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
|
# ===================================================================
#
# Copyright (c) 2019, Legrandin <helderijs@gmail.com>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in
# the documentation and/or other materials provided with the
# distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
# COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
# ===================================================================
import sys
from Cryptodome.Cipher import _create_cipher
from Cryptodome.Util._raw_api import (load_pycryptodome_raw_lib,
VoidPointer, SmartPointer, c_size_t,
c_uint8_ptr, c_uint)
_raw_blowfish_lib = load_pycryptodome_raw_lib(
"Cryptodome.Cipher._raw_eksblowfish",
"""
int EKSBlowfish_start_operation(const uint8_t key[],
size_t key_len,
const uint8_t salt[16],
size_t salt_len,
unsigned cost,
unsigned invert,
void **pResult);
int EKSBlowfish_encrypt(const void *state,
const uint8_t *in,
uint8_t *out,
size_t data_len);
int EKSBlowfish_decrypt(const void *state,
const uint8_t *in,
uint8_t *out,
size_t data_len);
int EKSBlowfish_stop_operation(void *state);
"""
)
def _create_base_cipher(dict_parameters):
"""This method instantiates and returns a smart pointer to
a low-level base cipher. It will absorb named parameters in
the process."""
try:
key = dict_parameters.pop("key")
salt = dict_parameters.pop("salt")
cost = dict_parameters.pop("cost")
except KeyError as e:
raise TypeError("Missing EKSBlowfish parameter: " + str(e))
invert = dict_parameters.pop("invert", True)
if len(key) not in key_size:
raise ValueError("Incorrect EKSBlowfish key length (%d bytes)" % len(key))
start_operation = _raw_blowfish_lib.EKSBlowfish_start_operation
stop_operation = _raw_blowfish_lib.EKSBlowfish_stop_operation
void_p = VoidPointer()
result = start_operation(c_uint8_ptr(key),
c_size_t(len(key)),
c_uint8_ptr(salt),
c_size_t(len(salt)),
c_uint(cost),
c_uint(int(invert)),
void_p.address_of())
if result:
raise ValueError("Error %X while instantiating the EKSBlowfish cipher"
% result)
return SmartPointer(void_p.get(), stop_operation)
def new(key, mode, salt, cost, invert):
"""Create a new EKSBlowfish cipher
Args:
key (bytes, bytearray, memoryview):
The secret key to use in the symmetric cipher.
Its length can vary from 0 to 72 bytes.
mode (one of the supported ``MODE_*`` constants):
The chaining mode to use for encryption or decryption.
salt (bytes, bytearray, memoryview):
The salt that bcrypt uses to thwart rainbow table attacks
cost (integer):
The complexity factor in bcrypt
invert (bool):
If ``False``, in the inner loop use ``ExpandKey`` first over the salt
and then over the key, as defined in
the `original bcrypt specification <https://www.usenix.org/legacy/events/usenix99/provos/provos_html/node4.html>`_.
If ``True``, reverse the order, as in the first implementation of
`bcrypt` in OpenBSD.
:Return: an EKSBlowfish object
"""
kwargs = { 'salt':salt, 'cost':cost, 'invert':invert }
return _create_cipher(sys.modules[__name__], key, mode, **kwargs)
MODE_ECB = 1
# Size of a data block (in bytes)
block_size = 8
# Size of a key (in bytes)
key_size = range(0, 72 + 1)
|