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 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);
}