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-ce-cipher-glue.c (2045B)

      1// SPDX-License-Identifier: GPL-2.0
      2
      3#include <asm/neon.h>
      4#include <asm/simd.h>
      5#include <crypto/sm4.h>
      6#include <crypto/internal/simd.h>
      7#include <linux/module.h>
      8#include <linux/cpufeature.h>
      9#include <linux/crypto.h>
     10#include <linux/types.h>
     11
     12MODULE_ALIAS_CRYPTO("sm4");
     13MODULE_ALIAS_CRYPTO("sm4-ce");
     14MODULE_DESCRIPTION("SM4 symmetric cipher using ARMv8 Crypto Extensions");
     15MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
     16MODULE_LICENSE("GPL v2");
     17
     18asmlinkage void sm4_ce_do_crypt(const u32 *rk, void *out, const void *in);
     19
     20static int sm4_ce_setkey(struct crypto_tfm *tfm, const u8 *key,
     21		       unsigned int key_len)
     22{
     23	struct sm4_ctx *ctx = crypto_tfm_ctx(tfm);
     24
     25	return sm4_expandkey(ctx, key, key_len);
     26}
     27
     28static void sm4_ce_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
     29{
     30	const struct sm4_ctx *ctx = crypto_tfm_ctx(tfm);
     31
     32	if (!crypto_simd_usable()) {
     33		sm4_crypt_block(ctx->rkey_enc, out, in);
     34	} else {
     35		kernel_neon_begin();
     36		sm4_ce_do_crypt(ctx->rkey_enc, out, in);
     37		kernel_neon_end();
     38	}
     39}
     40
     41static void sm4_ce_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
     42{
     43	const struct sm4_ctx *ctx = crypto_tfm_ctx(tfm);
     44
     45	if (!crypto_simd_usable()) {
     46		sm4_crypt_block(ctx->rkey_dec, out, in);
     47	} else {
     48		kernel_neon_begin();
     49		sm4_ce_do_crypt(ctx->rkey_dec, out, in);
     50		kernel_neon_end();
     51	}
     52}
     53
     54static struct crypto_alg sm4_ce_alg = {
     55	.cra_name			= "sm4",
     56	.cra_driver_name		= "sm4-ce",
     57	.cra_priority			= 300,
     58	.cra_flags			= CRYPTO_ALG_TYPE_CIPHER,
     59	.cra_blocksize			= SM4_BLOCK_SIZE,
     60	.cra_ctxsize			= sizeof(struct sm4_ctx),
     61	.cra_module			= THIS_MODULE,
     62	.cra_u.cipher = {
     63		.cia_min_keysize	= SM4_KEY_SIZE,
     64		.cia_max_keysize	= SM4_KEY_SIZE,
     65		.cia_setkey		= sm4_ce_setkey,
     66		.cia_encrypt		= sm4_ce_encrypt,
     67		.cia_decrypt		= sm4_ce_decrypt
     68	}
     69};
     70
     71static int __init sm4_ce_mod_init(void)
     72{
     73	return crypto_register_alg(&sm4_ce_alg);
     74}
     75
     76static void __exit sm4_ce_mod_fini(void)
     77{
     78	crypto_unregister_alg(&sm4_ce_alg);
     79}
     80
     81module_cpu_feature_match(SM4, sm4_ce_mod_init);
     82module_exit(sm4_ce_mod_fini);