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

   1 /*
   2  * sha1-ce-glue.c - SHA-1 secure hash using ARMv8 Crypto Extensions
   3  *
   4  * Copyright (C) 2015 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 <crypto/internal/hash.h>
  12 #include <crypto/internal/simd.h>
  13 #include <crypto/sha.h>
  14 #include <crypto/sha1_base.h>
  15 #include <linux/cpufeature.h>
  16 #include <linux/crypto.h>
  17 #include <linux/module.h>
  18
  19 #include <asm/hwcap.h>
  20 #include <asm/neon.h>
  21 #include <asm/simd.h>
  22
  23 #include "sha1.h"
  24
  25 MODULE_DESCRIPTION("SHA1 secure hash using ARMv8 Crypto Extensions");
  26 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
  27 MODULE_LICENSE("GPL v2");
  28
  29 asmlinkage void sha1_ce_transform(struct sha1_state *sst, u8 const *src,
  30                                   int blocks);
  31
  32 static int sha1_ce_update(struct shash_desc *desc, const u8 *data,
  33                           unsigned int len)
  34 {
  35         struct sha1_state *sctx = shash_desc_ctx(desc);
  36
  37         if (!crypto_simd_usable() ||
  38             (sctx->count % SHA1_BLOCK_SIZE) + len < SHA1_BLOCK_SIZE)
  39                 return sha1_update_arm(desc, data, len);
  40
  41         kernel_neon_begin();
  42         sha1_base_do_update(desc, data, len, sha1_ce_transform);
  43         kernel_neon_end();
  44
  45         return 0;
  46 }
  47
  48 static int sha1_ce_finup(struct shash_desc *desc, const u8 *data,
  49                          unsigned int len, u8 *out)
  50 {
  51         if (!crypto_simd_usable())
  52                 return sha1_finup_arm(desc, data, len, out);
  53
  54         kernel_neon_begin();
  55         if (len)
  56                 sha1_base_do_update(desc, data, len, sha1_ce_transform);
  57         sha1_base_do_finalize(desc, sha1_ce_transform);
  58         kernel_neon_end();
  59
  60         return sha1_base_finish(desc, out);
  61 }
  62
  63 static int sha1_ce_final(struct shash_desc *desc, u8 *out)
  64 {
  65         return sha1_ce_finup(desc, NULL, 0, out);
  66 }
  67
  68 static struct shash_alg alg = {
  69         .init                   = sha1_base_init,
  70         .update                 = sha1_ce_update,
  71         .final                  = sha1_ce_final,
  72         .finup                  = sha1_ce_finup,
  73         .descsize               = sizeof(struct sha1_state),
  74         .digestsize             = SHA1_DIGEST_SIZE,
  75         .base                   = {
  76                 .cra_name               = "sha1",
  77                 .cra_driver_name        = "sha1-ce",
  78                 .cra_priority           = 200,
  79                 .cra_blocksize          = SHA1_BLOCK_SIZE,
  80                 .cra_module             = THIS_MODULE,
  81         }
  82 };
  83
  84 static int __init sha1_ce_mod_init(void)
  85 {
  86         return crypto_register_shash(&alg);
  87 }
  88
  89 static void __exit sha1_ce_mod_fini(void)
  90 {
  91         crypto_unregister_shash(&alg);
  92 }
  93
  94 module_cpu_feature_match(SHA1, sha1_ce_mod_init);
  95 module_exit(sha1_ce_mod_fini);