sm4-ce-cipher-glue.c

 1// SPDX-License-Identifier: GPL-2.0
 2
 3#include <asm/neon.h>
 4#include <asm/simd.h>
 5#include <crypto/algapi.h>
 6#include <crypto/sm4.h>
 7#include <crypto/internal/simd.h>
 8#include <linux/module.h>
 9#include <linux/cpufeature.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		scoped_ksimd()
36			sm4_ce_do_crypt(ctx->rkey_enc, out, in);
37	}
38}
39
40static void sm4_ce_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
41{
42	const struct sm4_ctx *ctx = crypto_tfm_ctx(tfm);
43
44	if (!crypto_simd_usable()) {
45		sm4_crypt_block(ctx->rkey_dec, out, in);
46	} else {
47		scoped_ksimd()
48			sm4_ce_do_crypt(ctx->rkey_dec, out, in);
49	}
50}
51
52static struct crypto_alg sm4_ce_alg = {
53	.cra_name			= "sm4",
54	.cra_driver_name		= "sm4-ce",
55	.cra_priority			= 300,
56	.cra_flags			= CRYPTO_ALG_TYPE_CIPHER,
57	.cra_blocksize			= SM4_BLOCK_SIZE,
58	.cra_ctxsize			= sizeof(struct sm4_ctx),
59	.cra_module			= THIS_MODULE,
60	.cra_u.cipher = {
61		.cia_min_keysize	= SM4_KEY_SIZE,
62		.cia_max_keysize	= SM4_KEY_SIZE,
63		.cia_setkey		= sm4_ce_setkey,
64		.cia_encrypt		= sm4_ce_encrypt,
65		.cia_decrypt		= sm4_ce_decrypt
66	}
67};
68
69static int __init sm4_ce_mod_init(void)
70{
71	return crypto_register_alg(&sm4_ce_alg);
72}
73
74static void __exit sm4_ce_mod_fini(void)
75{
76	crypto_unregister_alg(&sm4_ce_alg);
77}
78
79module_cpu_feature_match(SM4, sm4_ce_mod_init);
80module_exit(sm4_ce_mod_fini);