/usr/lib/python2.7/dist-packages/cryptography/hazmat/primitives/hashes.py is in python-cryptography 1.2.3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 | # This file is dual licensed under the terms of the Apache License, Version
# 2.0, and the BSD License. See the LICENSE file in the root of this repository
# for complete details.
from __future__ import absolute_import, division, print_function
import abc
import six
from cryptography import utils
from cryptography.exceptions import (
AlreadyFinalized, UnsupportedAlgorithm, _Reasons
)
from cryptography.hazmat.backends.interfaces import HashBackend
@six.add_metaclass(abc.ABCMeta)
class HashAlgorithm(object):
@abc.abstractproperty
def name(self):
"""
A string naming this algorithm (e.g. "sha256", "md5").
"""
@abc.abstractproperty
def digest_size(self):
"""
The size of the resulting digest in bytes.
"""
@abc.abstractproperty
def block_size(self):
"""
The internal block size of the hash algorithm in bytes.
"""
@six.add_metaclass(abc.ABCMeta)
class HashContext(object):
@abc.abstractproperty
def algorithm(self):
"""
A HashAlgorithm that will be used by this context.
"""
@abc.abstractmethod
def update(self, data):
"""
Processes the provided bytes through the hash.
"""
@abc.abstractmethod
def finalize(self):
"""
Finalizes the hash context and returns the hash digest as bytes.
"""
@abc.abstractmethod
def copy(self):
"""
Return a HashContext that is a copy of the current context.
"""
@utils.register_interface(HashContext)
class Hash(object):
def __init__(self, algorithm, backend, ctx=None):
if not isinstance(backend, HashBackend):
raise UnsupportedAlgorithm(
"Backend object does not implement HashBackend.",
_Reasons.BACKEND_MISSING_INTERFACE
)
if not isinstance(algorithm, HashAlgorithm):
raise TypeError("Expected instance of hashes.HashAlgorithm.")
self._algorithm = algorithm
self._backend = backend
if ctx is None:
self._ctx = self._backend.create_hash_ctx(self.algorithm)
else:
self._ctx = ctx
algorithm = utils.read_only_property("_algorithm")
def update(self, data):
if self._ctx is None:
raise AlreadyFinalized("Context was already finalized.")
if not isinstance(data, bytes):
raise TypeError("data must be bytes.")
self._ctx.update(data)
def copy(self):
if self._ctx is None:
raise AlreadyFinalized("Context was already finalized.")
return Hash(
self.algorithm, backend=self._backend, ctx=self._ctx.copy()
)
def finalize(self):
if self._ctx is None:
raise AlreadyFinalized("Context was already finalized.")
digest = self._ctx.finalize()
self._ctx = None
return digest
@utils.register_interface(HashAlgorithm)
class SHA1(object):
name = "sha1"
digest_size = 20
block_size = 64
@utils.register_interface(HashAlgorithm)
class SHA224(object):
name = "sha224"
digest_size = 28
block_size = 64
@utils.register_interface(HashAlgorithm)
class SHA256(object):
name = "sha256"
digest_size = 32
block_size = 64
@utils.register_interface(HashAlgorithm)
class SHA384(object):
name = "sha384"
digest_size = 48
block_size = 128
@utils.register_interface(HashAlgorithm)
class SHA512(object):
name = "sha512"
digest_size = 64
block_size = 128
@utils.register_interface(HashAlgorithm)
class RIPEMD160(object):
name = "ripemd160"
digest_size = 20
block_size = 64
@utils.register_interface(HashAlgorithm)
class Whirlpool(object):
name = "whirlpool"
digest_size = 64
block_size = 64
@utils.register_interface(HashAlgorithm)
class MD5(object):
name = "md5"
digest_size = 16
block_size = 64
|