lib/adapters/stream_cipher_as_block_cipher.dart

// See file LICENSE for more information.

library impl.adapters.stream_cipher_as_block_cipher;

import 'dart:typed_data';

import 'package:pointycastle/api.dart';
import 'package:pointycastle/src/impl/base_block_cipher.dart';

/// An adapter to convert an [StreamCipher] to a [BlockCipher]
class StreamCipherAsBlockCipher extends BaseBlockCipher {
  final StreamCipher streamCipher;
  @override
  final int blockSize;

  /// Create a [BlockCipher] from [streamCipher] simulating the given [blockSize]
  StreamCipherAsBlockCipher(this.blockSize, this.streamCipher);

  @override
  String get algorithmName => streamCipher.algorithmName;

  @override
  void reset() {
    streamCipher.reset();
  }

  @override
  void init(bool forEncryption, CipherParameters? params) {
    streamCipher.init(forEncryption, params);
  }

  @override
  int processBlock(Uint8List inp, int inpOff, Uint8List out, int outOff) {
    streamCipher.processBytes(inp, inpOff, blockSize, out, outOff);
    return blockSize;
  }
}