87 lines
3 KiB
Python
87 lines
3 KiB
Python
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# -*- 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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"""SHA-1 cryptographic hash algorithm.
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SHA-1_ produces the 160 bit digest of a message.
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>>> from Crypto.Hash import SHA1
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>>>
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>>> h = SHA1.new()
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>>> h.update(b'Hello')
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>>> print h.hexdigest()
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*SHA* stands for Secure Hash Algorithm.
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This algorithm is not considered secure. Do not use it for new designs.
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.. _SHA-1: http://csrc.nist.gov/publications/fips/fips180-2/fips180-2.pdf
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"""
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__all__ = ['new', 'block_size', 'digest_size']
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from Crypto.Util.py3compat import *
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def __make_constructor():
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try:
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# The sha module is deprecated in Python 2.6, so use hashlib when possible.
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from hashlib import sha1 as _hash_new
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except ImportError:
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from .sha import new as _hash_new
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h = _hash_new()
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if hasattr(h, 'new') and hasattr(h, 'name') and hasattr(h, 'digest_size') and hasattr(h, 'block_size'):
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# The module from stdlib has the API that we need. Just use it.
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return _hash_new
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else:
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# Wrap the hash object in something that gives us the expected API.
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_copy_sentinel = object()
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class _SHA1(object):
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digest_size = 20
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block_size = 64
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oid = "1.3.14.3.2.26"
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def __init__(self, *args):
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if args and args[0] is _copy_sentinel:
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self._h = args[1]
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else:
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self._h = _hash_new(*args)
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def copy(self):
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return _SHA1(_copy_sentinel, self._h.copy())
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def update(self, *args):
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f = self.update = self._h.update
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f(*args)
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def digest(self):
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f = self.digest = self._h.digest
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return f()
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def hexdigest(self):
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f = self.hexdigest = self._h.hexdigest
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return f()
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_SHA1.new = _SHA1
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return _SHA1
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new = __make_constructor()
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del __make_constructor
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#: The size of the resulting hash in bytes.
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digest_size = new().digest_size
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#: The internal block size of the hash algorithm in bytes.
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block_size = new().block_size
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