.WriteLine();
}
public EncryptedPacketIntegrityCheck EncryptData(byte[] original, RSAWithRSAParameterKey rsaParams)
{
// Generate our session key.
var sessionKey = _aes.GenerateRandomNumber(32);
// Create the encrypted packet and generate the IV
var encryptedPacket = new EncryptedPacketIntegrityCheck {
Iv = _aes.GenerateRandomNumber(16)
};
// Encrypt our data with AES
encryptedPacket.EncryptedData = _aes.Encrypt(original, sessionKey, encryptedPacket.Iv);
// Encrypt the session key with RSA
encryptedPacket.EncryptedSessionKey = rsaParams.EncryptData(sessionKey);
using (var hmac = new HMACSHA256(sessionKey))
{
encryptedPacket.Hmac = hmac.ComputeHash(encryptedPacket.EncryptedData);
}
return(encryptedPacket);
}