kernel/arch/arm/crypto/sha1_neon_glue.c

   1 /*
   2  * Glue code for the SHA1 Secure Hash Algorithm assembler implementation using
   3  * ARM NEON instructions.
   4  *
   5  * Copyright © 2014 Jussi Kivilinna <jussi.kivilinna@iki.fi>
   6  *
   7  * This file is based on sha1_generic.c and sha1_ssse3_glue.c:
   8  *  Copyright (c) Alan Smithee.
   9  *  Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
  10  *  Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
  11  *  Copyright (c) Mathias Krause <minipli@googlemail.com>
  12  *  Copyright (c) Chandramouli Narayanan <mouli@linux.intel.com>
  13  *
  14  * This program is free software; you can redistribute it and/or modify it
  15  * under the terms of the GNU General Public License as published by the Free
  16  * Software Foundation; either version 2 of the License, or (at your option)
  17  * any later version.
  18  *
  19  */
  20
  21 #include <crypto/internal/hash.h>
  22 #include <linux/init.h>
  23 #include <linux/module.h>
  24 #include <linux/mm.h>
  25 #include <linux/cryptohash.h>
  26 #include <linux/types.h>
  27 #include <crypto/sha.h>
  28 #include <crypto/sha1_base.h>
  29 #include <asm/neon.h>
  30 #include <asm/simd.h>
  31
  32 #include "sha1.h"
  33
  34 asmlinkage void sha1_transform_neon(void *state_h, const char *data,
  35                                     unsigned int rounds);
  36
  37 static int sha1_neon_update(struct shash_desc *desc, const u8 *data,
  38                           unsigned int len)
  39 {
  40         struct sha1_state *sctx = shash_desc_ctx(desc);
  41
  42         if (!may_use_simd() ||
  43             (sctx->count % SHA1_BLOCK_SIZE) + len < SHA1_BLOCK_SIZE)
  44                 return sha1_update_arm(desc, data, len);
  45
  46         kernel_neon_begin();
  47         sha1_base_do_update(desc, data, len,
  48                             (sha1_block_fn *)sha1_transform_neon);
  49         kernel_neon_end();
  50
  51         return 0;
  52 }
  53
  54 static int sha1_neon_finup(struct shash_desc *desc, const u8 *data,
  55                            unsigned int len, u8 *out)
  56 {
  57         if (!may_use_simd())
  58                 return sha1_finup_arm(desc, data, len, out);
  59
  60         kernel_neon_begin();
  61         if (len)
  62                 sha1_base_do_update(desc, data, len,
  63                                     (sha1_block_fn *)sha1_transform_neon);
  64         sha1_base_do_finalize(desc, (sha1_block_fn *)sha1_transform_neon);
  65         kernel_neon_end();
  66
  67         return sha1_base_finish(desc, out);
  68 }
  69
  70 static int sha1_neon_final(struct shash_desc *desc, u8 *out)
  71 {
  72         return sha1_neon_finup(desc, NULL, 0, out);
  73 }
  74
  75 static struct shash_alg alg = {
  76         .digestsize     =       SHA1_DIGEST_SIZE,
  77         .init           =       sha1_base_init,
  78         .update         =       sha1_neon_update,
  79         .final          =       sha1_neon_final,
  80         .finup          =       sha1_neon_finup,
  81         .descsize       =       sizeof(struct sha1_state),
  82         .base           =       {
  83                 .cra_name               = "sha1",
  84                 .cra_driver_name        = "sha1-neon",
  85                 .cra_priority           = 250,
  86                 .cra_flags              = CRYPTO_ALG_TYPE_SHASH,
  87                 .cra_blocksize          = SHA1_BLOCK_SIZE,
  88                 .cra_module             = THIS_MODULE,
  89         }
  90 };
  91
  92 static int __init sha1_neon_mod_init(void)
  93 {
  94         if (!cpu_has_neon())
  95                 return -ENODEV;
  96
  97         return crypto_register_shash(&alg);
  98 }
  99
 100 static void __exit sha1_neon_mod_fini(void)
 101 {
 102         crypto_unregister_shash(&alg);
 103 }
 104
 105 module_init(sha1_neon_mod_init);
 106 module_exit(sha1_neon_mod_fini);
 107
 108 MODULE_LICENSE("GPL");
 109 MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm, NEON accelerated");
 110 MODULE_ALIAS_CRYPTO("sha1");