98 lines
2.9 KiB
Python
98 lines
2.9 KiB
Python
# -*- coding: utf-8 -*-
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#
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# ===================================================================
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# The contents of this file are dedicated to the public domain. To
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# the extent that dedication to the public domain is not available,
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# everyone is granted a worldwide, perpetual, royalty-free,
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# non-exclusive license to exercise all rights associated with the
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# contents of this file for any purpose whatsoever.
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# No rights are reserved.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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# SOFTWARE.
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# ===================================================================
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"""MD5 cryptographic hash algorithm.
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MD5 is specified in RFC1321_ and produces the 128 bit digest of a message.
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>>> from Crypto.Hash import MD5
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>>>
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>>> h = MD5.new()
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>>> h.update(b'Hello')
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>>> print h.hexdigest()
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MD5 stand for Message Digest version 5, and it was invented by Rivest in 1991.
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This algorithm is insecure. Do not use it for new designs.
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.. _RFC1321: http://tools.ietf.org/html/rfc1321
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"""
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_revision__ = "$Id$"
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__all__ = ['new', 'digest_size', 'MD5Hash' ]
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from Crypto.Util.py3compat import *
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from Crypto.Hash.hashalgo import HashAlgo
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try:
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# The md5 module is deprecated in Python 2.6, so use hashlib when possible.
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import hashlib
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hashFactory = hashlib.md5
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except ImportError:
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from . import md5
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hashFactory = md5
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class MD5Hash(HashAlgo):
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"""Class that implements an MD5 hash
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:undocumented: block_size
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"""
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#: ASN.1 Object identifier (OID)::
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#:
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#: id-md5 OBJECT IDENTIFIER ::= {
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#: iso(1) member-body(2) us(840) rsadsi(113549)
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#: digestAlgorithm(2) 5
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#: }
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#:
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#: This value uniquely identifies the MD5 algorithm.
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oid = b('\x06\x08\x2a\x86\x48\x86\xf7\x0d\x02\x05')
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digest_size = 16
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block_size = 64
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def __init__(self, data=None):
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HashAlgo.__init__(self, hashFactory, data)
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def new(self, data=None):
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return MD5Hash(data)
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def new(data=None):
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"""Return a fresh instance of the hash object.
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:Parameters:
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data : byte string
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The very first chunk of the message to hash.
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It is equivalent to an early call to `MD5Hash.update()`.
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Optional.
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:Return: A `MD5Hash` object
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"""
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return MD5Hash().new(data)
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#: The size of the resulting hash in bytes.
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digest_size = MD5Hash.digest_size
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#: The internal block size of the hash algorithm in bytes.
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block_size = MD5Hash.block_size
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