arch/arm64/crypto/sha1-ce-glue.c

   1 /*
   2  * sha1-ce-glue.c - SHA-1 secure hash using ARMv8 Crypto Extensions
   3  *
   4  * Copyright (C) 2014 - 2017 Linaro Ltd <ard.biesheuvel@linaro.org>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <asm/neon.h>
  12 #include <asm/simd.h>
  13 #include <asm/unaligned.h>
  14 #include <crypto/internal/hash.h>
  15 #include <crypto/internal/simd.h>
  16 #include <crypto/sha.h>
  17 #include <crypto/sha1_base.h>
  18 #include <linux/cpufeature.h>
  19 #include <linux/crypto.h>
  20 #include <linux/module.h>
  21
  22 MODULE_DESCRIPTION("SHA1 secure hash using ARMv8 Crypto Extensions");
  23 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
  24 MODULE_LICENSE("GPL v2");
  25
  26 struct sha1_ce_state {
  27         struct sha1_state       sst;
  28         u32                     finalize;
  29 };
  30
  31 asmlinkage void sha1_ce_transform(struct sha1_ce_state *sst, u8 const *src,
  32                                   int blocks);
  33
  34 const u32 sha1_ce_offsetof_count = offsetof(struct sha1_ce_state, sst.count);
  35 const u32 sha1_ce_offsetof_finalize = offsetof(struct sha1_ce_state, finalize);
  36
  37 static int sha1_ce_update(struct shash_desc *desc, const u8 *data,
  38                           unsigned int len)
  39 {
  40         struct sha1_ce_state *sctx = shash_desc_ctx(desc);
  41
  42         if (!crypto_simd_usable())
  43                 return crypto_sha1_update(desc, data, len);
  44
  45         sctx->finalize = 0;
  46         kernel_neon_begin();
  47         sha1_base_do_update(desc, data, len,
  48                             (sha1_block_fn *)sha1_ce_transform);
  49         kernel_neon_end();
  50
  51         return 0;
  52 }
  53
  54 static int sha1_ce_finup(struct shash_desc *desc, const u8 *data,
  55                          unsigned int len, u8 *out)
  56 {
  57         struct sha1_ce_state *sctx = shash_desc_ctx(desc);
  58         bool finalize = !sctx->sst.count && !(len % SHA1_BLOCK_SIZE);
  59
  60         if (!crypto_simd_usable())
  61                 return crypto_sha1_finup(desc, data, len, out);
  62
  63         /*
  64          * Allow the asm code to perform the finalization if there is no
  65          * partial data and the input is a round multiple of the block size.
  66          */
  67         sctx->finalize = finalize;
  68
  69         kernel_neon_begin();
  70         sha1_base_do_update(desc, data, len,
  71                             (sha1_block_fn *)sha1_ce_transform);
  72         if (!finalize)
  73                 sha1_base_do_finalize(desc, (sha1_block_fn *)sha1_ce_transform);
  74         kernel_neon_end();
  75         return sha1_base_finish(desc, out);
  76 }
  77
  78 static int sha1_ce_final(struct shash_desc *desc, u8 *out)
  79 {
  80         struct sha1_ce_state *sctx = shash_desc_ctx(desc);
  81
  82         if (!crypto_simd_usable())
  83                 return crypto_sha1_finup(desc, NULL, 0, out);
  84
  85         sctx->finalize = 0;
  86         kernel_neon_begin();
  87         sha1_base_do_finalize(desc, (sha1_block_fn *)sha1_ce_transform);
  88         kernel_neon_end();
  89         return sha1_base_finish(desc, out);
  90 }
  91
  92 static struct shash_alg alg = {
  93         .init                   = sha1_base_init,
  94         .update                 = sha1_ce_update,
  95         .final                  = sha1_ce_final,
  96         .finup                  = sha1_ce_finup,
  97         .descsize               = sizeof(struct sha1_ce_state),
  98         .digestsize             = SHA1_DIGEST_SIZE,
  99         .base                   = {
 100                 .cra_name               = "sha1",
 101                 .cra_driver_name        = "sha1-ce",
 102                 .cra_priority           = 200,
 103                 .cra_blocksize          = SHA1_BLOCK_SIZE,
 104                 .cra_module             = THIS_MODULE,
 105         }
 106 };
 107
 108 static int __init sha1_ce_mod_init(void)
 109 {
 110         return crypto_register_shash(&alg);
 111 }
 112
 113 static void __exit sha1_ce_mod_fini(void)
 114 {
 115         crypto_unregister_shash(&alg);
 116 }
 117
 118 module_cpu_feature_match(SHA1, sha1_ce_mod_init);
 119 module_exit(sha1_ce_mod_fini);