public void EncryptAES(IWriteStream writeStream, string sharedSecret)
{
if (!IsEncrypt)
{
return;
}
using (var aesAlg = new RijndaelManaged()) {
var key = new Rfc2898DeriveBytes(sharedSecret, _salt);
aesAlg.Key = key.GetBytes(aesAlg.KeySize / 8);
var encryptor = aesAlg.CreateEncryptor(aesAlg.Key, aesAlg.IV);
var byteFragment = writeStream.ToByteFragment();
using (var resultStream = new MemoryStream()) {
using (var csEncrypt = new CryptoStream(resultStream, encryptor, CryptoStreamMode.Write)) {
csEncrypt.Write(byteFragment.Buffer, byteFragment.Offset, byteFragment.Count);
}
writeStream.Reset();
writeStream.ShiftLeft(aesAlg.IV);
var ivLength = (ushort)aesAlg.IV.Length;
writeStream.ShiftLeft(ivLength);
writeStream.ShiftRight((ushort)byteFragment.Count);
var bytes = resultStream.ToArray();
writeStream.ShiftRight(bytes);
}
}
}
