md5crypt.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Wed, 28 Apr 2010 12:15:52 +0200
brancholdstable
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replace logilab-common by CubicWeb in disclaimer
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#########################################################
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# copyright 2003-2010 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
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# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
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#
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# This file is part of CubicWeb.
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#
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# CubicWeb is free software: you can redistribute it and/or modify it under the
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# terms of the GNU Lesser General Public License as published by the Free
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# Software Foundation, either version 2.1 of the License, or (at your option)
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# any later version.
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#
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# CubicWeb is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
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# details.
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#
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# You should have received a copy of the GNU Lesser General Public License along
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# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.
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"""
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XXX clarify this header
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"""
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# md5crypt.py
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#
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# 0423.2000 by michal wallace http://www.sabren.com/
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# based on perl's Crypt::PasswdMD5 by Luis Munoz (lem@cantv.net)
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# based on /usr/src/libcrypt/crypt.c from FreeBSD 2.2.5-RELEASE
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#
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# MANY THANKS TO
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#
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#  Carey Evans - http://home.clear.net.nz/pages/c.evans/
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#  Dennis Marti - http://users.starpower.net/marti1/
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#
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#  For the patches that got this thing working!
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#
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# modification by logilab:
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# * remove usage of the string module
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# * don't include the magic string in the output string
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#   for true crypt.crypt compatibility
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#########################################################
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"""md5crypt.py - Provides interoperable MD5-based crypt() function
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SYNOPSIS
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        import md5crypt.py
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        cryptedpassword = md5crypt.md5crypt(password, salt);
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DESCRIPTION
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unix_md5_crypt() provides a crypt()-compatible interface to the
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rather new MD5-based crypt() function found in modern operating systems.
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It's based on the implementation found on FreeBSD 2.2.[56]-RELEASE and
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contains the following license in it:
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 "THE BEER-WARE LICENSE" (Revision 42):
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 <phk@login.dknet.dk> wrote this file.  As long as you retain this notice you
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 can do whatever you want with this stuff. If we meet some day, and you think
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 this stuff is worth it, you can buy me a beer in return.   Poul-Henning Kamp
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"""
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MAGIC = '$1$'                        # Magic string
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ITOA64 = "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
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import md5
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def to64 (v, n):
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    ret = ''
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    while (n - 1 >= 0):
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        n = n - 1
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        ret = ret + ITOA64[v & 0x3f]
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        v = v >> 6
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    return ret
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def crypt(pw, salt, magic=None):
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    if isinstance(pw, unicode):
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        pw = pw.encode('utf-8')
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    if magic is None:
0
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        magic = MAGIC
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    # Take care of the magic string if present
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    if salt[:len(magic)] == magic:
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        salt = salt[len(magic):]
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    # salt can have up to 8 characters:
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    salt = salt.split('$', 1)[0]
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    salt = salt[:8]
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    ctx = pw + magic + salt
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    final = md5.md5(pw + salt + pw).digest()
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    for pl in xrange(len(pw), 0, -16):
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        if pl > 16:
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            ctx = ctx + final[:16]
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        else:
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            ctx = ctx + final[:pl]
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    # Now the 'weird' xform (??)
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    i = len(pw)
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    while i:
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        if i & 1:
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            ctx = ctx + chr(0)  #if ($i & 1) { $ctx->add(pack("C", 0)); }
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        else:
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            ctx = ctx + pw[0]
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        i = i >> 1
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    final = md5.md5(ctx).digest()
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    # The following is supposed to make
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    # things run slower.
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    # my question: WTF???
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    for i in xrange(1000):
0
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        ctx1 = ''
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        if i & 1:
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            ctx1 = ctx1 + pw
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        else:
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            ctx1 = ctx1 + final[:16]
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        if i % 3:
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            ctx1 = ctx1 + salt
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        if i % 7:
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            ctx1 = ctx1 + pw
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        if i & 1:
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            ctx1 = ctx1 + final[:16]
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        else:
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            ctx1 = ctx1 + pw
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        final = md5.md5(ctx1).digest()
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    # Final xform
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    passwd = ''
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    passwd = passwd + to64((int(ord(final[0])) << 16)
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                           |(int(ord(final[6])) << 8)
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                           |(int(ord(final[12]))),4)
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    passwd = passwd + to64((int(ord(final[1])) << 16)
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                           |(int(ord(final[7])) << 8)
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                           |(int(ord(final[13]))), 4)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   127
    passwd = passwd + to64((int(ord(final[2])) << 16)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   128
                           |(int(ord(final[8])) << 8)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   129
                           |(int(ord(final[14]))), 4)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   130
    passwd = passwd + to64((int(ord(final[3])) << 16)
b97547f5f1fa Showtime !
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   131
                           |(int(ord(final[9])) << 8)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   132
                           |(int(ord(final[15]))), 4)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   133
    passwd = passwd + to64((int(ord(final[4])) << 16)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   134
                           |(int(ord(final[10])) << 8)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   135
                           |(int(ord(final[5]))), 4)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   136
    passwd = passwd + to64((int(ord(final[11]))), 2)
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Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
diff changeset
   137
    return salt + '$' + passwd