LXR linux/arch/arm/crypto/sha1-ce-glue.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * sha1-ce-glue.c - SHA-1 secure hash using ARMv8 Crypto Extensions
   4 *
   5 * Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org>
   6 */
   7
   8#include <crypto/internal/hash.h>
   9#include <crypto/internal/simd.h>
  10#include <crypto/sha1.h>
  11#include <crypto/sha1_base.h>
  12#include <linux/cpufeature.h>
  13#include <linux/crypto.h>
  14#include <linux/module.h>
  15
  16#include <asm/hwcap.h>
  17#include <asm/neon.h>
  18#include <asm/simd.h>
  19
  20#include "sha1.h"
  21
  22MODULE_DESCRIPTION("SHA1 secure hash using ARMv8 Crypto Extensions");
  23MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
  24MODULE_LICENSE("GPL v2");
  25
  26asmlinkage void sha1_ce_transform(struct sha1_state *sst, u8 const *src,
  27                                  int blocks);
  28
  29static int sha1_ce_update(struct shash_desc *desc, const u8 *data,
  30                          unsigned int len)
  31{
  32        struct sha1_state *sctx = shash_desc_ctx(desc);
  33
  34        if (!crypto_simd_usable() ||
  35            (sctx->count % SHA1_BLOCK_SIZE) + len < SHA1_BLOCK_SIZE)
  36                return sha1_update_arm(desc, data, len);
  37
  38        kernel_neon_begin();
  39        sha1_base_do_update(desc, data, len, sha1_ce_transform);
  40        kernel_neon_end();
  41
  42        return 0;
  43}
  44
  45static int sha1_ce_finup(struct shash_desc *desc, const u8 *data,
  46                         unsigned int len, u8 *out)
  47{
  48        if (!crypto_simd_usable())
  49                return sha1_finup_arm(desc, data, len, out);
  50
  51        kernel_neon_begin();
  52        if (len)
  53                sha1_base_do_update(desc, data, len, sha1_ce_transform);
  54        sha1_base_do_finalize(desc, sha1_ce_transform);
  55        kernel_neon_end();
  56
  57        return sha1_base_finish(desc, out);
  58}
  59
  60static int sha1_ce_final(struct shash_desc *desc, u8 *out)
  61{
  62        return sha1_ce_finup(desc, NULL, 0, out);
  63}
  64
  65static struct shash_alg alg = {
  66        .init                   = sha1_base_init,
  67        .update                 = sha1_ce_update,
  68        .final                  = sha1_ce_final,
  69        .finup                  = sha1_ce_finup,
  70        .descsize               = sizeof(struct sha1_state),
  71        .digestsize             = SHA1_DIGEST_SIZE,
  72        .base                   = {
  73                .cra_name               = "sha1",
  74                .cra_driver_name        = "sha1-ce",
  75                .cra_priority           = 200,
  76                .cra_blocksize          = SHA1_BLOCK_SIZE,
  77                .cra_module             = THIS_MODULE,
  78        }
  79};
  80
  81static int __init sha1_ce_mod_init(void)
  82{
  83        return crypto_register_shash(&alg);
  84}
  85
  86static void __exit sha1_ce_mod_fini(void)
  87{
  88        crypto_unregister_shash(&alg);
  89}
  90
  91module_cpu_feature_match(SHA1, sha1_ce_mod_init);
  92module_exit(sha1_ce_mod_fini);
  93