Crypto++
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00001 #ifndef CRYPTOPP_VMAC_H 00002 #define CRYPTOPP_VMAC_H 00003 00004 #include "iterhash.h" 00005 #include "seckey.h" 00006 00007 NAMESPACE_BEGIN(CryptoPP) 00008 00009 /// . 00010 class VMAC_Base : public IteratedHashBase<word64, MessageAuthenticationCode> 00011 { 00012 public: 00013 std::string AlgorithmName() const {return std::string("VMAC(") + GetCipher().AlgorithmName() + ")-" + IntToString(DigestSize()*8);} 00014 unsigned int IVSize() const {return GetCipher().BlockSize();} 00015 unsigned int MinIVLength() const {return 1;} 00016 void Resynchronize(const byte *nonce, int length=-1); 00017 void GetNextIV(RandomNumberGenerator &rng, byte *IV); 00018 unsigned int DigestSize() const {return m_is128 ? 16 : 8;}; 00019 void UncheckedSetKey(const byte *userKey, unsigned int keylength, const NameValuePairs ¶ms); 00020 void TruncatedFinal(byte *mac, size_t size); 00021 unsigned int BlockSize() const {return m_L1KeyLength;} 00022 ByteOrder GetByteOrder() const {return LITTLE_ENDIAN_ORDER;} 00023 00024 protected: 00025 virtual BlockCipher & AccessCipher() =0; 00026 virtual int DefaultDigestSize() const =0; 00027 const BlockCipher & GetCipher() const {return const_cast<VMAC_Base *>(this)->AccessCipher();} 00028 void HashEndianCorrectedBlock(const word64 *data); 00029 size_t HashMultipleBlocks(const word64 *input, size_t length); 00030 void Init() {} 00031 word64* StateBuf() {return NULL;} 00032 word64* DataBuf() {return (word64 *)m_data();} 00033 00034 void VHASH_Update_SSE2(const word64 *data, size_t blocksRemainingInWord64, int tagPart); 00035 #if !(defined(_MSC_VER) && _MSC_VER < 1300) // can't use function template here with VC6 00036 template <bool T_128BitTag> 00037 #endif 00038 void VHASH_Update_Template(const word64 *data, size_t blockRemainingInWord128); 00039 void VHASH_Update(const word64 *data, size_t blocksRemainingInWord128); 00040 00041 CRYPTOPP_BLOCK_1(polyState, word64, 4*(m_is128+1)) 00042 CRYPTOPP_BLOCK_2(nhKey, word64, m_L1KeyLength/sizeof(word64) + 2*m_is128) 00043 CRYPTOPP_BLOCK_3(data, byte, m_L1KeyLength) 00044 CRYPTOPP_BLOCK_4(l3Key, word64, 2*(m_is128+1)) 00045 CRYPTOPP_BLOCK_5(nonce, byte, IVSize()) 00046 CRYPTOPP_BLOCK_6(pad, byte, IVSize()) 00047 CRYPTOPP_BLOCKS_END(6) 00048 00049 bool m_is128, m_padCached, m_isFirstBlock; 00050 int m_L1KeyLength; 00051 }; 00052 00053 /// <a href="http://www.cryptolounge.org/wiki/VMAC">VMAC</a> 00054 template <class T_BlockCipher, int T_DigestBitSize = 128> 00055 class VMAC : public SimpleKeyingInterfaceImpl<VMAC_Base, SameKeyLengthAs<T_BlockCipher, SimpleKeyingInterface::UNIQUE_IV, T_BlockCipher::BLOCKSIZE> > 00056 { 00057 public: 00058 static std::string StaticAlgorithmName() {return std::string("VMAC(") + T_BlockCipher::StaticAlgorithmName() + ")-" + IntToString(T_DigestBitSize);} 00059 00060 private: 00061 BlockCipher & AccessCipher() {return m_cipher;} 00062 int DefaultDigestSize() const {return T_DigestBitSize/8;} 00063 typename T_BlockCipher::Encryption m_cipher; 00064 }; 00065 00066 NAMESPACE_END 00067 00068 #endif