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 EncryptDecryptWithAES()
{
var des = new AESEncryption();
var key = des.GenerateRandomNumber(32);
var iv = des.GenerateRandomNumber(16);
const string original = "Text to encrypt";
var encrypted = des.Encrypt(Encoding.UTF8.GetBytes(original), key, iv);
var decrypted = des.Decrypt(encrypted, key, iv);
var decryptedMessage = Encoding.UTF8.GetString(decrypted);
Console.WriteLine("AES Encryption Demonstration in .NET");
Console.WriteLine("------------------------------------");
Console.WriteLine();
Console.WriteLine("Original Text = " + original);
Console.WriteLine("Encrypted Text = " + Convert.ToBase64String(encrypted));
Console.WriteLine("Decrypted Text = " + decryptedMessage);
}
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);
}
