1/*	$NetBSD: chacha.h,v 1.1 2020/07/25 22:46:34 riastradh Exp $	*/
2
3/*-
4 * Copyright (c) 2020 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#ifndef	_SYS_CRYPTO_CHACHA_CHACHA_H
30#define	_SYS_CRYPTO_CHACHA_CHACHA_H
31
32#include <sys/types.h>
33
34#define	CHACHA_KEYBYTES			32
35
36#define	CHACHA_CORE_KEYBYTES		CHACHA_KEYBYTES
37#define	CHACHA_CORE_INBYTES		16
38#define	CHACHA_CORE_CONSTBYTES		16
39#define	CHACHA_CORE_OUTBYTES		64
40
41#define	HCHACHA_KEYBYTES		CHACHA_KEYBYTES
42#define	HCHACHA_INBYTES			16
43#define	HCHACHA_CONSTBYTES		16
44#define	HCHACHA_OUTBYTES		32
45
46#define	CHACHA_STREAM_KEYBYTES		CHACHA_KEYBYTES
47#define	CHACHA_STREAM_NONCEBYTES	12
48
49#define	XCHACHA_STREAM_KEYBYTES		CHACHA_KEYBYTES
50#define	XCHACHA_STREAM_NONCEBYTES	24
51
52extern const uint8_t chacha_const32[16];
53
54void	chacha_core(uint8_t[restrict static CHACHA_CORE_OUTBYTES],
55	    const uint8_t[static CHACHA_CORE_INBYTES],
56	    const uint8_t[static CHACHA_CORE_KEYBYTES],
57	    const uint8_t[static CHACHA_CORE_CONSTBYTES],
58	    unsigned);
59void	hchacha(uint8_t[restrict static HCHACHA_OUTBYTES],
60	    const uint8_t[static HCHACHA_INBYTES],
61	    const uint8_t[static HCHACHA_KEYBYTES],
62	    const uint8_t[static HCHACHA_CONSTBYTES],
63	    unsigned);
64void	chacha_stream(uint8_t *restrict, size_t,
65	    uint32_t,
66	    const uint8_t[static CHACHA_STREAM_NONCEBYTES],
67	    const uint8_t[static CHACHA_STREAM_KEYBYTES],
68	    unsigned);
69void	chacha_stream_xor(uint8_t *, const uint8_t *, size_t,
70	    uint32_t,
71	    const uint8_t[static CHACHA_STREAM_NONCEBYTES],
72	    const uint8_t[static CHACHA_STREAM_KEYBYTES],
73	    unsigned);
74void	xchacha_stream(uint8_t *restrict, size_t,
75	    uint32_t,
76	    const uint8_t[static XCHACHA_STREAM_NONCEBYTES],
77	    const uint8_t[static XCHACHA_STREAM_KEYBYTES],
78	    unsigned);
79void	xchacha_stream_xor(uint8_t *, const uint8_t *, size_t,
80	    uint32_t,
81	    const uint8_t[static XCHACHA_STREAM_NONCEBYTES],
82	    const uint8_t[static XCHACHA_STREAM_KEYBYTES],
83	    unsigned);
84
85#endif	/* _SYS_CRYPTO_CHACHA_CHACHA_H */
86