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