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 
12 MODULE_ALIAS_CRYPTO("sm4");
13 MODULE_ALIAS_CRYPTO("sm4-ce");
14 MODULE_DESCRIPTION("SM4 symmetric cipher using ARMv8 Crypto Extensions");
15 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
16 MODULE_LICENSE("GPL v2");
17 
18 asmlinkage void sm4_ce_do_crypt(const u32 *rk, void *out, const void *in);
19 
sm4_ce_setkey(struct crypto_tfm * tfm,const u8 * key,unsigned int key_len)20 static 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 
sm4_ce_encrypt(struct crypto_tfm * tfm,u8 * out,const u8 * in)28 static 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 
sm4_ce_decrypt(struct crypto_tfm * tfm,u8 * out,const u8 * in)41 static 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 
54 static struct crypto_alg sm4_ce_alg = {
55 	.cra_name			= "sm4",
56 	.cra_driver_name		= "sm4-ce",
57 	.cra_priority			= 200,
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 
sm4_ce_mod_init(void)71 static int __init sm4_ce_mod_init(void)
72 {
73 	return crypto_register_alg(&sm4_ce_alg);
74 }
75 
sm4_ce_mod_fini(void)76 static void __exit sm4_ce_mod_fini(void)
77 {
78 	crypto_unregister_alg(&sm4_ce_alg);
79 }
80 
81 module_cpu_feature_match(SM4, sm4_ce_mod_init);
82 module_exit(sm4_ce_mod_fini);
83