1 /* 2 * hmac.h 3 * 4 * interface to hmac auth_type_t 5 * 6 * David A. McGrew 7 * Cisco Systems, Inc. 8 * 9 */ 10 /* 11 * 12 * Copyright (c) 2001-2006, Cisco Systems, Inc. 13 * All rights reserved. 14 * 15 * Redistribution and use in source and binary forms, with or without 16 * modification, are permitted provided that the following conditions 17 * are met: 18 * 19 * Redistributions of source code must retain the above copyright 20 * notice, this list of conditions and the following disclaimer. 21 * 22 * Redistributions in binary form must reproduce the above 23 * copyright notice, this list of conditions and the following 24 * disclaimer in the documentation and/or other materials provided 25 * with the distribution. 26 * 27 * Neither the name of the Cisco Systems, Inc. nor the names of its 28 * contributors may be used to endorse or promote products derived 29 * from this software without specific prior written permission. 30 * 31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 34 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 35 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 36 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 37 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 38 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 39 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 40 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 41 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 42 * OF THE POSSIBILITY OF SUCH DAMAGE. 43 * 44 */ 45 46 #ifndef HMAC_H 47 #define HMAC_H 48 49 #include "auth.h" 50 #include "sha1.h" 51 52 typedef struct { 53 uint8_t opad[64]; 54 sha1_ctx_t ctx; 55 sha1_ctx_t init_ctx; 56 } hmac_ctx_t; 57 58 err_status_t 59 hmac_alloc(auth_t **a, int key_len, int out_len); 60 61 err_status_t 62 hmac_dealloc(auth_t *a); 63 64 err_status_t 65 hmac_init(hmac_ctx_t *state, const uint8_t *key, int key_len); 66 67 err_status_t 68 hmac_start(hmac_ctx_t *state); 69 70 err_status_t 71 hmac_update(hmac_ctx_t *state, const uint8_t *message, int msg_octets); 72 73 err_status_t 74 hmac_compute(hmac_ctx_t *state, const void *message, 75 int msg_octets, int tag_len, uint8_t *result); 76 77 78 #endif /* HMAC_H */ 79