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/* $Id: hmac_sha1.h 3553 2011-05-05 06:14:19Z nanang $ */
/*
* Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com)
* Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org>
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef __PJLIB_UTIL_HMAC_SHA1_H__
#define __PJLIB_UTIL_HMAC_SHA1_H__
/**
* @file hmac_sha1.h
* @brief HMAC SHA1 Message Authentication
*/
#include <pj/types.h>
#include <pjlib-util/sha1.h>
PJ_BEGIN_DECL
/**
* @defgroup PJLIB_UTIL_HMAC_SHA1 HMAC SHA1 Message Authentication
* @ingroup PJLIB_UTIL_ENCRYPTION
* @{
*
* This module contains the implementation of HMAC: Keyed-Hashing
* for Message Authentication, as described in RFC 2104.
*/
/**
* The HMAC-SHA1 context used in the incremental HMAC calculation.
*/
typedef struct pj_hmac_sha1_context
{
pj_sha1_context context; /**< SHA1 context */
pj_uint8_t k_opad[64]; /**< opad xor-ed with key */
} pj_hmac_sha1_context;
/**
* Calculate HMAC-SHA1 digest for the specified input and key with this
* single function call.
*
* @param input Pointer to the input stream.
* @param input_len Length of input stream in bytes.
* @param key Pointer to the authentication key.
* @param key_len Length of the authentication key.
* @param digest Buffer to be filled with HMAC SHA1 digest.
*/
PJ_DECL(void) pj_hmac_sha1(const pj_uint8_t *input, unsigned input_len,
const pj_uint8_t *key, unsigned key_len,
pj_uint8_t digest[20]);
/**
* Initiate HMAC-SHA1 context for incremental hashing.
*
* @param hctx HMAC-SHA1 context.
* @param key Pointer to the authentication key.
* @param key_len Length of the authentication key.
*/
PJ_DECL(void) pj_hmac_sha1_init(pj_hmac_sha1_context *hctx,
const pj_uint8_t *key, unsigned key_len);
/**
* Append string to the message.
*
* @param hctx HMAC-SHA1 context.
* @param input Pointer to the input stream.
* @param input_len Length of input stream in bytes.
*/
PJ_DECL(void) pj_hmac_sha1_update(pj_hmac_sha1_context *hctx,
const pj_uint8_t *input,
unsigned input_len);
/**
* Finish the message and return the digest.
*
* @param hctx HMAC-SHA1 context.
* @param digest Buffer to be filled with HMAC SHA1 digest.
*/
PJ_DECL(void) pj_hmac_sha1_final(pj_hmac_sha1_context *hctx,
pj_uint8_t digest[20]);
/**
* @}
*/
PJ_END_DECL
#endif /* __PJLIB_UTIL_HMAC_SHA1_H__ */
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