cast.h

来自「各种加密算法的集合」· C头文件 代码 · 共 50 行

#ifndef CRYPTOPP_CAST_H 
#define CRYPTOPP_CAST_H 
 
#include "cryptlib.h" 
#include "misc.h" 
 
NAMESPACE_BEGIN(CryptoPP) 
 
class CAST128 : public BlockTransformation 
{ 
public: 
	enum {KEYLENGTH=16, BLOCKSIZE=8}; 
	unsigned int BlockSize() const {return BLOCKSIZE;} 
 
protected: 
	// keylength should be between 5 and 16 
	CAST128(const byte *userKey, unsigned int keylength); 
 
	static const word32 S[8][256]; 
 
	bool reduced; 
	SecBlock<word32> K; 
}; 
 
class CAST128Encryption : public CAST128 
{ 
public: 
	CAST128Encryption(const byte *userKey, unsigned int keylength=KEYLENGTH) 
		: CAST128(userKey, keylength) {} 
 
	void ProcessBlock(const byte *inBlock, byte * outBlock) const; 
	void ProcessBlock(byte * inoutBlock) const 
		{CAST128Encryption::ProcessBlock(inoutBlock, inoutBlock);} 
}; 
 
class CAST128Decryption : public CAST128 
{ 
public: 
	CAST128Decryption(const byte *userKey, unsigned int keylength=KEYLENGTH) 
		: CAST128(userKey, keylength) {} 
 
	void ProcessBlock(const byte *inBlock, byte * outBlock) const; 
	void ProcessBlock(byte * inoutBlock) const 
		{CAST128Decryption::ProcessBlock(inoutBlock, inoutBlock);} 
}; 
 
NAMESPACE_END 
 
#endif