source: TracAccountManager/0.10/acct_mgr/md5crypt.py @ 13

Last change on this file since 13 was 2, checked in by guillaume, 17 years ago

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1# -*- coding: utf-8 -*-
2#
3# Based on FreeBSD src/lib/libcrypt/crypt.c 1.2
4# http://www.freebsd.org/cgi/cvsweb.cgi/~checkout~/src/lib/libcrypt/crypt.c?rev=1.2&content-type=text/plain
5
6# Original license:
7# * "THE BEER-WARE LICENSE" (Revision 42):
8# * <phk@login.dknet.dk> wrote this file.  As long as you retain this notice you
9# * can do whatever you want with this stuff. If we meet some day, and you think
10# * this stuff is worth it, you can buy me a beer in return.   Poul-Henning Kamp
11
12# This port adds no further stipulations.  I forfeit any copyright interest.
13
14import md5
15
16def md5crypt(password, salt, magic='$1$'):
17    # /* The password first, since that is what is most unknown */ /* Then our magic string */ /* Then the raw salt */
18    m = md5.new()
19    m.update(password + magic + salt)
20
21    # /* Then just as many characters of the MD5(pw,salt,pw) */
22    mixin = md5.md5(password + salt + password).digest()
23    for i in range(0, len(password)):
24        m.update(mixin[i % 16])
25
26    # /* Then something really weird... */
27    # Also really broken, as far as I can tell.  -m
28    i = len(password)
29    while i:
30        if i & 1:
31            m.update('\x00')
32        else:
33            m.update(password[0])
34        i >>= 1
35
36    final = m.digest()
37
38    # /* and now, just to make sure things don't run too fast */
39    for i in range(1000):
40        m2 = md5.md5()
41        if i & 1:
42            m2.update(password)
43        else:
44            m2.update(final)
45
46        if i % 3:
47            m2.update(salt)
48
49        if i % 7:
50            m2.update(password)
51
52        if i & 1:
53            m2.update(final)
54        else:
55            m2.update(password)
56
57        final = m2.digest()
58
59    # This is the bit that uses to64() in the original code.
60
61    itoa64 = './0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'
62
63    rearranged = ''
64    for a, b, c in ((0, 6, 12), (1, 7, 13), (2, 8, 14), (3, 9, 15), (4, 10, 5)):
65        v = ord(final[a]) << 16 | ord(final[b]) << 8 | ord(final[c])
66        for i in range(4):
67            rearranged += itoa64[v & 0x3f]; v >>= 6
68
69    v = ord(final[11])
70    for i in range(2):
71        rearranged += itoa64[v & 0x3f]; v >>= 6
72
73    return magic + salt + '$' + rearranged
74
75if __name__ == '__main__':
76
77    def test(clear_password, the_hash):
78        magic, salt = the_hash[1:].split('$')[:2]
79        magic = '$' + magic + '$'
80        return md5crypt(clear_password, salt, magic) == the_hash
81
82    test_cases = (
83        (' ', '$1$yiiZbNIH$YiCsHZjcTkYd31wkgW8JF.'),
84        ('pass', '$1$YeNsbWdH$wvOF8JdqsoiLix754LTW90'),
85        ('____fifteen____', '$1$s9lUWACI$Kk1jtIVVdmT01p0z3b/hw1'),
86        ('____sixteen_____', '$1$dL3xbVZI$kkgqhCanLdxODGq14g/tW1'),
87        ('____seventeen____', '$1$NaH5na7J$j7y8Iss0hcRbu3kzoJs5V.'),
88        ('__________thirty-three___________', '$1$HO7Q6vzJ$yGwp2wbL5D7eOVzOmxpsy.'),
89        ('apache', '$apr1$J.w5a/..$IW9y6DR0oO/ADuhlMF5/X1')
90    )
91
92    for clearpw, hashpw in test_cases:
93        if test(clearpw, hashpw):
94            print '%s: pass' % clearpw
95        else:
96            print '%s: FAIL' % clearpw
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