LXR linux/arch/arm64/crypto/sha2-ce-glue.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * sha2-ce-glue.c - SHA-224/SHA-256 using ARMv8 Crypto Extensions
   4 *
   5 * Copyright (C) 2014 - 2017 Linaro Ltd <ard.biesheuvel@linaro.org>
   6 */
   7
   8#include <asm/neon.h>
   9#include <asm/simd.h>
  10#include <asm/unaligned.h>
  11#include <crypto/internal/hash.h>
  12#include <crypto/internal/simd.h>
  13#include <crypto/sha.h>
  14#include <crypto/sha256_base.h>
  15#include <linux/cpufeature.h>
  16#include <linux/crypto.h>
  17#include <linux/module.h>
  18
  19MODULE_DESCRIPTION("SHA-224/SHA-256 secure hash using ARMv8 Crypto Extensions");
  20MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
  21MODULE_LICENSE("GPL v2");
  22
  23struct sha256_ce_state {
  24        struct sha256_state     sst;
  25        u32                     finalize;
  26};
  27
  28asmlinkage void sha2_ce_transform(struct sha256_ce_state *sst, u8 const *src,
  29                                  int blocks);
  30
  31const u32 sha256_ce_offsetof_count = offsetof(struct sha256_ce_state,
  32                                              sst.count);
  33const u32 sha256_ce_offsetof_finalize = offsetof(struct sha256_ce_state,
  34                                                 finalize);
  35
  36asmlinkage void sha256_block_data_order(u32 *digest, u8 const *src, int blocks);
  37
  38static int sha256_ce_update(struct shash_desc *desc, const u8 *data,
  39                            unsigned int len)
  40{
  41        struct sha256_ce_state *sctx = shash_desc_ctx(desc);
  42
  43        if (!crypto_simd_usable())
  44                return sha256_base_do_update(desc, data, len,
  45                                (sha256_block_fn *)sha256_block_data_order);
  46
  47        sctx->finalize = 0;
  48        kernel_neon_begin();
  49        sha256_base_do_update(desc, data, len,
  50                              (sha256_block_fn *)sha2_ce_transform);
  51        kernel_neon_end();
  52
  53        return 0;
  54}
  55
  56static int sha256_ce_finup(struct shash_desc *desc, const u8 *data,
  57                           unsigned int len, u8 *out)
  58{
  59        struct sha256_ce_state *sctx = shash_desc_ctx(desc);
  60        bool finalize = !sctx->sst.count && !(len % SHA256_BLOCK_SIZE) && len;
  61
  62        if (!crypto_simd_usable()) {
  63                if (len)
  64                        sha256_base_do_update(desc, data, len,
  65                                (sha256_block_fn *)sha256_block_data_order);
  66                sha256_base_do_finalize(desc,
  67                                (sha256_block_fn *)sha256_block_data_order);
  68                return sha256_base_finish(desc, out);
  69        }
  70
  71        /*
  72         * Allow the asm code to perform the finalization if there is no
  73         * partial data and the input is a round multiple of the block size.
  74         */
  75        sctx->finalize = finalize;
  76
  77        kernel_neon_begin();
  78        sha256_base_do_update(desc, data, len,
  79                              (sha256_block_fn *)sha2_ce_transform);
  80        if (!finalize)
  81                sha256_base_do_finalize(desc,
  82                                        (sha256_block_fn *)sha2_ce_transform);
  83        kernel_neon_end();
  84        return sha256_base_finish(desc, out);
  85}
  86
  87static int sha256_ce_final(struct shash_desc *desc, u8 *out)
  88{
  89        struct sha256_ce_state *sctx = shash_desc_ctx(desc);
  90
  91        if (!crypto_simd_usable()) {
  92                sha256_base_do_finalize(desc,
  93                                (sha256_block_fn *)sha256_block_data_order);
  94                return sha256_base_finish(desc, out);
  95        }
  96
  97        sctx->finalize = 0;
  98        kernel_neon_begin();
  99        sha256_base_do_finalize(desc, (sha256_block_fn *)sha2_ce_transform);
 100        kernel_neon_end();
 101        return sha256_base_finish(desc, out);
 102}
 103
 104static struct shash_alg algs[] = { {
 105        .init                   = sha224_base_init,
 106        .update                 = sha256_ce_update,
 107        .final                  = sha256_ce_final,
 108        .finup                  = sha256_ce_finup,
 109        .descsize               = sizeof(struct sha256_ce_state),
 110        .digestsize             = SHA224_DIGEST_SIZE,
 111        .base                   = {
 112                .cra_name               = "sha224",
 113                .cra_driver_name        = "sha224-ce",
 114                .cra_priority           = 200,
 115                .cra_blocksize          = SHA256_BLOCK_SIZE,
 116                .cra_module             = THIS_MODULE,
 117        }
 118}, {
 119        .init                   = sha256_base_init,
 120        .update                 = sha256_ce_update,
 121        .final                  = sha256_ce_final,
 122        .finup                  = sha256_ce_finup,
 123        .descsize               = sizeof(struct sha256_ce_state),
 124        .digestsize             = SHA256_DIGEST_SIZE,
 125        .base                   = {
 126                .cra_name               = "sha256",
 127                .cra_driver_name        = "sha256-ce",
 128                .cra_priority           = 200,
 129                .cra_blocksize          = SHA256_BLOCK_SIZE,
 130                .cra_module             = THIS_MODULE,
 131        }
 132} };
 133
 134static int __init sha2_ce_mod_init(void)
 135{
 136        return crypto_register_shashes(algs, ARRAY_SIZE(algs));
 137}
 138
 139static void __exit sha2_ce_mod_fini(void)
 140{
 141        crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
 142}
 143
 144module_cpu_feature_match(SHA2, sha2_ce_mod_init);
 145module_exit(sha2_ce_mod_fini);
 146