/*      $NetBSD: aes_armv8.c,v 1.5 2020/07/25 22:33:04 riastradh Exp $  */

/*-
* Copyright (c) 2020 The NetBSD Foundation, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(1, "$NetBSD: aes_armv8.c,v 1.5 2020/07/25 22:33:04 riastradh Exp $");

#ifdef _KERNEL
#include <sys/types.h>
#include <sys/proc.h>
#include <sys/systm.h>
#else
#include <assert.h>
#include <err.h>
#include <stdint.h>
#include <string.h>
#define KASSERT                 assert
#define panic(fmt, args...)     err(1, fmt, args)
#endif

#include <crypto/aes/aes.h>
#include <crypto/aes/aes_impl.h>
#include <crypto/aes/arch/arm/aes_armv8.h>

#include <aarch64/armreg.h>

#ifdef _KERNEL
#include <arm/fpu.h>
#else
#include <sys/sysctl.h>
#include <stddef.h>
#define fpu_kern_enter()        ((void)0)
#define fpu_kern_leave()        ((void)0)
#endif

static void
aesarmv8_setenckey(struct aesenc *enc, const uint8_t key[static 16],
   uint32_t nrounds)
{

       switch (nrounds) {
       case 10:
               aesarmv8_setenckey128(enc, key);
               break;
       case 12:
               aesarmv8_setenckey192(enc, key);
               break;
       case 14:
               aesarmv8_setenckey256(enc, key);
               break;
       default:
               panic("invalid AES rounds: %u", nrounds);
       }
}

static void
aesarmv8_setenckey_impl(struct aesenc *enc, const uint8_t key[static 16],
   uint32_t nrounds)
{

       fpu_kern_enter();
       aesarmv8_setenckey(enc, key, nrounds);
       fpu_kern_leave();
}

static void
aesarmv8_setdeckey_impl(struct aesdec *dec, const uint8_t key[static 16],
   uint32_t nrounds)
{
       struct aesenc enc;

       fpu_kern_enter();
       aesarmv8_setenckey(&enc, key, nrounds);
       aesarmv8_enctodec(&enc, dec, nrounds);
       fpu_kern_leave();

       explicit_memset(&enc, 0, sizeof enc);
}

static void
aesarmv8_enc_impl(const struct aesenc *enc, const uint8_t in[static 16],
   uint8_t out[static 16], uint32_t nrounds)
{

       fpu_kern_enter();
       aesarmv8_enc(enc, in, out, nrounds);
       fpu_kern_leave();
}

static void
aesarmv8_dec_impl(const struct aesdec *dec, const uint8_t in[static 16],
   uint8_t out[static 16], uint32_t nrounds)
{

       fpu_kern_enter();
       aesarmv8_dec(dec, in, out, nrounds);
       fpu_kern_leave();
}

static void
aesarmv8_cbc_enc_impl(const struct aesenc *enc, const uint8_t in[static 16],
   uint8_t out[static 16], size_t nbytes, uint8_t iv[static 16],
   uint32_t nrounds)
{

       KASSERT(nbytes % 16 == 0);

       fpu_kern_enter();
       aesarmv8_cbc_enc(enc, in, out, nbytes, iv, nrounds);
       fpu_kern_leave();
}

static void
aesarmv8_cbc_dec_impl(const struct aesdec *dec, const uint8_t in[static 16],
   uint8_t out[static 16], size_t nbytes, uint8_t iv[static 16],
   uint32_t nrounds)
{

       KASSERT(nbytes % 16 == 0);

       fpu_kern_enter();

       if (nbytes % 128) {
               aesarmv8_cbc_dec1(dec, in, out, nbytes % 128, iv, nrounds);
               in += nbytes % 128;
               out += nbytes % 128;
               nbytes -= nbytes % 128;
       }

       KASSERT(nbytes % 128 == 0);
       if (nbytes)
               aesarmv8_cbc_dec8(dec, in, out, nbytes, iv, nrounds);

       fpu_kern_leave();
}

static void
aesarmv8_xts_enc_impl(const struct aesenc *enc, const uint8_t in[static 16],
   uint8_t out[static 16], size_t nbytes, uint8_t tweak[static 16],
   uint32_t nrounds)
{

       KASSERT(nbytes % 16 == 0);

       fpu_kern_enter();

       if (nbytes % 128) {
               aesarmv8_xts_enc1(enc, in, out, nbytes % 128, tweak, nrounds);
               in += nbytes % 128;
               out += nbytes % 128;
               nbytes -= nbytes % 128;
       }

       KASSERT(nbytes % 128 == 0);
       if (nbytes)
               aesarmv8_xts_enc8(enc, in, out, nbytes, tweak, nrounds);

       fpu_kern_leave();
}

static void
aesarmv8_xts_dec_impl(const struct aesdec *dec, const uint8_t in[static 16],
   uint8_t out[static 16], size_t nbytes, uint8_t tweak[static 16],
   uint32_t nrounds)
{

       KASSERT(nbytes % 16 == 0);

       fpu_kern_enter();

       if (nbytes % 128) {
               aesarmv8_xts_dec1(dec, in, out, nbytes % 128, tweak, nrounds);
               in += nbytes % 128;
               out += nbytes % 128;
               nbytes -= nbytes % 128;
       }

       KASSERT(nbytes % 128 == 0);
       if (nbytes)
               aesarmv8_xts_dec8(dec, in, out, nbytes, tweak, nrounds);

       fpu_kern_leave();
}

static void
aesarmv8_cbcmac_update1_impl(const struct aesenc *enc,
   const uint8_t in[static 16], size_t nbytes, uint8_t auth[static 16],
   uint32_t nrounds)
{

       KASSERT(nbytes);
       KASSERT(nbytes % 16 == 0);

       fpu_kern_enter();
       aesarmv8_cbcmac_update1(enc, in, nbytes, auth, nrounds);
       fpu_kern_leave();
}

static void
aesarmv8_ccm_enc1_impl(const struct aesenc *enc, const uint8_t in[static 16],
   uint8_t out[static 16], size_t nbytes, uint8_t authctr[static 32],
   uint32_t nrounds)
{

       KASSERT(nbytes);
       KASSERT(nbytes % 16 == 0);

       fpu_kern_enter();
       aesarmv8_ccm_enc1(enc, in, out, nbytes, authctr, nrounds);
       fpu_kern_leave();
}

static void
aesarmv8_ccm_dec1_impl(const struct aesenc *enc, const uint8_t in[static 16],
   uint8_t out[static 16], size_t nbytes, uint8_t authctr[static 32],
   uint32_t nrounds)
{

       KASSERT(nbytes);
       KASSERT(nbytes % 16 == 0);

       fpu_kern_enter();
       aesarmv8_ccm_dec1(enc, in, out, nbytes, authctr, nrounds);
       fpu_kern_leave();
}

static int
aesarmv8_xts_update_selftest(void)
{
       static const struct {
               uint8_t in[16], out[16];
       } cases[] = {
               {{1}, {2}},
               {{0,0,0,0x80}, {0,0,0,0,1}},
               {{0,0,0,0,0,0,0,0x80}, {0,0,0,0,0,0,0,0,1}},
               {{0,0,0,0x80,0,0,0,0x80}, {0,0,0,0,1,0,0,0,1}},
               {{0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0x80}, {0x87}},
               {{0,0,0,0,0,0,0,0x80,0,0,0,0,0,0,0,0x80},
                {0x87,0,0,0,0,0,0,0,1}},
               {{0,0,0,0x80,0,0,0,0,0,0,0,0,0,0,0,0x80}, {0x87,0,0,0,1}},
               {{0,0,0,0x80,0,0,0,0x80,0,0,0,0,0,0,0,0x80},
                {0x87,0,0,0,1,0,0,0,1}},
       };
       unsigned i;
       uint8_t tweak[16];

       for (i = 0; i < sizeof(cases)/sizeof(cases[0]); i++) {
               aesarmv8_xts_update(cases[i].in, tweak);
               if (memcmp(tweak, cases[i].out, 16))
                       return -1;
       }

       /* Success!  */
       return 0;
}

static int
aesarmv8_probe(void)
{
       struct aarch64_sysctl_cpu_id *id;
       int result = 0;

       /* Verify that the CPU supports AES.  */
#ifdef _KERNEL
       id = &curcpu()->ci_id;
#else
       struct aarch64_sysctl_cpu_id ids;
       size_t idlen;
       id = &ids;
       idlen = sizeof ids;
       if (sysctlbyname("machdep.cpu0.cpu_id", id, &idlen, NULL, 0))
               return -1;
       if (idlen != sizeof ids)
               return -1;
#endif
       switch (__SHIFTOUT(id->ac_aa64isar0, ID_AA64ISAR0_EL1_AES)) {
       case ID_AA64ISAR0_EL1_AES_AES:
       case ID_AA64ISAR0_EL1_AES_PMUL:
               break;
       default:
               return -1;
       }

       fpu_kern_enter();

       /* Verify that our XTS tweak update logic works.  */
       if (aesarmv8_xts_update_selftest())
               result = -1;

       fpu_kern_leave();

       return result;
}

struct aes_impl aes_armv8_impl = {
       .ai_name = "ARMv8.0-AES",
       .ai_probe = aesarmv8_probe,
       .ai_setenckey = aesarmv8_setenckey_impl,
       .ai_setdeckey = aesarmv8_setdeckey_impl,
       .ai_enc = aesarmv8_enc_impl,
       .ai_dec = aesarmv8_dec_impl,
       .ai_cbc_enc = aesarmv8_cbc_enc_impl,
       .ai_cbc_dec = aesarmv8_cbc_dec_impl,
       .ai_xts_enc = aesarmv8_xts_enc_impl,
       .ai_xts_dec = aesarmv8_xts_dec_impl,
       .ai_cbcmac_update1 = aesarmv8_cbcmac_update1_impl,
       .ai_ccm_enc1 = aesarmv8_ccm_enc1_impl,
       .ai_ccm_dec1 = aesarmv8_ccm_dec1_impl,
};

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