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 #define ASM_EXPORT(sym, val) \
  21         asm(".globl " #sym "; .set " #sym ", %0" :: "I"(val));
  22
  23 MODULE_DESCRIPTION("SHA1 secure hash using ARMv8 Crypto Extensions");
  24 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
  25 MODULE_LICENSE("GPL v2");
  26
  27 struct sha1_ce_state {
  28         struct sha1_state       sst;
  29         u32                     finalize;
  30 };
  31
  32 asmlinkage void sha1_ce_transform(struct sha1_ce_state *sst, u8 const *src,
  33                                   int blocks);
  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         ASM_EXPORT(sha1_ce_offsetof_count,
  56                    offsetof(struct sha1_ce_state, sst.count));
  57         ASM_EXPORT(sha1_ce_offsetof_finalize,
  58                    offsetof(struct sha1_ce_state, finalize));
  59
  60         /*
  61          * Allow the asm code to perform the finalization if there is no
  62          * partial data and the input is a round multiple of the block size.
  63          */
  64         sctx->finalize = finalize;
  65
  66         kernel_neon_begin_partial(16);
  67         sha1_base_do_update(desc, data, len,
  68                             (sha1_block_fn *)sha1_ce_transform);
  69         if (!finalize)
  70                 sha1_base_do_finalize(desc, (sha1_block_fn *)sha1_ce_transform);
  71         kernel_neon_end();
  72         return sha1_base_finish(desc, out);
  73 }
  74
  75 static int sha1_ce_final(struct shash_desc *desc, u8 *out)
  76 {
  77         struct sha1_ce_state *sctx = shash_desc_ctx(desc);
  78
  79         sctx->finalize = 0;
  80         kernel_neon_begin_partial(16);
  81         sha1_base_do_finalize(desc, (sha1_block_fn *)sha1_ce_transform);
  82         kernel_neon_end();
  83         return sha1_base_finish(desc, out);
  84 }
  85
  86 static struct shash_alg alg = {
  87         .init                   = sha1_base_init,
  88         .update                 = sha1_ce_update,
  89         .final                  = sha1_ce_final,
  90         .finup                  = sha1_ce_finup,
  91         .descsize               = sizeof(struct sha1_ce_state),
  92         .digestsize             = SHA1_DIGEST_SIZE,
  93         .base                   = {
  94                 .cra_name               = "sha1",
  95                 .cra_driver_name        = "sha1-ce",
  96                 .cra_priority           = 200,
  97                 .cra_flags              = CRYPTO_ALG_TYPE_SHASH,
  98                 .cra_blocksize          = SHA1_BLOCK_SIZE,
  99                 .cra_module             = THIS_MODULE,
 100         }
 101 };
 102
 103 static int __init sha1_ce_mod_init(void)
 104 {
 105         return crypto_register_shash(&alg);
 106 }
 107
 108 static void __exit sha1_ce_mod_fini(void)
 109 {
 110         crypto_unregister_shash(&alg);
 111 }
 112
 113 module_cpu_feature_match(SHA1, sha1_ce_mod_init);
 114 module_exit(sha1_ce_mod_fini);