| 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 | } |