Mercurial > cpython-lru_cache-weakref

annotate Lib/hmac.py @ 78069:a8aa77458e12 3.2

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Add c_size_t and c_ssize_t to the ctypes summary table.
author Antoine Pitrou <solipsis@pitrou.net>
date Thu, 12 Jul 2012 20:31:50 +0200
parents 8e57b5d8f58f
children ddcc8ee680d7
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19862
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1 """HMAC (Keyed-Hashing for Message Authentication) Python module.
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2
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3 Implements the HMAC algorithm as described by RFC 2104.
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4 """
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5
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6 import warnings as _warnings
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7
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8 trans_5C = bytes((x ^ 0x5C) for x in range(256))
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9 trans_36 = bytes((x ^ 0x36) for x in range(256))
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10
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11 # The size of the digests returned by HMAC depends on the underlying
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12 # hashing module used. Use digest_size from the instance of HMAC instead.
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13 digest_size = None
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14
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16 class HMAC:
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17 """RFC 2104 HMAC class. Also complies with RFC 4231.
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19 This supports the API for Cryptographic Hash Functions (PEP 247).
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20 """
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21 blocksize = 64 # 512-bit HMAC; can be changed in subclasses.
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22
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23 def __init__(self, key, msg = None, digestmod = None):
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24 """Create a new HMAC object.
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25
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26 key: key for the keyed hash object.
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27 msg: Initial input for the hash, if provided.
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28 digestmod: A module supporting PEP 247. *OR*
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29 A hashlib constructor returning a new hash object.
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30 Defaults to hashlib.md5.
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31
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32 Note: key and msg must be bytes objects.
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33 """
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34
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35 if not isinstance(key, bytes):
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36 raise TypeError("expected bytes, but got %r" % type(key).__name__)
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37
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38 if digestmod is None:
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39 import hashlib
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40 digestmod = hashlib.md5
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41
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42 if callable(digestmod):
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43 self.digest_cons = digestmod
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44 else:
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45 self.digest_cons = lambda d=b'': digestmod.new(d)
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46
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47 self.outer = self.digest_cons()
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48 self.inner = self.digest_cons()
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49 self.digest_size = self.inner.digest_size
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51 if hasattr(self.inner, 'block_size'):
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52 blocksize = self.inner.block_size
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53 if blocksize < 16:
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54 _warnings.warn('block_size of %d seems too small; using our '
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55 'default of %d.' % (blocksize, self.blocksize),
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56 RuntimeWarning, 2)
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57 blocksize = self.blocksize
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58 else:
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59 _warnings.warn('No block_size attribute on given digest object; '
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60 'Assuming %d.' % (self.blocksize),
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61 RuntimeWarning, 2)
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62 blocksize = self.blocksize
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63
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64 if len(key) > blocksize:
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65 key = self.digest_cons(key).digest()
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66
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67 key = key + bytes(blocksize - len(key))
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68 self.outer.update(key.translate(trans_5C))
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69 self.inner.update(key.translate(trans_36))
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70 if msg is not None:
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71 self.update(msg)
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72
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73 def update(self, msg):
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74 """Update this hashing object with the string msg.
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75 """
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76 if not isinstance(msg, bytes):
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77 raise TypeError("expected bytes, but got %r" % type(msg).__name__)
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78 self.inner.update(msg)
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79
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80 def copy(self):
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81 """Return a separate copy of this hashing object.
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82
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83 An update to this copy won't affect the original object.
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84 """
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85 # Call __new__ directly to avoid the expensive __init__.
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86 other = self.__class__.__new__(self.__class__)
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87 other.digest_cons = self.digest_cons
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88 other.digest_size = self.digest_size
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89 other.inner = self.inner.copy()
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90 other.outer = self.outer.copy()
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91 return other
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92
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93 def _current(self):
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94 """Return a hash object for the current state.
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95
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96 To be used only internally with digest() and hexdigest().
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97 """
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98 h = self.outer.copy()
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99 h.update(self.inner.digest())
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100 return h
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101
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102 def digest(self):
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103 """Return the hash value of this hashing object.
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104
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105 This returns a string containing 8-bit data. The object is
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106 not altered in any way by this function; you can continue
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107 updating the object after calling this function.
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108 """
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109 h = self._current()
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110 return h.digest()
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111
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112 def hexdigest(self):
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113 """Like digest(), but returns a string of hexadecimal digits instead.
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114 """
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115 h = self._current()
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116 return h.hexdigest()
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117
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118 def new(key, msg = None, digestmod = None):
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119 """Create a new hashing object and return it.
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120
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121 key: The starting key for the hash.
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122 msg: if available, will immediately be hashed into the object's starting
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123 state.
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124
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125 You can now feed arbitrary strings into the object using its update()
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126 method, and can ask for the hash value at any time by calling its digest()
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127 method.
36ca16dc35b9 HMAC algorithm as described by RFC 2104, by Gerhard Häring (SF patch
Guido van Rossum <guido@python.org>
parents:
diff changeset
128 """
36ca16dc35b9 HMAC algorithm as described by RFC 2104, by Gerhard Häring (SF patch
Guido van Rossum <guido@python.org>
parents:
diff changeset
129 return HMAC(key, msg, digestmod)