author | bugtracker-ml@nttdocomo.com |
Tue, 06 Apr 2010 17:00:22 +0100 | |
changeset 56 | f24810eebc6b |
parent 1 | 2fb8b9db1c86 |
permissions | -rw-r--r-- |
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:mod:`hmac` --- Keyed-Hashing for Message Authentication |
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======================================================== |
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.. module:: hmac |
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:synopsis: Keyed-Hashing for Message Authentication (HMAC) implementation for Python. |
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.. moduleauthor:: Gerhard Häring <ghaering@users.sourceforge.net> |
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.. sectionauthor:: Gerhard Häring <ghaering@users.sourceforge.net> |
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.. versionadded:: 2.2 |
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This module implements the HMAC algorithm as described by :rfc:`2104`. |
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.. function:: new(key[, msg[, digestmod]]) |
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Return a new hmac object. If *msg* is present, the method call ``update(msg)`` |
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is made. *digestmod* is the digest constructor or module for the HMAC object to |
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use. It defaults to the :func:`hashlib.md5` constructor. |
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.. note:: |
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The md5 hash has known weaknesses but remains the default for backwards |
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compatibility. Choose a better one for your application. |
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An HMAC object has the following methods: |
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.. method:: hmac.update(msg) |
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Update the hmac object with the string *msg*. Repeated calls are equivalent to |
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a single call with the concatenation of all the arguments: ``m.update(a); |
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m.update(b)`` is equivalent to ``m.update(a + b)``. |
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.. method:: hmac.digest() |
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Return the digest of the strings passed to the :meth:`update` method so far. |
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This string will be the same length as the *digest_size* of the digest given to |
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the constructor. It may contain non-ASCII characters, including NUL bytes. |
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.. method:: hmac.hexdigest() |
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Like :meth:`digest` except the digest is returned as a string twice the length |
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containing only hexadecimal digits. This may be used to exchange the value |
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safely in email or other non-binary environments. |
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.. method:: hmac.copy() |
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Return a copy ("clone") of the hmac object. This can be used to efficiently |
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compute the digests of strings that share a common initial substring. |
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.. seealso:: |
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Module :mod:`hashlib` |
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The python module providing secure hash functions. |
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