ccipher.h

PGP8.0源码 请认真阅读您的文件包然后写出其具体功能

/*____________________________________________________________________________
		Copyright (C) 2002 PGP Corporation
        All rights reserved.

        $Id: CCipher.h,v 1.4 2002/08/06 20:10:19 dallen Exp $
____________________________________________________________________________*/

#ifndef Included_CCipher_h	// [
#define Included_CCipher_h

#include "CErrorState.h"
#include "Crypto.h"

_PGP_BEGIN

class CCipher SMART_ERROR_INHERIT
{
public:
	CCipher(PGPdiskEncryptionAlgorithm algorithm) : mAlgorithm(algorithm) { }

	virtual ~CCipher() = 0 { }

	virtual PGPBoolean	IsKeyAttached() const = 0;

	virtual const Crypto::SymmetricKey&		Key() const = 0;
	virtual const Crypto::PassphraseSalt&	Salt() const = 0;

	PGPdiskEncryptionAlgorithm	Algorithm() const {return mAlgorithm;}

	virtual PGPUInt32	SizeExportedCipher() const = 0;
	virtual PGPUInt16	NumKeyBits() const = 0;
	virtual PGPUInt16	NumKeyBytes() const = 0;
	virtual PGPUInt16	NumEncryptBytes() const = 0;
	virtual PGPUInt16	NumDecryptBytes() const = 0;
	virtual PGPUInt16	NumSaltBytes() const = 0;
	virtual PGPUInt16	NumIvsNeeded() const = 0;

	virtual SMART_ERROR	Validate() const = 0;

	virtual void	AttachKey(const Crypto::SymmetricKey& key, 
		const Crypto::PassphraseSalt& salt) = 0;
	virtual void	FlipKeyBytes() = 0;

	virtual void	Encrypt(const void *in, void *out, 
		PGPUInt32 numBlocks = 1) const = 0;
	virtual void	Decrypt(const void *in, void *out, 
		PGPUInt32 numBlocks = 1) const = 0;

	virtual void	EncryptCFBdbl(PGPUInt32 ivs[], const PGPUInt32 *src, 
		PGPUInt32 *dest, PGPUInt32 len) const = 0;
	virtual void	DecryptCFBdbl(PGPUInt32 ivs[], const PGPUInt32 *src, 
		PGPUInt32 *dest, PGPUInt32 len) const = 0;

	virtual SMART_ERROR	ExportCipher(void *buffer, 
		PGPUInt32 sizeBuffer) const = 0;
	virtual SMART_ERROR	ImportCipher(const void *buffer, 
		PGPUInt32 sizeBuffer) = 0;

private:
	PGPdiskEncryptionAlgorithm	mAlgorithm;
};

_PGP_END

#endif	// ] Included_CCipher_h