text: /**
   * \file sha1.h
   *
   * \brief SHA-1 cryptographic hash function
   *
   *  Copyright (C) 2006-2010, Brainspark B.V.
   *
   *  This file is part of PolarSSL (http://www.polarssl.org)
   *  Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
   *
   *  All rights reserved.
   *
   *  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.
   *
   *  This program is distributed in the hope that it will be useful,
   *  but WITHOUT ANY WARRANTY; without even the implied warranty of
   *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   *  GNU General Public License for more details.
   *
   *  You should have received a copy of the GNU General Public License along
   *  with this program; if not, write to the Free Software Foundation, Inc.,
   *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
   */
  #ifndef POLARSSL_SHA1_H
  #define POLARSSL_SHA1_H
  
  #include <string.h>
  
  #ifdef _MSC_VER
  #include <basetsd.h>
  typedef UINT32 uint32_t;
  #else
  #include <inttypes.h>
  #endif
  
  #define POLARSSL_ERR_SHA1_FILE_IO_ERROR                -0x0076  /**< Read/write error in file. */
  
  /**
   * \brief          SHA-1 context structure
   */
  typedef struct
  {
      uint32_t total[2];          /*!< number of bytes processed  */
      uint32_t state[5];          /*!< intermediate digest state  */
      unsigned char buffer[64];   /*!< data block being processed */
  
      unsigned char ipad[64];     /*!< HMAC: inner padding        */
      unsigned char opad[64];     /*!< HMAC: outer padding        */
  }
  sha1_context;
  
  /**
   * \brief          SHA-1 context setup
   *
   * \param ctx      context to be initialized
   */
  void sha1_starts( sha1_context *ctx );
  
  /**
   * \brief          SHA-1 process buffer
   *
   * \param ctx      SHA-1 context
   * \param input    buffer holding the  data
   * \param ilen     length of the input data
   */
  void sha1_update( sha1_context *ctx, const unsigned char *input, size_t ilen );
  
  /**
   * \brief          SHA-1 final digest
   *
   * \param ctx      SHA-1 context
   * \param output   SHA-1 checksum result
   */
  void sha1_finish( sha1_context *ctx, unsigned char output[20] );
  
  /**
   * \brief          Output = SHA-1( input buffer )
   *
   * \param input    buffer holding the  data
   * \param ilen     length of the input data
   * \param output   SHA-1 checksum result
   */
  void sha1( const unsigned char *input, size_t ilen, unsigned char output[20] );
  
  /**
   * \brief          Output = SHA-1( file contents )
   *
   * \param path     input file name
   * \param output   SHA-1 checksum result
   *
   * \return         0 if successful, or POLARSSL_ERR_SHA1_FILE_IO_ERROR
   */
  int sha1_file( const char *path, unsigned char output[20] );
  
  /**
   * \brief          SHA-1 HMAC context setup
   *
   * \param ctx      HMAC context to be initialized
   * \param key      HMAC secret key
   * \param keylen   length of the HMAC key
   */
  void sha1_hmac_starts( sha1_context *ctx, const unsigned char *key, size_t keylen );
  
  /**
   * \brief          SHA-1 HMAC process buffer
   *
   * \param ctx      HMAC context
   * \param input    buffer holding the  data
   * \param ilen     length of the input data
   */
  void sha1_hmac_update( sha1_context *ctx, const unsigned char *input, size_t ilen );
  
  /**
   * \brief          SHA-1 HMAC final digest
   *
   * \param ctx      HMAC context
   * \param output   SHA-1 HMAC checksum result
   */
  void sha1_hmac_finish( sha1_context *ctx, unsigned char output[20] );
  
  /**
   * \brief          SHA-1 HMAC context reset
   *
   * \param ctx      HMAC context to be reset
   */
  void sha1_hmac_reset( sha1_context *ctx );
  
  /**
   * \brief          Output = HMAC-SHA-1( hmac key, input buffer )
   *
   * \param key      HMAC secret key
   * \param keylen   length of the HMAC key
   * \param input    buffer holding the  data
   * \param ilen     length of the input data
   * \param output   HMAC-SHA-1 result
   */
  void sha1_hmac( const unsigned char *key, size_t keylen,
                  const unsigned char *input, size_t ilen,
                  unsigned char output[20] );
  
  /**
   * \brief          Checkup routine
   *
   * \return         0 if successful, or 1 if the test failed
   */
  int sha1_self_test( int verbose );
  
  #endif /* sha1.h */
  