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 void 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         sha1_ce_transform(container_of(sst, struct sha1_ce_state, sst), src,
  39                           blocks);
  40 }
  41
  42 const u32 sha1_ce_offsetof_count = offsetof(struct sha1_ce_state, sst.count);
  43 const u32 sha1_ce_offsetof_finalize = offsetof(struct sha1_ce_state, finalize);
  44
  45 static int sha1_ce_update(struct shash_desc *desc, const u8 *data,
  46                           unsigned int len)
  47 {
  48         struct sha1_ce_state *sctx = shash_desc_ctx(desc);
  49
  50         if (!crypto_simd_usable())
  51                 return crypto_sha1_update(desc, data, len);
  52
  53         sctx->finalize = 0;
  54         kernel_neon_begin();
  55         sha1_base_do_update(desc, data, len, __sha1_ce_transform);
  56         kernel_neon_end();
  57
  58         return 0;
  59 }
  60
  61 static int sha1_ce_finup(struct shash_desc *desc, const u8 *data,
  62                          unsigned int len, u8 *out)
  63 {
  64         struct sha1_ce_state *sctx = shash_desc_ctx(desc);
  65         bool finalize = !sctx->sst.count && !(len % SHA1_BLOCK_SIZE) && len;
  66
  67         if (!crypto_simd_usable())
  68                 return crypto_sha1_finup(desc, data, len, out);
  69
  70         /*
  71          * Allow the asm code to perform the finalization if there is no
  72          * partial data and the input is a round multiple of the block size.
  73          */
  74         sctx->finalize = finalize;
  75
  76         kernel_neon_begin();
  77         sha1_base_do_update(desc, data, len, __sha1_ce_transform);
  78         if (!finalize)
  79                 sha1_base_do_finalize(desc, __sha1_ce_transform);
  80         kernel_neon_end();
  81         return sha1_base_finish(desc, out);
  82 }
  83
  84 static int sha1_ce_final(struct shash_desc *desc, u8 *out)
  85 {
  86         struct sha1_ce_state *sctx = shash_desc_ctx(desc);
  87
  88         if (!crypto_simd_usable())
  89                 return crypto_sha1_finup(desc, NULL, 0, out);
  90
  91         sctx->finalize = 0;
  92         kernel_neon_begin();
  93         sha1_base_do_finalize(desc, __sha1_ce_transform);
  94         kernel_neon_end();
  95         return sha1_base_finish(desc, out);
  96 }
  97
  98 static int sha1_ce_export(struct shash_desc *desc, void *out)
  99 {
 100         struct sha1_ce_state *sctx = shash_desc_ctx(desc);
 101
 102         memcpy(out, &sctx->sst, sizeof(struct sha1_state));
 103         return 0;
 104 }
 105
 106 static int sha1_ce_import(struct shash_desc *desc, const void *in)
 107 {
 108         struct sha1_ce_state *sctx = shash_desc_ctx(desc);
 109
 110         memcpy(&sctx->sst, in, sizeof(struct sha1_state));
 111         sctx->finalize = 0;
 112         return 0;
 113 }
 114
 115 static struct shash_alg alg = {
 116         .init                   = sha1_base_init,
 117         .update                 = sha1_ce_update,
 118         .final                  = sha1_ce_final,
 119         .finup                  = sha1_ce_finup,
 120         .import                 = sha1_ce_import,
 121         .export                 = sha1_ce_export,
 122         .descsize               = sizeof(struct sha1_ce_state),
 123         .statesize              = sizeof(struct sha1_state),
 124         .digestsize             = SHA1_DIGEST_SIZE,
 125         .base                   = {
 126                 .cra_name               = "sha1",
 127                 .cra_driver_name        = "sha1-ce",
 128                 .cra_priority           = 200,
 129                 .cra_blocksize          = SHA1_BLOCK_SIZE,
 130                 .cra_module             = THIS_MODULE,
 131         }
 132 };
 133
 134 static int __init sha1_ce_mod_init(void)
 135 {
 136         return crypto_register_shash(&alg);
 137 }
 138
 139 static void __exit sha1_ce_mod_fini(void)
 140 {
 141         crypto_unregister_shash(&alg);
 142 }
 143
 144 module_cpu_feature_match(SHA1, sha1_ce_mod_init);
 145 module_exit(sha1_ce_mod_fini);