1 /* $OpenBSD: hmac.h,v 1.6 2014/01/27 18:58:14 markus Exp $ */ 2 /* 3 * Copyright (c) 2014 Markus Friedl. All rights reserved. 4 * 5 * Permission to use, copy, modify, and distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18 #ifndef _HMAC_H 19 #define _HMAC_H 20 21 /* Returns the algorithm's digest length in bytes or 0 for invalid algorithm */ 22 size_t ssh_hmac_bytes(int alg); 23 24 struct ssh_hmac_ctx; 25 struct ssh_hmac_ctx *ssh_hmac_start(int alg); 26 27 /* Sets the state of the HMAC or resets the state if key == NULL */ 28 int ssh_hmac_init(struct ssh_hmac_ctx *ctx, const void *key, size_t klen) 29 __attribute__((__bounded__(__buffer__, 2, 3))); 30 int ssh_hmac_update(struct ssh_hmac_ctx *ctx, const void *m, size_t mlen) 31 __attribute__((__bounded__(__buffer__, 2, 3))); 32 int ssh_hmac_update_buffer(struct ssh_hmac_ctx *ctx, const Buffer *b); 33 int ssh_hmac_final(struct ssh_hmac_ctx *ctx, u_char *d, size_t dlen) 34 __attribute__((__bounded__(__buffer__, 2, 3))); 35 void ssh_hmac_free(struct ssh_hmac_ctx *ctx); 36 37 #endif /* _HMAC_H */ 38