Python port of ShadowsocksR
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#!/usr/bin/env python
# Copyright (c) 2014 clowwindy
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
from __future__ import absolute_import, division, print_function, \
with_statement
from ctypes import c_char_p, c_int, c_long, byref,\
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create_string_buffer, c_void_p
from shadowsocks.crypto import util
__all__ = ['ciphers']
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libcrypto = None
loaded = False
buf_size = 2048
def load_openssl():
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global loaded, libcrypto, buf
libcrypto = util.find_library(('crypto', 'eay32'),
'EVP_get_cipherbyname',
'libcrypto')
if libcrypto is None:
raise Exception('libcrypto(OpenSSL) not found')
libcrypto.EVP_get_cipherbyname.restype = c_void_p
libcrypto.EVP_CIPHER_CTX_new.restype = c_void_p
libcrypto.EVP_CipherInit_ex.argtypes = (c_void_p, c_void_p, c_char_p,
c_char_p, c_char_p, c_int)
libcrypto.EVP_CipherUpdate.argtypes = (c_void_p, c_void_p, c_void_p,
c_char_p, c_int)
libcrypto.EVP_CIPHER_CTX_cleanup.argtypes = (c_void_p,)
libcrypto.EVP_CIPHER_CTX_free.argtypes = (c_void_p,)
if hasattr(libcrypto, 'OpenSSL_add_all_ciphers'):
libcrypto.OpenSSL_add_all_ciphers()
buf = create_string_buffer(buf_size)
loaded = True
def load_cipher(cipher_name):
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func_name = b'EVP_' + cipher_name.replace(b'-', b'_')
if bytes != str:
func_name = str(func_name, 'utf-8')
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cipher = getattr(libcrypto, func_name, None)
if cipher:
cipher.restype = c_void_p
return cipher()
return None
class OpenSSLCrypto(object):
def __init__(self, cipher_name, key, iv, op):
self._ctx = None
if not loaded:
load_openssl()
cipher = libcrypto.EVP_get_cipherbyname(cipher_name)
if not cipher:
cipher = load_cipher(cipher_name)
if not cipher:
raise Exception('cipher %s not found in libcrypto' % cipher_name)
key_ptr = c_char_p(key)
iv_ptr = c_char_p(iv)
self._ctx = libcrypto.EVP_CIPHER_CTX_new()
if not self._ctx:
raise Exception('can not create cipher context')
r = libcrypto.EVP_CipherInit_ex(self._ctx, cipher, None,
key_ptr, iv_ptr, c_int(op))
if not r:
self.clean()
raise Exception('can not initialize cipher context')
def update(self, data):
global buf_size, buf
cipher_out_len = c_long(0)
l = len(data)
if buf_size < l:
buf_size = l * 2
buf = create_string_buffer(buf_size)
libcrypto.EVP_CipherUpdate(self._ctx, byref(buf),
byref(cipher_out_len), c_char_p(data), l)
# buf is copied to a str object when we access buf.raw
return buf.raw[:cipher_out_len.value]
def __del__(self):
self.clean()
def clean(self):
if self._ctx:
libcrypto.EVP_CIPHER_CTX_cleanup(self._ctx)
libcrypto.EVP_CIPHER_CTX_free(self._ctx)
ciphers = {
b'aes-128-cfb': (16, 16, OpenSSLCrypto),
b'aes-192-cfb': (24, 16, OpenSSLCrypto),
b'aes-256-cfb': (32, 16, OpenSSLCrypto),
b'aes-128-ofb': (16, 16, OpenSSLCrypto),
b'aes-192-ofb': (24, 16, OpenSSLCrypto),
b'aes-256-ofb': (32, 16, OpenSSLCrypto),
b'aes-128-ctr': (16, 16, OpenSSLCrypto),
b'aes-192-ctr': (24, 16, OpenSSLCrypto),
b'aes-256-ctr': (32, 16, OpenSSLCrypto),
b'aes-128-cfb8': (16, 16, OpenSSLCrypto),
b'aes-192-cfb8': (24, 16, OpenSSLCrypto),
b'aes-256-cfb8': (32, 16, OpenSSLCrypto),
b'aes-128-cfb1': (16, 16, OpenSSLCrypto),
b'aes-192-cfb1': (24, 16, OpenSSLCrypto),
b'aes-256-cfb1': (32, 16, OpenSSLCrypto),
b'bf-cfb': (16, 8, OpenSSLCrypto),
b'camellia-128-cfb': (16, 16, OpenSSLCrypto),
b'camellia-192-cfb': (24, 16, OpenSSLCrypto),
b'camellia-256-cfb': (32, 16, OpenSSLCrypto),
b'cast5-cfb': (16, 8, OpenSSLCrypto),
b'des-cfb': (8, 8, OpenSSLCrypto),
b'idea-cfb': (16, 8, OpenSSLCrypto),
b'rc2-cfb': (16, 8, OpenSSLCrypto),
b'rc4': (16, 0, OpenSSLCrypto),
b'seed-cfb': (16, 16, OpenSSLCrypto),
}
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def run_method(method):
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cipher = OpenSSLCrypto(method, b'k' * 32, b'i' * 16, 1)
decipher = OpenSSLCrypto(method, b'k' * 32, b'i' * 16, 0)
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util.run_cipher(cipher, decipher)
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def test_aes_128_cfb():
run_method(b'aes-128-cfb')
def test_aes_256_cfb():
run_method(b'aes-256-cfb')
def test_aes_128_cfb8():
run_method(b'aes-128-cfb8')
def test_aes_256_ofb():
run_method(b'aes-256-ofb')
def test_aes_256_ctr():
run_method(b'aes-256-ctr')
def test_bf_cfb():
run_method(b'bf-cfb')
def test_rc4():
run_method(b'rc4')
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if __name__ == '__main__':
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test_aes_128_cfb()