ipp_cipher_arc4.cpp

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(_IPP_v51_)

#include "ipp_cipher_arc4.h"
#include <string.h>

//////////////////////////////////////////////////
//
// cipher: ARCFour
//
RC4::RC4(const Ipp8u* pKey, int keyLen)
{
   algoBlockSize = ARCFOUR_BLKLEN;

   int ctxSize;
   ippsARCFourGetSize(&ctxSize); 
   pCtx = (IppsARCFourState*)( new Ipp8u [ctxSize] );

   ResetKey(pKey, keyLen);
}

void RC4::ResetKey(const Ipp8u* pKey, int keyLen)
{
   if(keyLen > MAX_ARCFOUR_KEY_LEN)
      keyLen = MAX_ARCFOUR_KEY_LEN;

   ippsARCFourInit(pKey, keyLen, pCtx);
}

RC4::~RC4()
{
   delete [] (Ipp8u*)pCtx;
}

int RC4::doCipher(Ipp8u* pDst, const Ipp8u* pSrc, int srcLen)
{
   if(ECB!=mode)
      return 0; // unsupported mode

   status = ENCRYPT==operation?
      ippsARCFourEncrypt(pSrc, pDst, srcLen, pCtx):
      ippsARCFourDecrypt(pSrc, pDst, srcLen, pCtx);

   return ippStsNoErr==status;
}
#endif // IPP_v51_