sha3.h

Go to the documentation of this file.

// sha3.h - originally written and placed in the public domain by Wei Dai
 
 
#ifndef CRYPTOPP_SHA3_H
#define CRYPTOPP_SHA3_H
 
#include "cryptlib.h"
#include "secblock.h"
#include "misc.h"
 
NAMESPACE_BEGIN(CryptoPP)
 
 
class SHA3 : public HashTransformation
{
protected:
    SHA3(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 SHA3_Final : public SHA3
{
public:
    CRYPTOPP_CONSTANT(DIGESTSIZE = T_DigestSize);
    CRYPTOPP_CONSTANT(BLOCKSIZE = 200 - 2 * DIGESTSIZE);
    static std::string StaticAlgorithmName()
        { return "SHA3-" + IntToString(DIGESTSIZE * 8); }
 
    SHA3_Final() : SHA3(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
};
 
class SHA3_224 : public SHA3_Final<28> {};
 
class SHA3_256 : public SHA3_Final<32> {};
 
class SHA3_384 : public SHA3_Final<48> {};
 
class SHA3_512 : public SHA3_Final<64> {};
 
NAMESPACE_END
 
#endif