cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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sm4_generic.c (2143B)

      1// SPDX-License-Identifier: GPL-2.0
      2
      3/*
      4 * SM4 Cipher Algorithm.
      5 *
      6 * Copyright (C) 2018 ARM Limited or its affiliates.
      7 * All rights reserved.
      8 */
      9
     10#include <crypto/sm4.h>
     11#include <linux/module.h>
     12#include <linux/init.h>
     13#include <linux/types.h>
     14#include <linux/errno.h>
     15#include <linux/crypto.h>
     16#include <asm/byteorder.h>
     17#include <asm/unaligned.h>
     18
     19/**
     20 * sm4_setkey - Set the SM4 key.
     21 * @tfm:	The %crypto_tfm that is used in the context.
     22 * @in_key:	The input key.
     23 * @key_len:	The size of the key.
     24 *
     25 * This function uses sm4_expandkey() to expand the key.
     26 * &sm4_ctx _must_ be the private data embedded in @tfm which is
     27 * retrieved with crypto_tfm_ctx().
     28 *
     29 * Return: 0 on success; -EINVAL on failure (only happens for bad key lengths)
     30 */
     31static int sm4_setkey(struct crypto_tfm *tfm, const u8 *in_key,
     32		       unsigned int key_len)
     33{
     34	struct sm4_ctx *ctx = crypto_tfm_ctx(tfm);
     35
     36	return sm4_expandkey(ctx, in_key, key_len);
     37}
     38
     39/* encrypt a block of text */
     40
     41static void sm4_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
     42{
     43	const struct sm4_ctx *ctx = crypto_tfm_ctx(tfm);
     44
     45	sm4_crypt_block(ctx->rkey_enc, out, in);
     46}
     47
     48/* decrypt a block of text */
     49
     50static void sm4_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
     51{
     52	const struct sm4_ctx *ctx = crypto_tfm_ctx(tfm);
     53
     54	sm4_crypt_block(ctx->rkey_dec, out, in);
     55}
     56
     57static struct crypto_alg sm4_alg = {
     58	.cra_name		=	"sm4",
     59	.cra_driver_name	=	"sm4-generic",
     60	.cra_priority		=	100,
     61	.cra_flags		=	CRYPTO_ALG_TYPE_CIPHER,
     62	.cra_blocksize		=	SM4_BLOCK_SIZE,
     63	.cra_ctxsize		=	sizeof(struct sm4_ctx),
     64	.cra_module		=	THIS_MODULE,
     65	.cra_u			=	{
     66		.cipher = {
     67			.cia_min_keysize	=	SM4_KEY_SIZE,
     68			.cia_max_keysize	=	SM4_KEY_SIZE,
     69			.cia_setkey		=	sm4_setkey,
     70			.cia_encrypt		=	sm4_encrypt,
     71			.cia_decrypt		=	sm4_decrypt
     72		}
     73	}
     74};
     75
     76static int __init sm4_init(void)
     77{
     78	return crypto_register_alg(&sm4_alg);
     79}
     80
     81static void __exit sm4_fini(void)
     82{
     83	crypto_unregister_alg(&sm4_alg);
     84}
     85
     86subsys_initcall(sm4_init);
     87module_exit(sm4_fini);
     88
     89MODULE_DESCRIPTION("SM4 Cipher Algorithm");
     90MODULE_LICENSE("GPL v2");
     91MODULE_ALIAS_CRYPTO("sm4");
     92MODULE_ALIAS_CRYPTO("sm4-generic");