iterhash.h

伯克利做的SFTP安全文件传输协议

#ifndef ITERHASH_H
#define ITERHASH_H

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

/* The following classes are explicitly instantiated in iterhash.cpp

	IteratedHash<word32>
	IteratedHash<word64>	// #ifdef WORD64_AVAILABLE
*/

template <class T> class IteratedHash : public virtual HashModule
{
public:
	IteratedHash(unsigned int blockSize, unsigned int digestSize);
	~IteratedHash();
	void Update(const byte *input, unsigned int length);

	typedef T HashWordType;

protected:
	void PadLastBlock(unsigned int lastBlockSize, byte padFirst=0x80);
	virtual void Init() =0;
	virtual void HashBlock(const T *input) =0;

	unsigned int blockSize;
	word32 countLo, countHi;	// 64-bit bit count
	SecBlock<T> data;			// Data buffer
	SecBlock<T> digest;			// Message digest
};

// SM: instantiation problems...
#include "iterhash.cpp"    // VC can't compile .cc

#endif