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

/// \file tiger.h

/// \brief Classes for the Tiger message digest

/// \details Crypto++ provides the original Tiger hash that was

///  submitted to the NESSIE project. The implementation is different

///  from the revised Tiger2 hash.

/// \sa <a href="https://www.cryptopp.com/wiki/Tiger">Tiger</a> and

///  <a href="http://www.cs.technion.ac.il/~biham/Reports/Tiger/">Tiger:

///  A Fast New Cryptographic Hash Function</a>

/// \since Crypto++ 2.1

#ifndef CRYPTOPP_TIGER_H

#define CRYPTOPP_TIGER_H

#include "config.h"

#include "iterhash.h"

// Clang 3.3 integrated assembler crash on Linux. Clang 3.4 due to compiler

// error with .intel_syntax, http://llvm.org/bugs/show_bug.cgi?id=24232

#if CRYPTOPP_BOOL_X32 || defined(CRYPTOPP_DISABLE_MIXED_ASM)

# define CRYPTOPP_DISABLE_TIGER_ASM 1

#endif

NAMESPACE_BEGIN(CryptoPP)

/// \brief Tiger message digest

/// \details Crypto++ provides the original Tiger hash that was

///  submitted to the NESSIE project. The implementation is different

///  from the revised Tiger2 hash.

/// \sa <a href="https://www.cryptopp.com/wiki/Tiger">Tiger</a> and

///  <a href="http://www.cs.technion.ac.il/~biham/Reports/Tiger/">Tiger:

///  A Fast New Cryptographic Hash Function</a>

/// \since Crypto++ 2.1

class Tiger : public IteratedHashWithStaticTransform<word64, LittleEndian, 64, 24, Tiger>

{

public:

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

  std::string AlgorithmProvider() const;

  /// \brief Initialize state array

  /// \param state the state of the hash

  static void InitState(HashWordType *state);

  /// \brief Operate the hash

  /// \param digest the state of the hash

  /// \param data the data to be digested

  static void Transform(word64 *digest, const word64 *data);

  /// \brief Computes the hash of the current message

  /// \param digest a pointer to the buffer to receive the hash

  /// \param digestSize the size of the truncated digest, in bytes

  /// \details TruncatedFinal() calls Final() and then copies digestSize bytes to digest.

  ///   The hash is restarted the hash for the next message.

  void TruncatedFinal(byte *digest, size_t digestSize);

protected:

  static const word64 table[4*256+3];

};

NAMESPACE_END

#endif