LXR linux/arch/arm64/crypto/sha512-ce-glue.c

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 * sha512-ce-glue.c - SHA-384/SHA-512 using ARMv8 Crypto Extensions
   4 *
   5 * Copyright (C) 2018 Linaro Ltd <ard.biesheuvel@linaro.org>
   6 *
   7 * This program is free software; you can redistribute it and/or modify
   8 * it under the terms of the GNU General Public License version 2 as
   9 * published by the Free Software Foundation.
  10 */
  11
  12#include <asm/neon.h>
  13#include <asm/simd.h>
  14#include <asm/unaligned.h>
  15#include <crypto/internal/hash.h>
  16#include <crypto/sha.h>
  17#include <crypto/sha512_base.h>
  18#include <linux/cpufeature.h>
  19#include <linux/crypto.h>
  20#include <linux/module.h>
  21
  22MODULE_DESCRIPTION("SHA-384/SHA-512 secure hash using ARMv8 Crypto Extensions");
  23MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
  24MODULE_LICENSE("GPL v2");
  25
  26asmlinkage void sha512_ce_transform(struct sha512_state *sst, u8 const *src,
  27                                    int blocks);
  28
  29asmlinkage void sha512_block_data_order(u64 *digest, u8 const *src, int blocks);
  30
  31static int sha512_ce_update(struct shash_desc *desc, const u8 *data,
  32                            unsigned int len)
  33{
  34        if (!may_use_simd())
  35                return sha512_base_do_update(desc, data, len,
  36                                (sha512_block_fn *)sha512_block_data_order);
  37
  38        kernel_neon_begin();
  39        sha512_base_do_update(desc, data, len,
  40                              (sha512_block_fn *)sha512_ce_transform);
  41        kernel_neon_end();
  42
  43        return 0;
  44}
  45
  46static int sha512_ce_finup(struct shash_desc *desc, const u8 *data,
  47                           unsigned int len, u8 *out)
  48{
  49        if (!may_use_simd()) {
  50                if (len)
  51                        sha512_base_do_update(desc, data, len,
  52                                (sha512_block_fn *)sha512_block_data_order);
  53                sha512_base_do_finalize(desc,
  54                                (sha512_block_fn *)sha512_block_data_order);
  55                return sha512_base_finish(desc, out);
  56        }
  57
  58        kernel_neon_begin();
  59        sha512_base_do_update(desc, data, len,
  60                              (sha512_block_fn *)sha512_ce_transform);
  61        sha512_base_do_finalize(desc, (sha512_block_fn *)sha512_ce_transform);
  62        kernel_neon_end();
  63        return sha512_base_finish(desc, out);
  64}
  65
  66static int sha512_ce_final(struct shash_desc *desc, u8 *out)
  67{
  68        if (!may_use_simd()) {
  69                sha512_base_do_finalize(desc,
  70                                (sha512_block_fn *)sha512_block_data_order);
  71                return sha512_base_finish(desc, out);
  72        }
  73
  74        kernel_neon_begin();
  75        sha512_base_do_finalize(desc, (sha512_block_fn *)sha512_ce_transform);
  76        kernel_neon_end();
  77        return sha512_base_finish(desc, out);
  78}
  79
  80static struct shash_alg algs[] = { {
  81        .init                   = sha384_base_init,
  82        .update                 = sha512_ce_update,
  83        .final                  = sha512_ce_final,
  84        .finup                  = sha512_ce_finup,
  85        .descsize               = sizeof(struct sha512_state),
  86        .digestsize             = SHA384_DIGEST_SIZE,
  87        .base.cra_name          = "sha384",
  88        .base.cra_driver_name   = "sha384-ce",
  89        .base.cra_priority      = 200,
  90        .base.cra_flags         = CRYPTO_ALG_TYPE_SHASH,
  91        .base.cra_blocksize     = SHA512_BLOCK_SIZE,
  92        .base.cra_module        = THIS_MODULE,
  93}, {
  94        .init                   = sha512_base_init,
  95        .update                 = sha512_ce_update,
  96        .final                  = sha512_ce_final,
  97        .finup                  = sha512_ce_finup,
  98        .descsize               = sizeof(struct sha512_state),
  99        .digestsize             = SHA512_DIGEST_SIZE,
 100        .base.cra_name          = "sha512",
 101        .base.cra_driver_name   = "sha512-ce",
 102        .base.cra_priority      = 200,
 103        .base.cra_flags         = CRYPTO_ALG_TYPE_SHASH,
 104        .base.cra_blocksize     = SHA512_BLOCK_SIZE,
 105        .base.cra_module        = THIS_MODULE,
 106} };
 107
 108static int __init sha512_ce_mod_init(void)
 109{
 110        return crypto_register_shashes(algs, ARRAY_SIZE(algs));
 111}
 112
 113static void __exit sha512_ce_mod_fini(void)
 114{
 115        crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
 116}
 117
 118module_cpu_feature_match(SHA512, sha512_ce_mod_init);
 119module_exit(sha512_ce_mod_fini);
 120