mirror of
https://github.com/noDRM/DeDRM_tools.git
synced 2024-08-30 13:06:10 +06:00
89 lines
2.8 KiB
Python
89 lines
2.8 KiB
Python
# -*- 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']
|
|
|
|
from Crypto.Util.python_compat 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
|
|
return retval
|
|
|
|
# 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=""):
|
|
"""Return a new SHAd256 hashing object"""
|
|
return _SHAd256(_SHAd256._internal, SHA256.new(data))
|
|
|
|
# vim:set ts=4 sw=4 sts=4 expandtab:
|