/*
   * Cryptographic API.
   *
   * SHA1 Secure Hash Algorithm.
   *
   * Derived from cryptoapi implementation, adapted for in-place
   * scatterlist interface.
   *
   * Copyright (c) Alan Smithee.
   * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
   * Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
   *
   * This program is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License as published by the Free
   * Software Foundation; either version 2 of the License, or (at your option)
   * any later version.
   *
   */

  #include <crypto/internal/hash.h>

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

  #include <linux/cryptohash.h>

  #include <linux/types.h>

  #include <crypto/sha.h>

  #include <crypto/sha1_base.h>

  #include <asm/byteorder.h>

  const u8 sha1_zero_message_hash[SHA1_DIGEST_SIZE] = {
  	0xda, 0x39, 0xa3, 0xee, 0x5e, 0x6b, 0x4b, 0x0d,
  	0x32, 0x55, 0xbf, 0xef, 0x95, 0x60, 0x18, 0x90,
  	0xaf, 0xd8, 0x07, 0x09
  };
  EXPORT_SYMBOL_GPL(sha1_zero_message_hash);

  static void sha1_generic_block_fn(struct sha1_state *sst, u8 const *src,
  				  int blocks)

  {

  	u32 temp[SHA_WORKSPACE_WORDS];

  	while (blocks--) {
  		sha_transform(sst->state, src, temp);
  		src += SHA1_BLOCK_SIZE;
  	}
  	memzero_explicit(temp, sizeof(temp));

  }

  int crypto_sha1_update(struct shash_desc *desc, const u8 *data,

  		       unsigned int len)

  {

  	return sha1_base_do_update(desc, data, len, sha1_generic_block_fn);

  }

  EXPORT_SYMBOL(crypto_sha1_update);

  static int sha1_final(struct shash_desc *desc, u8 *out)

  {

  	sha1_base_do_finalize(desc, sha1_generic_block_fn);
  	return sha1_base_finish(desc, out);

  }

  int crypto_sha1_finup(struct shash_desc *desc, const u8 *data,
  		      unsigned int len, u8 *out)

  {

  	sha1_base_do_update(desc, data, len, sha1_generic_block_fn);
  	return sha1_final(desc, out);

  }

  EXPORT_SYMBOL(crypto_sha1_finup);

  static struct shash_alg alg = {
  	.digestsize	=	SHA1_DIGEST_SIZE,

  	.init		=	sha1_base_init,

  	.update		=	crypto_sha1_update,

  	.final		=	sha1_final,

  	.finup		=	crypto_sha1_finup,

  	.descsize	=	sizeof(struct sha1_state),

  	.base		=	{
  		.cra_name	=	"sha1",
  		.cra_driver_name=	"sha1-generic",
  		.cra_flags	=	CRYPTO_ALG_TYPE_SHASH,
  		.cra_blocksize	=	SHA1_BLOCK_SIZE,
  		.cra_module	=	THIS_MODULE,
  	}

  };

  static int __init sha1_generic_mod_init(void)

  {

  	return crypto_register_shash(&alg);

  }

  static void __exit sha1_generic_mod_fini(void)

  {

  	crypto_unregister_shash(&alg);

  }

  module_init(sha1_generic_mod_init);
  module_exit(sha1_generic_mod_fini);

  
  MODULE_LICENSE("GPL");
  MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm");

  MODULE_ALIAS_CRYPTO("sha1");

  MODULE_ALIAS_CRYPTO("sha1-generic");