// SPDX-License-Identifier: GPL-2.0-only
/*
 * SM3 secure hash, as specified by OSCCA GM/T 0004-2012 SM3 and
 * described at https://tools.ietf.org/html/draft-shen-sm3-hash-01
 *
 * Copyright (C) 2017 ARM Limited or its affiliates.
 * Written by Gilad Ben-Yossef <gilad@benyossef.com>
 * Copyright (C) 2021 Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
 */

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

const u8 sm3_zero_message_hash[SM3_DIGEST_SIZE] = {
        0x1A, 0xB2, 0x1D, 0x83, 0x55, 0xCF, 0xA1, 0x7F,
        0x8e, 0x61, 0x19, 0x48, 0x31, 0xE8, 0x1A, 0x8F,
        0x22, 0xBE, 0xC8, 0xC7, 0x28, 0xFE, 0xFB, 0x74,
        0x7E, 0xD0, 0x35, 0xEB, 0x50, 0x82, 0xAA, 0x2B
};
EXPORT_SYMBOL_GPL(sm3_zero_message_hash);

static int crypto_sm3_update(struct shash_desc *desc, const u8 *data,
                          unsigned int len)
{
        return sm3_base_do_update_blocks(desc, data, len, sm3_block_generic);
}

static int crypto_sm3_finup(struct shash_desc *desc, const u8 *data,
                        unsigned int len, u8 *hash)
{
        sm3_base_do_finup(desc, data, len, sm3_block_generic);
        return sm3_base_finish(desc, hash);
}

static struct shash_alg sm3_alg = {
        .digestsize     =       SM3_DIGEST_SIZE,
        .init           =       sm3_base_init,
        .update         =       crypto_sm3_update,
        .finup          =       crypto_sm3_finup,
        .descsize       =       SM3_STATE_SIZE,
        .base           =       {
                .cra_name        =      "sm3",
                .cra_driver_name =      "sm3-generic",
                .cra_priority   =       100,
                .cra_flags       =      CRYPTO_AHASH_ALG_BLOCK_ONLY |
                                        CRYPTO_AHASH_ALG_FINUP_MAX,
                .cra_blocksize   =      SM3_BLOCK_SIZE,
                .cra_module      =      THIS_MODULE,
        }
};

static int __init sm3_generic_mod_init(void)
{
        return crypto_register_shash(&sm3_alg);
}

static void __exit sm3_generic_mod_fini(void)
{
        crypto_unregister_shash(&sm3_alg);
}

module_init(sm3_generic_mod_init);
module_exit(sm3_generic_mod_fini);

MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("SM3 Secure Hash Algorithm");

MODULE_ALIAS_CRYPTO("sm3");
MODULE_ALIAS_CRYPTO("sm3-generic");