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
|
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from __future__ import absolute_import, division, print_function
from cryptography import utils
from cryptography.exceptions import (
AlreadyFinalized, UnsupportedAlgorithm, _Reasons
)
from cryptography.hazmat.backends.interfaces import HashBackend
from cryptography.hazmat.primitives import interfaces
@utils.register_interface(interfaces.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, interfaces.HashAlgorithm):
raise TypeError("Expected instance of interfaces.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(interfaces.HashAlgorithm)
class SHA1(object):
name = "sha1"
digest_size = 20
block_size = 64
@utils.register_interface(interfaces.HashAlgorithm)
class SHA224(object):
name = "sha224"
digest_size = 28
block_size = 64
@utils.register_interface(interfaces.HashAlgorithm)
class SHA256(object):
name = "sha256"
digest_size = 32
block_size = 64
@utils.register_interface(interfaces.HashAlgorithm)
class SHA384(object):
name = "sha384"
digest_size = 48
block_size = 128
@utils.register_interface(interfaces.HashAlgorithm)
class SHA512(object):
name = "sha512"
digest_size = 64
block_size = 128
@utils.register_interface(interfaces.HashAlgorithm)
class RIPEMD160(object):
name = "ripemd160"
digest_size = 20
block_size = 64
@utils.register_interface(interfaces.HashAlgorithm)
class Whirlpool(object):
name = "whirlpool"
digest_size = 64
block_size = 64
@utils.register_interface(interfaces.HashAlgorithm)
class MD5(object):
name = "md5"
digest_size = 16
block_size = 64
|
