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 static int crypto_sha256_init(struct shash_desc *desc)
  37 {
  38         sha256_init(shash_desc_ctx(desc));
  39         return 0;
  40 }
  41
  42 static int crypto_sha224_init(struct shash_desc *desc)
  43 {
  44         sha224_init(shash_desc_ctx(desc));
  45         return 0;
  46 }
  47
  48 int crypto_sha256_update(struct shash_desc *desc, const u8 *data,
  49                           unsigned int len)
  50 {
  51         sha256_update(shash_desc_ctx(desc), data, len);
  52         return 0;
  53 }
  54 EXPORT_SYMBOL(crypto_sha256_update);
  55
  56 static int crypto_sha256_final(struct shash_desc *desc, u8 *out)
  57 {
  58         if (crypto_shash_digestsize(desc->tfm) == SHA224_DIGEST_SIZE)
  59                 sha224_final(shash_desc_ctx(desc), out);
  60         else
  61                 sha256_final(shash_desc_ctx(desc), out);
  62         return 0;
  63 }
  64
  65 int crypto_sha256_finup(struct shash_desc *desc, const u8 *data,
  66                         unsigned int len, u8 *hash)
  67 {
  68         sha256_update(shash_desc_ctx(desc), data, len);
  69         return crypto_sha256_final(desc, hash);
  70 }
  71 EXPORT_SYMBOL(crypto_sha256_finup);
  72
  73 static struct shash_alg sha256_algs[2] = { {
  74         .digestsize     =       SHA256_DIGEST_SIZE,
  75         .init           =       crypto_sha256_init,
  76         .update         =       crypto_sha256_update,
  77         .final          =       crypto_sha256_final,
  78         .finup          =       crypto_sha256_finup,
  79         .descsize       =       sizeof(struct sha256_state),
  80         .base           =       {
  81                 .cra_name       =       "sha256",
  82                 .cra_driver_name=       "sha256-generic",
  83                 .cra_priority   =       100,
  84                 .cra_blocksize  =       SHA256_BLOCK_SIZE,
  85                 .cra_module     =       THIS_MODULE,
  86         }
  87 }, {
  88         .digestsize     =       SHA224_DIGEST_SIZE,
  89         .init           =       crypto_sha224_init,
  90         .update         =       crypto_sha256_update,
  91         .final          =       crypto_sha256_final,
  92         .finup          =       crypto_sha256_finup,
  93         .descsize       =       sizeof(struct sha256_state),
  94         .base           =       {
  95                 .cra_name       =       "sha224",
  96                 .cra_driver_name=       "sha224-generic",
  97                 .cra_priority   =       100,
  98                 .cra_blocksize  =       SHA224_BLOCK_SIZE,
  99                 .cra_module     =       THIS_MODULE,
 100         }
 101 } };
 102
 103 static int __init sha256_generic_mod_init(void)
 104 {
 105         return crypto_register_shashes(sha256_algs, ARRAY_SIZE(sha256_algs));
 106 }
 107
 108 static void __exit sha256_generic_mod_fini(void)
 109 {
 110         crypto_unregister_shashes(sha256_algs, ARRAY_SIZE(sha256_algs));
 111 }
 112
 113 subsys_initcall(sha256_generic_mod_init);
 114 module_exit(sha256_generic_mod_fini);
 115
 116 MODULE_LICENSE("GPL");
 117 MODULE_DESCRIPTION("SHA-224 and SHA-256 Secure Hash Algorithm");
 118
 119 MODULE_ALIAS_CRYPTO("sha224");
 120 MODULE_ALIAS_CRYPTO("sha224-generic");
 121 MODULE_ALIAS_CRYPTO("sha256");
 122 MODULE_ALIAS_CRYPTO("sha256-generic");