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Diffstat (limited to 'wsutil/crc32.h')
| -rw-r--r-- | wsutil/crc32.h | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/wsutil/crc32.h b/wsutil/crc32.h new file mode 100644 index 00000000..c6891730 --- /dev/null +++ b/wsutil/crc32.h @@ -0,0 +1,106 @@ +/** @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 */ |