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annotate Lib/hashlib.py @ 51749:1408feec0084 3.0

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Merged revisions 69798 via svnmerge from svn+ssh://pythondev@svn.python.org/python/branches/py3k ................ r69798 | benjamin.peterson | 2009-02-19 22:02:38 -0600 (Thu, 19 Feb 2009) | 13 lines Merged revisions 69769,69776 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r69769 | georg.brandl | 2009-02-19 02:30:06 -0600 (Thu, 19 Feb 2009) | 1 line #5310, #3558: fix operator precedence table. ........ r69776 | georg.brandl | 2009-02-19 10:34:51 -0600 (Thu, 19 Feb 2009) | 2 lines #5317: update IronPython URL. ........ ................
author Benjamin Peterson <benjamin@python.org>
date Fri, 20 Feb 2009 04:05:32 +0000
parents 7e194b9cc0a2
children da21b480ff05
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) 2005-2007 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, data=b'') - 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 binary data.
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12
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13 Named constructor functions are also available, these are faster
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14 than using new(name):
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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 bytes in 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 bytes passed to the update() method
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32 so far.
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33 - hexdigest(): Like digest() except the digest is returned as a unicode
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34 object of double length, containing only hexadecimal digits.
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35 - copy(): Return a copy (clone) of the hash object. This can be used to
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36 efficiently compute the digests of strings that share a common
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37 initial substring.
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38
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39 For example, to obtain the digest of the string 'Nobody inspects the
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40 spammish repetition':
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41
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42 >>> import hashlib
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43 >>> m = hashlib.md5()
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44 >>> m.update(b"Nobody inspects")
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45 >>> m.update(b" the spammish repetition")
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46 >>> m.digest()
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47 b'\\xbbd\\x9c\\x83\\xdd\\x1e\\xa5\\xc9\\xd9\\xde\\xc9\\xa1\\x8d\\xf0\\xff\\xe9'
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48
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49 More condensed:
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50
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51 >>> hashlib.sha224(b"Nobody inspects the spammish repetition").hexdigest()
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52 'a4337bc45a8fc544c03f52dc550cd6e1e87021bc896588bd79e901e2'
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53
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54 """
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55
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56
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57 def __get_builtin_constructor(name):
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58 if name in ('SHA1', 'sha1'):
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59 import _sha1
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60 return _sha1.sha1
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61 elif name in ('MD5', 'md5'):
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62 import _md5
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63 return _md5.md5
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64 elif name in ('SHA256', 'sha256', 'SHA224', 'sha224'):
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65 import _sha256
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66 bs = name[3:]
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67 if bs == '256':
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68 return _sha256.sha256
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69 elif bs == '224':
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70 return _sha256.sha224
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71 elif name in ('SHA512', 'sha512', 'SHA384', 'sha384'):
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72 import _sha512
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73 bs = name[3:]
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74 if bs == '512':
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75 return _sha512.sha512
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76 elif bs == '384':
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77 return _sha512.sha384
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78
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79 raise ValueError("unsupported hash type")
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80
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81
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82 def __py_new(name, data=b''):
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83 """new(name, data=b'') - Return a new hashing object using the named algorithm;
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84 optionally initialized with data (which must be bytes).
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85 """
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86 return __get_builtin_constructor(name)(data)
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87
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88
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89 def __hash_new(name, data=b''):
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90 """new(name, data=b'') - Return a new hashing object using the named algorithm;
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91 optionally initialized with data (which must be bytes).
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92 """
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93 try:
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94 return _hashlib.new(name, data)
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95 except ValueError:
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96 # If the _hashlib module (OpenSSL) doesn't support the named
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97 # hash, try using our builtin implementations.
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98 # This allows for SHA224/256 and SHA384/512 support even though
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99 # the OpenSSL library prior to 0.9.8 doesn't provide them.
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100 return __get_builtin_constructor(name)(data)
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101
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102
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103 try:
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104 import _hashlib
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105 # use the wrapper of the C implementation
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106 new = __hash_new
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107
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108 for opensslFuncName in filter(lambda n: n.startswith('openssl_'), dir(_hashlib)):
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109 funcName = opensslFuncName[len('openssl_'):]
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110 try:
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111 # try them all, some may not work due to the OpenSSL
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112 # version not supporting that algorithm.
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113 f = getattr(_hashlib, opensslFuncName)
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114 f()
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115 # Use the C function directly (very fast)
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116 exec(funcName + ' = f')
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117 except ValueError:
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118 try:
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119 # Use the builtin implementation directly (fast)
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120 exec(funcName + ' = __get_builtin_constructor(funcName)')
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121 except ValueError:
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122 # this one has no builtin implementation, don't define it
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123 pass
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124 # clean up our locals
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125 del f
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126 del opensslFuncName
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127 del funcName
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128
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129 except ImportError:
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130 # We don't have the _hashlib OpenSSL module?
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131 # use the built in legacy interfaces via a wrapper function
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132 new = __py_new
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133
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134 # lookup the C function to use directly for the named constructors
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135 md5 = __get_builtin_constructor('md5')
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136 sha1 = __get_builtin_constructor('sha1')
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137 sha224 = __get_builtin_constructor('sha224')
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138 sha256 = __get_builtin_constructor('sha256')
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139 sha384 = __get_builtin_constructor('sha384')
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140 sha512 = __get_builtin_constructor('sha512')