Ashley Mills / axTLS

Rough and ready port of axTLS

crypto/hmac.c@0:5a29fd060ac8, 2013-05-13 (annotated)

Committer:
ashleymills
Date:
Mon May 13 18:15:18 2013 +0000
Revision:
0:5a29fd060ac8
initial commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ashleymills 0:5a29fd060ac8 1 /*
ashleymills 0:5a29fd060ac8 2 * Copyright (c) 2007, Cameron Rich
ashleymills 0:5a29fd060ac8 3 *
ashleymills 0:5a29fd060ac8 4 * All rights reserved.
ashleymills 0:5a29fd060ac8 5 *
ashleymills 0:5a29fd060ac8 6 * Redistribution and use in source and binary forms, with or without
ashleymills 0:5a29fd060ac8 7 * modification, are permitted provided that the following conditions are met:
ashleymills 0:5a29fd060ac8 8 *
ashleymills 0:5a29fd060ac8 9 * * Redistributions of source code must retain the above copyright notice,
ashleymills 0:5a29fd060ac8 10 * this list of conditions and the following disclaimer.
ashleymills 0:5a29fd060ac8 11 * * Redistributions in binary form must reproduce the above copyright notice,
ashleymills 0:5a29fd060ac8 12 * this list of conditions and the following disclaimer in the documentation
ashleymills 0:5a29fd060ac8 13 * and/or other materials provided with the distribution.
ashleymills 0:5a29fd060ac8 14 * * Neither the name of the axTLS project nor the names of its contributors
ashleymills 0:5a29fd060ac8 15 * may be used to endorse or promote products derived from this software
ashleymills 0:5a29fd060ac8 16 * without specific prior written permission.
ashleymills 0:5a29fd060ac8 17 *
ashleymills 0:5a29fd060ac8 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
ashleymills 0:5a29fd060ac8 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
ashleymills 0:5a29fd060ac8 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
ashleymills 0:5a29fd060ac8 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
ashleymills 0:5a29fd060ac8 22 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
ashleymills 0:5a29fd060ac8 23 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
ashleymills 0:5a29fd060ac8 24 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
ashleymills 0:5a29fd060ac8 25 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
ashleymills 0:5a29fd060ac8 26 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
ashleymills 0:5a29fd060ac8 27 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
ashleymills 0:5a29fd060ac8 28 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
ashleymills 0:5a29fd060ac8 29 */
ashleymills 0:5a29fd060ac8 30
ashleymills 0:5a29fd060ac8 31 /**
ashleymills 0:5a29fd060ac8 32 * HMAC implementation - This code was originally taken from RFC2104
ashleymills 0:5a29fd060ac8 33 * See http://www.ietf.org/rfc/rfc2104.txt and
ashleymills 0:5a29fd060ac8 34 * http://www.faqs.org/rfcs/rfc2202.html
ashleymills 0:5a29fd060ac8 35 */
ashleymills 0:5a29fd060ac8 36
ashleymills 0:5a29fd060ac8 37 #include <string.h>
ashleymills 0:5a29fd060ac8 38 #include "os_port.h"
ashleymills 0:5a29fd060ac8 39 #include "crypto.h"
ashleymills 0:5a29fd060ac8 40
ashleymills 0:5a29fd060ac8 41 /**
ashleymills 0:5a29fd060ac8 42 * Perform HMAC-MD5
ashleymills 0:5a29fd060ac8 43 * NOTE: does not handle keys larger than the block size.
ashleymills 0:5a29fd060ac8 44 */
ashleymills 0:5a29fd060ac8 45 void hmac_md5(const uint8_t *msg, int length, const uint8_t *key,
ashleymills 0:5a29fd060ac8 46 int key_len, uint8_t *digest)
ashleymills 0:5a29fd060ac8 47 {
ashleymills 0:5a29fd060ac8 48 MD5_CTX context;
ashleymills 0:5a29fd060ac8 49 uint8_t k_ipad[64];
ashleymills 0:5a29fd060ac8 50 uint8_t k_opad[64];
ashleymills 0:5a29fd060ac8 51 int i;
ashleymills 0:5a29fd060ac8 52
ashleymills 0:5a29fd060ac8 53 memset(k_ipad, 0, sizeof k_ipad);
ashleymills 0:5a29fd060ac8 54 memset(k_opad, 0, sizeof k_opad);
ashleymills 0:5a29fd060ac8 55 memcpy(k_ipad, key, key_len);
ashleymills 0:5a29fd060ac8 56 memcpy(k_opad, key, key_len);
ashleymills 0:5a29fd060ac8 57
ashleymills 0:5a29fd060ac8 58 for (i = 0; i < 64; i++)
ashleymills 0:5a29fd060ac8 59 {
ashleymills 0:5a29fd060ac8 60 k_ipad[i] ^= 0x36;
ashleymills 0:5a29fd060ac8 61 k_opad[i] ^= 0x5c;
ashleymills 0:5a29fd060ac8 62 }
ashleymills 0:5a29fd060ac8 63
ashleymills 0:5a29fd060ac8 64 MD5_Init(&context);
ashleymills 0:5a29fd060ac8 65 MD5_Update(&context, k_ipad, 64);
ashleymills 0:5a29fd060ac8 66 MD5_Update(&context, msg, length);
ashleymills 0:5a29fd060ac8 67 MD5_Final(digest, &context);
ashleymills 0:5a29fd060ac8 68 MD5_Init(&context);
ashleymills 0:5a29fd060ac8 69 MD5_Update(&context, k_opad, 64);
ashleymills 0:5a29fd060ac8 70 MD5_Update(&context, digest, MD5_SIZE);
ashleymills 0:5a29fd060ac8 71 MD5_Final(digest, &context);
ashleymills 0:5a29fd060ac8 72 }
ashleymills 0:5a29fd060ac8 73
ashleymills 0:5a29fd060ac8 74 /**
ashleymills 0:5a29fd060ac8 75 * Perform HMAC-SHA1
ashleymills 0:5a29fd060ac8 76 * NOTE: does not handle keys larger than the block size.
ashleymills 0:5a29fd060ac8 77 */
ashleymills 0:5a29fd060ac8 78 void hmac_sha1(const uint8_t *msg, int length, const uint8_t *key,
ashleymills 0:5a29fd060ac8 79 int key_len, uint8_t *digest)
ashleymills 0:5a29fd060ac8 80 {
ashleymills 0:5a29fd060ac8 81 SHA1_CTX context;
ashleymills 0:5a29fd060ac8 82 uint8_t k_ipad[64];
ashleymills 0:5a29fd060ac8 83 uint8_t k_opad[64];
ashleymills 0:5a29fd060ac8 84 int i;
ashleymills 0:5a29fd060ac8 85
ashleymills 0:5a29fd060ac8 86 memset(k_ipad, 0, sizeof k_ipad);
ashleymills 0:5a29fd060ac8 87 memset(k_opad, 0, sizeof k_opad);
ashleymills 0:5a29fd060ac8 88 memcpy(k_ipad, key, key_len);
ashleymills 0:5a29fd060ac8 89 memcpy(k_opad, key, key_len);
ashleymills 0:5a29fd060ac8 90
ashleymills 0:5a29fd060ac8 91 for (i = 0; i < 64; i++)
ashleymills 0:5a29fd060ac8 92 {
ashleymills 0:5a29fd060ac8 93 k_ipad[i] ^= 0x36;
ashleymills 0:5a29fd060ac8 94 k_opad[i] ^= 0x5c;
ashleymills 0:5a29fd060ac8 95 }
ashleymills 0:5a29fd060ac8 96
ashleymills 0:5a29fd060ac8 97 SHA1_Init(&context);
ashleymills 0:5a29fd060ac8 98 SHA1_Update(&context, k_ipad, 64);
ashleymills 0:5a29fd060ac8 99 SHA1_Update(&context, msg, length);
ashleymills 0:5a29fd060ac8 100 SHA1_Final(digest, &context);
ashleymills 0:5a29fd060ac8 101 SHA1_Init(&context);
ashleymills 0:5a29fd060ac8 102 SHA1_Update(&context, k_opad, 64);
ashleymills 0:5a29fd060ac8 103 SHA1_Update(&context, digest, SHA1_SIZE);
ashleymills 0:5a29fd060ac8 104 SHA1_Final(digest, &context);
ashleymills 0:5a29fd060ac8 105 }