crypto/sha256_generic.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Crypto API wrapper for the generic SHA256 code from lib/crypto/sha256.c
   4  *
   5  * Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com>
   6  * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
   7  * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
   8  * SHA224 Support Copyright 2007 Intel Corporation <jonathan.lynch@intel.com>
   9  */
  10 #include <crypto/internal/hash.h>
  11 #include <linux/init.h>
  12 #include <linux/module.h>
  13 #include <linux/mm.h>
  14 #include <linux/types.h>
  15 #include <crypto/sha2.h>
  16 #include <crypto/sha256_base.h>
  17 #include <asm/byteorder.h>
  18 #include <asm/unaligned.h>
  19
  20 const u8 sha224_zero_message_hash[SHA224_DIGEST_SIZE] = {
  21         0xd1, 0x4a, 0x02, 0x8c, 0x2a, 0x3a, 0x2b, 0xc9, 0x47,
  22         0x61, 0x02, 0xbb, 0x28, 0x82, 0x34, 0xc4, 0x15, 0xa2,
  23         0xb0, 0x1f, 0x82, 0x8e, 0xa6, 0x2a, 0xc5, 0xb3, 0xe4,
  24         0x2f
  25 };
  26 EXPORT_SYMBOL_GPL(sha224_zero_message_hash);
  27
  28 const u8 sha256_zero_message_hash[SHA256_DIGEST_SIZE] = {
  29         0xe3, 0xb0, 0xc4, 0x42, 0x98, 0xfc, 0x1c, 0x14,
  30         0x9a, 0xfb, 0xf4, 0xc8, 0x99, 0x6f, 0xb9, 0x24,
  31         0x27, 0xae, 0x41, 0xe4, 0x64, 0x9b, 0x93, 0x4c,
  32         0xa4, 0x95, 0x99, 0x1b, 0x78, 0x52, 0xb8, 0x55
  33 };
  34 EXPORT_SYMBOL_GPL(sha256_zero_message_hash);
  35
  36 int crypto_sha256_update(struct shash_desc *desc, const u8 *data,
  37                           unsigned int len)
  38 {
  39         sha256_update(shash_desc_ctx(desc), data, len);
  40         return 0;
  41 }
  42 EXPORT_SYMBOL(crypto_sha256_update);
  43
  44 static int crypto_sha256_final(struct shash_desc *desc, u8 *out)
  45 {
  46         if (crypto_shash_digestsize(desc->tfm) == SHA224_DIGEST_SIZE)
  47                 sha224_final(shash_desc_ctx(desc), out);
  48         else
  49                 sha256_final(shash_desc_ctx(desc), out);
  50         return 0;
  51 }
  52
  53 int crypto_sha256_finup(struct shash_desc *desc, const u8 *data,
  54                         unsigned int len, u8 *hash)
  55 {
  56         sha256_update(shash_desc_ctx(desc), data, len);
  57         return crypto_sha256_final(desc, hash);
  58 }
  59 EXPORT_SYMBOL(crypto_sha256_finup);
  60
  61 static struct shash_alg sha256_algs[2] = { {
  62         .digestsize     =       SHA256_DIGEST_SIZE,
  63         .init           =       sha256_base_init,
  64         .update         =       crypto_sha256_update,
  65         .final          =       crypto_sha256_final,
  66         .finup          =       crypto_sha256_finup,
  67         .descsize       =       sizeof(struct sha256_state),
  68         .base           =       {
  69                 .cra_name       =       "sha256",
  70                 .cra_driver_name=       "sha256-generic",
  71                 .cra_priority   =       100,
  72                 .cra_blocksize  =       SHA256_BLOCK_SIZE,
  73                 .cra_module     =       THIS_MODULE,
  74         }
  75 }, {
  76         .digestsize     =       SHA224_DIGEST_SIZE,
  77         .init           =       sha224_base_init,
  78         .update         =       crypto_sha256_update,
  79         .final          =       crypto_sha256_final,
  80         .finup          =       crypto_sha256_finup,
  81         .descsize       =       sizeof(struct sha256_state),
  82         .base           =       {
  83                 .cra_name       =       "sha224",
  84                 .cra_driver_name=       "sha224-generic",
  85                 .cra_priority   =       100,
  86                 .cra_blocksize  =       SHA224_BLOCK_SIZE,
  87                 .cra_module     =       THIS_MODULE,
  88         }
  89 } };
  90
  91 static int __init sha256_generic_mod_init(void)
  92 {
  93         return crypto_register_shashes(sha256_algs, ARRAY_SIZE(sha256_algs));
  94 }
  95
  96 static void __exit sha256_generic_mod_fini(void)
  97 {
  98         crypto_unregister_shashes(sha256_algs, ARRAY_SIZE(sha256_algs));
  99 }
 100
 101 subsys_initcall(sha256_generic_mod_init);
 102 module_exit(sha256_generic_mod_fini);
 103
 104 MODULE_LICENSE("GPL");
 105 MODULE_DESCRIPTION("SHA-224 and SHA-256 Secure Hash Algorithm");
 106
 107 MODULE_ALIAS_CRYPTO("sha224");
 108 MODULE_ALIAS_CRYPTO("sha224-generic");
 109 MODULE_ALIAS_CRYPTO("sha256");
 110 MODULE_ALIAS_CRYPTO("sha256-generic");