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                 sm3_update(shash_desc_ctx(desc), data, len);
  31                 return 0;
  32         }
  33
  34         kernel_neon_begin();
  35         sm3_base_do_update(desc, data, len, sm3_ce_transform);
  36         kernel_neon_end();
  37
  38         return 0;
  39 }
  40
  41 static int sm3_ce_final(struct shash_desc *desc, u8 *out)
  42 {
  43         if (!crypto_simd_usable()) {
  44                 sm3_final(shash_desc_ctx(desc), out);
  45                 return 0;
  46         }
  47
  48         kernel_neon_begin();
  49         sm3_base_do_finalize(desc, sm3_ce_transform);
  50         kernel_neon_end();
  51
  52         return sm3_base_finish(desc, out);
  53 }
  54
  55 static int sm3_ce_finup(struct shash_desc *desc, const u8 *data,
  56                         unsigned int len, u8 *out)
  57 {
  58         if (!crypto_simd_usable()) {
  59                 struct sm3_state *sctx = shash_desc_ctx(desc);
  60
  61                 if (len)
  62                         sm3_update(sctx, data, len);
  63                 sm3_final(sctx, out);
  64                 return 0;
  65         }
  66
  67         kernel_neon_begin();
  68         if (len)
  69                 sm3_base_do_update(desc, data, len, sm3_ce_transform);
  70         sm3_base_do_finalize(desc, sm3_ce_transform);
  71         kernel_neon_end();
  72
  73         return sm3_base_finish(desc, out);
  74 }
  75
  76 static struct shash_alg sm3_alg = {
  77         .digestsize             = SM3_DIGEST_SIZE,
  78         .init                   = sm3_base_init,
  79         .update                 = sm3_ce_update,
  80         .final                  = sm3_ce_final,
  81         .finup                  = sm3_ce_finup,
  82         .descsize               = sizeof(struct sm3_state),
  83         .base.cra_name          = "sm3",
  84         .base.cra_driver_name   = "sm3-ce",
  85         .base.cra_blocksize     = SM3_BLOCK_SIZE,
  86         .base.cra_module        = THIS_MODULE,
  87         .base.cra_priority      = 200,
  88 };
  89
  90 static int __init sm3_ce_mod_init(void)
  91 {
  92         return crypto_register_shash(&sm3_alg);
  93 }
  94
  95 static void __exit sm3_ce_mod_fini(void)
  96 {
  97         crypto_unregister_shash(&sm3_alg);
  98 }
  99
 100 module_cpu_feature_match(SM3, sm3_ce_mod_init);
 101 module_exit(sm3_ce_mod_fini);