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File Name : SHAd256.py

# -*- coding: ascii -*-
#
#  Random/Fortuna/SHAd256.py : SHA_d-256 hash function implementation
#
# Written in 2008 by Dwayne C. Litzenberger <dlitz@dlitz.net>
#
# ===================================================================
# 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.
# ===================================================================

"""\
SHA_d-256 hash function implementation.

This module should comply with PEP 247.
"""

__revision__ = "$Id$"
__all__ = ['new', 'digest_size']

import sys
if sys.version_info[0] == 2 and sys.version_info[1] == 1:
    from Crypto.Util.py21compat import *
from Crypto.Util.py3compat import *

from binascii import b2a_hex

from Crypto.Hash import SHA256

assert SHA256.digest_size == 32

class _SHAd256(object):
    """SHA-256, doubled.

Returns SHA-256(SHA-256(data)).
    """

digest_size = SHA256.digest_size

_internal = object()

def __init__(self, internal_api_check, sha256_hash_obj):
        if internal_api_check is not self._internal:
            raise AssertionError("Do not instantiate this class directly.  Use %s.new()" % (__name__,))
        self._h = sha256_hash_obj

# PEP 247 "copy" method
    def copy(self):
        """Return a copy of this hashing object"""
        return _SHAd256(SHAd256._internal, self._h.copy())

# PEP 247 "digest" method
    def digest(self):
        """Return the hash value of this object as a binary string"""
        retval = SHA256.new(self._h.digest()).digest()
        assert len(retval) == 32
        return retval

# PEP 247 "hexdigest" method
    def hexdigest(self):
        """Return the hash value of this object as a (lowercase) hexadecimal string"""
        retval = b2a_hex(self.digest())
        assert len(retval) == 64
        if sys.version_info[0] == 2:
            return retval
        else:
            return retval.decode()

# PEP 247 "update" method
    def update(self, data):
        self._h.update(data)

# PEP 247 module-level "digest_size" variable
digest_size = _SHAd256.digest_size

# PEP 247 module-level "new" function
def new(data=None):
    """Return a new SHAd256 hashing object"""
    if not data:
        data=b("")
    sha = _SHAd256(_SHAd256._internal, SHA256.new(data))
    sha.new = globals()['new']
    return sha

# vim:set ts=4 sw=4 sts=4 expandtab:

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2020-06-24 06:39:47
..	dir	-	root/root	0755	2020-06-24 06:39:47
FortunaAccumulator.py	text/x-python	6.62 KB	root/root	0644	2013-10-14 09:38:10
FortunaAccumulator.pyc	application/octet-stream	5.4 KB	root/root	0644	2019-03-07 11:22:17
FortunaAccumulator.pyo	application/octet-stream	5.18 KB	root/root	0644	2019-03-07 11:22:17
FortunaGenerator.py	text/x-python	5.14 KB	root/root	0644	2013-10-14 09:38:10
FortunaGenerator.pyc	application/octet-stream	4.07 KB	root/root	0644	2019-03-07 11:22:17
FortunaGenerator.pyo	application/octet-stream	3.8 KB	root/root	0644	2019-03-07 11:22:17
SHAd256.py	text/x-python	3.03 KB	root/root	0644	2012-05-24 12:55:30
SHAd256.pyc	application/octet-stream	2.85 KB	root/root	0644	2019-03-07 11:22:17
SHAd256.pyo	application/octet-stream	2.74 KB	root/root	0644	2019-03-07 11:22:17
__init__.py	inode/x-empty	0 B	root/root	0644	2012-05-24 12:55:30
__init__.pyc	application/octet-stream	155 B	root/root	0644	2019-03-07 11:22:17
__init__.pyo	application/octet-stream	155 B	root/root	0644	2019-03-07 11:22:17

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