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