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127 lines
3.9 KiB
127 lines
3.9 KiB
#!/usr/bin/env python
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# Copyright (c) 2012 clowwindy
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in
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# all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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# SOFTWARE.
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import sys
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import hashlib
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import string
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import struct
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import logging
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def get_table(key):
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m = hashlib.md5()
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m.update(key)
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s = m.digest()
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(a, b) = struct.unpack('<QQ', s)
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table = [c for c in string.maketrans('', '')]
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for i in xrange(1, 1024):
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table.sort(lambda x, y: int(a % (ord(x) + i) - a % (ord(y) + i)))
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return table
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encrypt_table = None
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decrypt_table = None
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def init_table(key, method=None):
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if method == 'table':
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method = None
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if method:
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try:
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__import__('M2Crypto')
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except ImportError:
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logging.error('M2Crypto is required to use encryption other than default method')
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sys.exit(1)
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if not method:
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global encrypt_table, decrypt_table
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encrypt_table = ''.join(get_table(key))
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decrypt_table = string.maketrans(encrypt_table, string.maketrans('', ''))
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else:
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get_cipher(key, method, 1)
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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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# TODO: cache the results
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m = []
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i = 0
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while len(''.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 = ''.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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return (key, iv)
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method_supported = {
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'aes-128-cfb': (16, 16),
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'aes-192-cfb': (24, 16),
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'aes-256-cfb': (32, 16),
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'bf-cfb': (16, 8),
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'cast5-cfb': (16, 8),
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'des-cfb': (8, 8),
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'rc4': (16, 0),
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}
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def get_cipher(password, method, op):
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import M2Crypto.EVP
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password = password.encode('utf-8')
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method = method.lower()
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m = method_supported.get(method, None)
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if m:
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key, iv = EVP_BytesToKey(password, m[0], m[1])
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return M2Crypto.EVP.Cipher(method.replace('-', '_'), key, iv, op, key_as_bytes=0, d='md5', salt=None, i=1, padding=1)
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logging.error('method %s not supported' % method)
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sys.exit(1)
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class Encryptor(object):
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def __init__(self, key, method=None):
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if method == 'table':
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method = None
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self.method = method
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if method is not None:
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self.cipher = get_cipher(key, method, 1)
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self.decipher = get_cipher(key, method, 0)
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else:
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self.cipher = None
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self.decipher = None
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def encrypt(self, buf):
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if self.cipher is None:
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return string.translate(buf, encrypt_table)
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else:
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return self.cipher.update(buf)
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def decrypt(self, buf):
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if self.cipher is None:
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return string.translate(buf, decrypt_table)
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else:
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return self.decipher.update(buf)
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