Mercurial > cpython-lru_cache-weakref

annotate Lib/hashlib.py @ 58765:2ba7677bfa95 legacy-trunk

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testCopysign was defined twice in test_math; combine the definitions
author Mark Dickinson <dickinsm@gmail.com>
date Sat, 06 Feb 2010 23:11:25 +0000
parents 746f10e0624e
children e1b70c6df9e7
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 # This tuple and __get_builtin_constructor() must be modified if a new
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58 # always available algorithm is added.
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59 __always_supported = ('md5', 'sha1', 'sha224', 'sha256', 'sha384', 'sha512')
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60
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61 __all__ = __always_supported + ('new',)
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62
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63
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64 def __get_builtin_constructor(name):
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65 if name in ('SHA1', 'sha1'):
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66 import _sha
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67 return _sha.new
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68 elif name in ('MD5', 'md5'):
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69 import _md5
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70 return _md5.new
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71 elif name in ('SHA256', 'sha256', 'SHA224', 'sha224'):
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72 import _sha256
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73 bs = name[3:]
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74 if bs == '256':
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75 return _sha256.sha256
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76 elif bs == '224':
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77 return _sha256.sha224
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78 elif name in ('SHA512', 'sha512', 'SHA384', 'sha384'):
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79 import _sha512
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80 bs = name[3:]
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81 if bs == '512':
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82 return _sha512.sha512
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83 elif bs == '384':
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84 return _sha512.sha384
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85
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86 raise ValueError('unsupported hash type %s' % name)
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87
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88
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89 def __get_openssl_constructor(name):
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90 try:
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91 f = getattr(_hashlib, 'openssl_' + name)
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92 # Allow the C module to raise ValueError. The function will be
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93 # defined but the hash not actually available thanks to OpenSSL.
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94 f()
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95 # Use the C function directly (very fast)
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96 return f
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97 except (AttributeError, ValueError):
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98 return __get_builtin_constructor(name)
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99
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100
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101 def __py_new(name, string=''):
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102 """new(name, string='') - Return a new hashing object using the named algorithm;
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103 optionally initialized with a string.
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104 """
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105 return __get_builtin_constructor(name)(string)
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106
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107
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108 def __hash_new(name, string=''):
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109 """new(name, string='') - Return a new hashing object using the named algorithm;
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110 optionally initialized with a string.
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111 """
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112 try:
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113 return _hashlib.new(name, string)
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114 except ValueError:
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115 # If the _hashlib module (OpenSSL) doesn't support the named
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116 # hash, try using our builtin implementations.
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117 # This allows for SHA224/256 and SHA384/512 support even though
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118 # the OpenSSL library prior to 0.9.8 doesn't provide them.
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119 return __get_builtin_constructor(name)(string)
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120
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121
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122 try:
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123 import _hashlib
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124 new = __hash_new
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125 __get_hash = __get_openssl_constructor
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126 except ImportError:
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127 new = __py_new
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128 __get_hash = __get_builtin_constructor
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129
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130 for __func_name in __always_supported:
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131 # try them all, some may not work due to the OpenSSL
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132 # version not supporting that algorithm.
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133 try:
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134 globals()[__func_name] = __get_hash(__func_name)
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Gregory P. Smith <greg@mad-scientist.com>
parents: 48915
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135 except ValueError:
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Gregory P. Smith <greg@mad-scientist.com>
parents: 48915
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136 import logging
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137 logging.exception('code for hash %s was not found.', __func_name)
35375
624918e1c1b2 [ sf.net patch # 1121611 ]
Gregory P. Smith <greg@mad-scientist.com>
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138
55666
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Gregory P. Smith <greg@mad-scientist.com>
parents: 48915
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139 # Cleanup locals()
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Gregory P. Smith <greg@mad-scientist.com>
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140 del __always_supported, __func_name, __get_hash
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Gregory P. Smith <greg@mad-scientist.com>
parents: 48915
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141 del __py_new, __hash_new, __get_openssl_constructor