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/types.h>
  19 #include <linux/string.h>
  20 #include <crypto/sha2.h>
  21 #include <crypto/sha256_base.h>
  22 #include <asm/simd.h>
  23 #include <asm/neon.h>
  24
  25 #include "sha256_glue.h"
  26
  27 asmlinkage void sha256_block_data_order(struct sha256_state *state,
  28                                         const u8 *data, int num_blks);
  29
  30 int crypto_sha256_arm_update(struct shash_desc *desc, const u8 *data,
  31                              unsigned int len)
  32 {
  33         /* make sure casting to sha256_block_fn() is safe */
  34         BUILD_BUG_ON(offsetof(struct sha256_state, state) != 0);
  35
  36         return sha256_base_do_update(desc, data, len, sha256_block_data_order);
  37 }
  38 EXPORT_SYMBOL(crypto_sha256_arm_update);
  39
  40 static int crypto_sha256_arm_final(struct shash_desc *desc, u8 *out)
  41 {
  42         sha256_base_do_finalize(desc, sha256_block_data_order);
  43         return sha256_base_finish(desc, out);
  44 }
  45
  46 int crypto_sha256_arm_finup(struct shash_desc *desc, const u8 *data,
  47                             unsigned int len, u8 *out)
  48 {
  49         sha256_base_do_update(desc, data, len, sha256_block_data_order);
  50         return crypto_sha256_arm_final(desc, out);
  51 }
  52 EXPORT_SYMBOL(crypto_sha256_arm_finup);
  53
  54 static struct shash_alg algs[] = { {
  55         .digestsize     =       SHA256_DIGEST_SIZE,
  56         .init           =       sha256_base_init,
  57         .update         =       crypto_sha256_arm_update,
  58         .final          =       crypto_sha256_arm_final,
  59         .finup          =       crypto_sha256_arm_finup,
  60         .descsize       =       sizeof(struct sha256_state),
  61         .base           =       {
  62                 .cra_name       =       "sha256",
  63                 .cra_driver_name =      "sha256-asm",
  64                 .cra_priority   =       150,
  65                 .cra_blocksize  =       SHA256_BLOCK_SIZE,
  66                 .cra_module     =       THIS_MODULE,
  67         }
  68 }, {
  69         .digestsize     =       SHA224_DIGEST_SIZE,
  70         .init           =       sha224_base_init,
  71         .update         =       crypto_sha256_arm_update,
  72         .final          =       crypto_sha256_arm_final,
  73         .finup          =       crypto_sha256_arm_finup,
  74         .descsize       =       sizeof(struct sha256_state),
  75         .base           =       {
  76                 .cra_name       =       "sha224",
  77                 .cra_driver_name =      "sha224-asm",
  78                 .cra_priority   =       150,
  79                 .cra_blocksize  =       SHA224_BLOCK_SIZE,
  80                 .cra_module     =       THIS_MODULE,
  81         }
  82 } };
  83
  84 static int __init sha256_mod_init(void)
  85 {
  86         int res = crypto_register_shashes(algs, ARRAY_SIZE(algs));
  87
  88         if (res < 0)
  89                 return res;
  90
  91         if (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) && cpu_has_neon()) {
  92                 res = crypto_register_shashes(sha256_neon_algs,
  93                                               ARRAY_SIZE(sha256_neon_algs));
  94
  95                 if (res < 0)
  96                         crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
  97         }
  98
  99         return res;
 100 }
 101
 102 static void __exit sha256_mod_fini(void)
 103 {
 104         crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
 105
 106         if (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) && cpu_has_neon())
 107                 crypto_unregister_shashes(sha256_neon_algs,
 108                                           ARRAY_SIZE(sha256_neon_algs));
 109 }
 110
 111 module_init(sha256_mod_init);
 112 module_exit(sha256_mod_fini);
 113
 114 MODULE_LICENSE("GPL");
 115 MODULE_DESCRIPTION("SHA256 Secure Hash Algorithm (ARM), including NEON");
 116
 117 MODULE_ALIAS_CRYPTO("sha256");