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/* $Id: hmac_md5.c 3553 2011-05-05 06:14:19Z nanang $ */
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* Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com)
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* Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org>
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#include <pjlib-util/hmac_md5.h>
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#include <pj/string.h>
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PJ_DEF(void) pj_hmac_md5_init(pj_hmac_md5_context *hctx,
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const pj_uint8_t *key, unsigned key_len)
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pj_uint8_t k_ipad[64];
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/* if key is longer than 64 bytes reset it to key=MD5(key) */
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pj_md5_update(&tctx, key, key_len);
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pj_md5_final(&tctx, tk);
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* HMAC = H(K XOR opad, H(K XOR ipad, text))
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/* start out by storing key in pads */
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pj_bzero( k_ipad, sizeof(k_ipad));
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pj_bzero( hctx->k_opad, sizeof(hctx->k_opad));
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pj_memcpy( k_ipad, key, key_len);
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pj_memcpy( hctx->k_opad, key, key_len);
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/* XOR key with ipad and opad values */
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for (i=0; i<64; i++) {
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hctx->k_opad[i] ^= 0x5c;
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pj_md5_init(&hctx->context);
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pj_md5_update(&hctx->context, k_ipad, 64);
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PJ_DEF(void) pj_hmac_md5_update(pj_hmac_md5_context *hctx,
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const pj_uint8_t *input,
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pj_md5_update(&hctx->context, input, input_len);
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PJ_DEF(void) pj_hmac_md5_final(pj_hmac_md5_context *hctx,
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pj_uint8_t digest[16])
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pj_md5_final(&hctx->context, digest);
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pj_md5_init(&hctx->context);
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pj_md5_update(&hctx->context, hctx->k_opad, 64);
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pj_md5_update(&hctx->context, digest, 16);
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pj_md5_final(&hctx->context, digest);
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PJ_DEF(void) pj_hmac_md5( const pj_uint8_t *input, unsigned input_len,
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const pj_uint8_t *key, unsigned key_len,
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pj_uint8_t digest[16] )
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pj_hmac_md5_context ctx;
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pj_hmac_md5_init(&ctx, key, key_len);
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pj_hmac_md5_update(&ctx, input, input_len);
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pj_hmac_md5_final(&ctx, digest);