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/sha.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
  23 struct sha1_ce_state {
  24         struct sha1_state       sst;
  25         u32                     finalize;
  26 };
  27
  28 asmlinkage void sha1_ce_transform(struct sha1_ce_state *sst, u8 const *src,
  29                                   int blocks);
  30
  31 const u32 sha1_ce_offsetof_count = offsetof(struct sha1_ce_state, sst.count);
  32 const u32 sha1_ce_offsetof_finalize = offsetof(struct sha1_ce_state, finalize);
  33
  34 static int sha1_ce_update(struct shash_desc *desc, const u8 *data,
  35                           unsigned int len)
  36 {
  37         struct sha1_ce_state *sctx = shash_desc_ctx(desc);
  38
  39         if (!crypto_simd_usable())
  40                 return crypto_sha1_update(desc, data, len);
  41
  42         sctx->finalize = 0;
  43         kernel_neon_begin();
  44         sha1_base_do_update(desc, data, len,
  45                             (sha1_block_fn *)sha1_ce_transform);
  46         kernel_neon_end();
  47
  48         return 0;
  49 }
  50
  51 static int sha1_ce_finup(struct shash_desc *desc, const u8 *data,
  52                          unsigned int len, u8 *out)
  53 {
  54         struct sha1_ce_state *sctx = shash_desc_ctx(desc);
  55         bool finalize = !sctx->sst.count && !(len % SHA1_BLOCK_SIZE);
  56
  57         if (!crypto_simd_usable())
  58                 return crypto_sha1_finup(desc, data, len, out);
  59
  60         /*
  61          * Allow the asm code to perform the finalization if there is no
  62          * partial data and the input is a round multiple of the block size.
  63          */
  64         sctx->finalize = finalize;
  65
  66         kernel_neon_begin();
  67         sha1_base_do_update(desc, data, len,
  68                             (sha1_block_fn *)sha1_ce_transform);
  69         if (!finalize)
  70                 sha1_base_do_finalize(desc, (sha1_block_fn *)sha1_ce_transform);
  71         kernel_neon_end();
  72         return sha1_base_finish(desc, out);
  73 }
  74
  75 static int sha1_ce_final(struct shash_desc *desc, u8 *out)
  76 {
  77         struct sha1_ce_state *sctx = shash_desc_ctx(desc);
  78
  79         if (!crypto_simd_usable())
  80                 return crypto_sha1_finup(desc, NULL, 0, out);
  81
  82         sctx->finalize = 0;
  83         kernel_neon_begin();
  84         sha1_base_do_finalize(desc, (sha1_block_fn *)sha1_ce_transform);
  85         kernel_neon_end();
  86         return sha1_base_finish(desc, out);
  87 }
  88
  89 static struct shash_alg alg = {
  90         .init                   = sha1_base_init,
  91         .update                 = sha1_ce_update,
  92         .final                  = sha1_ce_final,
  93         .finup                  = sha1_ce_finup,
  94         .descsize               = sizeof(struct sha1_ce_state),
  95         .digestsize             = SHA1_DIGEST_SIZE,
  96         .base                   = {
  97                 .cra_name               = "sha1",
  98                 .cra_driver_name        = "sha1-ce",
  99                 .cra_priority           = 200,
 100                 .cra_blocksize          = SHA1_BLOCK_SIZE,
 101                 .cra_module             = THIS_MODULE,
 102         }
 103 };
 104
 105 static int __init sha1_ce_mod_init(void)
 106 {
 107         return crypto_register_shash(&alg);
 108 }
 109
 110 static void __exit sha1_ce_mod_fini(void)
 111 {
 112         crypto_unregister_shash(&alg);
 113 }
 114
 115 module_cpu_feature_match(SHA1, sha1_ce_mod_init);
 116 module_exit(sha1_ce_mod_fini);