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/sha2.h>
  14 #include <crypto/sha256_base.h>
  15 #include <linux/cpufeature.h>
  16 #include <linux/crypto.h>
  17 #include <linux/module.h>
  18
  19 MODULE_DESCRIPTION("SHA-224/SHA-256 secure hash using ARMv8 Crypto Extensions");
  20 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
  21 MODULE_LICENSE("GPL v2");
  22 MODULE_ALIAS_CRYPTO("sha224");
  23 MODULE_ALIAS_CRYPTO("sha256");
  24
  25 struct sha256_ce_state {
  26         struct sha256_state     sst;
  27         u32                     finalize;
  28 };
  29
  30 extern const u32 sha256_ce_offsetof_count;
  31 extern const u32 sha256_ce_offsetof_finalize;
  32
  33 asmlinkage int sha2_ce_transform(struct sha256_ce_state *sst, u8 const *src,
  34                                  int blocks);
  35
  36 static void __sha2_ce_transform(struct sha256_state *sst, u8 const *src,
  37                                 int blocks)
  38 {
  39         while (blocks) {
  40                 int rem;
  41
  42                 kernel_neon_begin();
  43                 rem = sha2_ce_transform(container_of(sst, struct sha256_ce_state,
  44                                                      sst), src, blocks);
  45                 kernel_neon_end();
  46                 src += (blocks - rem) * SHA256_BLOCK_SIZE;
  47                 blocks = rem;
  48         }
  49 }
  50
  51 const u32 sha256_ce_offsetof_count = offsetof(struct sha256_ce_state,
  52                                               sst.count);
  53 const u32 sha256_ce_offsetof_finalize = offsetof(struct sha256_ce_state,
  54                                                  finalize);
  55
  56 asmlinkage void sha256_block_data_order(u32 *digest, u8 const *src, int blocks);
  57
  58 static void __sha256_block_data_order(struct sha256_state *sst, u8 const *src,
  59                                       int blocks)
  60 {
  61         sha256_block_data_order(sst->state, src, blocks);
  62 }
  63
  64 static int sha256_ce_update(struct shash_desc *desc, const u8 *data,
  65                             unsigned int len)
  66 {
  67         struct sha256_ce_state *sctx = shash_desc_ctx(desc);
  68
  69         if (!crypto_simd_usable())
  70                 return sha256_base_do_update(desc, data, len,
  71                                 __sha256_block_data_order);
  72
  73         sctx->finalize = 0;
  74         sha256_base_do_update(desc, data, len, __sha2_ce_transform);
  75
  76         return 0;
  77 }
  78
  79 static int sha256_ce_finup(struct shash_desc *desc, const u8 *data,
  80                            unsigned int len, u8 *out)
  81 {
  82         struct sha256_ce_state *sctx = shash_desc_ctx(desc);
  83         bool finalize = !sctx->sst.count && !(len % SHA256_BLOCK_SIZE) && len;
  84
  85         if (!crypto_simd_usable()) {
  86                 if (len)
  87                         sha256_base_do_update(desc, data, len,
  88                                 __sha256_block_data_order);
  89                 sha256_base_do_finalize(desc, __sha256_block_data_order);
  90                 return sha256_base_finish(desc, out);
  91         }
  92
  93         /*
  94          * Allow the asm code to perform the finalization if there is no
  95          * partial data and the input is a round multiple of the block size.
  96          */
  97         sctx->finalize = finalize;
  98
  99         sha256_base_do_update(desc, data, len, __sha2_ce_transform);
 100         if (!finalize)
 101                 sha256_base_do_finalize(desc, __sha2_ce_transform);
 102         return sha256_base_finish(desc, out);
 103 }
 104
 105 static int sha256_ce_final(struct shash_desc *desc, u8 *out)
 106 {
 107         struct sha256_ce_state *sctx = shash_desc_ctx(desc);
 108
 109         if (!crypto_simd_usable()) {
 110                 sha256_base_do_finalize(desc, __sha256_block_data_order);
 111                 return sha256_base_finish(desc, out);
 112         }
 113
 114         sctx->finalize = 0;
 115         sha256_base_do_finalize(desc, __sha2_ce_transform);
 116         return sha256_base_finish(desc, out);
 117 }
 118
 119 static int sha256_ce_export(struct shash_desc *desc, void *out)
 120 {
 121         struct sha256_ce_state *sctx = shash_desc_ctx(desc);
 122
 123         memcpy(out, &sctx->sst, sizeof(struct sha256_state));
 124         return 0;
 125 }
 126
 127 static int sha256_ce_import(struct shash_desc *desc, const void *in)
 128 {
 129         struct sha256_ce_state *sctx = shash_desc_ctx(desc);
 130
 131         memcpy(&sctx->sst, in, sizeof(struct sha256_state));
 132         sctx->finalize = 0;
 133         return 0;
 134 }
 135
 136 static struct shash_alg algs[] = { {
 137         .init                   = sha224_base_init,
 138         .update                 = sha256_ce_update,
 139         .final                  = sha256_ce_final,
 140         .finup                  = sha256_ce_finup,
 141         .export                 = sha256_ce_export,
 142         .import                 = sha256_ce_import,
 143         .descsize               = sizeof(struct sha256_ce_state),
 144         .statesize              = sizeof(struct sha256_state),
 145         .digestsize             = SHA224_DIGEST_SIZE,
 146         .base                   = {
 147                 .cra_name               = "sha224",
 148                 .cra_driver_name        = "sha224-ce",
 149                 .cra_priority           = 200,
 150                 .cra_blocksize          = SHA256_BLOCK_SIZE,
 151                 .cra_module             = THIS_MODULE,
 152         }
 153 }, {
 154         .init                   = sha256_base_init,
 155         .update                 = sha256_ce_update,
 156         .final                  = sha256_ce_final,
 157         .finup                  = sha256_ce_finup,
 158         .export                 = sha256_ce_export,
 159         .import                 = sha256_ce_import,
 160         .descsize               = sizeof(struct sha256_ce_state),
 161         .statesize              = sizeof(struct sha256_state),
 162         .digestsize             = SHA256_DIGEST_SIZE,
 163         .base                   = {
 164                 .cra_name               = "sha256",
 165                 .cra_driver_name        = "sha256-ce",
 166                 .cra_priority           = 200,
 167                 .cra_blocksize          = SHA256_BLOCK_SIZE,
 168                 .cra_module             = THIS_MODULE,
 169         }
 170 } };
 171
 172 static int __init sha2_ce_mod_init(void)
 173 {
 174         return crypto_register_shashes(algs, ARRAY_SIZE(algs));
 175 }
 176
 177 static void __exit sha2_ce_mod_fini(void)
 178 {
 179         crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
 180 }
 181
 182 module_cpu_feature_match(SHA2, sha2_ce_mod_init);
 183 module_exit(sha2_ce_mod_fini);