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222 lines
6.5 KiB
222 lines
6.5 KiB
#!/usr/bin/env python
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#
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# Copyright 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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from ctypes import c_char_p, c_int, c_long, byref, \
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create_string_buffer, c_void_p
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from shadowsocks import common
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from shadowsocks.crypto import util
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__all__ = ['ciphers']
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libcrypto = None
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loaded = False
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buf_size = 2048
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ctx_cleanup = None
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def load_openssl():
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global loaded, libcrypto, buf, ctx_cleanup
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libcrypto = util.find_library(('crypto', 'eay32'),
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'EVP_get_cipherbyname',
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'libcrypto')
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if libcrypto is None:
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raise Exception('libcrypto(OpenSSL) not found')
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libcrypto.EVP_get_cipherbyname.restype = c_void_p
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libcrypto.EVP_CIPHER_CTX_new.restype = c_void_p
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libcrypto.EVP_CipherInit_ex.argtypes = (c_void_p, c_void_p, c_char_p,
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c_char_p, c_char_p, c_int)
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libcrypto.EVP_CipherUpdate.argtypes = (c_void_p, c_void_p, c_void_p,
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c_char_p, c_int)
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if hasattr(libcrypto, "EVP_CIPHER_CTX_cleanup"):
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libcrypto.EVP_CIPHER_CTX_cleanup.argtypes = (c_void_p,)
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ctx_cleanup = libcrypto.EVP_CIPHER_CTX_cleanup
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else:
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libcrypto.EVP_CIPHER_CTX_reset.argtypes = (c_void_p,)
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ctx_cleanup = libcrypto.EVP_CIPHER_CTX_reset
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libcrypto.EVP_CIPHER_CTX_free.argtypes = (c_void_p,)
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libcrypto.RAND_bytes.restype = c_int
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libcrypto.RAND_bytes.argtypes = (c_void_p, c_int)
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if hasattr(libcrypto, 'OpenSSL_add_all_ciphers'):
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libcrypto.OpenSSL_add_all_ciphers()
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buf = create_string_buffer(buf_size)
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loaded = True
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def load_cipher(cipher_name):
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func_name = 'EVP_' + cipher_name.replace('-', '_')
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cipher = getattr(libcrypto, func_name, None)
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if cipher:
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cipher.restype = c_void_p
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return cipher()
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return None
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def rand_bytes(length):
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if not loaded:
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load_openssl()
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buf = create_string_buffer(length)
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r = libcrypto.RAND_bytes(buf, length)
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if r <= 0:
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raise Exception('RAND_bytes return error')
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return buf.raw
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class OpenSSLCrypto(object):
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def __init__(self, cipher_name, key, iv, op):
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self._ctx = None
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if not loaded:
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load_openssl()
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cipher = libcrypto.EVP_get_cipherbyname(common.to_bytes(cipher_name))
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if not cipher:
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cipher = load_cipher(cipher_name)
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if not cipher:
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raise Exception('cipher %s not found in libcrypto' % cipher_name)
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key_ptr = c_char_p(key)
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iv_ptr = c_char_p(iv)
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self._ctx = libcrypto.EVP_CIPHER_CTX_new()
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if not self._ctx:
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raise Exception('can not create cipher context')
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r = libcrypto.EVP_CipherInit_ex(self._ctx, cipher, None,
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key_ptr, iv_ptr, c_int(op))
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if not r:
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self.clean()
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raise Exception('can not initialize cipher context')
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def update(self, data):
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global buf_size, buf
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cipher_out_len = c_long(0)
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l = len(data)
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if buf_size < l:
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buf_size = l * 2
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buf = create_string_buffer(buf_size)
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libcrypto.EVP_CipherUpdate(self._ctx, byref(buf),
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byref(cipher_out_len), c_char_p(data), l)
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# buf is copied to a str object when we access buf.raw
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return buf.raw[:cipher_out_len.value]
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def __del__(self):
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self.clean()
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def clean(self):
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if self._ctx:
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ctx_cleanup(self._ctx)
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libcrypto.EVP_CIPHER_CTX_free(self._ctx)
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self._ctx = None
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ciphers = {
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# CBC mode need a special use way that different from other.
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# CBC mode encrypt message with 16n length, and need 16n+1 length space to decrypt it , otherwise don't decrypt it
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'aes-128-cbc': (16, 16, OpenSSLCrypto),
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'aes-192-cbc': (24, 16, OpenSSLCrypto),
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'aes-256-cbc': (32, 16, OpenSSLCrypto),
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'aes-128-gcm': (16, 16, OpenSSLCrypto),
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'aes-192-gcm': (24, 16, OpenSSLCrypto),
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'aes-256-gcm': (32, 16, OpenSSLCrypto),
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'aes-128-cfb': (16, 16, OpenSSLCrypto),
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'aes-192-cfb': (24, 16, OpenSSLCrypto),
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'aes-256-cfb': (32, 16, OpenSSLCrypto),
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'aes-128-ofb': (16, 16, OpenSSLCrypto),
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'aes-192-ofb': (24, 16, OpenSSLCrypto),
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'aes-256-ofb': (32, 16, OpenSSLCrypto),
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'aes-128-ctr': (16, 16, OpenSSLCrypto),
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'aes-192-ctr': (24, 16, OpenSSLCrypto),
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'aes-256-ctr': (32, 16, OpenSSLCrypto),
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'aes-128-cfb8': (16, 16, OpenSSLCrypto),
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'aes-192-cfb8': (24, 16, OpenSSLCrypto),
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'aes-256-cfb8': (32, 16, OpenSSLCrypto),
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'aes-128-cfb1': (16, 16, OpenSSLCrypto),
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'aes-192-cfb1': (24, 16, OpenSSLCrypto),
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'aes-256-cfb1': (32, 16, OpenSSLCrypto),
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'bf-cfb': (16, 8, OpenSSLCrypto),
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'camellia-128-cfb': (16, 16, OpenSSLCrypto),
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'camellia-192-cfb': (24, 16, OpenSSLCrypto),
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'camellia-256-cfb': (32, 16, OpenSSLCrypto),
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'cast5-cfb': (16, 8, OpenSSLCrypto),
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'des-cfb': (8, 8, OpenSSLCrypto),
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'idea-cfb': (16, 8, OpenSSLCrypto),
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'rc2-cfb': (16, 8, OpenSSLCrypto),
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'rc4': (16, 0, OpenSSLCrypto),
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'seed-cfb': (16, 16, OpenSSLCrypto),
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}
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def run_method(method):
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cipher = OpenSSLCrypto(method, b'k' * 32, b'i' * 16, 1)
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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():
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run_method('aes-128-cfb')
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def test_aes_256_cfb():
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run_method('aes-256-cfb')
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def test_aes_128_cfb8():
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run_method('aes-128-cfb8')
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def test_aes_256_ofb():
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run_method('aes-256-ofb')
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def test_aes_256_ctr():
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run_method('aes-256-ctr')
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def test_bf_cfb():
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run_method('bf-cfb')
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def test_rc4():
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run_method('rc4')
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def test_all():
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for k, v in ciphers.items():
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print(k)
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try:
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run_method(k)
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except AssertionError as e:
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eprint("AssertionError===========" + k)
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eprint(e)
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def eprint(*args, **kwargs):
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import sys
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print(*args, file=sys.stderr, **kwargs)
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if __name__ == '__main__':
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test_all()
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