arch/arm64/crypto/sm4-ce-glue.c

   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 <linux/module.h>
   7 #include <linux/cpufeature.h>
   8 #include <linux/crypto.h>
   9 #include <linux/types.h>
  10
  11 MODULE_ALIAS_CRYPTO("sm4");
  12 MODULE_ALIAS_CRYPTO("sm4-ce");
  13 MODULE_DESCRIPTION("SM4 symmetric cipher using ARMv8 Crypto Extensions");
  14 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
  15 MODULE_LICENSE("GPL v2");
  16
  17 asmlinkage void sm4_ce_do_crypt(const u32 *rk, void *out, const void *in);
  18
  19 static 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
  32 static 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
  45 static 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
  62 static int __init sm4_ce_mod_init(void)
  63 {
  64         return crypto_register_alg(&sm4_ce_alg);
  65 }
  66
  67 static void __exit sm4_ce_mod_fini(void)
  68 {
  69         crypto_unregister_alg(&sm4_ce_alg);
  70 }
  71
  72 module_cpu_feature_match(SM3, sm4_ce_mod_init);
  73 module_exit(sm4_ce_mod_fini);