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(void *state_h, const char *data,
  30                                     unsigned 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,
  43                             (sha1_block_fn *)sha1_transform_neon);
  44         kernel_neon_end();
  45
  46         return 0;
  47 }
  48
  49 static int sha1_neon_finup(struct shash_desc *desc, const u8 *data,
  50                            unsigned int len, u8 *out)
  51 {
  52         if (!crypto_simd_usable())
  53                 return sha1_finup_arm(desc, data, len, out);
  54
  55         kernel_neon_begin();
  56         if (len)
  57                 sha1_base_do_update(desc, data, len,
  58                                     (sha1_block_fn *)sha1_transform_neon);
  59         sha1_base_do_finalize(desc, (sha1_block_fn *)sha1_transform_neon);
  60         kernel_neon_end();
  61
  62         return sha1_base_finish(desc, out);
  63 }
  64
  65 static int sha1_neon_final(struct shash_desc *desc, u8 *out)
  66 {
  67         return sha1_neon_finup(desc, NULL, 0, out);
  68 }
  69
  70 static struct shash_alg alg = {
  71         .digestsize     =       SHA1_DIGEST_SIZE,
  72         .init           =       sha1_base_init,
  73         .update         =       sha1_neon_update,
  74         .final          =       sha1_neon_final,
  75         .finup          =       sha1_neon_finup,
  76         .descsize       =       sizeof(struct sha1_state),
  77         .base           =       {
  78                 .cra_name               = "sha1",
  79                 .cra_driver_name        = "sha1-neon",
  80                 .cra_priority           = 250,
  81                 .cra_blocksize          = SHA1_BLOCK_SIZE,
  82                 .cra_module             = THIS_MODULE,
  83         }
  84 };
  85
  86 static int __init sha1_neon_mod_init(void)
  87 {
  88         if (!cpu_has_neon())
  89                 return -ENODEV;
  90
  91         return crypto_register_shash(&alg);
  92 }
  93
  94 static void __exit sha1_neon_mod_fini(void)
  95 {
  96         crypto_unregister_shash(&alg);
  97 }
  98
  99 module_init(sha1_neon_mod_init);
 100 module_exit(sha1_neon_mod_fini);
 101
 102 MODULE_LICENSE("GPL");
 103 MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm, NEON accelerated");
 104 MODULE_ALIAS_CRYPTO("sha1");