public EncryptedPacket EncryptData(byte[] original, RSAWithRSAParameterKey rsaParams, DigitalSignatureFuncs digitalSignature)
{
// 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);
// Calculate a HMAC
encryptedPacket.HMAC = HMac.ComputeHMACSha256(encryptedPacket.EncryptedData, sessionKey);
// Generate digital signature of packet to send
encryptedPacket.Signature = digitalSignature.SignData(encryptedPacket.HMAC);
return(encryptedPacket);
}
public static EncryptedPacket EncryptData(string original, RSAWithRSAParameterKey rsaParams)
{
var aes = new AesEncryption();
var sessionKey = RandomCryptography.Random.GenerateRandomNumber(32);
var encryptedPacket = new EncryptedPacket
{
Iv = RandomCryptography.Random.GenerateRandomNumber(16)
};
// Encrypt data with AES and AES key with RSA.
encryptedPacket.EncryptedData = aes.Encrypt(Encoding.UTF8.GetBytes(original), sessionKey, encryptedPacket.Iv);
encryptedPacket.EncryptedSessionKey = rsaParams.EncryptData(sessionKey);
return(encryptedPacket);
}
private static void TestRSAWithRSAParameterKey()
{
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($"Original Text: {original}");
Console.WriteLine($"Encrypted RSA Params: {Convert.ToBase64String(encryptedRSAParams)}");
Console.WriteLine($"Decrypted RSA Params: {Convert.ToBase64String(decryptedRSAParams)}");
Console.WriteLine($"Decrypted Text: {Encoding.Default.GetString(decryptedRSAParams)}");
}
public EncryptedPacket EncryptData(byte[] original, RSAWithRSAParameterKey rsaParams)
{
var sessionKey = _aes.GenerateRandomNumber(32);
var encryptedPacket = new EncryptedPacket {
Iv = _aes.GenerateRandomNumber(12)
};
(byte[] ciphereText, byte[] tag)encrypted = _aes.Encrypt(original, sessionKey, encryptedPacket.Iv, null);
encryptedPacket.EncryptedData = encrypted.ciphereText;
encryptedPacket.Tag = encrypted.tag;
encryptedPacket.EncryptedSessionKey = rsaParams.EncryptData(sessionKey);
return(encryptedPacket);
}
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);
}