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Annotation of embedaddon/axTLS/crypto/hmac.c, revision 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: }