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/sha.h>
  16 #include <crypto/sha1_base.h>
  17 #include <linux/cpufeature.h>
  18 #include <linux/crypto.h>
  19 #include <linux/module.h>
  20
  21 MODULE_DESCRIPTION("SHA1 secure hash using ARMv8 Crypto Extensions");
  22 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
  23 MODULE_LICENSE("GPL v2");
  24
  25 struct sha1_ce_state {
  26         struct sha1_state       sst;
  27         u32                     finalize;
  28 };
  29
  30 asmlinkage void sha1_ce_transform(struct sha1_ce_state *sst, u8 const *src,
  31                                   int blocks);
  32
  33 const u32 sha1_ce_offsetof_count = offsetof(struct sha1_ce_state, sst.count);
  34 const u32 sha1_ce_offsetof_finalize = offsetof(struct sha1_ce_state, finalize);
  35
  36 static int sha1_ce_update(struct shash_desc *desc, const u8 *data,
  37                           unsigned int len)
  38 {
  39         struct sha1_ce_state *sctx = shash_desc_ctx(desc);
  40
  41         if (!may_use_simd())
  42                 return crypto_sha1_update(desc, data, len);
  43
  44         sctx->finalize = 0;
  45         kernel_neon_begin();
  46         sha1_base_do_update(desc, data, len,
  47                             (sha1_block_fn *)sha1_ce_transform);
  48         kernel_neon_end();
  49
  50         return 0;
  51 }
  52
  53 static int sha1_ce_finup(struct shash_desc *desc, const u8 *data,
  54                          unsigned int len, u8 *out)
  55 {
  56         struct sha1_ce_state *sctx = shash_desc_ctx(desc);
  57         bool finalize = !sctx->sst.count && !(len % SHA1_BLOCK_SIZE);
  58
  59         if (!may_use_simd())
  60                 return crypto_sha1_finup(desc, data, len, out);
  61
  62         /*
  63          * Allow the asm code to perform the finalization if there is no
  64          * partial data and the input is a round multiple of the block size.
  65          */
  66         sctx->finalize = finalize;
  67
  68         kernel_neon_begin();
  69         sha1_base_do_update(desc, data, len,
  70                             (sha1_block_fn *)sha1_ce_transform);
  71         if (!finalize)
  72                 sha1_base_do_finalize(desc, (sha1_block_fn *)sha1_ce_transform);
  73         kernel_neon_end();
  74         return sha1_base_finish(desc, out);
  75 }
  76
  77 static int sha1_ce_final(struct shash_desc *desc, u8 *out)
  78 {
  79         struct sha1_ce_state *sctx = shash_desc_ctx(desc);
  80
  81         if (!may_use_simd())
  82                 return crypto_sha1_finup(desc, NULL, 0, out);
  83
  84         sctx->finalize = 0;
  85         kernel_neon_begin();
  86         sha1_base_do_finalize(desc, (sha1_block_fn *)sha1_ce_transform);
  87         kernel_neon_end();
  88         return sha1_base_finish(desc, out);
  89 }
  90
  91 static struct shash_alg alg = {
  92         .init                   = sha1_base_init,
  93         .update                 = sha1_ce_update,
  94         .final                  = sha1_ce_final,
  95         .finup                  = sha1_ce_finup,
  96         .descsize               = sizeof(struct sha1_ce_state),
  97         .digestsize             = SHA1_DIGEST_SIZE,
  98         .base                   = {
  99                 .cra_name               = "sha1",
 100                 .cra_driver_name        = "sha1-ce",
 101                 .cra_priority           = 200,
 102                 .cra_flags              = CRYPTO_ALG_TYPE_SHASH,
 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);