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/***************************************************************************
* Copyright (C) 2005 by Joris Guisson *
* joris.guisson@gmail.com *
* *
* 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 BTSHA1HASHGEN_H
#define BTSHA1HASHGEN_H
#include "constants.h"
#include "sha1hash.h"
namespace bt
{
/**
* @author Joris Guisson
*
* Generates a SHA1 hash, code based on wikipedia's pseudocode
* There are 2 ways to use this class :
* - generate : all data is present from the start
* - start, update and end : data can be delivered in chunks
*
* Mixing the 2, is not a good idea
*/
class SHA1HashGen
{
Uint32 h0;
Uint32 h1;
Uint32 h2;
Uint32 h3;
Uint32 h4;
Uint8 tmp[64];
Uint32 tmp_len;
Uint32 total_len;
public:
SHA1HashGen();
~SHA1HashGen();
/**
* Generate a hash from a bunch of data.
* @param data The data
* @param len The length
* @return The SHA1 hash
*/
SHA1Hash generate(const Uint8* data,Uint32 len);
/**
* Start SHA1 hash generation in chunks.
*/
void start();
/**
* Update the hash.
* @param data The data
* @param len Length of the data
*/
void update(const Uint8* data,Uint32 len);
/**
* All data has been delivered, calculate the final hash.
* @return
*/
void end();
/**
* Get the hash generated.
*/
SHA1Hash get() const;
private:
void processChunk(const Uint8* c);
};
}
#endif
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