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 void sm4_ce_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
21{
22	const struct crypto_sm4_ctx *ctx = crypto_tfm_ctx(tfm);
23
24	if (!crypto_simd_usable()) {
25		crypto_sm4_encrypt(tfm, out, in);
26	} else {
27		kernel_neon_begin();
28		sm4_ce_do_crypt(ctx->rkey_enc, out, in);
29		kernel_neon_end();
30	}
31}
32
33static void sm4_ce_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
34{
35	const struct crypto_sm4_ctx *ctx = crypto_tfm_ctx(tfm);
36
37	if (!crypto_simd_usable()) {
38		crypto_sm4_decrypt(tfm, out, in);
39	} else {
40		kernel_neon_begin();
41		sm4_ce_do_crypt(ctx->rkey_dec, out, in);
42		kernel_neon_end();
43	}
44}
45
46static struct crypto_alg sm4_ce_alg = {
47	.cra_name			= "sm4",
48	.cra_driver_name		= "sm4-ce",
49	.cra_priority			= 200,
50	.cra_flags			= CRYPTO_ALG_TYPE_CIPHER,
51	.cra_blocksize			= SM4_BLOCK_SIZE,
52	.cra_ctxsize			= sizeof(struct crypto_sm4_ctx),
53	.cra_module			= THIS_MODULE,
54	.cra_u.cipher = {
55		.cia_min_keysize	= SM4_KEY_SIZE,
56		.cia_max_keysize	= SM4_KEY_SIZE,
57		.cia_setkey		= crypto_sm4_set_key,
58		.cia_encrypt		= sm4_ce_encrypt,
59		.cia_decrypt		= sm4_ce_decrypt
60	}
61};
62
63static int __init sm4_ce_mod_init(void)
64{
65	return crypto_register_alg(&sm4_ce_alg);
66}
67
68static void __exit sm4_ce_mod_fini(void)
69{
70	crypto_unregister_alg(&sm4_ce_alg);
71}
72
73module_cpu_feature_match(SM4, sm4_ce_mod_init);
74module_exit(sm4_ce_mod_fini);
75