encrypt.py is renamed to cryptor.py (#780)
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Zou Yong
mengskysama
parent
445a3c9c7e
commit
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1 changed files with 0 additions and 238 deletions
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#!/usr/bin/env python
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#
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# Copyright 2012-2015 clowwindy
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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from __future__ import absolute_import, division, print_function, \
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with_statement
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import os
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import sys
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import hashlib
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import logging
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from shadowsocks import common
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from shadowsocks.crypto import rc4_md5, openssl, sodium, table
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method_supported = {}
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method_supported.update(rc4_md5.ciphers)
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method_supported.update(openssl.ciphers)
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method_supported.update(sodium.ciphers)
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method_supported.update(table.ciphers)
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def random_string(length):
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return os.urandom(length)
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cached_keys = {}
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def try_cipher(key, method=None):
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Encryptor(key, method)
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def EVP_BytesToKey(password, key_len, iv_len):
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# equivalent to OpenSSL's EVP_BytesToKey() with count 1
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# so that we make the same key and iv as nodejs version
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cached_key = '%s-%d-%d' % (password, key_len, iv_len)
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r = cached_keys.get(cached_key, None)
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if r:
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return r
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m = []
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i = 0
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while len(b''.join(m)) < (key_len + iv_len):
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md5 = hashlib.md5()
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data = password
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if i > 0:
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data = m[i - 1] + password
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md5.update(data)
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m.append(md5.digest())
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i += 1
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ms = b''.join(m)
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key = ms[:key_len]
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iv = ms[key_len:key_len + iv_len]
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cached_keys[cached_key] = (key, iv)
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return key, iv
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class Encryptor(object):
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def __init__(self, password, method):
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self.password = password
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self.key = None
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self.method = method
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self.iv_sent = False
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self.cipher_iv = b''
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self.decipher = None
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self.decipher_iv = None
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method = method.lower()
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self._method_info = self.get_method_info(method)
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if self._method_info:
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self.cipher = self.get_cipher(password, method, 1,
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random_string(self._method_info[1]))
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else:
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logging.error('method %s not supported' % method)
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sys.exit(1)
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def get_method_info(self, method):
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method = method.lower()
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m = method_supported.get(method)
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return m
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def iv_len(self):
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return len(self.cipher_iv)
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def get_cipher(self, password, method, op, iv):
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password = common.to_bytes(password)
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m = self._method_info
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if m[0] > 0:
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key, iv_ = EVP_BytesToKey(password, m[0], m[1])
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else:
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# key_length == 0 indicates we should use the key directly
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key, iv = password, b''
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self.key = key
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iv = iv[:m[1]]
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if op == 1:
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# this iv is for cipher not decipher
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self.cipher_iv = iv[:m[1]]
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return m[2](method, key, iv, op)
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def encrypt(self, buf):
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if len(buf) == 0:
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return buf
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if self.iv_sent:
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return self.cipher.update(buf)
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else:
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self.iv_sent = True
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return self.cipher_iv + self.cipher.update(buf)
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def decrypt(self, buf):
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if len(buf) == 0:
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return buf
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if self.decipher is None:
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decipher_iv_len = self._method_info[1]
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decipher_iv = buf[:decipher_iv_len]
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self.decipher_iv = decipher_iv
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self.decipher = self.get_cipher(self.password, self.method, 0,
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iv=decipher_iv)
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buf = buf[decipher_iv_len:]
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if len(buf) == 0:
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return buf
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return self.decipher.update(buf)
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def gen_key_iv(password, method):
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method = method.lower()
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(key_len, iv_len, m) = method_supported[method]
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key = None
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if key_len > 0:
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key, _ = EVP_BytesToKey(password, key_len, iv_len)
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else:
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key = password
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iv = random_string(iv_len)
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return key, iv, m
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def encrypt_all_m(key, iv, m, method, data):
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result = []
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result.append(iv)
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cipher = m(method, key, iv, 1)
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result.append(cipher.update(data))
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return b''.join(result)
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def dencrypt_all(password, method, data):
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result = []
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method = method.lower()
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(key_len, iv_len, m) = method_supported[method]
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key = None
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if key_len > 0:
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key, _ = EVP_BytesToKey(password, key_len, iv_len)
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else:
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key = password
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iv = data[:iv_len]
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data = data[iv_len:]
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cipher = m(method, key, iv, 0)
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result.append(cipher.update(data))
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return b''.join(result), key, iv
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def encrypt_all(password, method, op, data):
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result = []
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method = method.lower()
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(key_len, iv_len, m) = method_supported[method]
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key = None
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if key_len > 0:
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key, _ = EVP_BytesToKey(password, key_len, iv_len)
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else:
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key = password
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if op:
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iv = random_string(iv_len)
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result.append(iv)
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else:
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iv = data[:iv_len]
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data = data[iv_len:]
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cipher = m(method, key, iv, op)
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result.append(cipher.update(data))
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return b''.join(result)
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CIPHERS_TO_TEST = [
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'aes-128-cfb',
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'aes-256-cfb',
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'rc4-md5',
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'salsa20',
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'chacha20',
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'table',
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]
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def test_encryptor():
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from os import urandom
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plain = urandom(10240)
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for method in CIPHERS_TO_TEST:
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logging.warn(method)
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encryptor = Encryptor(b'key', method)
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decryptor = Encryptor(b'key', method)
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cipher = encryptor.encrypt(plain)
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plain2 = decryptor.decrypt(cipher)
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assert plain == plain2
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def test_encrypt_all():
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from os import urandom
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plain = urandom(10240)
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for method in CIPHERS_TO_TEST:
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logging.warn(method)
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cipher = encrypt_all(b'key', method, 1, plain)
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plain2 = encrypt_all(b'key', method, 0, cipher)
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assert plain == plain2
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def test_encrypt_all_m():
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from os import urandom
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plain = urandom(10240)
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for method in CIPHERS_TO_TEST:
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logging.warn(method)
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key, iv, m = gen_key_iv(b'key', method)
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cipher = encrypt_all_m(key, iv, m, method, plain)
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plain2, key, iv = dencrypt_all(b'key', method, cipher)
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assert plain == plain2
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if __name__ == '__main__':
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test_encrypt_all()
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test_encryptor()
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test_encrypt_all_m()
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