pbkdf2 static method

List<int> pbkdf2({
  1. required List<int> bytes,
  2. required List<int> salt,
  3. required int iterations,
  4. required int keyLength,
  5. required Hash hashAlgorithm,
})

Implements PBKDF2 (Password-Based Key Derivation Function 2).

This is a simplified implementation for demonstration purposes. In a production environment, consider using a dedicated PBKDF2 library.

Implementation

static List<int> pbkdf2({
  required List<int> bytes,
  required List<int> salt,
  required int iterations,
  required int keyLength,
  required Hash hashAlgorithm,
}) {
  final hmac = Hmac(hashAlgorithm, bytes);
  final blockCount = (keyLength / hashAlgorithm.blockSize).ceil();
  final result = List<int>.filled(keyLength, 0);

  for (var i = 1; i <= blockCount; i++) {
    final block = _pbkdf2Block(hmac, salt, iterations, i);
    final offset = (i - 1) * hashAlgorithm.blockSize;
    final length = i == blockCount
        ? keyLength - (blockCount - 1) * hashAlgorithm.blockSize
        : hashAlgorithm.blockSize;

    for (var j = 0; j < length; j++) {
      if (offset + j < result.length) {
        result[offset + j] = block[j];
      }
    }
  }

  return result;
}