hmac.h

   1 /* $OpenBSD: hmac.h,v 1.9 2014/06/24 01:13:21 djm 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 sshbuf;
  25 struct ssh_hmac_ctx;
  26 struct ssh_hmac_ctx *ssh_hmac_start(int alg);
  27
  28 /* Sets the state of the HMAC or resets the state if key == NULL */
  29 int ssh_hmac_init(struct ssh_hmac_ctx *ctx, const void *key, size_t klen)
  30         __attribute__((__bounded__(__buffer__, 2, 3)));
  31 int ssh_hmac_update(struct ssh_hmac_ctx *ctx, const void *m, size_t mlen)
  32         __attribute__((__bounded__(__buffer__, 2, 3)));
  33 int ssh_hmac_update_buffer(struct ssh_hmac_ctx *ctx, const struct sshbuf *b);
  34 int ssh_hmac_final(struct ssh_hmac_ctx *ctx, u_char *d, size_t dlen)
  35         __attribute__((__bounded__(__buffer__, 2, 3)));
  36 void ssh_hmac_free(struct ssh_hmac_ctx *ctx);
  37
  38 #endif /* _HMAC_H */