1
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
