LXR linux/arch/arm/crypto/sha1_neon

   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
  34asmlinkage void sha1_transform_neon(void *state_h, const char *data,
  35                                    unsigned int rounds);
  36
  37static 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
  54static 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
  70static int sha1_neon_final(struct shash_desc *desc, u8 *out)
  71{
  72        return sha1_neon_finup(desc, NULL, 0, out);
  73}
  74
  75static 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
  92static 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
 100static void __exit sha1_neon_mod_fini(void)
 101{
 102        crypto_unregister_shash(&alg);
 103}
 104
 105module_init(sha1_neon_mod_init);
 106module_exit(sha1_neon_mod_fini);
 107
 108MODULE_LICENSE("GPL");
 109MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm, NEON accelerated");
 110MODULE_ALIAS_CRYPTO("sha1");
 111