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
|
/** @file
* Declaration of CRC-32 routine and table
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#ifndef __CRC32_H__
#define __CRC32_H__
#include <wireshark.h>
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
#define CRC32_CCITT_SEED 0xFFFFFFFF
#define CRC32C_PRELOAD 0xffffffff
#define CRC32_MPEG2_SEED 0xFFFFFFFF
/*
* Byte swap fix contributed by Dave Wysochanski <davidw@netapp.com>.
*/
#define CRC32C_SWAP(crc32c_value) \
(((crc32c_value & 0xff000000) >> 24) | \
((crc32c_value & 0x00ff0000) >> 8) | \
((crc32c_value & 0x0000ff00) << 8) | \
((crc32c_value & 0x000000ff) << 24))
/** Lookup the crc value in the crc32_ccitt_table
@param pos Position in the table. */
WS_DLL_PUBLIC uint32_t crc32_ccitt_table_lookup (unsigned char pos);
/** Lookup the crc value in the crc32c_table
@param pos Position in the table. */
WS_DLL_PUBLIC uint32_t crc32c_table_lookup (unsigned char pos);
/** Compute CRC32C checksum of a buffer of data.
@param buf The buffer containing the data.
@param len The number of bytes to include in the computation.
@param crc The preload value for the CRC32C computation.
@return The CRC32C checksum. */
WS_DLL_PUBLIC uint32_t crc32c_calculate(const void *buf, int len, uint32_t crc);
/** Compute CRC32C checksum of a buffer of data without swapping seed crc
or completed checksum
@param buf The buffer containing the data.
@param len The number of bytes to include in the computation.
@param crc The preload value for the CRC32C computation.
@return The CRC32C checksum. */
WS_DLL_PUBLIC uint32_t crc32c_calculate_no_swap(const void *buf, int len, uint32_t crc);
/** Compute CRC32 CCITT checksum of a buffer of data.
@param buf The buffer containing the data.
@param len The number of bytes to include in the computation.
@return The CRC32 CCITT checksum. */
WS_DLL_PUBLIC uint32_t crc32_ccitt(const uint8_t *buf, unsigned len);
/** Compute CRC32 CCITT checksum of a buffer of data. If computing the
* checksum over multiple buffers and you want to feed the partial CRC32
* back in, remember to take the 1's complement of the partial CRC32 first.
@param buf The buffer containing the data.
@param len The number of bytes to include in the computation.
@param seed The seed to use.
@return The CRC32 CCITT checksum (using the given seed). */
WS_DLL_PUBLIC uint32_t crc32_ccitt_seed(const uint8_t *buf, unsigned len, uint32_t seed);
/** Compute MPEG-2 CRC32 checksum of a buffer of data.
@param buf The buffer containing the data.
@param len The number of bytes to include in the computation.
@param seed The seed to use.
@return The CRC32 MPEG-2 checksum (using the given seed). */
WS_DLL_PUBLIC uint32_t crc32_mpeg2_seed(const uint8_t *buf, unsigned len, uint32_t seed);
/** Computes CRC32 checksum for the given data with the polynom 0x0AA725CF using
* precompiled CRC table
* @param buf a pointer to a buffer of the given length
* @param len the length of the given buffer
* @param seed The seed to use.
* @return the CRC32 checksum for the buffer
*/
WS_DLL_PUBLIC uint32_t crc32_0x0AA725CF_seed(const uint8_t *buf, unsigned len, uint32_t seed);
/** Computes CRC32 checksum for the given data with the polynom 0x5D6DCB using
* precompiled CRC table
* @param buf a pointer to a buffer of the given length
* @param len the length of the given buffer
* @param seed The seed to use.
* @return the CRC32 checksum for the buffer
*/
WS_DLL_PUBLIC uint32_t crc32_0x5D6DCB_seed(const uint8_t *buf, unsigned len, uint32_t seed);
WS_DLL_PUBLIC int Dot11DecryptWepDecrypt(
const unsigned char *seed,
const size_t seed_len,
unsigned char *cypher_text,
const size_t data_len);
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* crc32.h */
|
