arch/arm/crypto/sha256_glue.c

   1 /*
   2  * Glue code for the SHA256 Secure Hash Algorithm assembly implementation
   3  * using optimized ARM assembler and NEON instructions.
   4  *
   5  * Copyright © 2015 Google Inc.
   6  *
   7  * This file is based on sha256_ssse3_glue.c:
   8  *   Copyright (C) 2013 Intel Corporation
   9  *   Author: Tim Chen <tim.c.chen@linux.intel.com>
  10  *
  11  * This program is free software; you can redistribute it and/or modify it
  12  * under the terms of the GNU General Public License as published by the Free
  13  * Software Foundation; either version 2 of the License, or (at your option)
  14  * any later version.
  15  *
  16  */
  17
  18 #include <crypto/internal/hash.h>
  19 #include <linux/crypto.h>
  20 #include <linux/init.h>
  21 #include <linux/module.h>
  22 #include <linux/mm.h>
  23 #include <linux/cryptohash.h>
  24 #include <linux/types.h>
  25 #include <linux/string.h>
  26 #include <crypto/sha.h>
  27 #include <crypto/sha256_base.h>
  28 #include <asm/simd.h>
  29 #include <asm/neon.h>
  30
  31 #include "sha256_glue.h"
  32
  33 asmlinkage void sha256_block_data_order(struct sha256_state *state,
  34                                         const u8 *data, int num_blks);
  35
  36 int crypto_sha256_arm_update(struct shash_desc *desc, const u8 *data,
  37                              unsigned int len)
  38 {
  39         /* make sure casting to sha256_block_fn() is safe */
  40         BUILD_BUG_ON(offsetof(struct sha256_state, state) != 0);
  41
  42         return sha256_base_do_update(desc, data, len, sha256_block_data_order);
  43 }
  44 EXPORT_SYMBOL(crypto_sha256_arm_update);
  45
  46 static int crypto_sha256_arm_final(struct shash_desc *desc, u8 *out)
  47 {
  48         sha256_base_do_finalize(desc, sha256_block_data_order);
  49         return sha256_base_finish(desc, out);
  50 }
  51
  52 int crypto_sha256_arm_finup(struct shash_desc *desc, const u8 *data,
  53                             unsigned int len, u8 *out)
  54 {
  55         sha256_base_do_update(desc, data, len, sha256_block_data_order);
  56         return crypto_sha256_arm_final(desc, out);
  57 }
  58 EXPORT_SYMBOL(crypto_sha256_arm_finup);
  59
  60 static struct shash_alg algs[] = { {
  61         .digestsize     =       SHA256_DIGEST_SIZE,
  62         .init           =       sha256_base_init,
  63         .update         =       crypto_sha256_arm_update,
  64         .final          =       crypto_sha256_arm_final,
  65         .finup          =       crypto_sha256_arm_finup,
  66         .descsize       =       sizeof(struct sha256_state),
  67         .base           =       {
  68                 .cra_name       =       "sha256",
  69                 .cra_driver_name =      "sha256-asm",
  70                 .cra_priority   =       150,
  71                 .cra_blocksize  =       SHA256_BLOCK_SIZE,
  72                 .cra_module     =       THIS_MODULE,
  73         }
  74 }, {
  75         .digestsize     =       SHA224_DIGEST_SIZE,
  76         .init           =       sha224_base_init,
  77         .update         =       crypto_sha256_arm_update,
  78         .final          =       crypto_sha256_arm_final,
  79         .finup          =       crypto_sha256_arm_finup,
  80         .descsize       =       sizeof(struct sha256_state),
  81         .base           =       {
  82                 .cra_name       =       "sha224",
  83                 .cra_driver_name =      "sha224-asm",
  84                 .cra_priority   =       150,
  85                 .cra_blocksize  =       SHA224_BLOCK_SIZE,
  86                 .cra_module     =       THIS_MODULE,
  87         }
  88 } };
  89
  90 static int __init sha256_mod_init(void)
  91 {
  92         int res = crypto_register_shashes(algs, ARRAY_SIZE(algs));
  93
  94         if (res < 0)
  95                 return res;
  96
  97         if (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) && cpu_has_neon()) {
  98                 res = crypto_register_shashes(sha256_neon_algs,
  99                                               ARRAY_SIZE(sha256_neon_algs));
 100
 101                 if (res < 0)
 102                         crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
 103         }
 104
 105         return res;
 106 }
 107
 108 static void __exit sha256_mod_fini(void)
 109 {
 110         crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
 111
 112         if (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) && cpu_has_neon())
 113                 crypto_unregister_shashes(sha256_neon_algs,
 114                                           ARRAY_SIZE(sha256_neon_algs));
 115 }
 116
 117 module_init(sha256_mod_init);
 118 module_exit(sha256_mod_fini);
 119
 120 MODULE_LICENSE("GPL");
 121 MODULE_DESCRIPTION("SHA256 Secure Hash Algorithm (ARM), including NEON");
 122
 123 MODULE_ALIAS_CRYPTO("sha256");