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
|
# 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
import abc
import binascii
import six
class BaseHash(six.with_metaclass(abc.ABCMeta)):
def __init__(self, data=None, backend=None, ctx=None):
if backend is None:
from cryptography.bindings import _default_backend
backend = _default_backend
self._backend = backend
if ctx is None:
self._ctx = self._backend.create_hash_context(self)
else:
self._ctx = None
if data is not None:
self.update(data)
def update(self, data):
if isinstance(data, six.text_type):
raise TypeError("Unicode-objects must be encoded before hashing")
self._backend.update_hash_context(self._ctx, data)
def copy(self):
return self.__class__(api=self._api, ctx=self._copy_ctx())
def digest(self):
return self._backend.finalize_hash_context(self._copy_ctx(),
self.digest_size)
def hexdigest(self):
return str(binascii.hexlify(self.digest()).decode("ascii"))
def _copy_ctx(self):
return self._backend.copy_hash_context(self._ctx)
class SHA1(BaseHash):
name = "sha1"
digest_size = 20
block_size = 64
class SHA224(BaseHash):
name = "sha224"
digest_size = 28
block_size = 64
class SHA256(BaseHash):
name = "sha256"
digest_size = 32
block_size = 64
class SHA384(BaseHash):
name = "sha384"
digest_size = 48
block_size = 128
class SHA512(BaseHash):
name = "sha512"
digest_size = 64
block_size = 128
class RIPEMD160(BaseHash):
name = "ripemd160"
digest_size = 20
block_size = 64
class Whirlpool(BaseHash):
name = "whirlpool"
digest_size = 64
block_size = 64
class MD5(BaseHash):
name = "md5"
digest_size = 16
block_size = 64
|