/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * AES block cipher, optimized for ARM
 *
 * Copyright (C) 2017 Linaro Ltd.
 * Copyright 2026 Google LLC
 */

asmlinkage void __aes_arm_encrypt(const u32 rk[], int rounds,
                                  const u8 in[AES_BLOCK_SIZE],
                                  u8 out[AES_BLOCK_SIZE]);
asmlinkage void __aes_arm_decrypt(const u32 inv_rk[], int rounds,
                                  const u8 in[AES_BLOCK_SIZE],
                                  u8 out[AES_BLOCK_SIZE]);

static void aes_preparekey_arch(union aes_enckey_arch *k,
                                union aes_invkey_arch *inv_k,
                                const u8 *in_key, int key_len, int nrounds)
{
        aes_expandkey_generic(k->rndkeys, inv_k ? inv_k->inv_rndkeys : NULL,
                              in_key, key_len);
}

static void aes_encrypt_arch(const struct aes_enckey *key,
                             u8 out[AES_BLOCK_SIZE],
                             const u8 in[AES_BLOCK_SIZE])
{
        if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) &&
            !IS_ALIGNED((uintptr_t)out | (uintptr_t)in, 4)) {
                u8 bounce_buf[AES_BLOCK_SIZE] __aligned(4);

                memcpy(bounce_buf, in, AES_BLOCK_SIZE);
                __aes_arm_encrypt(key->k.rndkeys, key->nrounds, bounce_buf,
                                  bounce_buf);
                memcpy(out, bounce_buf, AES_BLOCK_SIZE);
                return;
        }
        __aes_arm_encrypt(key->k.rndkeys, key->nrounds, in, out);
}

static void aes_decrypt_arch(const struct aes_key *key,
                             u8 out[AES_BLOCK_SIZE],
                             const u8 in[AES_BLOCK_SIZE])
{
        if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) &&
            !IS_ALIGNED((uintptr_t)out | (uintptr_t)in, 4)) {
                u8 bounce_buf[AES_BLOCK_SIZE] __aligned(4);

                memcpy(bounce_buf, in, AES_BLOCK_SIZE);
                __aes_arm_decrypt(key->inv_k.inv_rndkeys, key->nrounds,
                                  bounce_buf, bounce_buf);
                memcpy(out, bounce_buf, AES_BLOCK_SIZE);
                return;
        }
        __aes_arm_decrypt(key->inv_k.inv_rndkeys, key->nrounds, in, out);
}