1/*	$OpenBSD: arc4.h,v 1.3 2007/09/11 12:07:05 djm Exp $	*/
2/*
3 * Copyright (c) 2003 Markus Friedl <markus@openbsd.org>
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#define RC4STATE 256
19#define RC4KEYLEN 16
20
21struct rc4_ctx {
22	u_int8_t x, y;
23	u_int8_t state[RC4STATE];
24};
25
26void	rc4_keysetup(struct rc4_ctx *, u_char *, u_int32_t)
27    __attribute__((__bounded__(__buffer__,2,3)));
28void	rc4_crypt(struct rc4_ctx *, u_char *, u_char *, u_int32_t)
29    __attribute__((__bounded__(__buffer__,2,4)))
30    __attribute__((__bounded__(__buffer__,3,4)));
31void	rc4_getbytes(struct rc4_ctx *, u_char *, u_int32_t)
32    __attribute__((__bounded__(__buffer__,2,3)));
33void	rc4_skip(struct rc4_ctx *, u_int32_t);
34