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//

// SHA1Engine.h

//

// $Id: //poco/1.3/Foundation/include/Poco/SHA1Engine.h#2 $

//

// Library: Foundation

// Package: Crypt

// Module:  SHA1Engine

//

// Definition of class SHA1Engine.

//

// Secure Hash Standard SHA-1 algorithm

// (FIPS 180-1, see http://www.itl.nist.gov/fipspubs/fip180-1.htm)

//

// Based on the public domain implementation by Peter C. Gutmann

// on 2 Sep 1992, modified by Carl Ellison to be SHA-1.

//

// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.

// and Contributors.

//

// Permission is hereby granted, free of charge, to any person or organization

// obtaining a copy of the software and accompanying documentation covered by

// this license (the "Software") to use, reproduce, display, distribute,

// execute, and transmit the Software, and to prepare derivative works of the

// Software, and to permit third-parties to whom the Software is furnished to

// do so, all subject to the following:

//

// The copyright notices in the Software and this entire statement, including

// the above license grant, this restriction and the following disclaimer,

// must be included in all copies of the Software, in whole or in part, and

// all derivative works of the Software, unless such copies or derivative

// works are solely in the form of machine-executable object code generated by

// a source language processor.

//

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT

// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE

// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,

// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER

// DEALINGS IN THE SOFTWARE.

//

#ifndef Foundation_SHA1Engine_INCLUDED

#define Foundation_SHA1Engine_INCLUDED

#include "Poco/Foundation.h"

#include "Poco/DigestEngine.h"

namespace Poco {

class Foundation_API SHA1Engine: public DigestEngine

        /// This class implementes the SHA-1 message digest algorithm.

        /// (FIPS 180-1, see http://www.itl.nist.gov/fipspubs/fip180-1.htm)

{

public:

        enum

        {

                BLOCK_SIZE  = 64,

                DIGEST_SIZE = 20

        };

        SHA1Engine();

        ~SHA1Engine();

        unsigned digestLength() const;

        void reset();

        const DigestEngine::Digest& digest();

protected:

        void updateImpl(const void* data, unsigned length);

private:

        void transform();

        static void byteReverse(UInt32* buffer, int byteCount);

        typedef UInt8 BYTE;

        struct Context

        {

                UInt32 digest[5]; // Message digest

                UInt32 countLo;   // 64-bit bit count

                UInt32 countHi;

                UInt32 data[16];  // SHA data buffer

                UInt32 slop;      // # of bytes saved in data[]

        };

        Context _context;

        DigestEngine::Digest _digest;

        SHA1Engine(const SHA1Engine&);

        SHA1Engine& operator = (const SHA1Engine&);

};

} // namespace Poco

#endif // Foundation_SHA1Engine_INCLUDED