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/*
Copyright (C) 2006, 2005, 2004 Erik Eliasson, Johan Bilien, Werner Dittmann
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/**
* Methods to compute a SHA256 HMAC.
*
* @author Erik Eliasson <eliasson@it.kth.se>
* @author Johan Bilien <jobi@via.ecp.fr>
* @author Werner Dittmann <Werner.Dittmann@t-online.de>
*/
#ifndef HMAC_SHA256_H
#define HMAC_SHA256_H
/**
* @file hmac256.h
* @brief Function that provide SHA256 HMAC support
*
* @ingroup GNU_ZRTP
* @{
*/
#include <stdint.h>
#ifndef SHA256_DIGEST_LENGTH
#define SHA256_DIGEST_LENGTH 32
#endif
/**
* Compute SHA256 HMAC.
*
* This functions takes one data chunk and computes its SHA256 HMAC.
*
* @param key
* The MAC key.
* @param key_length
* Lneght of the MAC key in bytes
* @param data
* Points to the data chunk.
* @param data_length
* Length of the data in bytes
* @param mac
* Points to a buffer that receives the computed digest. This
* buffer must have a size of at least 32 bytes (SHA256_DIGEST_LENGTH).
* @param mac_length
* Point to an integer that receives the length of the computed HMAC.
*/
void hmac_sha256( uint8_t* key, uint32_t key_length,
uint8_t* data, int32_t data_length,
uint8_t* mac, uint32_t* mac_length );
/**
* Compute SHA256 HMAC over several data cunks.
*
* This functions takes several data chunk and computes the SHA256 HAMAC. It
* uses the openSSL HAMAC SHA256 implementation.
*
* @param key
* The MAC key.
* @param key_length
* Lneght of the MAC key in bytes
* @param data
* Points to an array of pointers that point to the data chunks. A NULL
* pointer in an array element terminates the data chunks.
* @param data_length
* Points to an array of integers that hold the length of each data chunk.
* @param mac
* Points to a buffer that receives the computed digest. This
* buffer must have a size of at least 32 bytes (SHA256_DIGEST_LENGTH).
* @param mac_length
* Point to an integer that receives the length of the computed HMAC.
*/
void hmac_sha256( uint8_t* key, uint32_t key_length,
uint8_t* data[], uint32_t data_length[],
uint8_t* mac, uint32_t* mac_length );
/**
* @}
*/
#endif
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