Mercurial > cpython-lru_cache-weakref

annotate Lib/hashlib.py @ 58925:eecf1bef052d 2.6

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Merged revisions 78207 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r78207 | ezio.melotti | 2010-02-17 01:26:09 +0200 (Wed, 17 Feb 2010) | 1 line #7930: fix stripid ........
author Ezio Melotti <ezio.melotti@gmail.com>
date Tue, 16 Feb 2010 23:29:44 +0000
parents be63ec748ee0
children 787b969d37f0 746f10e0624e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 # $Id$
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2 #
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3 # Copyright (C) 2005 Gregory P. Smith (greg@krypto.org)
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4 # Licensed to PSF under a Contributor Agreement.
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5 #
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6
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7 __doc__ = """hashlib module - A common interface to many hash functions.
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8
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9 new(name, string='') - returns a new hash object implementing the
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10 given hash function; initializing the hash
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11 using the given string data.
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12
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13 Named constructor functions are also available, these are much faster
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14 than using new():
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15
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16 md5(), sha1(), sha224(), sha256(), sha384(), and sha512()
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17
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18 More algorithms may be available on your platform but the above are
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19 guaranteed to exist.
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20
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21 NOTE: If you want the adler32 or crc32 hash functions they are available in
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22 the zlib module.
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23
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24 Choose your hash function wisely. Some have known collision weaknesses.
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25 sha384 and sha512 will be slow on 32 bit platforms.
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26
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27 Hash objects have these methods:
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28 - update(arg): Update the hash object with the string arg. Repeated calls
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29 are equivalent to a single call with the concatenation of all
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30 the arguments.
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31 - digest(): Return the digest of the strings passed to the update() method
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32 so far. This may contain non-ASCII characters, including
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33 NUL bytes.
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34 - hexdigest(): Like digest() except the digest is returned as a string of
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35 double length, containing only hexadecimal digits.
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36 - copy(): Return a copy (clone) of the hash object. This can be used to
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37 efficiently compute the digests of strings that share a common
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38 initial substring.
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39
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40 For example, to obtain the digest of the string 'Nobody inspects the
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41 spammish repetition':
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42
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43 >>> import hashlib
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44 >>> m = hashlib.md5()
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45 >>> m.update("Nobody inspects")
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46 >>> m.update(" the spammish repetition")
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47 >>> m.digest()
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48 '\\xbbd\\x9c\\x83\\xdd\\x1e\\xa5\\xc9\\xd9\\xde\\xc9\\xa1\\x8d\\xf0\\xff\\xe9'
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49
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50 More condensed:
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51
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52 >>> hashlib.sha224("Nobody inspects the spammish repetition").hexdigest()
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53 'a4337bc45a8fc544c03f52dc550cd6e1e87021bc896588bd79e901e2'
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54
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55 """
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56
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57
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58 def __get_builtin_constructor(name):
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59 if name in ('SHA1', 'sha1'):
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60 import _sha
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61 return _sha.new
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62 elif name in ('MD5', 'md5'):
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63 import _md5
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64 return _md5.new
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65 elif name in ('SHA256', 'sha256', 'SHA224', 'sha224'):
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66 import _sha256
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67 bs = name[3:]
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68 if bs == '256':
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69 return _sha256.sha256
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70 elif bs == '224':
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71 return _sha256.sha224
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72 elif name in ('SHA512', 'sha512', 'SHA384', 'sha384'):
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73 import _sha512
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74 bs = name[3:]
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75 if bs == '512':
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76 return _sha512.sha512
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77 elif bs == '384':
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78 return _sha512.sha384
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79
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80 raise ValueError, "unsupported hash type"
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81
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82
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83 def __py_new(name, string=''):
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84 """new(name, string='') - Return a new hashing object using the named algorithm;
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85 optionally initialized with a string.
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86 """
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87 return __get_builtin_constructor(name)(string)
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88
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89
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90 def __hash_new(name, string=''):
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91 """new(name, string='') - Return a new hashing object using the named algorithm;
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92 optionally initialized with a string.
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93 """
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94 try:
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95 return _hashlib.new(name, string)
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96 except ValueError:
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97 # If the _hashlib module (OpenSSL) doesn't support the named
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98 # hash, try using our builtin implementations.
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99 # This allows for SHA224/256 and SHA384/512 support even though
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100 # the OpenSSL library prior to 0.9.8 doesn't provide them.
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101 return __get_builtin_constructor(name)(string)
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102
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103
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104 try:
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105 import _hashlib
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106 # use the wrapper of the C implementation
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107 new = __hash_new
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108
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109 for opensslFuncName in filter(lambda n: n.startswith('openssl_'), dir(_hashlib)):
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110 funcName = opensslFuncName[len('openssl_'):]
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111 try:
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112 # try them all, some may not work due to the OpenSSL
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113 # version not supporting that algorithm.
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114 f = getattr(_hashlib, opensslFuncName)
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115 f()
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116 # Use the C function directly (very fast)
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117 exec funcName + ' = f'
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118 except ValueError:
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119 try:
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120 # Use the builtin implementation directly (fast)
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121 exec funcName + ' = __get_builtin_constructor(funcName)'
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122 except ValueError:
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123 # this one has no builtin implementation, don't define it
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124 pass
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125 # clean up our locals
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126 del f
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127 del opensslFuncName
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128 del funcName
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129
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130 except ImportError:
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131 # We don't have the _hashlib OpenSSL module?
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132 # use the built in legacy interfaces via a wrapper function
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133 new = __py_new
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134
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135 # lookup the C function to use directly for the named constructors
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136 md5 = __get_builtin_constructor('md5')
624918e1c1b2 [ sf.net patch # 1121611 ]
Gregory P. Smith <greg@mad-scientist.com>
parents:
diff changeset
137 sha1 = __get_builtin_constructor('sha1')
624918e1c1b2 [ sf.net patch # 1121611 ]
Gregory P. Smith <greg@mad-scientist.com>
parents:
diff changeset
138 sha224 = __get_builtin_constructor('sha224')
624918e1c1b2 [ sf.net patch # 1121611 ]
Gregory P. Smith <greg@mad-scientist.com>
parents:
diff changeset
139 sha256 = __get_builtin_constructor('sha256')
624918e1c1b2 [ sf.net patch # 1121611 ]
Gregory P. Smith <greg@mad-scientist.com>
parents:
diff changeset
140 sha384 = __get_builtin_constructor('sha384')
624918e1c1b2 [ sf.net patch # 1121611 ]
Gregory P. Smith <greg@mad-scientist.com>
parents:
diff changeset
141 sha512 = __get_builtin_constructor('sha512')