Mercurial > cpython-lru_cache-weakref

annotate Lib/hmac.py @ 79691:05c8928362ee

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Merge __next__ method link fixes with 3.3.
author Ezio Melotti <ezio.melotti@gmail.com>
date Fri, 12 Oct 2012 13:46:37 +0300
parents b0605b34b2de
children 97834382c6cc
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
19862
36ca16dc35b9 HMAC algorithm as described by RFC 2104, by Gerhard Häring (SF patch
Guido van Rossum <guido@python.org>
parents:
diff changeset
1 """HMAC (Keyed-Hashing for Message Authentication) Python module.
36ca16dc35b9 HMAC algorithm as described by RFC 2104, by Gerhard Häring (SF patch
Guido van Rossum <guido@python.org>
parents:
diff changeset
2
36ca16dc35b9 HMAC algorithm as described by RFC 2104, by Gerhard Häring (SF patch
Guido van Rossum <guido@python.org>
parents:
diff changeset
3 Implements the HMAC algorithm as described by RFC 2104.
36ca16dc35b9 HMAC algorithm as described by RFC 2104, by Gerhard Häring (SF patch
Guido van Rossum <guido@python.org>
parents:
diff changeset
4 """
36ca16dc35b9 HMAC algorithm as described by RFC 2104, by Gerhard Häring (SF patch
Guido van Rossum <guido@python.org>
parents:
diff changeset
5
43776
b310fd2b0184 Merged revisions 58862-58885 via svnmerge from
Guido van Rossum <guido@python.org>
parents: 42902
diff changeset
6 import warnings as _warnings
77702
c82451eeb595 Issue #15061: Re-implemented hmac.compare_digest() in C
Christian Heimes <christian@cheimes.de>
parents: 77436
diff changeset
7 from operator import _compare_digest as compare_digest
43776
b310fd2b0184 Merged revisions 58862-58885 via svnmerge from
Guido van Rossum <guido@python.org>
parents: 42902
diff changeset
8
42179
f4a1b76a5a63 Make hmac use bytes. Make test_hmac pass.
Guido van Rossum <guido@python.org>
parents: 41824
diff changeset
9 trans_5C = bytes((x ^ 0x5C) for x in range(256))
f4a1b76a5a63 Make hmac use bytes. Make test_hmac pass.
Guido van Rossum <guido@python.org>
parents: 41824
diff changeset
10 trans_36 = bytes((x ^ 0x36) for x in range(256))
19953
0f9df563b65d Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 19862
diff changeset
11
20847
ec632a41ee35 [Patch #477336] Make hmac.py match PEP247, and fix the copy method() so that
Andrew M. Kuchling <amk@amk.ca>
parents: 19953
diff changeset
12 # The size of the digests returned by HMAC depends on the underlying
40582
67287ca4e1e8 Merged revisions 53005-53303 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 35375
diff changeset
13 # hashing module used. Use digest_size from the instance of HMAC instead.
20847
ec632a41ee35 [Patch #477336] Make hmac.py match PEP247, and fix the copy method() so that
Andrew M. Kuchling <amk@amk.ca>
parents: 19953
diff changeset
14 digest_size = None
ec632a41ee35 [Patch #477336] Make hmac.py match PEP247, and fix the copy method() so that
Andrew M. Kuchling <amk@amk.ca>
parents: 19953
diff changeset
15
31704
490eb64bc5c9 Speed HMAC.copy() by installing a secret backdoor argument to
Tim Peters <tim.peters@gmail.com>
parents: 23645
diff changeset
16
76906
ddcc8ee680d7 Issue #14532: Add a secure_compare() helper to the hmac module, to mitigate
Charles-François Natali <neologix@free.fr>
parents: 73165
diff changeset
17
19862
36ca16dc35b9 HMAC algorithm as described by RFC 2104, by Gerhard Häring (SF patch
Guido van Rossum <guido@python.org>
parents:
diff changeset
18 class HMAC:
43776
b310fd2b0184 Merged revisions 58862-58885 via svnmerge from
Guido van Rossum <guido@python.org>
parents: 42902
diff changeset
19 """RFC 2104 HMAC class. Also complies with RFC 4231.
19862
36ca16dc35b9 HMAC algorithm as described by RFC 2104, by Gerhard Häring (SF patch
Guido van Rossum <guido@python.org>
parents:
diff changeset
20
20847
ec632a41ee35 [Patch #477336] Make hmac.py match PEP247, and fix the copy method() so that
Andrew M. Kuchling <amk@amk.ca>
parents: 19953
diff changeset
21 This supports the API for Cryptographic Hash Functions (PEP 247).
19953
0f9df563b65d Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 19862
diff changeset
22 """
40582
67287ca4e1e8 Merged revisions 53005-53303 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 35375
diff changeset
23 blocksize = 64 # 512-bit HMAC; can be changed in subclasses.
19862
36ca16dc35b9 HMAC algorithm as described by RFC 2104, by Gerhard Häring (SF patch
Guido van Rossum <guido@python.org>
parents:
diff changeset
24
36ca16dc35b9 HMAC algorithm as described by RFC 2104, by Gerhard Häring (SF patch
Guido van Rossum <guido@python.org>
parents:
diff changeset
25 def __init__(self, key, msg = None, digestmod = None):
36ca16dc35b9 HMAC algorithm as described by RFC 2104, by Gerhard Häring (SF patch
Guido van Rossum <guido@python.org>
parents:
diff changeset
26 """Create a new HMAC object.
36ca16dc35b9 HMAC algorithm as described by RFC 2104, by Gerhard Häring (SF patch
Guido van Rossum <guido@python.org>
parents:
diff changeset
27
36ca16dc35b9 HMAC algorithm as described by RFC 2104, by Gerhard Häring (SF patch
Guido van Rossum <guido@python.org>
parents:
diff changeset
28 key: key for the keyed hash object.
36ca16dc35b9 HMAC algorithm as described by RFC 2104, by Gerhard Häring (SF patch
Guido van Rossum <guido@python.org>
parents:
diff changeset
29 msg: Initial input for the hash, if provided.
35375
624918e1c1b2 [ sf.net patch # 1121611 ]
Gregory P. Smith <greg@mad-scientist.com>
parents: 31704
diff changeset
30 digestmod: A module supporting PEP 247. *OR*
624918e1c1b2 [ sf.net patch # 1121611 ]
Gregory P. Smith <greg@mad-scientist.com>
parents: 31704
diff changeset
31 A hashlib constructor returning a new hash object.
624918e1c1b2 [ sf.net patch # 1121611 ]
Gregory P. Smith <greg@mad-scientist.com>
parents: 31704
diff changeset
32 Defaults to hashlib.md5.
42179
f4a1b76a5a63 Make hmac use bytes. Make test_hmac pass.
Guido van Rossum <guido@python.org>
parents: 41824
diff changeset
33
f4a1b76a5a63 Make hmac use bytes. Make test_hmac pass.
Guido van Rossum <guido@python.org>
parents: 41824
diff changeset
34 Note: key and msg must be bytes objects.
19862
36ca16dc35b9 HMAC algorithm as described by RFC 2104, by Gerhard Häring (SF patch
Guido van Rossum <guido@python.org>
parents:
diff changeset
35 """
31704
490eb64bc5c9 Speed HMAC.copy() by installing a secret backdoor argument to
Tim Peters <tim.peters@gmail.com>
parents: 23645
diff changeset
36
45627
24f4230baebe Fixed failing unit tests due to str/bytes mismatch.
Alexandre Vassalotti <alexandre@peadrop.com>
parents: 43776
diff changeset
37 if not isinstance(key, bytes):
77871
b0605b34b2de Issue #15225: improve error message when hmac is passed a wrong key type.
Antoine Pitrou <solipsis@pitrou.net>
parents: 77702
diff changeset
38 raise TypeError("key: expected bytes, but got %r" % type(key).__name__)
42179
f4a1b76a5a63 Make hmac use bytes. Make test_hmac pass.
Guido van Rossum <guido@python.org>
parents: 41824
diff changeset
39
23594
c3a67ce58245 Replace '== None' with 'is None'
Raymond Hettinger <python@rcn.com>
parents: 20967
diff changeset
40 if digestmod is None:
35375
624918e1c1b2 [ sf.net patch # 1121611 ]
Gregory P. Smith <greg@mad-scientist.com>
parents: 31704
diff changeset
41 import hashlib
624918e1c1b2 [ sf.net patch # 1121611 ]
Gregory P. Smith <greg@mad-scientist.com>
parents: 31704
diff changeset
42 digestmod = hashlib.md5
19862
36ca16dc35b9 HMAC algorithm as described by RFC 2104, by Gerhard Häring (SF patch
Guido van Rossum <guido@python.org>
parents:
diff changeset
43
73165
8e57b5d8f58f Closes #13258: Use callable() built-in in the standard library.
Florent Xicluna <florent.xicluna@gmail.com>
parents: 64197
diff changeset
44 if callable(digestmod):
35375
624918e1c1b2 [ sf.net patch # 1121611 ]
Gregory P. Smith <greg@mad-scientist.com>
parents: 31704
diff changeset
45 self.digest_cons = digestmod
624918e1c1b2 [ sf.net patch # 1121611 ]
Gregory P. Smith <greg@mad-scientist.com>
parents: 31704
diff changeset
46 else:
42179
f4a1b76a5a63 Make hmac use bytes. Make test_hmac pass.
Guido van Rossum <guido@python.org>
parents: 41824
diff changeset
47 self.digest_cons = lambda d=b'': digestmod.new(d)
35375
624918e1c1b2 [ sf.net patch # 1121611 ]
Gregory P. Smith <greg@mad-scientist.com>
parents: 31704
diff changeset
48
624918e1c1b2 [ sf.net patch # 1121611 ]
Gregory P. Smith <greg@mad-scientist.com>
parents: 31704
diff changeset
49 self.outer = self.digest_cons()
624918e1c1b2 [ sf.net patch # 1121611 ]
Gregory P. Smith <greg@mad-scientist.com>
parents: 31704
diff changeset
50 self.inner = self.digest_cons()
624918e1c1b2 [ sf.net patch # 1121611 ]
Gregory P. Smith <greg@mad-scientist.com>
parents: 31704
diff changeset
51 self.digest_size = self.inner.digest_size
20967
bb8716095a81 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 20847
diff changeset
52
43776
b310fd2b0184 Merged revisions 58862-58885 via svnmerge from
Guido van Rossum <guido@python.org>
parents: 42902
diff changeset
53 if hasattr(self.inner, 'block_size'):
b310fd2b0184 Merged revisions 58862-58885 via svnmerge from
Guido van Rossum <guido@python.org>
parents: 42902
diff changeset
54 blocksize = self.inner.block_size
b310fd2b0184 Merged revisions 58862-58885 via svnmerge from
Guido van Rossum <guido@python.org>
parents: 42902
diff changeset
55 if blocksize < 16:
b310fd2b0184 Merged revisions 58862-58885 via svnmerge from
Guido van Rossum <guido@python.org>
parents: 42902
diff changeset
56 _warnings.warn('block_size of %d seems too small; using our '
b310fd2b0184 Merged revisions 58862-58885 via svnmerge from
Guido van Rossum <guido@python.org>
parents: 42902
diff changeset
57 'default of %d.' % (blocksize, self.blocksize),
b310fd2b0184 Merged revisions 58862-58885 via svnmerge from
Guido van Rossum <guido@python.org>
parents: 42902
diff changeset
58 RuntimeWarning, 2)
b310fd2b0184 Merged revisions 58862-58885 via svnmerge from
Guido van Rossum <guido@python.org>
parents: 42902
diff changeset
59 blocksize = self.blocksize
b310fd2b0184 Merged revisions 58862-58885 via svnmerge from
Guido van Rossum <guido@python.org>
parents: 42902
diff changeset
60 else:
b310fd2b0184 Merged revisions 58862-58885 via svnmerge from
Guido van Rossum <guido@python.org>
parents: 42902
diff changeset
61 _warnings.warn('No block_size attribute on given digest object; '
b310fd2b0184 Merged revisions 58862-58885 via svnmerge from
Guido van Rossum <guido@python.org>
parents: 42902
diff changeset
62 'Assuming %d.' % (self.blocksize),
b310fd2b0184 Merged revisions 58862-58885 via svnmerge from
Guido van Rossum <guido@python.org>
parents: 42902
diff changeset
63 RuntimeWarning, 2)
b310fd2b0184 Merged revisions 58862-58885 via svnmerge from
Guido van Rossum <guido@python.org>
parents: 42902
diff changeset
64 blocksize = self.blocksize
b310fd2b0184 Merged revisions 58862-58885 via svnmerge from
Guido van Rossum <guido@python.org>
parents: 42902
diff changeset
65
19862
36ca16dc35b9 HMAC algorithm as described by RFC 2104, by Gerhard Häring (SF patch
Guido van Rossum <guido@python.org>
parents:
diff changeset
66 if len(key) > blocksize:
35375
624918e1c1b2 [ sf.net patch # 1121611 ]
Gregory P. Smith <greg@mad-scientist.com>
parents: 31704
diff changeset
67 key = self.digest_cons(key).digest()
19862
36ca16dc35b9 HMAC algorithm as described by RFC 2104, by Gerhard Häring (SF patch
Guido van Rossum <guido@python.org>
parents:
diff changeset
68
42179
f4a1b76a5a63 Make hmac use bytes. Make test_hmac pass.
Guido van Rossum <guido@python.org>
parents: 41824
diff changeset
69 key = key + bytes(blocksize - len(key))
40582
67287ca4e1e8 Merged revisions 53005-53303 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 35375
diff changeset
70 self.outer.update(key.translate(trans_5C))
67287ca4e1e8 Merged revisions 53005-53303 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 35375
diff changeset
71 self.inner.update(key.translate(trans_36))
23612
3caee2958387 Replace boolean test with is None
Raymond Hettinger <python@rcn.com>
parents: 23594
diff changeset
72 if msg is not None:
19862
36ca16dc35b9 HMAC algorithm as described by RFC 2104, by Gerhard Häring (SF patch
Guido van Rossum <guido@python.org>
parents:
diff changeset
73 self.update(msg)
36ca16dc35b9 HMAC algorithm as described by RFC 2104, by Gerhard Häring (SF patch
Guido van Rossum <guido@python.org>
parents:
diff changeset
74
36ca16dc35b9 HMAC algorithm as described by RFC 2104, by Gerhard Häring (SF patch
Guido van Rossum <guido@python.org>
parents:
diff changeset
75 def update(self, msg):
36ca16dc35b9 HMAC algorithm as described by RFC 2104, by Gerhard Häring (SF patch
Guido van Rossum <guido@python.org>
parents:
diff changeset
76 """Update this hashing object with the string msg.
36ca16dc35b9 HMAC algorithm as described by RFC 2104, by Gerhard Häring (SF patch
Guido van Rossum <guido@python.org>
parents:
diff changeset
77 """
45627
24f4230baebe Fixed failing unit tests due to str/bytes mismatch.
Alexandre Vassalotti <alexandre@peadrop.com>
parents: 43776
diff changeset
78 if not isinstance(msg, bytes):
24f4230baebe Fixed failing unit tests due to str/bytes mismatch.
Alexandre Vassalotti <alexandre@peadrop.com>
parents: 43776
diff changeset
79 raise TypeError("expected bytes, but got %r" % type(msg).__name__)
19862
36ca16dc35b9 HMAC algorithm as described by RFC 2104, by Gerhard Häring (SF patch
Guido van Rossum <guido@python.org>
parents:
diff changeset
80 self.inner.update(msg)
36ca16dc35b9 HMAC algorithm as described by RFC 2104, by Gerhard Häring (SF patch
Guido van Rossum <guido@python.org>
parents:
diff changeset
81
36ca16dc35b9 HMAC algorithm as described by RFC 2104, by Gerhard Häring (SF patch
Guido van Rossum <guido@python.org>
parents:
diff changeset
82 def copy(self):
36ca16dc35b9 HMAC algorithm as described by RFC 2104, by Gerhard Häring (SF patch
Guido van Rossum <guido@python.org>
parents:
diff changeset
83 """Return a separate copy of this hashing object.
36ca16dc35b9 HMAC algorithm as described by RFC 2104, by Gerhard Häring (SF patch
Guido van Rossum <guido@python.org>
parents:
diff changeset
84
36ca16dc35b9 HMAC algorithm as described by RFC 2104, by Gerhard Häring (SF patch
Guido van Rossum <guido@python.org>
parents:
diff changeset
85 An update to this copy won't affect the original object.
36ca16dc35b9 HMAC algorithm as described by RFC 2104, by Gerhard Häring (SF patch
Guido van Rossum <guido@python.org>
parents:
diff changeset
86 """
64197
8397f2e007eb speed hack can be implemented more cleanly by directly calling __new__
Benjamin Peterson <benjamin@python.org>
parents: 64196
diff changeset
87 # Call __new__ directly to avoid the expensive __init__.
8397f2e007eb speed hack can be implemented more cleanly by directly calling __new__
Benjamin Peterson <benjamin@python.org>
parents: 64196
diff changeset
88 other = self.__class__.__new__(self.__class__)
35375
624918e1c1b2 [ sf.net patch # 1121611 ]
Gregory P. Smith <greg@mad-scientist.com>
parents: 31704
diff changeset
89 other.digest_cons = self.digest_cons
31704
490eb64bc5c9 Speed HMAC.copy() by installing a secret backdoor argument to
Tim Peters <tim.peters@gmail.com>
parents: 23645
diff changeset
90 other.digest_size = self.digest_size
20847
ec632a41ee35 [Patch #477336] Make hmac.py match PEP247, and fix the copy method() so that
Andrew M. Kuchling <amk@amk.ca>
parents: 19953
diff changeset
91 other.inner = self.inner.copy()
ec632a41ee35 [Patch #477336] Make hmac.py match PEP247, and fix the copy method() so that
Andrew M. Kuchling <amk@amk.ca>
parents: 19953
diff changeset
92 other.outer = self.outer.copy()
ec632a41ee35 [Patch #477336] Make hmac.py match PEP247, and fix the copy method() so that
Andrew M. Kuchling <amk@amk.ca>
parents: 19953
diff changeset
93 return other
19862
36ca16dc35b9 HMAC algorithm as described by RFC 2104, by Gerhard Häring (SF patch
Guido van Rossum <guido@python.org>
parents:
diff changeset
94
40582
67287ca4e1e8 Merged revisions 53005-53303 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 35375
diff changeset
95 def _current(self):
67287ca4e1e8 Merged revisions 53005-53303 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 35375
diff changeset
96 """Return a hash object for the current state.
67287ca4e1e8 Merged revisions 53005-53303 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 35375
diff changeset
97
67287ca4e1e8 Merged revisions 53005-53303 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 35375
diff changeset
98 To be used only internally with digest() and hexdigest().
67287ca4e1e8 Merged revisions 53005-53303 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 35375
diff changeset
99 """
67287ca4e1e8 Merged revisions 53005-53303 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 35375
diff changeset
100 h = self.outer.copy()
67287ca4e1e8 Merged revisions 53005-53303 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 35375
diff changeset
101 h.update(self.inner.digest())
67287ca4e1e8 Merged revisions 53005-53303 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 35375
diff changeset
102 return h
67287ca4e1e8 Merged revisions 53005-53303 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 35375
diff changeset
103
19862
36ca16dc35b9 HMAC algorithm as described by RFC 2104, by Gerhard Häring (SF patch
Guido van Rossum <guido@python.org>
parents:
diff changeset
104 def digest(self):
36ca16dc35b9 HMAC algorithm as described by RFC 2104, by Gerhard Häring (SF patch
Guido van Rossum <guido@python.org>
parents:
diff changeset
105 """Return the hash value of this hashing object.
36ca16dc35b9 HMAC algorithm as described by RFC 2104, by Gerhard Häring (SF patch
Guido van Rossum <guido@python.org>
parents:
diff changeset
106
36ca16dc35b9 HMAC algorithm as described by RFC 2104, by Gerhard Häring (SF patch
Guido van Rossum <guido@python.org>
parents:
diff changeset
107 This returns a string containing 8-bit data. The object is
36ca16dc35b9 HMAC algorithm as described by RFC 2104, by Gerhard Häring (SF patch
Guido van Rossum <guido@python.org>
parents:
diff changeset
108 not altered in any way by this function; you can continue
36ca16dc35b9 HMAC algorithm as described by RFC 2104, by Gerhard Häring (SF patch
Guido van Rossum <guido@python.org>
parents:
diff changeset
109 updating the object after calling this function.
36ca16dc35b9 HMAC algorithm as described by RFC 2104, by Gerhard Häring (SF patch
Guido van Rossum <guido@python.org>
parents:
diff changeset
110 """
40582
67287ca4e1e8 Merged revisions 53005-53303 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 35375
diff changeset
111 h = self._current()
19862
36ca16dc35b9 HMAC algorithm as described by RFC 2104, by Gerhard Häring (SF patch
Guido van Rossum <guido@python.org>
parents:
diff changeset
112 return h.digest()
36ca16dc35b9 HMAC algorithm as described by RFC 2104, by Gerhard Häring (SF patch
Guido van Rossum <guido@python.org>
parents:
diff changeset
113
36ca16dc35b9 HMAC algorithm as described by RFC 2104, by Gerhard Häring (SF patch
Guido van Rossum <guido@python.org>
parents:
diff changeset
114 def hexdigest(self):
36ca16dc35b9 HMAC algorithm as described by RFC 2104, by Gerhard Häring (SF patch
Guido van Rossum <guido@python.org>
parents:
diff changeset
115 """Like digest(), but returns a string of hexadecimal digits instead.
36ca16dc35b9 HMAC algorithm as described by RFC 2104, by Gerhard Häring (SF patch
Guido van Rossum <guido@python.org>
parents:
diff changeset
116 """
40582
67287ca4e1e8 Merged revisions 53005-53303 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 35375
diff changeset
117 h = self._current()
67287ca4e1e8 Merged revisions 53005-53303 via svnmerge from
Thomas Wouters <thomas@python.org>
parents: 35375
diff changeset
118 return h.hexdigest()
19862
36ca16dc35b9 HMAC algorithm as described by RFC 2104, by Gerhard Häring (SF patch
Guido van Rossum <guido@python.org>
parents:
diff changeset
119
36ca16dc35b9 HMAC algorithm as described by RFC 2104, by Gerhard Häring (SF patch
Guido van Rossum <guido@python.org>
parents:
diff changeset
120 def new(key, msg = None, digestmod = None):
36ca16dc35b9 HMAC algorithm as described by RFC 2104, by Gerhard Häring (SF patch
Guido van Rossum <guido@python.org>
parents:
diff changeset
121 """Create a new hashing object and return it.
36ca16dc35b9 HMAC algorithm as described by RFC 2104, by Gerhard Häring (SF patch
Guido van Rossum <guido@python.org>
parents:
diff changeset
122
36ca16dc35b9 HMAC algorithm as described by RFC 2104, by Gerhard Häring (SF patch
Guido van Rossum <guido@python.org>
parents:
diff changeset
123 key: The starting key for the hash.
36ca16dc35b9 HMAC algorithm as described by RFC 2104, by Gerhard Häring (SF patch
Guido van Rossum <guido@python.org>
parents:
diff changeset
124 msg: if available, will immediately be hashed into the object's starting
19953
0f9df563b65d Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 19862
diff changeset
125 state.
19862
36ca16dc35b9 HMAC algorithm as described by RFC 2104, by Gerhard Häring (SF patch
Guido van Rossum <guido@python.org>
parents:
diff changeset
126
36ca16dc35b9 HMAC algorithm as described by RFC 2104, by Gerhard Häring (SF patch
Guido van Rossum <guido@python.org>
parents:
diff changeset
127 You can now feed arbitrary strings into the object using its update()
36ca16dc35b9 HMAC algorithm as described by RFC 2104, by Gerhard Häring (SF patch
Guido van Rossum <guido@python.org>
parents:
diff changeset
128 method, and can ask for the hash value at any time by calling its digest()
36ca16dc35b9 HMAC algorithm as described by RFC 2104, by Gerhard Häring (SF patch
Guido van Rossum <guido@python.org>
parents:
diff changeset
129 method.
36ca16dc35b9 HMAC algorithm as described by RFC 2104, by Gerhard Häring (SF patch
Guido van Rossum <guido@python.org>
parents:
diff changeset
130 """
36ca16dc35b9 HMAC algorithm as described by RFC 2104, by Gerhard Häring (SF patch
Guido van Rossum <guido@python.org>
parents:
diff changeset
131 return HMAC(key, msg, digestmod)