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      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  */
     54 u_int
     55 aes_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  */
     73 u_int
     74 aes_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