linux/arch/arm64/crypto/sha512-ce-glue.c
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   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/internal/simd.h>
  17#include <crypto/sha2.h>
  18#include <crypto/sha512_base.h>
  19#include <linux/cpufeature.h>
  20#include <linux/crypto.h>
  21#include <linux/module.h>
  22
  23MODULE_DESCRIPTION("SHA-384/SHA-512 secure hash using ARMv8 Crypto Extensions");
  24MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
  25MODULE_LICENSE("GPL v2");
  26MODULE_ALIAS_CRYPTO("sha384");
  27MODULE_ALIAS_CRYPTO("sha512");
  28
  29asmlinkage int sha512_ce_transform(struct sha512_state *sst, u8 const *src,
  30                                   int blocks);
  31
  32asmlinkage void sha512_block_data_order(u64 *digest, u8 const *src, int blocks);
  33
  34static void __sha512_ce_transform(struct sha512_state *sst, u8 const *src,
  35                                  int blocks)
  36{
  37        while (blocks) {
  38                int rem;
  39
  40                kernel_neon_begin();
  41                rem = sha512_ce_transform(sst, src, blocks);
  42                kernel_neon_end();
  43                src += (blocks - rem) * SHA512_BLOCK_SIZE;
  44                blocks = rem;
  45        }
  46}
  47
  48static void __sha512_block_data_order(struct sha512_state *sst, u8 const *src,
  49                                      int blocks)
  50{
  51        sha512_block_data_order(sst->state, src, blocks);
  52}
  53
  54static int sha512_ce_update(struct shash_desc *desc, const u8 *data,
  55                            unsigned int len)
  56{
  57        sha512_block_fn *fn = crypto_simd_usable() ? __sha512_ce_transform
  58                                                   : __sha512_block_data_order;
  59
  60        sha512_base_do_update(desc, data, len, fn);
  61        return 0;
  62}
  63
  64static int sha512_ce_finup(struct shash_desc *desc, const u8 *data,
  65                           unsigned int len, u8 *out)
  66{
  67        sha512_block_fn *fn = crypto_simd_usable() ? __sha512_ce_transform
  68                                                   : __sha512_block_data_order;
  69
  70        sha512_base_do_update(desc, data, len, fn);
  71        sha512_base_do_finalize(desc, fn);
  72        return sha512_base_finish(desc, out);
  73}
  74
  75static int sha512_ce_final(struct shash_desc *desc, u8 *out)
  76{
  77        sha512_block_fn *fn = crypto_simd_usable() ? __sha512_ce_transform
  78                                                   : __sha512_block_data_order;
  79
  80        sha512_base_do_finalize(desc, fn);
  81        return sha512_base_finish(desc, out);
  82}
  83
  84static struct shash_alg algs[] = { {
  85        .init                   = sha384_base_init,
  86        .update                 = sha512_ce_update,
  87        .final                  = sha512_ce_final,
  88        .finup                  = sha512_ce_finup,
  89        .descsize               = sizeof(struct sha512_state),
  90        .digestsize             = SHA384_DIGEST_SIZE,
  91        .base.cra_name          = "sha384",
  92        .base.cra_driver_name   = "sha384-ce",
  93        .base.cra_priority      = 200,
  94        .base.cra_blocksize     = SHA512_BLOCK_SIZE,
  95        .base.cra_module        = THIS_MODULE,
  96}, {
  97        .init                   = sha512_base_init,
  98        .update                 = sha512_ce_update,
  99        .final                  = sha512_ce_final,
 100        .finup                  = sha512_ce_finup,
 101        .descsize               = sizeof(struct sha512_state),
 102        .digestsize             = SHA512_DIGEST_SIZE,
 103        .base.cra_name          = "sha512",
 104        .base.cra_driver_name   = "sha512-ce",
 105        .base.cra_priority      = 200,
 106        .base.cra_blocksize     = SHA512_BLOCK_SIZE,
 107        .base.cra_module        = THIS_MODULE,
 108} };
 109
 110static int __init sha512_ce_mod_init(void)
 111{
 112        return crypto_register_shashes(algs, ARRAY_SIZE(algs));
 113}
 114
 115static void __exit sha512_ce_mod_fini(void)
 116{
 117        crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
 118}
 119
 120module_cpu_feature_match(SHA512, sha512_ce_mod_init);
 121module_exit(sha512_ce_mod_fini);
 122
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