text: #!/usr/bin/env python
  #
  # Copyright 2015 clowwindy
  #
  # Licensed under the Apache License, Version 2.0 (the "License"); you may
  # not use this file except in compliance with the License. You may obtain
  # a copy of the License at
  #
  #     http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
  # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
  # License for the specific language governing permissions and limitations
  # under the License.
  
  from __future__ import absolute_import, division, print_function, \
      with_statement
  
  import hashlib
  from ..crypto import openssl
  
  __all__ = ['ciphers']
  
  
  def create_cipher(alg, key, iv, op, crypto_path=None,
                    key_as_bytes=0, d=None, salt=None,
                    i=1, padding=1):
      md5 = hashlib.md5()
      md5.update(key)
      md5.update(iv)
      rc4_key = md5.digest()
      return openssl.OpenSSLStreamCrypto(b'rc4', rc4_key, b'', op, crypto_path)
  
  
  ciphers = {
      'rc4-md5': (16, 16, create_cipher),
  }
  
  
  def test():
      from shadowsocks.crypto import util
  
      cipher = create_cipher('rc4-md5', b'k' * 32, b'i' * 16, 1)
      decipher = create_cipher('rc4-md5', b'k' * 32, b'i' * 16, 0)
  
      util.run_cipher(cipher, decipher)
  
  
  if __name__ == '__main__':
      test()
  