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 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
  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
  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
  71 static int __init sm4_ce_mod_init(void)
  72 {
  73         return crypto_register_alg(&sm4_ce_alg);
  74 }
  75
  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);