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 static void __sha1_ce_transform(struct sha1_state *sst, u8 const *src,
  32                                 int blocks)
  33 {
  34         sha1_ce_transform(container_of(sst, struct sha1_ce_state, sst), src,
  35                           blocks);
  36 }
  37
  38 const u32 sha1_ce_offsetof_count = offsetof(struct sha1_ce_state, sst.count);
  39 const u32 sha1_ce_offsetof_finalize = offsetof(struct sha1_ce_state, finalize);
  40
  41 static int sha1_ce_update(struct shash_desc *desc, const u8 *data,
  42                           unsigned int len)
  43 {
  44         struct sha1_ce_state *sctx = shash_desc_ctx(desc);
  45
  46         if (!crypto_simd_usable())
  47                 return crypto_sha1_update(desc, data, len);
  48
  49         sctx->finalize = 0;
  50         kernel_neon_begin();
  51         sha1_base_do_update(desc, data, len, __sha1_ce_transform);
  52         kernel_neon_end();
  53
  54         return 0;
  55 }
  56
  57 static int sha1_ce_finup(struct shash_desc *desc, const u8 *data,
  58                          unsigned int len, u8 *out)
  59 {
  60         struct sha1_ce_state *sctx = shash_desc_ctx(desc);
  61         bool finalize = !sctx->sst.count && !(len % SHA1_BLOCK_SIZE) && len;
  62
  63         if (!crypto_simd_usable())
  64                 return crypto_sha1_finup(desc, data, len, out);
  65
  66         /*
  67          * Allow the asm code to perform the finalization if there is no
  68          * partial data and the input is a round multiple of the block size.
  69          */
  70         sctx->finalize = finalize;
  71
  72         kernel_neon_begin();
  73         sha1_base_do_update(desc, data, len, __sha1_ce_transform);
  74         if (!finalize)
  75                 sha1_base_do_finalize(desc, __sha1_ce_transform);
  76         kernel_neon_end();
  77         return sha1_base_finish(desc, out);
  78 }
  79
  80 static int sha1_ce_final(struct shash_desc *desc, u8 *out)
  81 {
  82         struct sha1_ce_state *sctx = shash_desc_ctx(desc);
  83
  84         if (!crypto_simd_usable())
  85                 return crypto_sha1_finup(desc, NULL, 0, out);
  86
  87         sctx->finalize = 0;
  88         kernel_neon_begin();
  89         sha1_base_do_finalize(desc, __sha1_ce_transform);
  90         kernel_neon_end();
  91         return sha1_base_finish(desc, out);
  92 }
  93
  94 static struct shash_alg alg = {
  95         .init                   = sha1_base_init,
  96         .update                 = sha1_ce_update,
  97         .final                  = sha1_ce_final,
  98         .finup                  = sha1_ce_finup,
  99         .descsize               = sizeof(struct sha1_ce_state),
 100         .digestsize             = SHA1_DIGEST_SIZE,
 101         .base                   = {
 102                 .cra_name               = "sha1",
 103                 .cra_driver_name        = "sha1-ce",
 104                 .cra_priority           = 200,
 105                 .cra_blocksize          = SHA1_BLOCK_SIZE,
 106                 .cra_module             = THIS_MODULE,
 107         }
 108 };
 109
 110 static int __init sha1_ce_mod_init(void)
 111 {
 112         return crypto_register_shash(&alg);
 113 }
 114
 115 static void __exit sha1_ce_mod_fini(void)
 116 {
 117         crypto_unregister_shash(&alg);
 118 }
 119
 120 module_cpu_feature_match(SHA1, sha1_ce_mod_init);
 121 module_exit(sha1_ce_mod_fini);