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/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
  29asmlinkage void sha1_transform_neon(void *state_h, const char *data,
  30                                    unsigned int rounds);
  31
  32static 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
  49static 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
  65static int sha1_neon_final(struct shash_desc *desc, u8 *out)
  66{
  67        return sha1_neon_finup(desc, NULL, 0, out);
  68}
  69
  70static 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
  86static 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
  94static void __exit sha1_neon_mod_fini(void)
  95{
  96        crypto_unregister_shash(&alg);
  97}
  98
  99module_init(sha1_neon_mod_init);
 100module_exit(sha1_neon_mod_fini);
 101
 102MODULE_LICENSE("GPL");
 103MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm, NEON accelerated");
 104MODULE_ALIAS_CRYPTO("sha1");
 105