Tristan Matthews | 0a329cc | 2013-07-17 13:20:14 -0400 | [diff] [blame] | 1 | /* $Id$ */ |
| 2 | /* |
| 3 | * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com) |
| 4 | * Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 19 | */ |
| 20 | #include <pjlib-util/hmac_sha1.h> |
| 21 | #include <pj/string.h> |
| 22 | |
| 23 | |
| 24 | PJ_DEF(void) pj_hmac_sha1_init(pj_hmac_sha1_context *hctx, |
| 25 | const pj_uint8_t *key, unsigned key_len) |
| 26 | { |
| 27 | pj_uint8_t k_ipad[64]; |
| 28 | pj_uint8_t tk[20]; |
| 29 | unsigned i; |
| 30 | |
| 31 | /* if key is longer than 64 bytes reset it to key=SHA1(key) */ |
| 32 | if (key_len > 64) { |
| 33 | pj_sha1_context tctx; |
| 34 | |
| 35 | pj_sha1_init(&tctx); |
| 36 | pj_sha1_update(&tctx, key, key_len); |
| 37 | pj_sha1_final(&tctx, tk); |
| 38 | |
| 39 | key = tk; |
| 40 | key_len = 20; |
| 41 | } |
| 42 | |
| 43 | /* |
| 44 | * HMAC = H(K XOR opad, H(K XOR ipad, text)) |
| 45 | */ |
| 46 | |
| 47 | /* start out by storing key in pads */ |
| 48 | pj_bzero( k_ipad, sizeof(k_ipad)); |
| 49 | pj_bzero( hctx->k_opad, sizeof(hctx->k_opad)); |
| 50 | pj_memcpy( k_ipad, key, key_len); |
| 51 | pj_memcpy( hctx->k_opad, key, key_len); |
| 52 | |
| 53 | /* XOR key with ipad and opad values */ |
| 54 | for (i=0; i<64; i++) { |
| 55 | k_ipad[i] ^= 0x36; |
| 56 | hctx->k_opad[i] ^= 0x5c; |
| 57 | } |
| 58 | /* |
| 59 | * perform inner SHA1 |
| 60 | */ |
| 61 | pj_sha1_init(&hctx->context); |
| 62 | pj_sha1_update(&hctx->context, k_ipad, 64); |
| 63 | } |
| 64 | |
| 65 | PJ_DEF(void) pj_hmac_sha1_update(pj_hmac_sha1_context *hctx, |
| 66 | const pj_uint8_t *input, unsigned input_len) |
| 67 | { |
| 68 | pj_sha1_update(&hctx->context, input, input_len); |
| 69 | } |
| 70 | |
| 71 | PJ_DEF(void) pj_hmac_sha1_final(pj_hmac_sha1_context *hctx, |
| 72 | pj_uint8_t digest[20]) |
| 73 | { |
| 74 | pj_sha1_final(&hctx->context, digest); |
| 75 | |
| 76 | /* |
| 77 | * perform outer SHA1 |
| 78 | */ |
| 79 | pj_sha1_init(&hctx->context); |
| 80 | pj_sha1_update(&hctx->context, hctx->k_opad, 64); |
| 81 | pj_sha1_update(&hctx->context, digest, 20); |
| 82 | pj_sha1_final(&hctx->context, digest); |
| 83 | } |
| 84 | |
| 85 | PJ_DEF(void) pj_hmac_sha1(const pj_uint8_t *input, unsigned input_len, |
| 86 | const pj_uint8_t *key, unsigned key_len, |
| 87 | pj_uint8_t digest[20] ) |
| 88 | { |
| 89 | pj_hmac_sha1_context ctx; |
| 90 | |
| 91 | pj_hmac_sha1_init(&ctx, key, key_len); |
| 92 | pj_hmac_sha1_update(&ctx, input, input_len); |
| 93 | pj_hmac_sha1_final(&ctx, digest); |
| 94 | } |
| 95 | |