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/*
Copyright (C) 2006-2010 Werner Dittmann
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _ZRTPCRC32_H_
#define _ZRTPCRC32_H_
/**
*
* @file ZrtpCrc32.h
* @brief Methods to compute the CRC32 checksum for ZRTP packets
*
* @ingroup GNU_ZRTP
* @{
*
* @see ZrtpCallback
*/
/**
* Check if a buffer matches a given CRC32 checksum.
*
* @param buffer
* Pointer to the data buffer.
* @param length
* Length in bytes of the data buffer.
* @param crc32
* The CRC32 checksum.
*
* @return
* @c true if the CRC32 checksum matches the computed checksum of the
* buffer, @c false otherwise.
*/
bool zrtpCheckCksum(uint8_t *buffer, uint16_t length, uint32_t crc32);
/**
* Generate a CRC32 checksum of a data buffer
*
* @param buffer
* Pointer to the buffer.
* @param length
* Lenght of the buffer in bytes.
*
* @return
* A preliminary CRC32 checksum
*/
uint32_t zrtpGenerateCksum(uint8_t *buffer, uint16_t length);
/**
* Close CRC32 computation.
*
* @param crc32
* A preliminary CRC32 checksum.
*
* @return
* The ready to use CRC32 checksum in host order.
*/
uint32_t zrtpEndCksum(uint32_t crc32);
/**
* @}
*/
#endif
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