arch/arm/crypto/sha1-ce-glue.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * sha1-ce-glue.c - SHA-1 secure hash using ARMv8 Crypto Extensions
   4  *
   5  * Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org>
   6  */
   7
   8 #include <crypto/internal/hash.h>
   9 #include <crypto/internal/simd.h>
  10 #include <crypto/sha1.h>
  11 #include <crypto/sha1_base.h>
  12 #include <linux/cpufeature.h>
  13 #include <linux/crypto.h>
  14 #include <linux/module.h>
  15
  16 #include <asm/hwcap.h>
  17 #include <asm/neon.h>
  18 #include <asm/simd.h>
  19
  20 #include "sha1.h"
  21
  22 MODULE_DESCRIPTION("SHA1 secure hash using ARMv8 Crypto Extensions");
  23 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
  24 MODULE_LICENSE("GPL v2");
  25
  26 asmlinkage void sha1_ce_transform(struct sha1_state *sst, u8 const *src,
  27                                   int blocks);
  28
  29 static int sha1_ce_update(struct shash_desc *desc, const u8 *data,
  30                           unsigned int len)
  31 {
  32         struct sha1_state *sctx = shash_desc_ctx(desc);
  33
  34         if (!crypto_simd_usable() ||
  35             (sctx->count % SHA1_BLOCK_SIZE) + len < SHA1_BLOCK_SIZE)
  36                 return sha1_update_arm(desc, data, len);
  37
  38         kernel_neon_begin();
  39         sha1_base_do_update(desc, data, len, sha1_ce_transform);
  40         kernel_neon_end();
  41
  42         return 0;
  43 }
  44
  45 static int sha1_ce_finup(struct shash_desc *desc, const u8 *data,
  46                          unsigned int len, u8 *out)
  47 {
  48         if (!crypto_simd_usable())
  49                 return sha1_finup_arm(desc, data, len, out);
  50
  51         kernel_neon_begin();
  52         if (len)
  53                 sha1_base_do_update(desc, data, len, sha1_ce_transform);
  54         sha1_base_do_finalize(desc, sha1_ce_transform);
  55         kernel_neon_end();
  56
  57         return sha1_base_finish(desc, out);
  58 }
  59
  60 static int sha1_ce_final(struct shash_desc *desc, u8 *out)
  61 {
  62         return sha1_ce_finup(desc, NULL, 0, out);
  63 }
  64
  65 static struct shash_alg alg = {
  66         .init                   = sha1_base_init,
  67         .update                 = sha1_ce_update,
  68         .final                  = sha1_ce_final,
  69         .finup                  = sha1_ce_finup,
  70         .descsize               = sizeof(struct sha1_state),
  71         .digestsize             = SHA1_DIGEST_SIZE,
  72         .base                   = {
  73                 .cra_name               = "sha1",
  74                 .cra_driver_name        = "sha1-ce",
  75                 .cra_priority           = 200,
  76                 .cra_blocksize          = SHA1_BLOCK_SIZE,
  77                 .cra_module             = THIS_MODULE,
  78         }
  79 };
  80
  81 static int __init sha1_ce_mod_init(void)
  82 {
  83         return crypto_register_shash(&alg);
  84 }
  85
  86 static void __exit sha1_ce_mod_fini(void)
  87 {
  88         crypto_unregister_shash(&alg);
  89 }
  90
  91 module_cpu_feature_match(SHA1, sha1_ce_mod_init);
  92 module_exit(sha1_ce_mod_fini);