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(u32 *digest, const void *data,
  29                                         unsigned 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,
  38                                 (sha256_block_fn *)sha256_block_data_order);
  39 }
  40 EXPORT_SYMBOL(crypto_sha256_arm_update);
  41
  42 static int sha256_final(struct shash_desc *desc, u8 *out)
  43 {
  44         sha256_base_do_finalize(desc,
  45                                 (sha256_block_fn *)sha256_block_data_order);
  46         return sha256_base_finish(desc, out);
  47 }
  48
  49 int crypto_sha256_arm_finup(struct shash_desc *desc, const u8 *data,
  50                             unsigned int len, u8 *out)
  51 {
  52         sha256_base_do_update(desc, data, len,
  53                               (sha256_block_fn *)sha256_block_data_order);
  54         return sha256_final(desc, out);
  55 }
  56 EXPORT_SYMBOL(crypto_sha256_arm_finup);
  57
  58 static struct shash_alg algs[] = { {
  59         .digestsize     =       SHA256_DIGEST_SIZE,
  60         .init           =       sha256_base_init,
  61         .update         =       crypto_sha256_arm_update,
  62         .final          =       sha256_final,
  63         .finup          =       crypto_sha256_arm_finup,
  64         .descsize       =       sizeof(struct sha256_state),
  65         .base           =       {
  66                 .cra_name       =       "sha256",
  67                 .cra_driver_name =      "sha256-asm",
  68                 .cra_priority   =       150,
  69                 .cra_blocksize  =       SHA256_BLOCK_SIZE,
  70                 .cra_module     =       THIS_MODULE,
  71         }
  72 }, {
  73         .digestsize     =       SHA224_DIGEST_SIZE,
  74         .init           =       sha224_base_init,
  75         .update         =       crypto_sha256_arm_update,
  76         .final          =       sha256_final,
  77         .finup          =       crypto_sha256_arm_finup,
  78         .descsize       =       sizeof(struct sha256_state),
  79         .base           =       {
  80                 .cra_name       =       "sha224",
  81                 .cra_driver_name =      "sha224-asm",
  82                 .cra_priority   =       150,
  83                 .cra_blocksize  =       SHA224_BLOCK_SIZE,
  84                 .cra_module     =       THIS_MODULE,
  85         }
  86 } };
  87
  88 static int __init sha256_mod_init(void)
  89 {
  90         int res = crypto_register_shashes(algs, ARRAY_SIZE(algs));
  91
  92         if (res < 0)
  93                 return res;
  94
  95         if (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) && cpu_has_neon()) {
  96                 res = crypto_register_shashes(sha256_neon_algs,
  97                                               ARRAY_SIZE(sha256_neon_algs));
  98
  99                 if (res < 0)
 100                         crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
 101         }
 102
 103         return res;
 104 }
 105
 106 static void __exit sha256_mod_fini(void)
 107 {
 108         crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
 109
 110         if (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) && cpu_has_neon())
 111                 crypto_unregister_shashes(sha256_neon_algs,
 112                                           ARRAY_SIZE(sha256_neon_algs));
 113 }
 114
 115 module_init(sha256_mod_init);
 116 module_exit(sha256_mod_fini);
 117
 118 MODULE_LICENSE("GPL");
 119 MODULE_DESCRIPTION("SHA256 Secure Hash Algorithm (ARM), including NEON");
 120
 121 MODULE_ALIAS_CRYPTO("sha256");