1 /* $NetBSD: hmac.h,v 1.2 2018/04/06 18:59:00 christos Exp $ */ 2 /* $OpenBSD: hmac.h,v 1.9 2014/06/24 01:13:21 djm Exp $ */ 3 /* 4 * Copyright (c) 2014 Markus Friedl. All rights reserved. 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19 #ifndef _HMAC_H 20 #define _HMAC_H 21 22 /* Returns the algorithm's digest length in bytes or 0 for invalid algorithm */ 23 size_t ssh_hmac_bytes(int alg); 24 25 struct sshbuf; 26 struct ssh_hmac_ctx; 27 struct ssh_hmac_ctx *ssh_hmac_start(int alg); 28 29 /* Sets the state of the HMAC or resets the state if key == NULL */ 30 int ssh_hmac_init(struct ssh_hmac_ctx *ctx, const void *key, size_t klen) 31 __attribute__((__bounded__(__buffer__, 2, 3))); 32 int ssh_hmac_update(struct ssh_hmac_ctx *ctx, const void *m, size_t mlen) 33 __attribute__((__bounded__(__buffer__, 2, 3))); 34 int ssh_hmac_update_buffer(struct ssh_hmac_ctx *ctx, const struct sshbuf *b); 35 int ssh_hmac_final(struct ssh_hmac_ctx *ctx, u_char *d, size_t dlen) 36 __attribute__((__bounded__(__buffer__, 2, 3))); 37 void ssh_hmac_free(struct ssh_hmac_ctx *ctx); 38 39 #endif /* _HMAC_H */ 40