1/*	$NetBSD: aes_keysched.c,v 1.2 2025/11/23 22:44:14 riastradh Exp $	*/
2
3/*-
4 * Copyright (c) 2025 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#include <sys/cdefs.h>
30__KERNEL_RCSID(1, "$NetBSD: aes_keysched.c,v 1.2 2025/11/23 22:44:14 riastradh Exp $");
31
32#ifdef _KERNEL_OPT
33#include "opt_aes.h"
34#endif
35
36#include <sys/types.h>
37
38#include <crypto/aes/aes_keysched.h>
39
40#ifdef AES_BEAR64
41#include <crypto/aes/aes_bear64.h>
42#else
43#include <crypto/aes/aes_bear.h>
44#endif
45
46/*
47 * aes_keysched_enc(rk, key, keybytes)
48 *
49 *	Compute the standard AES encryption key schedule, expanding a
50 *	16-, 24-, or 32-byte key into 44, 52, or 60 32-bit round keys
51 *	for encryption.  Returns the number of rounds for the key of
52 *	this length.
53 */
54u_int
55aes_keysched_enc(uint32_t *rk, const void *key, size_t keybytes)
56{
57
58#ifdef AES_BEAR64
59	return br_aes_ct64_keysched_stdenc(rk, key, keybytes);
60#else
61	return br_aes_ct_keysched_stdenc(rk, key, keybytes);
62#endif
63}
64
65/*
66 * aes_keysched_dec(rk, key, keybytes)
67 *
68 *	Compute the standard AES decryption key schedule, expanding a
69 *	16-, 24-, or 32-byte key into 44, 52, or 60 32-bit round keys
70 *	and applying InvMixColumns for decryption.  Returns the number
71 *	of rounds for the key of this length.
72 */
73u_int
74aes_keysched_dec(uint32_t *rk, const void *key, size_t keybytes)
75{
76
77#ifdef AES_BEAR64
78	return br_aes_ct64_keysched_stddec(rk, key, keybytes);
79#else
80	return br_aes_ct_keysched_stddec(rk, key, keybytes);
81#endif
82}
83