mdc.h

伯克利做的SFTP安全文件传输协议

 // mdc.h - written and placed in the public domain by Wei Dai

#ifndef MDC_H
#define MDC_H

#include "cryptlib.h"
#include "misc.h"

template <class T> class MDC : public BlockTransformation
{
public:
	enum {KEYLENGTH=T::DATASIZE, BLOCKSIZE=T::DIGESTSIZE};

	MDC(const byte *userKey)
		: key(KEYLENGTH/4)
	{
		T::CorrectEndianess(key, (word32 *)userKey, KEYLENGTH);
	}

	void ProcessBlock(byte *inoutBlock)
	{
		T::CorrectEndianess((word32 *)inoutBlock, (word32 *)inoutBlock, BLOCKSIZE);
		T::Transform((word32 *)inoutBlock, key);
		T::CorrectEndianess((word32 *)inoutBlock, (word32 *)inoutBlock, BLOCKSIZE);
	}

	void ProcessBlock(const byte *inBlock, byte *outBlock)
	{
		T::CorrectEndianess((word32 *)outBlock, (word32 *)inBlock, BLOCKSIZE);
		T::Transform((word32 *)outBlock, key);
		T::CorrectEndianess((word32 *)outBlock, (word32 *)outBlock, BLOCKSIZE);
	}

	unsigned int BlockSize() const {return BLOCKSIZE;}

private:
	SecBlock<word32> key;
};

#endif