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108 lines
4.0 KiB
C++
108 lines
4.0 KiB
C++
// keccak.h - originally written and placed in the public domain by Wei Dai
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//! \file keccak.h
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//! \brief Classes for Keccak message digests
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//! \details The Crypto++ Keccak implementation uses F1600 with XOF d=0x01.
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//! FIPS 202 conformance (XOF d=0x06) is available in SHA3 classes.
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//! \details Keccak will likely change in the future to accommodate extensibility of the
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//! round function and the XOF functions.
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//! \sa <a href="http://en.wikipedia.org/wiki/Keccak">Keccak</a>
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//! \since Crypto++ 5.6.4
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#ifndef CRYPTOPP_KECCAK_H
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#define CRYPTOPP_KECCAK_H
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#include "cryptlib.h"
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#include "secblock.h"
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NAMESPACE_BEGIN(CryptoPP)
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//! \class Keccak
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//! \brief Keccak message digest base class
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//! \details The Crypto++ Keccak implementation uses F1600 with XOF d=0x01.
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//! FIPS 202 conformance (XOF d=0x06) is available in SHA3 classes.
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//! \details Keccak is the base class for Keccak_224, Keccak_256, Keccak_384 and Keccak_512.
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//! Library users should instantiate a derived class, and only use Keccak
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//! as a base class reference or pointer.
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//! \details Keccak will likely change in the future to accommodate extensibility of the
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//! round function and the XOF functions.
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//! \details Perform the following to specify a different digest size. The class will use F1600,
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//! XOF d=0x01, and a new vaue for <tt>r()</tt> (which will be <tt>200-2*24 = 152</tt>).
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//! <pre> Keccack_192 : public Keccack
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//! {
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//! public:
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//! CRYPTOPP_CONSTANT(DIGESTSIZE = 24)
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//! Keccack_192() : Keccack(DIGESTSIZE) {}
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//! };
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//! </pre>
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//!
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//! \sa SHA3, Keccak_224, Keccak_256, Keccak_384 and Keccak_512.
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//! \since Crypto++ 5.6.4
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class Keccak : public HashTransformation
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{
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public:
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//! \brief Construct a Keccak
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//! \param digestSize the digest size, in bytes
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//! \details Keccak is the base class for Keccak_224, Keccak_256, Keccak_384 and Keccak_512.
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//! Library users should instantiate a derived class, and only use Keccak
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//! as a base class reference or pointer.
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//! \since Crypto++ 5.6.4
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Keccak(unsigned int digestSize) : m_digestSize(digestSize) {Restart();}
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unsigned int DigestSize() const {return m_digestSize;}
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std::string AlgorithmName() const {return "Keccak-" + IntToString(m_digestSize*8);}
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CRYPTOPP_STATIC_CONSTEXPR const char* StaticAlgorithmName() { return "Keccak"; }
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unsigned int OptimalDataAlignment() const {return GetAlignmentOf<word64>();}
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void Update(const byte *input, size_t length);
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void Restart();
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void TruncatedFinal(byte *hash, size_t size);
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//unsigned int BlockSize() const { return r(); } // that's the idea behind it
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protected:
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inline unsigned int r() const {return 200 - 2 * m_digestSize;}
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FixedSizeSecBlock<word64, 25> m_state;
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unsigned int m_digestSize, m_counter;
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};
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//! \class Keccak_224
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//! \tparam T_DigestSize controls the digest size as a template parameter instead of a per-class constant
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//! \brief Keccak-X message digest, template for more fine-grained typedefs
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//! \since Crypto++ 6.0.0
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template<unsigned int T_DigestSize>
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class Keccak_Final : public Keccak
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{
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public:
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CRYPTOPP_CONSTANT(DIGESTSIZE = T_DigestSize)
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CRYPTOPP_CONSTANT(BLOCKSIZE = 200 - 2 * DIGESTSIZE)
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//! \brief Construct a Keccak-X message digest
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Keccak_Final() : Keccak(DIGESTSIZE) {}
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static std::string StaticAlgorithmName() { return "Keccak-" + IntToString(DIGESTSIZE * 8); }
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unsigned int BlockSize() const { return BLOCKSIZE; }
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private:
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CRYPTOPP_COMPILE_ASSERT(BLOCKSIZE < 200); // ensure there was no underflow in the math
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CRYPTOPP_COMPILE_ASSERT(BLOCKSIZE > (int)T_DigestSize); // this is a general expectation by HMAC
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};
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//! \brief Keccak-224 message digest
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//! \since Crypto++ 5.6.4
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typedef Keccak_Final<28> Keccak_224;
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//! \brief Keccak-256 message digest
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//! \since Crypto++ 5.6.4
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typedef Keccak_Final<32> Keccak_256;
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//! \brief Keccak-384 message digest
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//! \since Crypto++ 5.6.4
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typedef Keccak_Final<48> Keccak_384;
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//! \brief Keccak-512 message digest
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//! \since Crypto++ 5.6.4
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typedef Keccak_Final<64> Keccak_512;
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NAMESPACE_END
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#endif
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