1
2
3#include <asm/neon.h>
4#include <asm/simd.h>
5#include <crypto/sm4.h>
6#include <linux/module.h>
7#include <linux/cpufeature.h>
8#include <linux/crypto.h>
9#include <linux/types.h>
10
11MODULE_ALIAS_CRYPTO("sm4");
12MODULE_ALIAS_CRYPTO("sm4-ce");
13MODULE_DESCRIPTION("SM4 symmetric cipher using ARMv8 Crypto Extensions");
14MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
15MODULE_LICENSE("GPL v2");
16
17asmlinkage void sm4_ce_do_crypt(const u32 *rk, void *out, const void *in);
18
19static void sm4_ce_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
20{
21 const struct crypto_sm4_ctx *ctx = crypto_tfm_ctx(tfm);
22
23 if (!may_use_simd()) {
24 crypto_sm4_encrypt(tfm, out, in);
25 } else {
26 kernel_neon_begin();
27 sm4_ce_do_crypt(ctx->rkey_enc, out, in);
28 kernel_neon_end();
29 }
30}
31
32static void sm4_ce_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
33{
34 const struct crypto_sm4_ctx *ctx = crypto_tfm_ctx(tfm);
35
36 if (!may_use_simd()) {
37 crypto_sm4_decrypt(tfm, out, in);
38 } else {
39 kernel_neon_begin();
40 sm4_ce_do_crypt(ctx->rkey_dec, out, in);
41 kernel_neon_end();
42 }
43}
44
45static struct crypto_alg sm4_ce_alg = {
46 .cra_name = "sm4",
47 .cra_driver_name = "sm4-ce",
48 .cra_priority = 200,
49 .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
50 .cra_blocksize = SM4_BLOCK_SIZE,
51 .cra_ctxsize = sizeof(struct crypto_sm4_ctx),
52 .cra_module = THIS_MODULE,
53 .cra_u.cipher = {
54 .cia_min_keysize = SM4_KEY_SIZE,
55 .cia_max_keysize = SM4_KEY_SIZE,
56 .cia_setkey = crypto_sm4_set_key,
57 .cia_encrypt = sm4_ce_encrypt,
58 .cia_decrypt = sm4_ce_decrypt
59 }
60};
61
62static int __init sm4_ce_mod_init(void)
63{
64 return crypto_register_alg(&sm4_ce_alg);
65}
66
67static void __exit sm4_ce_mod_fini(void)
68{
69 crypto_unregister_alg(&sm4_ce_alg);
70}
71
72module_cpu_feature_match(SM4, sm4_ce_mod_init);
73module_exit(sm4_ce_mod_fini);
74
