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Annotation of embedaddon/axTLS/crypto/hmac.c, revision 1.1.1.1

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