// SPDX-License-Identifier: GPL-2.0-only
/*
 * sm3-ce-glue.c - SM3 secure hash using ARMv8.2 Crypto Extensions
 *
 * Copyright (C) 2018 Linaro Ltd <ard.biesheuvel@linaro.org>
 */

#include <crypto/internal/hash.h>
#include <crypto/sm3.h>
#include <crypto/sm3_base.h>
#include <linux/cpufeature.h>
#include <linux/kernel.h>
#include <linux/module.h>

#include <asm/simd.h>

MODULE_DESCRIPTION("SM3 secure hash using ARMv8 Crypto Extensions");
MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
MODULE_LICENSE("GPL v2");

asmlinkage void sm3_ce_transform(struct sm3_state *sst, u8 const *src,
                                 int blocks);

static int sm3_ce_update(struct shash_desc *desc, const u8 *data,
                         unsigned int len)
{
        int remain;

        scoped_ksimd() {
                remain = sm3_base_do_update_blocks(desc, data, len, sm3_ce_transform);
        }
        return remain;
}

static int sm3_ce_finup(struct shash_desc *desc, const u8 *data,
                        unsigned int len, u8 *out)
{
        scoped_ksimd() {
                sm3_base_do_finup(desc, data, len, sm3_ce_transform);
        }
        return sm3_base_finish(desc, out);
}

static struct shash_alg sm3_alg = {
        .digestsize             = SM3_DIGEST_SIZE,
        .init                   = sm3_base_init,
        .update                 = sm3_ce_update,
        .finup                  = sm3_ce_finup,
        .descsize               = SM3_STATE_SIZE,
        .base.cra_name          = "sm3",
        .base.cra_driver_name   = "sm3-ce",
        .base.cra_flags         = CRYPTO_AHASH_ALG_BLOCK_ONLY |
                                  CRYPTO_AHASH_ALG_FINUP_MAX,
        .base.cra_blocksize     = SM3_BLOCK_SIZE,
        .base.cra_module        = THIS_MODULE,
        .base.cra_priority      = 400,
};

static int __init sm3_ce_mod_init(void)
{
        return crypto_register_shash(&sm3_alg);
}

static void __exit sm3_ce_mod_fini(void)
{
        crypto_unregister_shash(&sm3_alg);
}

module_cpu_feature_match(SM3, sm3_ce_mod_init);
module_exit(sm3_ce_mod_fini);