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107 lines
3.7 KiB
C++
107 lines
3.7 KiB
C++
// sha3.h - originally written and placed in the public domain by Wei Dai
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/// \file sha3.h
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/// \brief Classes for SHA3 message digests
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/// \details The Crypto++ implementation conforms to the FIPS 202 version of SHA3 using F1600 with XOF d=0x06.
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/// Previous behavior (XOF d=0x01) is available in Keccak classes.
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/// \sa <a href="http://en.wikipedia.org/wiki/SHA-3">SHA-3</a>,
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/// <A HREF="http://csrc.nist.gov/groups/ST/hash/sha-3/fips202_standard_2015.html">SHA-3 STANDARD (FIPS 202)</A>.
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/// \since Crypto++ 5.6.2
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#ifndef CRYPTOPP_SHA3_H
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#define CRYPTOPP_SHA3_H
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#include "cryptlib.h"
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#include "secblock.h"
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#include "misc.h"
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NAMESPACE_BEGIN(CryptoPP)
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/// \brief SHA3 message digest base class
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/// \details The Crypto++ implementation conforms to FIPS 202 version of SHA3 using F1600 with XOF d=0x06.
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/// Previous behavior (XOF d=0x01) is available in Keccak classes.
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/// \details SHA3 is the base class for SHA3_224, SHA3_256, SHA3_384 and SHA3_512.
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/// Library users should instantiate a derived class, and only use SHA3
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/// as a base class reference or pointer.
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/// \sa Keccak, SHA3_224, SHA3_256, SHA3_384 and SHA3_512.
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/// \since Crypto++ 5.6.2
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class SHA3 : public HashTransformation
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{
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protected:
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/// \brief Construct a SHA3
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/// \param digestSize the digest size, in bytes
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/// \details SHA3 is the base class for SHA3_224, SHA3_256, SHA3_384 and SHA3_512.
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/// Library users should instantiate a derived class, and only use SHA3
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/// as a base class reference or pointer.
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/// \details This constructor was moved to protected at Crypto++ 8.1
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/// because users were attempting to create Keccak objects with it.
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/// \since Crypto++ 5.6.2
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SHA3(unsigned int digestSize) : m_digestSize(digestSize) {Restart();}
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public:
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unsigned int DigestSize() const {return m_digestSize;}
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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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protected:
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inline unsigned int r() const {return BlockSize();}
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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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/// \brief SHA3 message digest template
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/// \tparam T_DigestSize the size of the digest, in bytes
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/// \since Crypto++ 5.6.2
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template<unsigned int T_DigestSize>
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class SHA3_Final : public SHA3
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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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static std::string StaticAlgorithmName()
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{ return "SHA3-" + IntToString(DIGESTSIZE * 8); }
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/// \brief Construct a SHA3-X message digest
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SHA3_Final() : SHA3(DIGESTSIZE) {}
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/// \brief Provides the block size of the compression function
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/// \return block size of the compression function, in bytes
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/// \details BlockSize() will return 0 if the hash is not block based
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/// or does not have an equivalent block size. For example, Keccak
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/// and SHA-3 do not have a block size, but they do have an equivalent
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/// block size called rate expressed as <tt>r</tt>.
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unsigned int BlockSize() const { return BLOCKSIZE; }
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std::string AlgorithmName() const { return StaticAlgorithmName(); }
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private:
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#if !defined(__BORLANDC__)
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// ensure there was no underflow in the math
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CRYPTOPP_COMPILE_ASSERT(BLOCKSIZE < 200);
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#endif
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};
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/// \brief SHA3-224 message digest
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/// \since Crypto++ 5.6.2
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class SHA3_224 : public SHA3_Final<28> {};
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/// \brief SHA3-256 message digest
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/// \since Crypto++ 5.6.2
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class SHA3_256 : public SHA3_Final<32> {};
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/// \brief SHA3-384 message digest
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/// \since Crypto++ 5.6.2
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class SHA3_384 : public SHA3_Final<48> {};
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/// \brief SHA3-512 message digest
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/// \since Crypto++ 5.6.2
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class SHA3_512 : public SHA3_Final<64> {};
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NAMESPACE_END
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#endif
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