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//

// MD4Engine.h

//

// $Id: //poco/1.3/Foundation/include/Poco/MD4Engine.h#2 $

//

// Library: Foundation

// Package: Crypt

// Module:  MD4Engine

//

// Definition of class MD4Engine.

//

// 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.

//

//

// MD4 (RFC 1320) algorithm:

// Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All

// rights reserved.

//

// License to copy and use this software is granted provided that it

// is identified as the "RSA Data Security, Inc. MD4 Message-Digest

// Algorithm" in all material mentioning or referencing this software

// or this function.

//

// License is also granted to make and use derivative works provided

// that such works are identified as "derived from the RSA Data

// Security, Inc. MD4 Message-Digest Algorithm" in all material

// mentioning or referencing the derived work.

//

// RSA Data Security, Inc. makes no representations concerning either

// the merchantability of this software or the suitability of this

// software for any particular purpose. It is provided "as is"

// without express or implied warranty of any kind.

//

// These notices must be retained in any copies of any part of this

// documentation and/or software.

//

#ifndef Foundation_MD4Engine_INCLUDED

#define Foundation_MD4Engine_INCLUDED

#include "Poco/Foundation.h"

#include "Poco/DigestEngine.h"

namespace Poco {

class Foundation_API MD4Engine: public DigestEngine

        /// This class implementes the MD4 message digest algorithm,

        /// described in RFC 1320.

{

public:

        enum

        {

                BLOCK_SIZE  = 64,

                DIGEST_SIZE = 16

        };

        MD4Engine();

        ~MD4Engine();

        unsigned digestLength() const;

        void reset();

        const DigestEngine::Digest& digest();

protected:

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

private:

        static void transform(UInt32 state[4], const unsigned char block[64]);

        static void encode(unsigned char* output, const UInt32* input, unsigned int len);

        static void decode(UInt32* output, const unsigned char* input, unsigned int len);

        struct Context

        {

                UInt32 state[4];          // state (ABCD)

                UInt32 count[2];          // number of bits, modulo 2^64 (lsb first)

                unsigned char buffer[64]; // input buffer

        };

        Context _context;

        DigestEngine::Digest _digest;

        MD4Engine(const MD4Engine&);

        MD4Engine& operator = (const MD4Engine&);

};

} // namespace Poco

#endif // Foundation_MD5Engine_INCLUDED