49 lines
2.2 KiB
Python
49 lines
2.2 KiB
Python
|
# -*- 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.
|
||
|
|
|
||
|
|
:undocumented: _MD2, _MD4, _RIPEMD160, _SHA224, _SHA256, _SHA384, _SHA512, _RIPEMD
|
||
|
|
"""
|
||
|
|
|
||
|
|
__all__ = ['HMAC', 'MD2', 'MD4', 'MD5', 'RIPEMD160', 'SHA1',
|
||
|
|
'SHA224', 'SHA256', 'SHA384', 'SHA512', 'CMAC']
|