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# -*- coding: utf-8 -*-
"""
pbkdf2_ctypes
~~~~~~
Fast pbkdf2.
This module implements pbkdf2 for Python using crypto lib from
openssl or commoncrypto.
Note: This module is intended as a plugin replacement of pbkdf2.py
by Armin Ronacher.
Git repository:
$ git clone https://github.com/michele-comitini/pbkdf2_ctypes.git
:copyright: Copyright (c) 2013: Michele Comitini <mcm@glisco.it>
:license: LGPLv3
"""
import ctypes
import ctypes.util
import hashlib
import platform
import os.path
import binascii
import sys
__all__ = ['pkcs5_pbkdf2_hmac', 'pbkdf2_bin', 'pbkdf2_hex']
__version__ = '0.99.3'
def _commoncrypto_hashlib_to_crypto_map_get(hashfunc):
hashlib_to_crypto_map = {hashlib.sha1: 1,
hashlib.sha224: 2,
hashlib.sha256: 3,
hashlib.sha384: 4,
hashlib.sha512: 5}
crypto_hashfunc = hashlib_to_crypto_map.get(hashfunc)
if crypto_hashfunc is None:
raise ValueError('Unkwnown digest %s' % hashfunc)
return crypto_hashfunc
def _commoncrypto_pbkdf2(data, salt, iterations, digest, keylen):
"""Common Crypto compatibile wrapper
"""
c_hashfunc = ctypes.c_uint32(_commoncrypto_hashlib_to_crypto_map_get(digest))
c_pass = ctypes.c_char_p(data)
c_passlen = ctypes.c_size_t(len(data))
c_salt = ctypes.c_char_p(salt)
c_saltlen = ctypes.c_size_t(len(salt))
c_iter = ctypes.c_uint(iterations)
c_keylen = ctypes.c_size_t(keylen)
c_buff = ctypes.create_string_buffer(keylen)
crypto.CCKeyDerivationPBKDF.restype = ctypes.c_int
crypto.CCKeyDerivationPBKDF.argtypes = [ctypes.c_uint32,
ctypes.c_char_p,
ctypes.c_size_t,
ctypes.c_char_p,
ctypes.c_size_t,
ctypes.c_uint32,
ctypes.c_uint,
ctypes.c_char_p,
ctypes.c_size_t]
ret = crypto.CCKeyDerivationPBKDF(2, # hardcoded 2-> PBKDF2
c_pass, c_passlen,
c_salt, c_saltlen,
c_hashfunc,
c_iter,
c_buff,
c_keylen)
return (1 - ret, c_buff)
def _openssl_hashlib_to_crypto_map_get(hashfunc):
hashlib_to_crypto_map = {hashlib.md5: crypto.EVP_md5,
hashlib.sha1: crypto.EVP_sha1,
hashlib.sha256: crypto.EVP_sha256,
hashlib.sha224: crypto.EVP_sha224,
hashlib.sha384: crypto.EVP_sha384,
hashlib.sha512: crypto.EVP_sha512}
crypto_hashfunc = hashlib_to_crypto_map.get(hashfunc)
if crypto_hashfunc is None:
raise ValueError('Unkwnown digest %s' % hashfunc)
crypto_hashfunc.restype = ctypes.c_void_p
return crypto_hashfunc()
def _openssl_pbkdf2(data, salt, iterations, digest, keylen):
"""OpenSSL compatibile wrapper
"""
c_hashfunc = ctypes.c_void_p(_openssl_hashlib_to_crypto_map_get(digest))
c_pass = ctypes.c_char_p(data)
c_passlen = ctypes.c_int(len(data))
c_salt = ctypes.c_char_p(salt)
c_saltlen = ctypes.c_int(len(salt))
c_iter = ctypes.c_int(iterations)
c_keylen = ctypes.c_int(keylen)
c_buff = ctypes.create_string_buffer(keylen)
# PKCS5_PBKDF2_HMAC(const char *pass, int passlen,
# const unsigned char *salt, int saltlen, int iter,
# const EVP_MD *digest,
# int keylen, unsigned char *out);
crypto.PKCS5_PBKDF2_HMAC.argtypes = [ctypes.c_char_p, ctypes.c_int,
ctypes.c_char_p, ctypes.c_int,
ctypes.c_int, ctypes.c_void_p,
ctypes.c_int, ctypes.c_char_p]
crypto.PKCS5_PBKDF2_HMAC.restype = ctypes.c_int
err = crypto.PKCS5_PBKDF2_HMAC(c_pass, c_passlen,
c_salt, c_saltlen,
c_iter,
c_hashfunc,
c_keylen,
c_buff)
return (err, c_buff)
try: # check that we have proper OpenSSL or Common Crypto on the system.
system = platform.system()
if system == 'Windows':
if platform.architecture()[0] == '64bit':
libname = ctypes.util.find_library('libeay64')
if not libname:
raise OSError('Library not found')
crypto = ctypes.CDLL(libname)
else:
libname = ctypes.util.find_library('libeay32')
if not libname:
raise OSError('Library libeay32 not found.')
crypto = ctypes.CDLL(libname)
_pbkdf2_hmac = _openssl_pbkdf2
crypto.PKCS5_PBKDF2_HMAC # test compatibility
elif system == 'Darwin': # think different(TM)! i.e. break things!
if [int(x) for x in platform.mac_ver()[0].split('.')] < [10, 7, 0]:
raise OSError('OS X Version too old %s < 10.7.0' % platform.mac_ver()[0])
libname = ctypes.util.find_library('System')
if not libname:
raise OSError('Library not found')
crypto = ctypes.CDLL(os.path.basename(libname))
_pbkdf2_hmac = _commoncrypto_pbkdf2
else:
libname = ctypes.util.find_library('crypto')
if not libname:
raise OSError('Library crypto not found.')
crypto = ctypes.CDLL(os.path.basename(libname))
_pbkdf2_hmac = _openssl_pbkdf2
crypto.PKCS5_PBKDF2_HMAC # test compatibility
except (OSError, AttributeError):
_, e, _ = sys.exc_info()
raise ImportError('Cannot find a compatible cryptographic library '
'on your system. %s' % e)
def pkcs5_pbkdf2_hmac(data, salt, iterations=1000, keylen=24, hashfunc=None):
if hashfunc is None:
hashfunc = hashlib.sha1
err, c_buff = _pbkdf2_hmac(data, salt, iterations, hashfunc, keylen)
if err == 0:
raise ValueError('wrong parameters')
return c_buff.raw[:keylen]
def pbkdf2_hex(data, salt, iterations=1000, keylen=24, hashfunc=None):
return binascii.hexlify(pkcs5_pbkdf2_hmac(data, salt, iterations, keylen, hashfunc))
def pbkdf2_bin(data, salt, iterations=1000, keylen=24, hashfunc=None):
return pkcs5_pbkdf2_hmac(data, salt, iterations, keylen, hashfunc)
if __name__ == '__main__':
try:
crypto.SSLeay_version.restype = ctypes.c_char_p
print(crypto.SSLeay_version(0))
except:
pass
import platform
if platform.python_version_tuple() < ('3', '0', '0'):
def bytes(*args):
return str(args[0])
for h in [hashlib.sha1, hashlib.sha224, hashlib.sha256,
hashlib.sha384, hashlib.sha512]:
print(binascii.hexlify(pkcs5_pbkdf2_hmac(bytes('secret', 'utf-8') * 11,
bytes('salt', 'utf-8'),
hashfunc=h)))
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