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1 /* $OpenBSD: cipher-chachapoly.h,v 1.4 2014/06/24 01:13:21 djm Exp $ */
2 
3 /*
4  * Copyright (c) Damien Miller 2013 <djm@mindrot.org>
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 #ifndef CHACHA_POLY_AEAD_H
19 #define CHACHA_POLY_AEAD_H
20 
21 #include <sys/types.h>
22 #include "chacha.h"
23 #include "poly1305.h"
24 
25 #define CHACHA_KEYLEN	32 /* Only 256 bit keys used here */
26 
27 struct chachapoly_ctx {
28 	struct chacha_ctx main_ctx, header_ctx;
29 };
30 
31 int	chachapoly_init(struct chachapoly_ctx *cpctx,
32     const u_char *key, u_int keylen)
33     __attribute__((__bounded__(__buffer__, 2, 3)));
34 int	chachapoly_crypt(struct chachapoly_ctx *cpctx, u_int seqnr,
35     u_char *dest, const u_char *src, u_int len, u_int aadlen, u_int authlen,
36     int do_encrypt);
37 int	chachapoly_get_length(struct chachapoly_ctx *cpctx,
38     u_int *plenp, u_int seqnr, const u_char *cp, u_int len)
39     __attribute__((__bounded__(__buffer__, 4, 5)));
40 
41 #endif /* CHACHA_POLY_AEAD_H */
42