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// 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);
}
subsys_initcall(sm4_init);
module_exit(sm4_fini);
MODULE_DESCRIPTION("SM4 Cipher Algorithm");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS_CRYPTO("sm4");
MODULE_ALIAS_CRYPTO("sm4-generic");
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