// SPDX-License-Identifier: GPL-2.0-or-later

  /*

   * Crypto API wrapper for the generic SHA256 code from lib/crypto/sha256.c

   *
   * Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com>
   * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
   * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>

   * SHA224 Support Copyright 2007 Intel Corporation <jonathan.lynch@intel.com>

   */

  #include <crypto/internal/hash.h>

  #include <linux/init.h>
  #include <linux/module.h>
  #include <linux/mm.h>

  #include <linux/types.h>

  #include <crypto/sha.h>

  #include <crypto/sha256_base.h>

  #include <asm/byteorder.h>

  #include <asm/unaligned.h>

  const u8 sha224_zero_message_hash[SHA224_DIGEST_SIZE] = {
  	0xd1, 0x4a, 0x02, 0x8c, 0x2a, 0x3a, 0x2b, 0xc9, 0x47,
  	0x61, 0x02, 0xbb, 0x28, 0x82, 0x34, 0xc4, 0x15, 0xa2,
  	0xb0, 0x1f, 0x82, 0x8e, 0xa6, 0x2a, 0xc5, 0xb3, 0xe4,
  	0x2f
  };
  EXPORT_SYMBOL_GPL(sha224_zero_message_hash);
  
  const u8 sha256_zero_message_hash[SHA256_DIGEST_SIZE] = {
  	0xe3, 0xb0, 0xc4, 0x42, 0x98, 0xfc, 0x1c, 0x14,
  	0x9a, 0xfb, 0xf4, 0xc8, 0x99, 0x6f, 0xb9, 0x24,
  	0x27, 0xae, 0x41, 0xe4, 0x64, 0x9b, 0x93, 0x4c,
  	0xa4, 0x95, 0x99, 0x1b, 0x78, 0x52, 0xb8, 0x55
  };
  EXPORT_SYMBOL_GPL(sha256_zero_message_hash);

  static int crypto_sha256_init(struct shash_desc *desc)

  {

  	return sha256_init(shash_desc_ctx(desc));

  }

  static int crypto_sha224_init(struct shash_desc *desc)

  {

  	return sha224_init(shash_desc_ctx(desc));

  }

  int crypto_sha256_update(struct shash_desc *desc, const u8 *data,

  			  unsigned int len)

  {

  	return sha256_update(shash_desc_ctx(desc), data, len);

  }

  EXPORT_SYMBOL(crypto_sha256_update);

  static int crypto_sha256_final(struct shash_desc *desc, u8 *out)

  {

  	if (crypto_shash_digestsize(desc->tfm) == SHA224_DIGEST_SIZE)
  		return sha224_final(shash_desc_ctx(desc), out);
  	else
  		return sha256_final(shash_desc_ctx(desc), out);

  }

  int crypto_sha256_finup(struct shash_desc *desc, const u8 *data,
  			unsigned int len, u8 *hash)

  {

  	sha256_update(shash_desc_ctx(desc), data, len);
  	return crypto_sha256_final(desc, hash);

  }

  EXPORT_SYMBOL(crypto_sha256_finup);

  static struct shash_alg sha256_algs[2] = { {

  	.digestsize	=	SHA256_DIGEST_SIZE,

  	.init		=	crypto_sha256_init,

  	.update		=	crypto_sha256_update,

  	.final		=	crypto_sha256_final,

  	.finup		=	crypto_sha256_finup,

  	.descsize	=	sizeof(struct sha256_state),

  	.base		=	{
  		.cra_name	=	"sha256",
  		.cra_driver_name=	"sha256-generic",

  		.cra_priority	=	100,

  		.cra_blocksize	=	SHA256_BLOCK_SIZE,
  		.cra_module	=	THIS_MODULE,
  	}

  }, {

  	.digestsize	=	SHA224_DIGEST_SIZE,

  	.init		=	crypto_sha224_init,

  	.update		=	crypto_sha256_update,

  	.final		=	crypto_sha256_final,

  	.finup		=	crypto_sha256_finup,

  	.descsize	=	sizeof(struct sha256_state),

  	.base		=	{
  		.cra_name	=	"sha224",
  		.cra_driver_name=	"sha224-generic",

  		.cra_priority	=	100,

  		.cra_blocksize	=	SHA224_BLOCK_SIZE,
  		.cra_module	=	THIS_MODULE,
  	}

  } };

  static int __init sha256_generic_mod_init(void)

  {

  	return crypto_register_shashes(sha256_algs, ARRAY_SIZE(sha256_algs));

  }

  static void __exit sha256_generic_mod_fini(void)

  {

  	crypto_unregister_shashes(sha256_algs, ARRAY_SIZE(sha256_algs));

  }

  subsys_initcall(sha256_generic_mod_init);

  module_exit(sha256_generic_mod_fini);

  
  MODULE_LICENSE("GPL");

  MODULE_DESCRIPTION("SHA-224 and SHA-256 Secure Hash Algorithm");

  MODULE_ALIAS_CRYPTO("sha224");

  MODULE_ALIAS_CRYPTO("sha224-generic");

  MODULE_ALIAS_CRYPTO("sha256");

  MODULE_ALIAS_CRYPTO("sha256-generic");