arch/arm64/crypto/sm3-ce-glue.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * sm3-ce-glue.c - SM3 secure hash using ARMv8.2 Crypto Extensions
   4  *
   5  * Copyright (C) 2018 Linaro Ltd <ard.biesheuvel@linaro.org>
   6  */
   7
   8 #include <asm/neon.h>
   9 #include <asm/simd.h>
  10 #include <asm/unaligned.h>
  11 #include <crypto/internal/hash.h>
  12 #include <crypto/internal/simd.h>
  13 #include <crypto/sm3.h>
  14 #include <crypto/sm3_base.h>
  15 #include <linux/cpufeature.h>
  16 #include <linux/crypto.h>
  17 #include <linux/module.h>
  18
  19 MODULE_DESCRIPTION("SM3 secure hash using ARMv8 Crypto Extensions");
  20 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
  21 MODULE_LICENSE("GPL v2");
  22
  23 asmlinkage void sm3_ce_transform(struct sm3_state *sst, u8 const *src,
  24                                  int blocks);
  25
  26 static int sm3_ce_update(struct shash_desc *desc, const u8 *data,
  27                          unsigned int len)
  28 {
  29         if (!crypto_simd_usable())
  30                 return crypto_sm3_update(desc, data, len);
  31
  32         kernel_neon_begin();
  33         sm3_base_do_update(desc, data, len, sm3_ce_transform);
  34         kernel_neon_end();
  35
  36         return 0;
  37 }
  38
  39 static int sm3_ce_final(struct shash_desc *desc, u8 *out)
  40 {
  41         if (!crypto_simd_usable())
  42                 return crypto_sm3_finup(desc, NULL, 0, out);
  43
  44         kernel_neon_begin();
  45         sm3_base_do_finalize(desc, sm3_ce_transform);
  46         kernel_neon_end();
  47
  48         return sm3_base_finish(desc, out);
  49 }
  50
  51 static int sm3_ce_finup(struct shash_desc *desc, const u8 *data,
  52                         unsigned int len, u8 *out)
  53 {
  54         if (!crypto_simd_usable())
  55                 return crypto_sm3_finup(desc, data, len, out);
  56
  57         kernel_neon_begin();
  58         sm3_base_do_update(desc, data, len, sm3_ce_transform);
  59         kernel_neon_end();
  60
  61         return sm3_ce_final(desc, out);
  62 }
  63
  64 static struct shash_alg sm3_alg = {
  65         .digestsize             = SM3_DIGEST_SIZE,
  66         .init                   = sm3_base_init,
  67         .update                 = sm3_ce_update,
  68         .final                  = sm3_ce_final,
  69         .finup                  = sm3_ce_finup,
  70         .descsize               = sizeof(struct sm3_state),
  71         .base.cra_name          = "sm3",
  72         .base.cra_driver_name   = "sm3-ce",
  73         .base.cra_blocksize     = SM3_BLOCK_SIZE,
  74         .base.cra_module        = THIS_MODULE,
  75         .base.cra_priority      = 200,
  76 };
  77
  78 static int __init sm3_ce_mod_init(void)
  79 {
  80         return crypto_register_shash(&sm3_alg);
  81 }
  82
  83 static void __exit sm3_ce_mod_fini(void)
  84 {
  85         crypto_unregister_shash(&sm3_alg);
  86 }
  87
  88 module_cpu_feature_match(SM3, sm3_ce_mod_init);
  89 module_exit(sm3_ce_mod_fini);