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annotate MoinMoin/support/md5crypt.py @ 5731:8692137f2ccc

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md5crypt: fix python 2.4 compatibility, untested
author Thomas Waldmann <tw AT waldmann-edv DOT de>
date Fri, 26 Nov 2010 21:21:16 +0100
parents 69668ad0cae7
children
rev   line source
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1 #########################################################
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2 # md5crypt.py
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3 #
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4 # 0423.2000 by michal wallace http://www.sabren.com/
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5 # based on perl's Crypt::PasswdMD5 by Luis Munoz (lem@cantv.net)
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6 # based on /usr/src/libcrypt/crypt.c from FreeBSD 2.2.5-RELEASE
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7 #
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8 # MANY THANKS TO
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9 #
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10 # Carey Evans - http://home.clear.net.nz/pages/c.evans/
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11 # Dennis Marti - http://users.starpower.net/marti1/
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12 #
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13 # For the patches that got this thing working!
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14 #
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15 #########################################################
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16 """md5crypt.py - Provides interoperable MD5-based crypt() function
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17
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18 SYNOPSIS
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19
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20 import md5crypt.py
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21
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22 cryptedpassword = md5crypt.md5crypt(password, salt);
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23
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24 DESCRIPTION
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25
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26 unix_md5_crypt() provides a crypt()-compatible interface to the
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27 rather new MD5-based crypt() function found in modern operating systems.
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28 It's based on the implementation found on FreeBSD 2.2.[56]-RELEASE and
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29 contains the following license in it:
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30
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31 "THE BEER-WARE LICENSE" (Revision 42):
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32 <phk@login.dknet.dk> wrote this file. As long as you retain this notice you
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33 can do whatever you want with this stuff. If we meet some day, and you think
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34 this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
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35
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36 apache_md5_crypt() provides a function compatible with Apache's
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37 .htpasswd files. This was contributed by Bryan Hart <bryan@eai.com>.
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38
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39 """
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40
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41 MAGIC = '$1$' # Magic string
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42 ITOA64 = "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
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43
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44 try:
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45 import hashlib
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46 hash_md5 = hashlib.md5
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47 except ImportError:
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48 # maybe we have python < 2.5 (no hashlib)
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49 import md5
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50 hash_md5 = md5.new
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51
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52
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53 def to64 (v, n):
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54 ret = ''
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55 while (n - 1 >= 0):
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56 n = n - 1
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57 ret = ret + ITOA64[v & 0x3f]
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58 v = v >> 6
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59 return ret
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60
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61
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62 def apache_md5_crypt (pw, salt):
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63 # change the Magic string to match the one used by Apache
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64 return unix_md5_crypt(pw, salt, '$apr1$')
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65
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66
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67 def unix_md5_crypt(pw, salt, magic=None):
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68
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69 if magic==None:
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70 magic = MAGIC
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71
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72 # Take care of the magic string if present
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73 if salt[:len(magic)] == magic:
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74 salt = salt[len(magic):]
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75
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76
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77 # salt can have up to 8 characters:
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78 import string
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79 salt = string.split(salt, '$', 1)[0]
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80 salt = salt[:8]
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81
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82 ctx = pw + magic + salt
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83
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84 md5 = hash_md5()
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85 md5.update(pw + salt + pw)
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86 final = md5.digest()
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87
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88 for pl in range(len(pw),0,-16):
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89 if pl > 16:
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90 ctx = ctx + final[:16]
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91 else:
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92 ctx = ctx + final[:pl]
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93
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94
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95 # Now the 'weird' xform (??)
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96
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97 i = len(pw)
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98 while i:
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99 if i & 1:
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100 ctx = ctx + chr(0) #if ($i & 1) { $ctx->add(pack("C", 0)); }
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101 else:
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102 ctx = ctx + pw[0]
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103 i = i >> 1
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104
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105 md5 = hash_md5()
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106 md5.update(ctx)
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107 final = md5.digest()
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108
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109 # The following is supposed to make
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110 # things run slower.
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111
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112 # my question: WTF???
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113
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114 for i in range(1000):
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115 ctx1 = ''
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116 if i & 1:
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117 ctx1 = ctx1 + pw
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118 else:
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119 ctx1 = ctx1 + final[:16]
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120
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121 if i % 3:
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122 ctx1 = ctx1 + salt
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123
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124 if i % 7:
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125 ctx1 = ctx1 + pw
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126
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127 if i & 1:
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128 ctx1 = ctx1 + final[:16]
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129 else:
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130 ctx1 = ctx1 + pw
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131
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132
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133 md5 = hash_md5()
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134 md5.update(ctx1)
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135 final = md5.digest()
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136
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137
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138 # Final xform
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139
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140 passwd = ''
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141
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142 passwd = passwd + to64((int(ord(final[0])) << 16)
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143 |(int(ord(final[6])) << 8)
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144 |(int(ord(final[12]))),4)
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145
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146 passwd = passwd + to64((int(ord(final[1])) << 16)
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147 |(int(ord(final[7])) << 8)
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148 |(int(ord(final[13]))), 4)
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149
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150 passwd = passwd + to64((int(ord(final[2])) << 16)
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151 |(int(ord(final[8])) << 8)
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152 |(int(ord(final[14]))), 4)
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153
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154 passwd = passwd + to64((int(ord(final[3])) << 16)
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155 |(int(ord(final[9])) << 8)
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156 |(int(ord(final[15]))), 4)
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157
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158 passwd = passwd + to64((int(ord(final[4])) << 16)
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159 |(int(ord(final[10])) << 8)
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160 |(int(ord(final[5]))), 4)
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161
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162 passwd = passwd + to64((int(ord(final[11]))), 2)
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163
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164
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165 return magic + salt + '$' + passwd
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166
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167
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168 ## assign a wrapper function:
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169 md5crypt = unix_md5_crypt
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170
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171 if __name__ == "__main__":
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172 print unix_md5_crypt("cat", "hat")
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173