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 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/unaligned.h>
  13 #include <crypto/internal/hash.h>
  14 #include <crypto/sha.h>
  15 #include <crypto/sha1_base.h>
  16 #include <linux/cpufeature.h>
  17 #include <linux/crypto.h>
  18 #include <linux/module.h>
  19
  20 MODULE_DESCRIPTION("SHA1 secure hash using ARMv8 Crypto Extensions");
  21 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
  22 MODULE_LICENSE("GPL v2");
  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         sctx->finalize = 0;
  41         kernel_neon_begin_partial(16);
  42         sha1_base_do_update(desc, data, len,
  43                             (sha1_block_fn *)sha1_ce_transform);
  44         kernel_neon_end();
  45
  46         return 0;
  47 }
  48
  49 static int sha1_ce_finup(struct shash_desc *desc, const u8 *data,
  50                          unsigned int len, u8 *out)
  51 {
  52         struct sha1_ce_state *sctx = shash_desc_ctx(desc);
  53         bool finalize = !sctx->sst.count && !(len % SHA1_BLOCK_SIZE);
  54
  55         /*
  56          * Allow the asm code to perform the finalization if there is no
  57          * partial data and the input is a round multiple of the block size.
  58          */
  59         sctx->finalize = finalize;
  60
  61         kernel_neon_begin_partial(16);
  62         sha1_base_do_update(desc, data, len,
  63                             (sha1_block_fn *)sha1_ce_transform);
  64         if (!finalize)
  65                 sha1_base_do_finalize(desc, (sha1_block_fn *)sha1_ce_transform);
  66         kernel_neon_end();
  67         return sha1_base_finish(desc, out);
  68 }
  69
  70 static int sha1_ce_final(struct shash_desc *desc, u8 *out)
  71 {
  72         struct sha1_ce_state *sctx = shash_desc_ctx(desc);
  73
  74         sctx->finalize = 0;
  75         kernel_neon_begin_partial(16);
  76         sha1_base_do_finalize(desc, (sha1_block_fn *)sha1_ce_transform);
  77         kernel_neon_end();
  78         return sha1_base_finish(desc, out);
  79 }
  80
  81 static struct shash_alg alg = {
  82         .init                   = sha1_base_init,
  83         .update                 = sha1_ce_update,
  84         .final                  = sha1_ce_final,
  85         .finup                  = sha1_ce_finup,
  86         .descsize               = sizeof(struct sha1_ce_state),
  87         .digestsize             = SHA1_DIGEST_SIZE,
  88         .base                   = {
  89                 .cra_name               = "sha1",
  90                 .cra_driver_name        = "sha1-ce",
  91                 .cra_priority           = 200,
  92                 .cra_flags              = CRYPTO_ALG_TYPE_SHASH,
  93                 .cra_blocksize          = SHA1_BLOCK_SIZE,
  94                 .cra_module             = THIS_MODULE,
  95         }
  96 };
  97
  98 static int __init sha1_ce_mod_init(void)
  99 {
 100         return crypto_register_shash(&alg);
 101 }
 102
 103 static void __exit sha1_ce_mod_fini(void)
 104 {
 105         crypto_unregister_shash(&alg);
 106 }
 107
 108 module_cpu_feature_match(SHA1, sha1_ce_mod_init);
 109 module_exit(sha1_ce_mod_fini);