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Linux/arch/arm/crypto/sha256_glue.c

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  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(u32 *digest, const void *data,
 34                                         unsigned 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,
 43                                 (sha256_block_fn *)sha256_block_data_order);
 44 }
 45 EXPORT_SYMBOL(crypto_sha256_arm_update);
 46 
 47 static int sha256_final(struct shash_desc *desc, u8 *out)
 48 {
 49         sha256_base_do_finalize(desc,
 50                                 (sha256_block_fn *)sha256_block_data_order);
 51         return sha256_base_finish(desc, out);
 52 }
 53 
 54 int crypto_sha256_arm_finup(struct shash_desc *desc, const u8 *data,
 55                             unsigned int len, u8 *out)
 56 {
 57         sha256_base_do_update(desc, data, len,
 58                               (sha256_block_fn *)sha256_block_data_order);
 59         return sha256_final(desc, out);
 60 }
 61 EXPORT_SYMBOL(crypto_sha256_arm_finup);
 62 
 63 static struct shash_alg algs[] = { {
 64         .digestsize     =       SHA256_DIGEST_SIZE,
 65         .init           =       sha256_base_init,
 66         .update         =       crypto_sha256_arm_update,
 67         .final          =       sha256_final,
 68         .finup          =       crypto_sha256_arm_finup,
 69         .descsize       =       sizeof(struct sha256_state),
 70         .base           =       {
 71                 .cra_name       =       "sha256",
 72                 .cra_driver_name =      "sha256-asm",
 73                 .cra_priority   =       150,
 74                 .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
 75                 .cra_blocksize  =       SHA256_BLOCK_SIZE,
 76                 .cra_module     =       THIS_MODULE,
 77         }
 78 }, {
 79         .digestsize     =       SHA224_DIGEST_SIZE,
 80         .init           =       sha224_base_init,
 81         .update         =       crypto_sha256_arm_update,
 82         .final          =       sha256_final,
 83         .finup          =       crypto_sha256_arm_finup,
 84         .descsize       =       sizeof(struct sha256_state),
 85         .base           =       {
 86                 .cra_name       =       "sha224",
 87                 .cra_driver_name =      "sha224-asm",
 88                 .cra_priority   =       150,
 89                 .cra_flags      =       CRYPTO_ALG_TYPE_SHASH,
 90                 .cra_blocksize  =       SHA224_BLOCK_SIZE,
 91                 .cra_module     =       THIS_MODULE,
 92         }
 93 } };
 94 
 95 static int __init sha256_mod_init(void)
 96 {
 97         int res = crypto_register_shashes(algs, ARRAY_SIZE(algs));
 98 
 99         if (res < 0)
100                 return res;
101 
102         if (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) && cpu_has_neon()) {
103                 res = crypto_register_shashes(sha256_neon_algs,
104                                               ARRAY_SIZE(sha256_neon_algs));
105 
106                 if (res < 0)
107                         crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
108         }
109 
110         return res;
111 }
112 
113 static void __exit sha256_mod_fini(void)
114 {
115         crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
116 
117         if (IS_ENABLED(CONFIG_KERNEL_MODE_NEON) && cpu_has_neon())
118                 crypto_unregister_shashes(sha256_neon_algs,
119                                           ARRAY_SIZE(sha256_neon_algs));
120 }
121 
122 module_init(sha256_mod_init);
123 module_exit(sha256_mod_fini);
124 
125 MODULE_LICENSE("GPL");
126 MODULE_DESCRIPTION("SHA256 Secure Hash Algorithm (ARM), including NEON");
127 
128 MODULE_ALIAS_CRYPTO("sha256");
129 

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