arch/arm/crypto/sha256_neon_glue.c

   1 /*
   2  * Glue code for the SHA256 Secure Hash Algorithm assembly implementation
   3  * using NEON instructions.
   4  *
   5  * Copyright © 2015 Google Inc.
   6  *
   7  * This file is based on sha512_neon_glue.c:
   8  *   Copyright © 2014 Jussi Kivilinna <jussi.kivilinna@iki.fi>
   9  *
  10  * This program is free software; you can redistribute it and/or modify it
  11  * under the terms of the GNU General Public License as published by the Free
  12  * Software Foundation; either version 2 of the License, or (at your option)
  13  * any later version.
  14  *
  15  */
  16
  17 #include <crypto/internal/hash.h>
  18 #include <linux/cryptohash.h>
  19 #include <linux/types.h>
  20 #include <linux/string.h>
  21 #include <crypto/sha.h>
  22 #include <crypto/sha256_base.h>
  23 #include <asm/byteorder.h>
  24 #include <asm/simd.h>
  25 #include <asm/neon.h>
  26
  27 #include "sha256_glue.h"
  28
  29 asmlinkage void sha256_block_data_order_neon(u32 *digest, const void *data,
  30                                              unsigned int num_blks);
  31
  32 static int sha256_update(struct shash_desc *desc, const u8 *data,
  33                          unsigned int len)
  34 {
  35         struct sha256_state *sctx = shash_desc_ctx(desc);
  36
  37         if (!may_use_simd() ||
  38             (sctx->count % SHA256_BLOCK_SIZE) + len < SHA256_BLOCK_SIZE)
  39                 return crypto_sha256_arm_update(desc, data, len);
  40
  41         kernel_neon_begin();
  42         sha256_base_do_update(desc, data, len,
  43                         (sha256_block_fn *)sha256_block_data_order_neon);
  44         kernel_neon_end();
  45
  46         return 0;
  47 }
  48
  49 static int sha256_finup(struct shash_desc *desc, const u8 *data,
  50                         unsigned int len, u8 *out)
  51 {
  52         if (!may_use_simd())
  53                 return crypto_sha256_arm_finup(desc, data, len, out);
  54
  55         kernel_neon_begin();
  56         if (len)
  57                 sha256_base_do_update(desc, data, len,
  58                         (sha256_block_fn *)sha256_block_data_order_neon);
  59         sha256_base_do_finalize(desc,
  60                         (sha256_block_fn *)sha256_block_data_order_neon);
  61         kernel_neon_end();
  62
  63         return sha256_base_finish(desc, out);
  64 }
  65
  66 static int sha256_final(struct shash_desc *desc, u8 *out)
  67 {
  68         return sha256_finup(desc, NULL, 0, out);
  69 }
  70
  71 struct shash_alg sha256_neon_algs[] = { {
  72         .digestsize     =       SHA256_DIGEST_SIZE,
  73         .init           =       sha256_base_init,
  74         .update         =       sha256_update,
  75         .final          =       sha256_final,
  76         .finup          =       sha256_finup,
  77         .descsize       =       sizeof(struct sha256_state),
  78         .base           =       {
  79                 .cra_name       =       "sha256",
  80                 .cra_driver_name =      "sha256-neon",
  81                 .cra_priority   =       250,
  82                 .cra_blocksize  =       SHA256_BLOCK_SIZE,
  83                 .cra_module     =       THIS_MODULE,
  84         }
  85 }, {
  86         .digestsize     =       SHA224_DIGEST_SIZE,
  87         .init           =       sha224_base_init,
  88         .update         =       sha256_update,
  89         .final          =       sha256_final,
  90         .finup          =       sha256_finup,
  91         .descsize       =       sizeof(struct sha256_state),
  92         .base           =       {
  93                 .cra_name       =       "sha224",
  94                 .cra_driver_name =      "sha224-neon",
  95                 .cra_priority   =       250,
  96                 .cra_blocksize  =       SHA224_BLOCK_SIZE,
  97                 .cra_module     =       THIS_MODULE,
  98         }
  99 } };