// md2.h - originally written and placed in the public domain by Wei Dai

/// \file md2.h

/// \brief Classes for the MD2 message digest

/// \since Crypto++ 3.0

#ifndef CRYPTOPP_MD2_H

#define CRYPTOPP_MD2_H

#include "cryptlib.h"

#include "secblock.h"

NAMESPACE_BEGIN(CryptoPP)

namespace Weak1 {

/// \brief MD2 message digest

/// \sa <a href="http://www.cryptolounge.org/wiki/MD2">MD2</a>

/// \since Crypto++ 3.0

class MD2 : public HashTransformation

{

public:

  CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() {return "MD2";}

  MD2();

  void Update(const byte *input, size_t length);

  void TruncatedFinal(byte *hash, size_t size);

  unsigned int DigestSize() const {return DIGESTSIZE;}

  unsigned int BlockSize() const {return BLOCKSIZE;}

  std::string AlgorithmName() const {return StaticAlgorithmName();}

  CRYPTOPP_CONSTANT(DIGESTSIZE = 16);

  CRYPTOPP_CONSTANT(BLOCKSIZE = 16);

private:

  void Transform();

  void Init();

  SecByteBlock m_X, m_C, m_buf;

  unsigned int m_count;

};

}

#if CRYPTOPP_ENABLE_NAMESPACE_WEAK >= 1

namespace Weak {using namespace Weak1;}   // import Weak1 into CryptoPP::Weak

#else

using namespace Weak1;  // import Weak1 into CryptoPP with warning

#ifdef __GNUC__

#warning "You may be using a weak algorithm that has been retained for backwards compatibility. Please '#define CRYPTOPP_ENABLE_NAMESPACE_WEAK 1' before including this .h file and prepend the class name with 'Weak::' to remove this warning."

#else

#pragma message("You may be using a weak algorithm that has been retained for backwards compatibility. Please '#define CRYPTOPP_ENABLE_NAMESPACE_WEAK 1' before including this .h file and prepend the class name with 'Weak::' to remove this warning.")

#endif

#endif

NAMESPACE_END

#endif