// SPDX-License-Identifier: GPL-2.0 /* * SM4 Cipher Algorithm. * * Copyright (C) 2018 ARM Limited or its affiliates. * All rights reserved. */ #include <crypto/algapi.h>#include <crypto/sm4.h>#include <linux/module.h>#include <linux/init.h>#include <linux/types.h>#include <linux/errno.h>#include <asm/byteorder.h>#include <linux/unaligned.h> /** * sm4_setkey - Set the SM4 key. * @tfm:	The %crypto_tfm that is used in the context. * @in_key:	The input key. * @key_len:	The size of the key. * * This function uses sm4_expandkey() to expand the key. * &sm4_ctx _must_ be the private data embedded in @tfm which is * retrieved with crypto_tfm_ctx(). * * Return: 0 on success; -EINVAL on failure (only happens for bad key lengths) */static int sm4_setkey(struct crypto_tfm *tfm, const u8 *in_key,		       unsigned int key_len){	struct sm4_ctx *ctx = crypto_tfm_ctx(tfm); 	return sm4_expandkey(ctx, in_key, key_len);} /* encrypt a block of text */ static void sm4_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in){	const struct sm4_ctx *ctx = crypto_tfm_ctx(tfm); 	sm4_crypt_block(ctx->rkey_enc, out, in);} /* decrypt a block of text */ static void sm4_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in){	const struct sm4_ctx *ctx = crypto_tfm_ctx(tfm); 	sm4_crypt_block(ctx->rkey_dec, out, in);} static struct crypto_alg sm4_alg = {	.cra_name		=	"sm4",	.cra_driver_name	=	"sm4-generic",	.cra_priority		=	100,	.cra_flags		=	CRYPTO_ALG_TYPE_CIPHER,	.cra_blocksize		=	SM4_BLOCK_SIZE,	.cra_ctxsize		=	sizeof(struct sm4_ctx),	.cra_module		=	THIS_MODULE,	.cra_u			=	{		.cipher = {			.cia_min_keysize	=	SM4_KEY_SIZE,			.cia_max_keysize	=	SM4_KEY_SIZE,			.cia_setkey		=	sm4_setkey,			.cia_encrypt		=	sm4_encrypt,			.cia_decrypt		=	sm4_decrypt		}	}}; static int __init sm4_init(void){	return crypto_register_alg(&sm4_alg);} static void __exit sm4_fini(void){	crypto_unregister_alg(&sm4_alg);} module_init(sm4_init);module_exit(sm4_fini); MODULE_DESCRIPTION("SM4 Cipher Algorithm");MODULE_LICENSE("GPL v2");MODULE_ALIAS_CRYPTO("sm4");MODULE_ALIAS_CRYPTO("sm4-generic");