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 <linux/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 __sha256_ce_transform(struct sha256_ce_state *sst, u8 const *src,
  34                                      int blocks);
  35
  36 static void sha256_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 = __sha256_ce_transform(container_of(sst,
  44                                                          struct sha256_ce_state,
  45                                                          sst), src, blocks);
  46                 kernel_neon_end();
  47                 src += (blocks - rem) * SHA256_BLOCK_SIZE;
  48                 blocks = rem;
  49         }
  50 }
  51
  52 const u32 sha256_ce_offsetof_count = offsetof(struct sha256_ce_state,
  53                                               sst.count);
  54 const u32 sha256_ce_offsetof_finalize = offsetof(struct sha256_ce_state,
  55                                                  finalize);
  56
  57 asmlinkage void sha256_block_data_order(u32 *digest, u8 const *src, int blocks);
  58
  59 static void sha256_arm64_transform(struct sha256_state *sst, u8 const *src,
  60                                    int blocks)
  61 {
  62         sha256_block_data_order(sst->state, src, blocks);
  63 }
  64
  65 static int sha256_ce_update(struct shash_desc *desc, const u8 *data,
  66                             unsigned int len)
  67 {
  68         struct sha256_ce_state *sctx = shash_desc_ctx(desc);
  69
  70         if (!crypto_simd_usable())
  71                 return sha256_base_do_update(desc, data, len,
  72                                              sha256_arm64_transform);
  73
  74         sctx->finalize = 0;
  75         sha256_base_do_update(desc, data, len, sha256_ce_transform);
  76
  77         return 0;
  78 }
  79
  80 static int sha256_ce_finup(struct shash_desc *desc, const u8 *data,
  81                            unsigned int len, u8 *out)
  82 {
  83         struct sha256_ce_state *sctx = shash_desc_ctx(desc);
  84         bool finalize = !sctx->sst.count && !(len % SHA256_BLOCK_SIZE) && len;
  85
  86         if (!crypto_simd_usable()) {
  87                 if (len)
  88                         sha256_base_do_update(desc, data, len,
  89                                               sha256_arm64_transform);
  90                 sha256_base_do_finalize(desc, sha256_arm64_transform);
  91                 return sha256_base_finish(desc, out);
  92         }
  93
  94         /*
  95          * Allow the asm code to perform the finalization if there is no
  96          * partial data and the input is a round multiple of the block size.
  97          */
  98         sctx->finalize = finalize;
  99
 100         sha256_base_do_update(desc, data, len, sha256_ce_transform);
 101         if (!finalize)
 102                 sha256_base_do_finalize(desc, sha256_ce_transform);
 103         return sha256_base_finish(desc, out);
 104 }
 105
 106 static int sha256_ce_final(struct shash_desc *desc, u8 *out)
 107 {
 108         struct sha256_ce_state *sctx = shash_desc_ctx(desc);
 109
 110         if (!crypto_simd_usable()) {
 111                 sha256_base_do_finalize(desc, sha256_arm64_transform);
 112                 return sha256_base_finish(desc, out);
 113         }
 114
 115         sctx->finalize = 0;
 116         sha256_base_do_finalize(desc, sha256_ce_transform);
 117         return sha256_base_finish(desc, out);
 118 }
 119
 120 static int sha256_ce_digest(struct shash_desc *desc, const u8 *data,
 121                             unsigned int len, u8 *out)
 122 {
 123         sha256_base_init(desc);
 124         return sha256_ce_finup(desc, data, len, out);
 125 }
 126
 127 static int sha256_ce_export(struct shash_desc *desc, void *out)
 128 {
 129         struct sha256_ce_state *sctx = shash_desc_ctx(desc);
 130
 131         memcpy(out, &sctx->sst, sizeof(struct sha256_state));
 132         return 0;
 133 }
 134
 135 static int sha256_ce_import(struct shash_desc *desc, const void *in)
 136 {
 137         struct sha256_ce_state *sctx = shash_desc_ctx(desc);
 138
 139         memcpy(&sctx->sst, in, sizeof(struct sha256_state));
 140         sctx->finalize = 0;
 141         return 0;
 142 }
 143
 144 static struct shash_alg algs[] = { {
 145         .init                   = sha224_base_init,
 146         .update                 = sha256_ce_update,
 147         .final                  = sha256_ce_final,
 148         .finup                  = sha256_ce_finup,
 149         .export                 = sha256_ce_export,
 150         .import                 = sha256_ce_import,
 151         .descsize               = sizeof(struct sha256_ce_state),
 152         .statesize              = sizeof(struct sha256_state),
 153         .digestsize             = SHA224_DIGEST_SIZE,
 154         .base                   = {
 155                 .cra_name               = "sha224",
 156                 .cra_driver_name        = "sha224-ce",
 157                 .cra_priority           = 200,
 158                 .cra_blocksize          = SHA256_BLOCK_SIZE,
 159                 .cra_module             = THIS_MODULE,
 160         }
 161 }, {
 162         .init                   = sha256_base_init,
 163         .update                 = sha256_ce_update,
 164         .final                  = sha256_ce_final,
 165         .finup                  = sha256_ce_finup,
 166         .digest                 = sha256_ce_digest,
 167         .export                 = sha256_ce_export,
 168         .import                 = sha256_ce_import,
 169         .descsize               = sizeof(struct sha256_ce_state),
 170         .statesize              = sizeof(struct sha256_state),
 171         .digestsize             = SHA256_DIGEST_SIZE,
 172         .base                   = {
 173                 .cra_name               = "sha256",
 174                 .cra_driver_name        = "sha256-ce",
 175                 .cra_priority           = 200,
 176                 .cra_blocksize          = SHA256_BLOCK_SIZE,
 177                 .cra_module             = THIS_MODULE,
 178         }
 179 } };
 180
 181 static int __init sha2_ce_mod_init(void)
 182 {
 183         return crypto_register_shashes(algs, ARRAY_SIZE(algs));
 184 }
 185
 186 static void __exit sha2_ce_mod_fini(void)
 187 {
 188         crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
 189 }
 190
 191 module_cpu_feature_match(SHA2, sha2_ce_mod_init);
 192 module_exit(sha2_ce_mod_fini);