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

   1 /*
   2  * sm3-ce-glue.c - SM3 secure hash using ARMv8.2 Crypto Extensions
   3  *
   4  * Copyright (C) 2018 Linaro Ltd <ard.biesheuvel@linaro.org>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <asm/neon.h>
  12 #include <asm/simd.h>
  13 #include <asm/unaligned.h>
  14 #include <crypto/internal/hash.h>
  15 #include <crypto/sm3.h>
  16 #include <crypto/sm3_base.h>
  17 #include <linux/cpufeature.h>
  18 #include <linux/crypto.h>
  19 #include <linux/module.h>
  20
  21 MODULE_DESCRIPTION("SM3 secure hash using ARMv8 Crypto Extensions");
  22 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
  23 MODULE_LICENSE("GPL v2");
  24
  25 asmlinkage void sm3_ce_transform(struct sm3_state *sst, u8 const *src,
  26                                  int blocks);
  27
  28 static int sm3_ce_update(struct shash_desc *desc, const u8 *data,
  29                          unsigned int len)
  30 {
  31         if (!may_use_simd())
  32                 return crypto_sm3_update(desc, data, len);
  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 (!may_use_simd())
  44                 return crypto_sm3_finup(desc, NULL, 0, out);
  45
  46         kernel_neon_begin();
  47         sm3_base_do_finalize(desc, sm3_ce_transform);
  48         kernel_neon_end();
  49
  50         return sm3_base_finish(desc, out);
  51 }
  52
  53 static int sm3_ce_finup(struct shash_desc *desc, const u8 *data,
  54                         unsigned int len, u8 *out)
  55 {
  56         if (!may_use_simd())
  57                 return crypto_sm3_finup(desc, data, len, out);
  58
  59         kernel_neon_begin();
  60         sm3_base_do_update(desc, data, len, sm3_ce_transform);
  61         kernel_neon_end();
  62
  63         return sm3_ce_final(desc, out);
  64 }
  65
  66 static struct shash_alg sm3_alg = {
  67         .digestsize             = SM3_DIGEST_SIZE,
  68         .init                   = sm3_base_init,
  69         .update                 = sm3_ce_update,
  70         .final                  = sm3_ce_final,
  71         .finup                  = sm3_ce_finup,
  72         .descsize               = sizeof(struct sm3_state),
  73         .base.cra_name          = "sm3",
  74         .base.cra_driver_name   = "sm3-ce",
  75         .base.cra_flags         = CRYPTO_ALG_TYPE_SHASH,
  76         .base.cra_blocksize     = SM3_BLOCK_SIZE,
  77         .base.cra_module        = THIS_MODULE,
  78         .base.cra_priority      = 200,
  79 };
  80
  81 static int __init sm3_ce_mod_init(void)
  82 {
  83         return crypto_register_shash(&sm3_alg);
  84 }
  85
  86 static void __exit sm3_ce_mod_fini(void)
  87 {
  88         crypto_unregister_shash(&sm3_alg);
  89 }
  90
  91 module_cpu_feature_match(SM3, sm3_ce_mod_init);
  92 module_exit(sm3_ce_mod_fini);