encryptBlock method

@override List<int> encryptBlock(List<int> src, [ List<int>? dst, PaddingAlgorithm? paddingStyle = PaddingAlgorithm.pkcs7 ])

Encrypts a single data block using the Electronic Codebook (ECB) mode.

Parameters:

• src: The data block to be encrypted.
• dst: (Optional) The destination for the encrypted block. If not provided, a new List<int> is created.
• paddingStyle: (Optional) The padding style to be applied before encryption (default is PKCS#7).

Implementation

@override
List<int> encryptBlock(
  List<int> src, [
  List<int>? dst,
  PaddingAlgorithm? paddingStyle = PaddingAlgorithm.pkcs7,
]) {
  if (paddingStyle == null) {
    if ((src.length % blockSize) != 0) {
      throw ArgumentException.invalidOperationArguments(
        "encryptBlock",
        name: "src",
        reason: "Invalid source bytes length.",
      );
    }
  }
  List<int> input = src.clone();
  if (paddingStyle != null) {
    input = BlockCipherPadding.pad(input, blockSize, style: paddingStyle);
  }

  final out = dst ?? List<int>.filled(input.length, 0);
  if (out.length != input.length) {
    throw ArgumentException.invalidOperationArguments(
      "encryptBlock",
      name: "out",
      reason: "Incorrect destination length.",
    );
  }
  final numBlocks = input.length ~/ blockSize;
  for (var i = 0; i < numBlocks; i++) {
    final start = i * blockSize;
    final end = (i + 1) * blockSize;
    final List<int> block = input.sublist(start, end);
    final enc = super.encryptBlock(block);
    out.setRange(start, end, enc);
  }
  return out;
}