arch/arm/crypto/sha256_glue.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Glue code for the SHA256 Secure Hash Algorithm assembly implementation
   4  * using optimized ARM assembler and NEON instructions.
   5  *
   6  * Copyright © 2015 Google Inc.
   7  *
   8  * This file is based on sha256_ssse3_glue.c:
   9  *   Copyright (C) 2013 Intel Corporation
  10  *   Author: Tim Chen <tim.c.chen@linux.intel.com>
  11  */
  12
  13 #include <crypto/internal/hash.h>
  14 #include <linux/crypto.h>
  15 #include <linux/init.h>
  16 #include <linux/module.h>
  17 #include <linux/mm.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/simd.h>
  24 #include <asm/neon.h>
  25
  26 #include "sha256_glue.h"
  27
  28 asmlinkage void sha256_block_data_order(struct sha256_state *state,
  29                                         const u8 *data, int num_blks);
  30
  31 int crypto_sha256_arm_update(struct shash_desc *desc, const u8 *data,
  32                              unsigned int len)
  33 {
  34         /* make sure casting to sha256_block_fn() is safe */
  35         BUILD_BUG_ON(offsetof(struct sha256_state, state) != 0);
  36
  37         return sha256_base_do_update(desc, data, len, sha256_block_data_order);
  38 }
  39 EXPORT_SYMBOL(crypto_sha256_arm_update);
  40
  41 static int crypto_sha256_arm_final(struct shash_desc *desc, u8 *out)
  42 {
  43         sha256_base_do_finalize(desc, sha256_block_data_order);
  44         return sha256_base_finish(desc, out);
  45 }
  46
  47 int crypto_sha256_arm_finup(struct shash_desc *desc, const u8 *data,
  48                             unsigned int len, u8 *out)
  49 {
  50         sha256_base_do_update(desc, data, len, sha256_block_data_order);
  51         return crypto_sha256_arm_final(desc, out);
  52 }
  53 EXPORT_SYMBOL(crypto_sha256_arm_finup);
  54
  55 static struct shash_alg algs[] = { {
  56         .digestsize     =       SHA256_DIGEST_SIZE,
  57         .init           =       sha256_base_init,
  58         .update         =       crypto_sha256_arm_update,
  59         .final          =       crypto_sha256_arm_final,
  60         .finup          =       crypto_sha256_arm_finup,
  61         .descsize       =       sizeof(struct sha256_state),
  62         .base           =       {
  63                 .cra_name       =       "sha256",
  64                 .cra_driver_name =      "sha256-asm",
  65                 .cra_priority   =       150,
  66                 .cra_blocksize  =       SHA256_BLOCK_SIZE,
  67                 .cra_module     =       THIS_MODULE,
  68         }
  69 }, {
  70         .digestsize     =       SHA224_DIGEST_SIZE,
  71         .init           =       sha224_base_init,
  72         .update         =       crypto_sha256_arm_update,
  73         .final          =       crypto_sha256_arm_final,
  74         .finup          =       crypto_sha256_arm_finup,
  75         .descsize       =       sizeof(struct sha256_state),
  76         .base           =       {
  77                 .cra_name       =       "sha224",
  78                 .cra_driver_name =      "sha224-asm",
  79                 .cra_priority   =       150,
  80                 .cra_blocksize  =       SHA224_BLOCK_SIZE,
  81                 .cra_module     =       THIS_MODULE,
  82         }
  83 } };
  84
  85 static int __init sha256_mod_init(void)
  86 {
  87         int res = crypto_register_shashes(algs, ARRAY_SIZE(algs));
  88
  89         if (res < 0)
  90                 return res;
  91
  92         if (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) && cpu_has_neon()) {
  93                 res = crypto_register_shashes(sha256_neon_algs,
  94                                               ARRAY_SIZE(sha256_neon_algs));
  95
  96                 if (res < 0)
  97                         crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
  98         }
  99
 100         return res;
 101 }
 102
 103 static void __exit sha256_mod_fini(void)
 104 {
 105         crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
 106
 107         if (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) && cpu_has_neon())
 108                 crypto_unregister_shashes(sha256_neon_algs,
 109                                           ARRAY_SIZE(sha256_neon_algs));
 110 }
 111
 112 module_init(sha256_mod_init);
 113 module_exit(sha256_mod_fini);
 114
 115 MODULE_LICENSE("GPL");
 116 MODULE_DESCRIPTION("SHA256 Secure Hash Algorithm (ARM), including NEON");
 117
 118 MODULE_ALIAS_CRYPTO("sha256");