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 <linux/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,
  43                                                        struct sha1_ce_state,
  44                                                        sst), src, blocks);
  45                 kernel_neon_end();
  46                 src += (blocks - rem) * SHA1_BLOCK_SIZE;
  47                 blocks = rem;
  48         }
  49 }
  50
  51 const u32 sha1_ce_offsetof_count = offsetof(struct sha1_ce_state, sst.count);
  52 const u32 sha1_ce_offsetof_finalize = offsetof(struct sha1_ce_state, finalize);
  53
  54 static int sha1_ce_update(struct shash_desc *desc, const u8 *data,
  55                           unsigned int len)
  56 {
  57         struct sha1_ce_state *sctx = shash_desc_ctx(desc);
  58
  59         if (!crypto_simd_usable())
  60                 return crypto_sha1_update(desc, data, len);
  61
  62         sctx->finalize = 0;
  63         sha1_base_do_update(desc, data, len, sha1_ce_transform);
  64
  65         return 0;
  66 }
  67
  68 static int sha1_ce_finup(struct shash_desc *desc, const u8 *data,
  69                          unsigned int len, u8 *out)
  70 {
  71         struct sha1_ce_state *sctx = shash_desc_ctx(desc);
  72         bool finalize = !sctx->sst.count && !(len % SHA1_BLOCK_SIZE) && len;
  73
  74         if (!crypto_simd_usable())
  75                 return crypto_sha1_finup(desc, data, len, out);
  76
  77         /*
  78          * Allow the asm code to perform the finalization if there is no
  79          * partial data and the input is a round multiple of the block size.
  80          */
  81         sctx->finalize = finalize;
  82
  83         sha1_base_do_update(desc, data, len, sha1_ce_transform);
  84         if (!finalize)
  85                 sha1_base_do_finalize(desc, sha1_ce_transform);
  86         return sha1_base_finish(desc, out);
  87 }
  88
  89 static int sha1_ce_final(struct shash_desc *desc, u8 *out)
  90 {
  91         struct sha1_ce_state *sctx = shash_desc_ctx(desc);
  92
  93         if (!crypto_simd_usable())
  94                 return crypto_sha1_finup(desc, NULL, 0, out);
  95
  96         sctx->finalize = 0;
  97         sha1_base_do_finalize(desc, sha1_ce_transform);
  98         return sha1_base_finish(desc, out);
  99 }
 100
 101 static int sha1_ce_export(struct shash_desc *desc, void *out)
 102 {
 103         struct sha1_ce_state *sctx = shash_desc_ctx(desc);
 104
 105         memcpy(out, &sctx->sst, sizeof(struct sha1_state));
 106         return 0;
 107 }
 108
 109 static int sha1_ce_import(struct shash_desc *desc, const void *in)
 110 {
 111         struct sha1_ce_state *sctx = shash_desc_ctx(desc);
 112
 113         memcpy(&sctx->sst, in, sizeof(struct sha1_state));
 114         sctx->finalize = 0;
 115         return 0;
 116 }
 117
 118 static struct shash_alg alg = {
 119         .init                   = sha1_base_init,
 120         .update                 = sha1_ce_update,
 121         .final                  = sha1_ce_final,
 122         .finup                  = sha1_ce_finup,
 123         .import                 = sha1_ce_import,
 124         .export                 = sha1_ce_export,
 125         .descsize               = sizeof(struct sha1_ce_state),
 126         .statesize              = sizeof(struct sha1_state),
 127         .digestsize             = SHA1_DIGEST_SIZE,
 128         .base                   = {
 129                 .cra_name               = "sha1",
 130                 .cra_driver_name        = "sha1-ce",
 131                 .cra_priority           = 200,
 132                 .cra_blocksize          = SHA1_BLOCK_SIZE,
 133                 .cra_module             = THIS_MODULE,
 134         }
 135 };
 136
 137 static int __init sha1_ce_mod_init(void)
 138 {
 139         return crypto_register_shash(&alg);
 140 }
 141
 142 static void __exit sha1_ce_mod_fini(void)
 143 {
 144         crypto_unregister_shash(&alg);
 145 }
 146
 147 module_cpu_feature_match(SHA1, sha1_ce_mod_init);
 148 module_exit(sha1_ce_mod_fini);