LXR linux/crypto/sha256

   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
  20const 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};
  26EXPORT_SYMBOL_GPL(sha224_zero_message_hash);
  27
  28const 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};
  34EXPORT_SYMBOL_GPL(sha256_zero_message_hash);
  35
  36int 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}
  42EXPORT_SYMBOL(crypto_sha256_update);
  43
  44static 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
  53int 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}
  59EXPORT_SYMBOL(crypto_sha256_finup);
  60
  61static 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
  91static int __init sha256_generic_mod_init(void)
  92{
  93        return crypto_register_shashes(sha256_algs, ARRAY_SIZE(sha256_algs));
  94}
  95
  96static void __exit sha256_generic_mod_fini(void)
  97{
  98        crypto_unregister_shashes(sha256_algs, ARRAY_SIZE(sha256_algs));
  99}
 100
 101subsys_initcall(sha256_generic_mod_init);
 102module_exit(sha256_generic_mod_fini);
 103
 104MODULE_LICENSE("GPL");
 105MODULE_DESCRIPTION("SHA-224 and SHA-256 Secure Hash Algorithm");
 106
 107MODULE_ALIAS_CRYPTO("sha224");
 108MODULE_ALIAS_CRYPTO("sha224-generic");
 109MODULE_ALIAS_CRYPTO("sha256");
 110MODULE_ALIAS_CRYPTO("sha256-generic");
 111