5Xc@sdZddlmZddlZddlmZmZddlmZddl m Z m Z m Z m Z ddlmZdd gZd d d d ddgZejdZdZdZdS(spasslib.crypto._blowfish - pure-python eks-blowfish implementation for bcrypt This is a pure-python implementation of the EKS-Blowfish algorithm described by Provos and Mazieres in `A Future-Adaptable Password Scheme `_. This package contains two submodules: * ``_blowfish/base.py`` contains a class implementing the eks-blowfish algorithm using easy-to-examine code. * ``_blowfish/unrolled.py`` contains a subclass which replaces some methods of the original class with sped-up versions, mainly using unrolled loops and local variables. this is the class which is actually used by Passlib to perform BCrypt in pure python. This module is auto-generated by a script, ``_blowfish/_gen_files.py``. Status ------ This implementation is usable, but is an order of magnitude too slow to be usable with real security. For "ok" security, BCrypt hashes should have at least 2**11 rounds (as of 2011). Assuming a desired response time <= 100ms, this means a BCrypt implementation should get at least 20 rounds/ms in order to be both usable *and* secure. On a 2 ghz cpu, this implementation gets roughly 0.09 rounds/ms under CPython (220x too slow), and 1.9 rounds/ms under PyPy (10x too slow). History ------- While subsequently modified considerly for Passlib, this code was originally based on `jBcrypt 0.2 `_, which was released under the BSD license:: Copyright (c) 2006 Damien Miller Permission to use, copy, modify, and distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies. THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. i(tchainN(t getrandbytestrng(tbcrypt64(tBytesIOtunicodetutnative_string_types(tBlowfishEngineRt raw_bcryptihprOiBnaeiloheiSrediDyrcitbuos>6Itc Cs6t|tstt}|tdks|tdks|tdkrTnO|tdkrot}n4|tdkrtdntd|ft|tsttj |}t |dkrtd nt |dkr|d }nt|tst|r/|t 7}n|d ksG|d krVtd nt }|j |}|j |}|d }|j||d |>} |j||| tt} d} xM| dkr|j| | | | d d\| | <| | d <| d7} qWtj| d } tj| S(sSperform central password hashing step in bcrypt scheme. :param password: the password to hash :param ident: identifier w/ minor version (e.g. 2, 2a) :param salt: the binary salt to use (encoded in bcrypt-base64) :param log_rounds: the log2 of the number of rounds (as int) :returns: bcrypt-base64 encoded checksum t2at2yt2bt2t2xs>crypt_blowfish's buggy '2x' hashes are not currently supportedsunknown ident: %risMissing salt bytesiisBad number of roundsiiii@ii(t isinstanceRtAssertionErrortTrueRtFalset ValueErrortbytesRt decode_bytestlentBNULLRt key_to_wordsteks_salted_expandteks_repeated_expandtlistt BCRYPT_CDATAtrepeat_enciphert digest_structtpackt encode_bytes( tpasswordtidenttsaltt log_roundstadd_null_paddingtenginet pass_wordst salt_wordst salt_words16troundstdatatitraw((sE/usr/lib/python2.7/site-packages/passlib/crypto/_blowfish/__init__.pyR XsD6       3(t__doc__t itertoolsRtstructt passlib.utilsRRtpasslib.utils.binaryRtpasslib.utils.compatRRRRt!passlib.crypto._blowfish.unrolledRt__all__RtStructRRR (((sE/usr/lib/python2.7/site-packages/passlib/crypto/_blowfish/__init__.pyt1s "