arch/arm64/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) 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/sha1.h>
  14 #include <crypto/sha1_base.h>
  15 #include <linux/cpufeature.h>
  16 #include <linux/crypto.h>
  17 #include <linux/module.h>
  18
  19 MODULE_DESCRIPTION("SHA1 secure hash using ARMv8 Crypto Extensions");
  20 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
  21 MODULE_LICENSE("GPL v2");
  22 MODULE_ALIAS_CRYPTO("sha1");
  23
  24 struct sha1_ce_state {
  25         struct sha1_state       sst;
  26         u32                     finalize;
  27 };
  28
  29 extern const u32 sha1_ce_offsetof_count;
  30 extern const u32 sha1_ce_offsetof_finalize;
  31
  32 asmlinkage int sha1_ce_transform(struct sha1_ce_state *sst, u8 const *src,
  33                                  int blocks);
  34
  35 static void __sha1_ce_transform(struct sha1_state *sst, u8 const *src,
  36                                 int blocks)
  37 {
  38         while (blocks) {
  39                 int rem;
  40
  41                 kernel_neon_begin();
  42                 rem = sha1_ce_transform(container_of(sst, struct sha1_ce_state,
  43                                                      sst), src, blocks);
  44                 kernel_neon_end();
  45                 src += (blocks - rem) * SHA1_BLOCK_SIZE;
  46                 blocks = rem;
  47         }
  48 }
  49
  50 const u32 sha1_ce_offsetof_count = offsetof(struct sha1_ce_state, sst.count);
  51 const u32 sha1_ce_offsetof_finalize = offsetof(struct sha1_ce_state, finalize);
  52
  53 static int sha1_ce_update(struct shash_desc *desc, const u8 *data,
  54                           unsigned int len)
  55 {
  56         struct sha1_ce_state *sctx = shash_desc_ctx(desc);
  57
  58         if (!crypto_simd_usable())
  59                 return crypto_sha1_update(desc, data, len);
  60
  61         sctx->finalize = 0;
  62         sha1_base_do_update(desc, data, len, __sha1_ce_transform);
  63
  64         return 0;
  65 }
  66
  67 static int sha1_ce_finup(struct shash_desc *desc, const u8 *data,
  68                          unsigned int len, u8 *out)
  69 {
  70         struct sha1_ce_state *sctx = shash_desc_ctx(desc);
  71         bool finalize = !sctx->sst.count && !(len % SHA1_BLOCK_SIZE) && len;
  72
  73         if (!crypto_simd_usable())
  74                 return crypto_sha1_finup(desc, data, len, out);
  75
  76         /*
  77          * Allow the asm code to perform the finalization if there is no
  78          * partial data and the input is a round multiple of the block size.
  79          */
  80         sctx->finalize = finalize;
  81
  82         sha1_base_do_update(desc, data, len, __sha1_ce_transform);
  83         if (!finalize)
  84                 sha1_base_do_finalize(desc, __sha1_ce_transform);
  85         return sha1_base_finish(desc, out);
  86 }
  87
  88 static int sha1_ce_final(struct shash_desc *desc, u8 *out)
  89 {
  90         struct sha1_ce_state *sctx = shash_desc_ctx(desc);
  91
  92         if (!crypto_simd_usable())
  93                 return crypto_sha1_finup(desc, NULL, 0, out);
  94
  95         sctx->finalize = 0;
  96         sha1_base_do_finalize(desc, __sha1_ce_transform);
  97         return sha1_base_finish(desc, out);
  98 }
  99
 100 static int sha1_ce_export(struct shash_desc *desc, void *out)
 101 {
 102         struct sha1_ce_state *sctx = shash_desc_ctx(desc);
 103
 104         memcpy(out, &sctx->sst, sizeof(struct sha1_state));
 105         return 0;
 106 }
 107
 108 static int sha1_ce_import(struct shash_desc *desc, const void *in)
 109 {
 110         struct sha1_ce_state *sctx = shash_desc_ctx(desc);
 111
 112         memcpy(&sctx->sst, in, sizeof(struct sha1_state));
 113         sctx->finalize = 0;
 114         return 0;
 115 }
 116
 117 static struct shash_alg alg = {
 118         .init                   = sha1_base_init,
 119         .update                 = sha1_ce_update,
 120         .final                  = sha1_ce_final,
 121         .finup                  = sha1_ce_finup,
 122         .import                 = sha1_ce_import,
 123         .export                 = sha1_ce_export,
 124         .descsize               = sizeof(struct sha1_ce_state),
 125         .statesize              = sizeof(struct sha1_state),
 126         .digestsize             = SHA1_DIGEST_SIZE,
 127         .base                   = {
 128                 .cra_name               = "sha1",
 129                 .cra_driver_name        = "sha1-ce",
 130                 .cra_priority           = 200,
 131                 .cra_blocksize          = SHA1_BLOCK_SIZE,
 132                 .cra_module             = THIS_MODULE,
 133         }
 134 };
 135
 136 static int __init sha1_ce_mod_init(void)
 137 {
 138         return crypto_register_shash(&alg);
 139 }
 140
 141 static void __exit sha1_ce_mod_fini(void)
 142 {
 143         crypto_unregister_shash(&alg);
 144 }
 145
 146 module_cpu_feature_match(SHA1, sha1_ce_mod_init);
 147 module_exit(sha1_ce_mod_fini);