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 <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
  20 static 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
  33 static 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
  46 static 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
  63 static int __init sm4_ce_mod_init(void)
  64 {
  65         return crypto_register_alg(&sm4_ce_alg);
  66 }
  67
  68 static void __exit sm4_ce_mod_fini(void)
  69 {
  70         crypto_unregister_alg(&sm4_ce_alg);
  71 }
  72
  73 module_cpu_feature_match(SM4, sm4_ce_mod_init);
  74 module_exit(sm4_ce_mod_fini);