public static string encrypt(string PlainText, byte[] key, byte[] iv, long AAD, out byte[] outTag)
{
string sR = string.Empty;
try
{
byte[] plainBytes = Encoding.ASCII.GetBytes(PlainText);
GcmBlockCipher cipher = new GcmBlockCipher(new AesFastEngine());
AeadParameters parameters =
new AeadParameters(new KeyParameter(key), 128, iv, null);
var tempAddBytesArr = BitConverter.GetBytes(AAD);
cipher.Init(true, parameters);
foreach (var item in tempAddBytesArr)
{
cipher.ProcessAadByte(item);
}
byte[] encryptedBytes = new byte[cipher.GetOutputSize(plainBytes.Length)];
Int32 retLen = cipher.ProcessBytes
(plainBytes, 0, plainBytes.Length, encryptedBytes, 0);
outTag = cipher.GetMac();
cipher.DoFinal(encryptedBytes, retLen);
sR = Convert.ToBase64String(encryptedBytes, Base64FormattingOptions.None);
}
catch (Exception ex)
{
outTag = new byte[1] {
0x0
};
Console.WriteLine(ex.Message);
Console.WriteLine(ex.StackTrace);
}
return(sR);
}
public void Update(byte input)
{
cipher.ProcessAadByte(input);
}