LXR linux/arch/arm64/crypto/sha1-ce-glue.c

   1/*
   2 * sha1-ce-glue.c - SHA-1 secure hash using ARMv8 Crypto Extensions
   3 *
   4 * Copyright (C) 2014 - 2017 Linaro Ltd <ard.biesheuvel@linaro.org>
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License version 2 as
   8 * published by the Free Software Foundation.
   9 */
  10
  11#include <asm/neon.h>
  12#include <asm/simd.h>
  13#include <asm/unaligned.h>
  14#include <crypto/internal/hash.h>
  15#include <crypto/sha.h>
  16#include <crypto/sha1_base.h>
  17#include <linux/cpufeature.h>
  18#include <linux/crypto.h>
  19#include <linux/module.h>
  20
  21MODULE_DESCRIPTION("SHA1 secure hash using ARMv8 Crypto Extensions");
  22MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
  23MODULE_LICENSE("GPL v2");
  24
  25struct sha1_ce_state {
  26        struct sha1_state       sst;
  27        u32                     finalize;
  28};
  29
  30asmlinkage void sha1_ce_transform(struct sha1_ce_state *sst, u8 const *src,
  31                                  int blocks);
  32
  33const u32 sha1_ce_offsetof_count = offsetof(struct sha1_ce_state, sst.count);
  34const u32 sha1_ce_offsetof_finalize = offsetof(struct sha1_ce_state, finalize);
  35
  36static int sha1_ce_update(struct shash_desc *desc, const u8 *data,
  37                          unsigned int len)
  38{
  39        struct sha1_ce_state *sctx = shash_desc_ctx(desc);
  40
  41        if (!may_use_simd())
  42                return crypto_sha1_update(desc, data, len);
  43
  44        sctx->finalize = 0;
  45        kernel_neon_begin();
  46        sha1_base_do_update(desc, data, len,
  47                            (sha1_block_fn *)sha1_ce_transform);
  48        kernel_neon_end();
  49
  50        return 0;
  51}
  52
  53static int sha1_ce_finup(struct shash_desc *desc, const u8 *data,
  54                         unsigned int len, u8 *out)
  55{
  56        struct sha1_ce_state *sctx = shash_desc_ctx(desc);
  57        bool finalize = !sctx->sst.count && !(len % SHA1_BLOCK_SIZE);
  58
  59        if (!may_use_simd())
  60                return crypto_sha1_finup(desc, data, len, out);
  61
  62        /*
  63         * Allow the asm code to perform the finalization if there is no
  64         * partial data and the input is a round multiple of the block size.
  65         */
  66        sctx->finalize = finalize;
  67
  68        kernel_neon_begin();
  69        sha1_base_do_update(desc, data, len,
  70                            (sha1_block_fn *)sha1_ce_transform);
  71        if (!finalize)
  72                sha1_base_do_finalize(desc, (sha1_block_fn *)sha1_ce_transform);
  73        kernel_neon_end();
  74        return sha1_base_finish(desc, out);
  75}
  76
  77static int sha1_ce_final(struct shash_desc *desc, u8 *out)
  78{
  79        struct sha1_ce_state *sctx = shash_desc_ctx(desc);
  80
  81        if (!may_use_simd())
  82                return crypto_sha1_finup(desc, NULL, 0, out);
  83
  84        sctx->finalize = 0;
  85        kernel_neon_begin();
  86        sha1_base_do_finalize(desc, (sha1_block_fn *)sha1_ce_transform);
  87        kernel_neon_end();
  88        return sha1_base_finish(desc, out);
  89}
  90
  91static struct shash_alg alg = {
  92        .init                   = sha1_base_init,
  93        .update                 = sha1_ce_update,
  94        .final                  = sha1_ce_final,
  95        .finup                  = sha1_ce_finup,
  96        .descsize               = sizeof(struct sha1_ce_state),
  97        .digestsize             = SHA1_DIGEST_SIZE,
  98        .base                   = {
  99                .cra_name               = "sha1",
 100                .cra_driver_name        = "sha1-ce",
 101                .cra_priority           = 200,
 102                .cra_flags              = CRYPTO_ALG_TYPE_SHASH,
 103                .cra_blocksize          = SHA1_BLOCK_SIZE,
 104                .cra_module             = THIS_MODULE,
 105        }
 106};
 107
 108static int __init sha1_ce_mod_init(void)
 109{
 110        return crypto_register_shash(&alg);
 111}
 112
 113static void __exit sha1_ce_mod_fini(void)
 114{
 115        crypto_unregister_shash(&alg);
 116}
 117
 118module_cpu_feature_match(SHA1, sha1_ce_mod_init);
 119module_exit(sha1_ce_mod_fini);
 120