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// keccak.h - written and placed in the public domain by Wei Dai
//! \file keccak.h
//! \brief Classes for Keccak message digests
//! \details The Crypto++ Keccak implementation uses F1600 with XOF d=0x01.
//! FIPS 202 conformance (XOF d=0x06) is available in SHA3 classes.
//! \details Keccak will likely change in the future to accomodate extensibility of the
//! round function and the XOF functions.
//! \sa <a href="http://en.wikipedia.org/wiki/Keccak">Keccak</a>
//! \since Crypto++ 5.6.4
#ifndef CRYPTOPP_KECCAK_H
#define CRYPTOPP_KECCAK_H
#include "cryptlib.h"
#include "secblock.h"
NAMESPACE_BEGIN(CryptoPP)
//! \class Keccak
//! \brief Keccak message digest base class
//! \details The Crypto++ Keccak implementation uses F1600 with XOF d=0x01.
//! FIPS 202 conformance (XOF d=0x06) is available in SHA3 classes.
//! \details Keccak is the base class for Keccak_224, Keccak_256, Keccak_384 and Keccak_512.
//! Library users should instantiate a derived class, and only use Keccak
//! as a base class reference or pointer.
//! \details Keccak will likely change in the future to accomodate extensibility of the
//! round function and the XOF functions.
//! \details Perform the following to specify a different digest size. The class will use F1600,
//! XOF d=0x01, and a new vaue for <tt>r()</tt> (which will be <tt>200-2*24 = 152</tt>).
//! <pre> Keccack_192 : public Keccack
//! {
//! public:
//! CRYPTOPP_CONSTANT(DIGESTSIZE = 24)
//! Keccack_192() : Keccack(DIGESTSIZE) {}
//! };
//! </pre>
//!
//! \sa SHA3, Keccak_224, Keccak_256, Keccak_384 and Keccak_512.
//! \since Crypto++ 5.6.4
class Keccak : public HashTransformation
{
public:
//! \brief Construct a Keccak
//! \param digestSize the digest size, in bytes
//! \details Keccak is the base class for Keccak_224, Keccak_256, Keccak_384 and Keccak_512.
//! Library users should instantiate a derived class, and only use Keccak
//! as a base class reference or pointer.
//! \since Crypto++ 5.6.4
Keccak(unsigned int digestSize) : m_digestSize(digestSize) {Restart();}
unsigned int DigestSize() const {return m_digestSize;}
std::string AlgorithmName() const {return "Keccak-" + IntToString(m_digestSize*8);}
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 200 - 2 * m_digestSize;}
FixedSizeSecBlock<word64, 25> m_state;
unsigned int m_digestSize, m_counter;
};
//! \class Keccak_224
//! \brief Keccak-224 message digest
//! \since Crypto++ 5.6.4
class Keccak_224 : public Keccak
{
public:
CRYPTOPP_CONSTANT(DIGESTSIZE = 28)
//! \brief Construct a Keccak-224 message digest
Keccak_224() : Keccak(DIGESTSIZE) {}
CRYPTOPP_CONSTEXPR static const char *StaticAlgorithmName() {return "Keccak-224";}
};
//! \class Keccak_256
//! \brief Keccak-256 message digest
//! \since Crypto++ 5.6.4
class Keccak_256 : public Keccak
{
public:
CRYPTOPP_CONSTANT(DIGESTSIZE = 32)
//! \brief Construct a Keccak-256 message digest
Keccak_256() : Keccak(DIGESTSIZE) {}
CRYPTOPP_CONSTEXPR static const char *StaticAlgorithmName() {return "Keccak-256";}
};
//! \class Keccak_384
//! \brief Keccak-384 message digest
//! \since Crypto++ 5.6.4
class Keccak_384 : public Keccak
{
public:
CRYPTOPP_CONSTANT(DIGESTSIZE = 48)
//! \brief Construct a Keccak-384 message digest
Keccak_384() : Keccak(DIGESTSIZE) {}
CRYPTOPP_CONSTEXPR static const char *StaticAlgorithmName() {return "Keccak-384";}
};
//! \class Keccak_512
//! \brief Keccak-512 message digest
//! \since Crypto++ 5.6.4
class Keccak_512 : public Keccak
{
public:
CRYPTOPP_CONSTANT(DIGESTSIZE = 64)
//! \brief Construct a Keccak-512 message digest
Keccak_512() : Keccak(DIGESTSIZE) {}
CRYPTOPP_CONSTEXPR static const char *StaticAlgorithmName() {return "Keccak-512";}
};
NAMESPACE_END
#endif
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