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#ifndef CRYPTOPP_IDEA_H
#define CRYPTOPP_IDEA_H
/** \file
*/
#include "seckey.h"
#include "secblock.h"
NAMESPACE_BEGIN(CryptoPP)
//! _
struct IDEA_Info : public FixedBlockSize<8>, public FixedKeyLength<16>, public FixedRounds<8>
{
static const char *StaticAlgorithmName() {return "IDEA";}
};
/// <a href="http://www.weidai.com/scan-mirror/cs.html#IDEA">IDEA</a>
class IDEA : public IDEA_Info, public BlockCipherDocumentation
{
public: // made public for internal purposes
#ifdef CRYPTOPP_NATIVE_DWORD_AVAILABLE
typedef word Word;
#else
typedef hword Word;
#endif
private:
class CRYPTOPP_NO_VTABLE Base : public BlockCipherImpl<IDEA_Info>
{
public:
unsigned int GetAlignment() const {return 2;}
void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const;
void UncheckedSetKey(const byte *userKey, unsigned int length, const NameValuePairs ¶ms);
private:
void EnKey(const byte *);
void DeKey();
FixedSizeSecBlock<Word, 6*ROUNDS+4> m_key;
#ifdef IDEA_LARGECACHE
static inline void LookupMUL(word &a, word b);
void LookupKeyLogs();
static void BuildLogTables();
static bool tablesBuilt;
static word16 log[0x10000], antilog[0x10000];
#endif
};
public:
typedef BlockCipherFinal<ENCRYPTION, Base> Encryption;
typedef BlockCipherFinal<DECRYPTION, Base> Decryption;
};
typedef IDEA::Encryption IDEAEncryption;
typedef IDEA::Decryption IDEADecryption;
NAMESPACE_END
#endif
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