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+# -*- coding: utf-8 -*-
+#
+# ===================================================================
+# The contents of this file are dedicated to the public domain.  To
+# the extent that dedication to the public domain is not available,
+# everyone is granted a worldwide, perpetual, royalty-free,
+# non-exclusive license to exercise all rights associated with the
+# contents of this file for any purpose whatsoever.
+# No rights are reserved.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+# ===================================================================
+
+"""Hashing algorithms
+
+Hash functions take arbitrary binary strings as input, and produce a random-like output
+of fixed size that is dependent on the input; it should be practically infeasible 
+to derive the original input data given only the hash function's
+output. In other words, the hash function is *one-way*.
+
+It should also not be practically feasible to find a second piece of data
+(a *second pre-image*) whose hash is the same as the original message
+(*weak collision resistance*).
+
+Finally, it should not be feasible to find two arbitrary messages with the
+same hash (*strong collision resistance*).
+
+The output of the hash function is called the *digest* of the input message.
+In general, the security of a hash function is related to the length of the
+digest. If the digest is *n* bits long, its security level is roughly comparable
+to the the one offered by an *n/2* bit encryption algorithm.
+
+Hash functions can be used simply as a integrity check, or, in
+association with a public-key algorithm, can be used to implement
+digital signatures.
+
+The hashing modules here all support the interface described in `PEP
+247`_ , "API for Cryptographic Hash Functions". 
+
+.. _`PEP 247` : http://www.python.org/dev/peps/pep-0247/
+
+:undocumented: _MD2, _MD4, _RIPEMD160, _SHA224, _SHA256, _SHA384, _SHA512
+"""
+
+__all__ = ['HMAC', 'MD2', 'MD4', 'MD5', 'RIPEMD', 'SHA',
+           'SHA224', 'SHA256', 'SHA384', 'SHA512']
+__revision__ = "$Id$"
+
+