LXR linux/arch/arm/crypto/sha1_neon

   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/cryptohash.h>
  22#include <linux/types.h>
  23#include <crypto/sha.h>
  24#include <crypto/sha1_base.h>
  25#include <asm/neon.h>
  26#include <asm/simd.h>
  27
  28#include "sha1.h"
  29
  30asmlinkage void sha1_transform_neon(void *state_h, const char *data,
  31                                    unsigned int rounds);
  32
  33static int sha1_neon_update(struct shash_desc *desc, const u8 *data,
  34                          unsigned int len)
  35{
  36        struct sha1_state *sctx = shash_desc_ctx(desc);
  37
  38        if (!crypto_simd_usable() ||
  39            (sctx->count % SHA1_BLOCK_SIZE) + len < SHA1_BLOCK_SIZE)
  40                return sha1_update_arm(desc, data, len);
  41
  42        kernel_neon_begin();
  43        sha1_base_do_update(desc, data, len,
  44                            (sha1_block_fn *)sha1_transform_neon);
  45        kernel_neon_end();
  46
  47        return 0;
  48}
  49
  50static int sha1_neon_finup(struct shash_desc *desc, const u8 *data,
  51                           unsigned int len, u8 *out)
  52{
  53        if (!crypto_simd_usable())
  54                return sha1_finup_arm(desc, data, len, out);
  55
  56        kernel_neon_begin();
  57        if (len)
  58                sha1_base_do_update(desc, data, len,
  59                                    (sha1_block_fn *)sha1_transform_neon);
  60        sha1_base_do_finalize(desc, (sha1_block_fn *)sha1_transform_neon);
  61        kernel_neon_end();
  62
  63        return sha1_base_finish(desc, out);
  64}
  65
  66static int sha1_neon_final(struct shash_desc *desc, u8 *out)
  67{
  68        return sha1_neon_finup(desc, NULL, 0, out);
  69}
  70
  71static struct shash_alg alg = {
  72        .digestsize     =       SHA1_DIGEST_SIZE,
  73        .init           =       sha1_base_init,
  74        .update         =       sha1_neon_update,
  75        .final          =       sha1_neon_final,
  76        .finup          =       sha1_neon_finup,
  77        .descsize       =       sizeof(struct sha1_state),
  78        .base           =       {
  79                .cra_name               = "sha1",
  80                .cra_driver_name        = "sha1-neon",
  81                .cra_priority           = 250,
  82                .cra_blocksize          = SHA1_BLOCK_SIZE,
  83                .cra_module             = THIS_MODULE,
  84        }
  85};
  86
  87static int __init sha1_neon_mod_init(void)
  88{
  89        if (!cpu_has_neon())
  90                return -ENODEV;
  91
  92        return crypto_register_shash(&alg);
  93}
  94
  95static void __exit sha1_neon_mod_fini(void)
  96{
  97        crypto_unregister_shash(&alg);
  98}
  99
 100module_init(sha1_neon_mod_init);
 101module_exit(sha1_neon_mod_fini);
 102
 103MODULE_LICENSE("GPL");
 104MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm, NEON accelerated");
 105MODULE_ALIAS_CRYPTO("sha1");
 106