1 files changed, 68 insertions, 0 deletions

diff --git a/CryptoPP/vmac.h b/CryptoPP/vmac.h
new file mode 100644
index 000000000..07240173c
--- /dev/null
+++ b/CryptoPP/vmac.h
@@ -0,0 +1,68 @@
+#ifndef CRYPTOPP_VMAC_H
+#define CRYPTOPP_VMAC_H
+
+#include "iterhash.h"
+#include "seckey.h"
+
+NAMESPACE_BEGIN(CryptoPP)
+
+/// .
+class VMAC_Base : public IteratedHashBase<word64, MessageAuthenticationCode>
+{
+public:
+	std::string AlgorithmName() const {return std::string("VMAC(") + GetCipher().AlgorithmName() + ")-" + IntToString(DigestSize()*8);}
+	unsigned int IVSize() const {return GetCipher().BlockSize();}
+	unsigned int MinIVLength() const {return 1;}
+	void Resynchronize(const byte *nonce, int length=-1);
+	void GetNextIV(RandomNumberGenerator &rng, byte *IV);
+	unsigned int DigestSize() const {return m_is128 ? 16 : 8;};
+	void UncheckedSetKey(const byte *userKey, unsigned int keylength, const NameValuePairs &params);
+	void TruncatedFinal(byte *mac, size_t size);
+	unsigned int BlockSize() const {return m_L1KeyLength;}
+	ByteOrder GetByteOrder() const {return LITTLE_ENDIAN_ORDER;}
+
+protected:
+	virtual BlockCipher & AccessCipher() =0;
+	virtual int DefaultDigestSize() const =0;
+	const BlockCipher & GetCipher() const {return const_cast<VMAC_Base *>(this)->AccessCipher();}
+	void HashEndianCorrectedBlock(const word64 *data);
+	size_t HashMultipleBlocks(const word64 *input, size_t length);
+	void Init() {}
+	word64* StateBuf() {return NULL;}
+	word64* DataBuf() {return (word64 *)m_data();}
+
+	void VHASH_Update_SSE2(const word64 *data, size_t blocksRemainingInWord64, int tagPart);
+#if !(defined(_MSC_VER) && _MSC_VER < 1300)		// can't use function template here with VC6
+	template <bool T_128BitTag>
+#endif
+	void VHASH_Update_Template(const word64 *data, size_t blockRemainingInWord128);
+	void VHASH_Update(const word64 *data, size_t blocksRemainingInWord128);
+
+	CRYPTOPP_BLOCK_1(polyState, word64, 4*(m_is128+1))
+	CRYPTOPP_BLOCK_2(nhKey, word64, m_L1KeyLength/sizeof(word64) + 2*m_is128)
+	CRYPTOPP_BLOCK_3(data, byte, m_L1KeyLength)
+	CRYPTOPP_BLOCK_4(l3Key, word64, 2*(m_is128+1))
+	CRYPTOPP_BLOCK_5(nonce, byte, IVSize())
+	CRYPTOPP_BLOCK_6(pad, byte, IVSize())
+	CRYPTOPP_BLOCKS_END(6)
+
+	bool m_is128, m_padCached, m_isFirstBlock;
+	int m_L1KeyLength;
+};
+
+/// <a href="http://www.cryptolounge.org/wiki/VMAC">VMAC</a>
+template <class T_BlockCipher, int T_DigestBitSize = 128>
+class VMAC : public SimpleKeyingInterfaceImpl<VMAC_Base, SameKeyLengthAs<T_BlockCipher, SimpleKeyingInterface::UNIQUE_IV, T_BlockCipher::BLOCKSIZE> >
+{
+public:
+	static std::string StaticAlgorithmName() {return std::string("VMAC(") + T_BlockCipher::StaticAlgorithmName() + ")-" + IntToString(T_DigestBitSize);}
+
+private:
+	BlockCipher & AccessCipher() {return m_cipher;}
+	int DefaultDigestSize() const {return T_DigestBitSize/8;}
+	typename T_BlockCipher::Encryption m_cipher;
+};
+
+NAMESPACE_END
+
+#endif