encryptBlock method

@override List<int> encryptBlock(List<int> src, [ List<int>? dst ])

Encrypt exactly 1 block (16 bytes)

Implementation

@override
List<int> encryptBlock(List<int> src, [List<int>? dst]) {
  final out = dst ?? List<int>.filled(blockSize, 0);
  if (src.length != blockSize) {
    throw ArgumentException.invalidOperationArguments(
      "encryptBlock",
      name: "src",
      reason: "Invalid source bytes length.",
    );
  }
  if (out.length != blockSize) {
    throw ArgumentException.invalidOperationArguments(
      "encryptBlock",
      name: "dst",
      reason: "Invalid destination bytes length.",
    );
  }
  // CBC: XOR plaintext with previous ciphertext
  for (int i = 0; i < blockSize; i++) {
    _tmpBlock[i] = (src[i] ^ _prevBlock[i]).toU8;
  }
  // Encrypt XORed block
  _cipher.encryptBlock(_tmpBlock, out);

  // Update previous block for next round
  _prevBlock.setAll(0, out);
  return out;
}