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