1#ifndef CRYPTOPP_VMAC_H 2#define CRYPTOPP_VMAC_H 3 4#include "iterhash.h" 5#include "seckey.h" 6 7NAMESPACE_BEGIN(CryptoPP) 8 9/// . 10class VMAC_Base : public IteratedHashBase<word64, MessageAuthenticationCode> 11{ 12public: 13 std::string AlgorithmName() const {return std::string("VMAC(") + GetCipher().AlgorithmName() + ")-" + IntToString(DigestSize()*8);} 14 unsigned int IVSize() const {return GetCipher().BlockSize();} 15 unsigned int MinIVLength() const {return 1;} 16 void Resynchronize(const byte *nonce, int length=-1); 17 void GetNextIV(RandomNumberGenerator &rng, byte *IV); 18 unsigned int DigestSize() const {return m_is128 ? 16 : 8;}; 19 void UncheckedSetKey(const byte *userKey, unsigned int keylength, const NameValuePairs ¶ms); 20 void TruncatedFinal(byte *mac, size_t size); 21 unsigned int BlockSize() const {return m_L1KeyLength;} 22 ByteOrder GetByteOrder() const {return LITTLE_ENDIAN_ORDER;} 23 24protected: 25 virtual BlockCipher & AccessCipher() =0; 26 virtual int DefaultDigestSize() const =0; 27 const BlockCipher & GetCipher() const {return const_cast<VMAC_Base *>(this)->AccessCipher();} 28 void HashEndianCorrectedBlock(const word64 *data); 29 size_t HashMultipleBlocks(const word64 *input, size_t length); 30 void Init() {} 31 word64* StateBuf() {return NULL;} 32 word64* DataBuf() {return (word64 *)m_data();} 33 34 void VHASH_Update_SSE2(const word64 *data, size_t blocksRemainingInWord64, int tagPart); 35#if !(defined(_MSC_VER) && _MSC_VER < 1300) // can't use function template here with VC6 36 template <bool T_128BitTag> 37#endif 38 void VHASH_Update_Template(const word64 *data, size_t blockRemainingInWord128); 39 void VHASH_Update(const word64 *data, size_t blocksRemainingInWord128); 40 41 CRYPTOPP_BLOCK_1(polyState, word64, 4*(m_is128+1)) 42 CRYPTOPP_BLOCK_2(nhKey, word64, m_L1KeyLength/sizeof(word64) + 2*m_is128) 43 CRYPTOPP_BLOCK_3(data, byte, m_L1KeyLength) 44 CRYPTOPP_BLOCK_4(l3Key, word64, 2*(m_is128+1)) 45 CRYPTOPP_BLOCK_5(nonce, byte, IVSize()) 46 CRYPTOPP_BLOCK_6(pad, byte, IVSize()) 47 CRYPTOPP_BLOCKS_END(6) 48 49 bool m_is128, m_padCached, m_isFirstBlock; 50 int m_L1KeyLength; 51}; 52 53/// <a href="http://www.cryptolounge.org/wiki/VMAC">VMAC</a> 54template <class T_BlockCipher, int T_DigestBitSize = 128> 55class VMAC : public SimpleKeyingInterfaceImpl<VMAC_Base, SameKeyLengthAs<T_BlockCipher, SimpleKeyingInterface::UNIQUE_IV, T_BlockCipher::BLOCKSIZE> > 56{ 57public: 58 static std::string StaticAlgorithmName() {return std::string("VMAC(") + T_BlockCipher::StaticAlgorithmName() + ")-" + IntToString(T_DigestBitSize);} 59 60private: 61 BlockCipher & AccessCipher() {return m_cipher;} 62 int DefaultDigestSize() const {return T_DigestBitSize/8;} 63 typename T_BlockCipher::Encryption m_cipher; 64}; 65 66NAMESPACE_END 67 68#endif 69