mirror of
https://github.com/rsmarples/dhcpcd.git
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87 lines
2.6 KiB
C
87 lines
2.6 KiB
C
/*
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* dhcpcd - DHCP client daemon
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* Copyright (c) 2006-2014 Roy Marples <roy@marples.name>
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* All rights reserved
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <inttypes.h>
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#include <string.h>
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#include "crypt.h"
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#ifdef HAVE_MD5_H
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#include <md5.h>
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#else
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#include "md5.h"
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#endif
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#define HMAC_PAD_LEN 64
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#define IPAD 0x36
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#define OPAD 0x5C
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/* hmac_md5 as per RFC3118 */
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void
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hmac_md5(const uint8_t *text, size_t text_len,
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const uint8_t *key, size_t key_len,
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uint8_t *digest)
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{
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uint8_t k_ipad[HMAC_PAD_LEN], k_opad[HMAC_PAD_LEN];
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uint8_t tk[MD5_DIGEST_LENGTH];
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int i;
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MD5_CTX context;
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/* Ensure key is no bigger than HMAC_PAD_LEN */
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if (key_len > HMAC_PAD_LEN) {
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MD5Init(&context);
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MD5Update(&context, key, key_len);
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MD5Final(tk, &context);
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key = tk;
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key_len = MD5_DIGEST_LENGTH;
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}
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/* store key in pads */
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memcpy(k_ipad, key, key_len);
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memcpy(k_opad, key, key_len);
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memset(k_ipad + key_len, 0, sizeof(k_ipad) - key_len);
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memset(k_opad + key_len, 0, sizeof(k_opad) - key_len);
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/* XOR key with ipad and opad values */
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for (i = 0; i < HMAC_PAD_LEN; i++) {
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k_ipad[i] ^= IPAD;
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k_opad[i] ^= OPAD;
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}
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/* inner MD5 */
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MD5Init(&context);
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MD5Update(&context, k_ipad, HMAC_PAD_LEN);
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MD5Update(&context, text, text_len);
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MD5Final(digest, &context);
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/* outer MD5 */
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MD5Init(&context);
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MD5Update(&context, k_opad, HMAC_PAD_LEN);
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MD5Update(&context, digest, MD5_DIGEST_LENGTH);
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MD5Final(digest, &context);
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}
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