keccak.h

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// keccak.h - originally written and placed in the public domain by Wei Dai
 
 
#ifndef CRYPTOPP_KECCAK_H
#define CRYPTOPP_KECCAK_H
 
#include "cryptlib.h"
#include "secblock.h"
 
NAMESPACE_BEGIN(CryptoPP)
 
 
class Keccak : public HashTransformation
{
protected:
    Keccak(unsigned int digestSize) : m_digestSize(digestSize) {Restart();}
 
public:
    unsigned int DigestSize() const {return m_digestSize;}
    unsigned int OptimalDataAlignment() const {return GetAlignmentOf<word64>();}
 
    void Update(const byte *input, size_t length);
    void Restart();
    void TruncatedFinal(byte *hash, size_t size);
 
protected:
    inline unsigned int r() const {return BlockSize();}
 
    FixedSizeSecBlock<word64, 25> m_state;
    unsigned int m_digestSize, m_counter;
};
 
template<unsigned int T_DigestSize>
class Keccak_Final : public Keccak
{
public:
    CRYPTOPP_CONSTANT(DIGESTSIZE = T_DigestSize);
    CRYPTOPP_CONSTANT(BLOCKSIZE = 200 - 2 * DIGESTSIZE);
    static std::string StaticAlgorithmName()
        { return "Keccak-" + IntToString(DIGESTSIZE * 8); }
 
    Keccak_Final() : Keccak(DIGESTSIZE) {}
 
    unsigned int BlockSize() const { return BLOCKSIZE; }
 
    std::string AlgorithmName() const { return StaticAlgorithmName(); }
 
private:
#if !defined(__BORLANDC__)
    // ensure there was no underflow in the math
    CRYPTOPP_COMPILE_ASSERT(BLOCKSIZE < 200);
#endif
};
 
DOCUMENTED_TYPEDEF(Keccak_Final<28>, Keccak_224);
 
DOCUMENTED_TYPEDEF(Keccak_Final<32>, Keccak_256);
 
DOCUMENTED_TYPEDEF(Keccak_Final<48>, Keccak_384);
 
DOCUMENTED_TYPEDEF(Keccak_Final<64>, Keccak_512);
 
NAMESPACE_END
 
#endif