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
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
