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92 lines
3.8 KiB
C++
92 lines
3.8 KiB
C++
// vmac.h - originally written and placed in the public domain by Wei Dai
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/// \file vmac.h
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/// \brief Classes for the VMAC message authentication code
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/// \since Crypto++ 5.5
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#ifndef CRYPTOPP_VMAC_H
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#define CRYPTOPP_VMAC_H
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#include "cryptlib.h"
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#include "iterhash.h"
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#include "seckey.h"
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// Clang 3.3 integrated assembler crash on Linux. Clang 3.4 due to compiler
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// error with .intel_syntax, http://llvm.org/bugs/show_bug.cgi?id=24232
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#if CRYPTOPP_BOOL_X32 || defined(CRYPTOPP_DISABLE_MIXED_ASM)
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# define CRYPTOPP_DISABLE_VMAC_ASM 1
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#endif
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NAMESPACE_BEGIN(CryptoPP)
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/// \brief VMAC message authentication code base class
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/// \since Crypto++ 5.5
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class VMAC_Base : public IteratedHashBase<word64, MessageAuthenticationCode>
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{
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public:
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std::string AlgorithmName() const {return std::string("VMAC(") + GetCipher().AlgorithmName() + ")-" + IntToString(DigestSize()*8);}
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std::string AlgorithmProvider() const {return GetCipher().AlgorithmProvider();}
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unsigned int IVSize() const {return GetCipher().BlockSize();}
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unsigned int MinIVLength() const {return 1;}
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void Resynchronize(const byte *nonce, int length=-1);
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void GetNextIV(RandomNumberGenerator &rng, byte *IV);
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unsigned int DigestSize() const {return m_is128 ? 16 : 8;};
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void UncheckedSetKey(const byte *userKey, unsigned int keylength, const NameValuePairs ¶ms);
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void TruncatedFinal(byte *mac, size_t size);
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unsigned int BlockSize() const {return m_L1KeyLength;}
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ByteOrder GetByteOrder() const {return LITTLE_ENDIAN_ORDER;}
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unsigned int OptimalDataAlignment() const;
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protected:
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virtual BlockCipher & AccessCipher() =0;
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virtual int DefaultDigestSize() const =0;
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const BlockCipher & GetCipher() const {return const_cast<VMAC_Base *>(this)->AccessCipher();}
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void HashEndianCorrectedBlock(const word64 *data);
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size_t HashMultipleBlocks(const word64 *input, size_t length);
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void Init() {}
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word64* StateBuf() {return NULLPTR;}
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word64* DataBuf() {return (word64 *)(void*)m_data();}
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void VHASH_Update_SSE2(const word64 *data, size_t blocksRemainingInWord64, int tagPart);
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template <bool T_128BitTag>
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void VHASH_Update_Template(const word64 *data, size_t blockRemainingInWord128);
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void VHASH_Update(const word64 *data, size_t blocksRemainingInWord128);
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CRYPTOPP_BLOCK_1(polyState, word64, 4*(m_is128+1))
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CRYPTOPP_BLOCK_2(nhKey, word64, m_L1KeyLength/sizeof(word64) + 2*m_is128)
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CRYPTOPP_BLOCK_3(data, byte, m_L1KeyLength)
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CRYPTOPP_BLOCK_4(l3Key, word64, 2*(m_is128+1))
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CRYPTOPP_BLOCK_5(nonce, byte, IVSize())
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CRYPTOPP_BLOCK_6(pad, byte, IVSize())
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CRYPTOPP_BLOCKS_END(6)
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bool m_is128, m_padCached, m_isFirstBlock;
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unsigned int m_L1KeyLength;
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};
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/// \brief VMAC message authentication code
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/// \tparam T_BlockCipher block cipher
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/// \tparam T_DigestBitSize digest size, in bits
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/// \details VMAC is a block cipher-based message authentication code algorithm
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/// using a universal hash proposed by Ted Krovetz and Wei Dai in April 2007. The
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/// algorithm was designed for high performance backed by a formal analysis.
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/// \details The implementation is based on Ted Krovetz's public domain vmac.c
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/// and <a href="http://tools.ietf.org/html/draft-krovetz-vmac-01">draft-krovetz-vmac-01.txt</a>.
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/// \sa <a href="http://www.cryptolounge.org/wiki/VMAC">VMAC</a>.
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/// \since Crypto++ 5.5
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template <class T_BlockCipher, int T_DigestBitSize = 128>
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class VMAC : public SimpleKeyingInterfaceImpl<VMAC_Base, SameKeyLengthAs<T_BlockCipher, SimpleKeyingInterface::UNIQUE_IV, T_BlockCipher::BLOCKSIZE> >
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{
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public:
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static std::string StaticAlgorithmName() {return std::string("VMAC(") + T_BlockCipher::StaticAlgorithmName() + ")-" + IntToString(T_DigestBitSize);}
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private:
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BlockCipher & AccessCipher() {return m_cipher;}
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int DefaultDigestSize() const {return T_DigestBitSize/8;}
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typename T_BlockCipher::Encryption m_cipher;
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};
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NAMESPACE_END
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#endif
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