linux/crypto/sha256_generic.c
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   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
  36static int crypto_sha256_init(struct shash_desc *desc)
  37{
  38        sha256_init(shash_desc_ctx(desc));
  39        return 0;
  40}
  41
  42static int crypto_sha224_init(struct shash_desc *desc)
  43{
  44        sha224_init(shash_desc_ctx(desc));
  45        return 0;
  46}
  47
  48int 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}
  54EXPORT_SYMBOL(crypto_sha256_update);
  55
  56static 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
  65int 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}
  71EXPORT_SYMBOL(crypto_sha256_finup);
  72
  73static 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
 103static int __init sha256_generic_mod_init(void)
 104{
 105        return crypto_register_shashes(sha256_algs, ARRAY_SIZE(sha256_algs));
 106}
 107
 108static void __exit sha256_generic_mod_fini(void)
 109{
 110        crypto_unregister_shashes(sha256_algs, ARRAY_SIZE(sha256_algs));
 111}
 112
 113subsys_initcall(sha256_generic_mod_init);
 114module_exit(sha256_generic_mod_fini);
 115
 116MODULE_LICENSE("GPL");
 117MODULE_DESCRIPTION("SHA-224 and SHA-256 Secure Hash Algorithm");
 118
 119MODULE_ALIAS_CRYPTO("sha224");
 120MODULE_ALIAS_CRYPTO("sha224-generic");
 121MODULE_ALIAS_CRYPTO("sha256");
 122MODULE_ALIAS_CRYPTO("sha256-generic");
 123
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