public void RsaEncode(System.Numerics.BigInteger key, System.Numerics.BigInteger modulus)
{
var length = offset;
offset = 0;
var data = new byte[length];
GetBytes(data, 0, length);
var biginteger2 = new System.Numerics.BigInteger(data);
System.Numerics.BigInteger biginteger3 = biginteger2.modPow(key, modulus);
byte[] @out = biginteger3.toByteArray();
offset = 0;
WriteBytes(@out, 0, @out.Length);
}