arch/arm/crypto/sha1_neon_glue.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Glue code for the SHA1 Secure Hash Algorithm assembler implementation using
   4  * ARM NEON instructions.
   5  *
   6  * Copyright © 2014 Jussi Kivilinna <jussi.kivilinna@iki.fi>
   7  *
   8  * This file is based on sha1_generic.c and sha1_ssse3_glue.c:
   9  *  Copyright (c) Alan Smithee.
  10  *  Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
  11  *  Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
  12  *  Copyright (c) Mathias Krause <minipli@googlemail.com>
  13  *  Copyright (c) Chandramouli Narayanan <mouli@linux.intel.com>
  14  */
  15
  16 #include <crypto/internal/hash.h>
  17 #include <crypto/internal/simd.h>
  18 #include <linux/init.h>
  19 #include <linux/module.h>
  20 #include <linux/mm.h>
  21 #include <linux/types.h>
  22 #include <crypto/sha1.h>
  23 #include <crypto/sha1_base.h>
  24 #include <asm/neon.h>
  25 #include <asm/simd.h>
  26
  27 #include "sha1.h"
  28
  29 asmlinkage void sha1_transform_neon(struct sha1_state *state_h,
  30                                     const u8 *data, int rounds);
  31
  32 static int sha1_neon_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_transform_neon);
  43         kernel_neon_end();
  44
  45         return 0;
  46 }
  47
  48 static int sha1_neon_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_transform_neon);
  57         sha1_base_do_finalize(desc, sha1_transform_neon);
  58         kernel_neon_end();
  59
  60         return sha1_base_finish(desc, out);
  61 }
  62
  63 static int sha1_neon_final(struct shash_desc *desc, u8 *out)
  64 {
  65         return sha1_neon_finup(desc, NULL, 0, out);
  66 }
  67
  68 static struct shash_alg alg = {
  69         .digestsize     =       SHA1_DIGEST_SIZE,
  70         .init           =       sha1_base_init,
  71         .update         =       sha1_neon_update,
  72         .final          =       sha1_neon_final,
  73         .finup          =       sha1_neon_finup,
  74         .descsize       =       sizeof(struct sha1_state),
  75         .base           =       {
  76                 .cra_name               = "sha1",
  77                 .cra_driver_name        = "sha1-neon",
  78                 .cra_priority           = 250,
  79                 .cra_blocksize          = SHA1_BLOCK_SIZE,
  80                 .cra_module             = THIS_MODULE,
  81         }
  82 };
  83
  84 static int __init sha1_neon_mod_init(void)
  85 {
  86         if (!cpu_has_neon())
  87                 return -ENODEV;
  88
  89         return crypto_register_shash(&alg);
  90 }
  91
  92 static void __exit sha1_neon_mod_fini(void)
  93 {
  94         crypto_unregister_shash(&alg);
  95 }
  96
  97 module_init(sha1_neon_mod_init);
  98 module_exit(sha1_neon_mod_fini);
  99
 100 MODULE_LICENSE("GPL");
 101 MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm, NEON accelerated");
 102 MODULE_ALIAS_CRYPTO("sha1");