cipher.h

这是在PCA下的基于IPP库示例代码例子,在网上下了IPP的库之后,设置相关参数就可以编译该代码.

/*
//
//               INTEL CORPORATION PROPRIETARY INFORMATION
//  This software is supplied under the terms of a license agreement or
//  nondisclosure agreement with Intel Corporation and may not be copied
//  or disclosed except in accordance with the terms of that agreement.
//        Copyright (c) 2005 Intel Corporation. All Rights Reserved.
//
*/

#if !defined( _CIPHER_H_ )
#define _CIPHER_H_

#include "ippcp.h"
#include "cipherdefs.h"


class Cipher
{
public:
   int EncryptInit(CipherMode mode=ECB, const Ipp8u* pIV=0, int parm=0)
       {return Init(ENCRYPT, mode, pIV, parm);}
   int DecryptInit(CipherMode mode=ECB, const Ipp8u* pIV=0, int parm=0)
       {return Init(DECRYPT, mode, pIV, parm);}
   
   int EncryptUpdate(Ipp8u* pDst, int* pDstLen, const Ipp8u* pSrc, int srcLen);
   int DecryptUpdate(Ipp8u* pDst, int* pDstLen, const Ipp8u* pSrc, int srcLen);
   
   virtual int EncryptFinal(Ipp8u* pDst, int* pDstLen);
   virtual int DecryptFinal(Ipp8u* pDst, int* pDstLen);
   
   virtual bool IsWeakKey(const Ipp8u* pKey, int keyLen=0) {return true;}

   void SetPadding(bool isPadding) {padding = isPadding;}

   virtual void AddPadding(void);
   virtual int TrimPadding(void);

protected:
   int Init(CipherOperation op, CipherMode m, const Ipp8u* pIV, int parm);
   virtual int doCipher(Ipp8u* pDst, const Ipp8u* pSrc, int srcLen) = 0;

public:
   IppStatus status;

protected:
   CipherOperation operation;       // i.e ENCRYPT/DECRYPT
   CipherMode      mode;            // i.e ECB/CBC/CFB/CTR/....
   int             param;           // CFB or CTR parameter 
   bool            padding;         // padding request
   int             algoBlockSize;   // algorithm specific data block size
   int             dataSgmntSize;   // input data segment size (may be different from algo)

   Ipp8u iv[MAX_BLKLEN];   // working iv

   Ipp8u ibuf[MAX_BLKLEN]; // partial block
   int   ibufLen;          // partial block infill

   Ipp8u obuf[MAX_BLKLEN]; // possible last block of decryption
   bool  obufUsed;         // obuf contains actual data
};

#endif // _CIPHER_H_