// 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 <linux/init.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/types.h>
#include <crypto/sm3.h>
#include <crypto/sm3_base.h>
#include <linux/bitops.h>
#include <asm/byteorder.h>
#include <linux/unaligned.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)
{
	sm3_update(shash_desc_ctx(desc), data, len);
	return 0;
}

static int crypto_sm3_final(struct shash_desc *desc, u8 *out)
{
	sm3_final(shash_desc_ctx(desc), out);
	return 0;
}

static int crypto_sm3_finup(struct shash_desc *desc, const u8 *data,
			unsigned int len, u8 *hash)
{
	struct sm3_state *sctx = shash_desc_ctx(desc);

	if (len)
		sm3_update(sctx, data, len);
	sm3_final(sctx, hash);
	return 0;
}

static struct shash_alg sm3_alg = {
	.digestsize	=	SM3_DIGEST_SIZE,
	.init		=	sm3_base_init,
	.update		=	crypto_sm3_update,
	.final		=	crypto_sm3_final,
	.finup		=	crypto_sm3_finup,
	.descsize	=	sizeof(struct sm3_state),
	.base		=	{
		.cra_name	 =	"sm3",
		.cra_driver_name =	"sm3-generic",
		.cra_priority	=	100,
		.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);
}

subsys_initcall(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");