encrypt method

@override FutureOr<int> encrypt(Uint8List inp, int inpOff, int inpLength, Uint8List out, int outOff,)

• inp: the total bytes in plain text
• inpOff: the byte offset to start encryption at
• inpLength: the number of bytes (length) to encrypt
• out: the buffer to write the encrypted output in
• outOff: the byte offset to write the encrypted output to

returns the length of the new encrypted output

Implementation

@override
FutureOr<int> encrypt(
    Uint8List inp, int inpOff, int inpLength, Uint8List out, int outOff) {
  var iv = generateIv();
  out.setAll(outOff, iv);

  var len = _cipher.encrypt(iv, inp, 0, inpLength, out, outOff + 16);

  return len + 16;
}