ocf_cipher.cpp

来自「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」· C++ 代码 · 共 106 行

/*
//
//               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( _OCF_ )

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


//////////////////////////////////////////////////
//
// OCF cipher
//
OCFCipher::OCFCipher(AlgoName a, const u8* pKey, int keyLen)
{
   algo = a;
   algoBlockSize = CipherBlockSize(a);
   
   // get clone of crypto dev descriptor
   fd = cdevClone();
   
   if(-1 != fd) {
      int isCipher = ocfCipherEnabled(fd, a);
      int isSession = ocfOccupyCipherSession(fd, &ses, a, pKey, keyLen);
      error = !isCipher || !isSession;
   }
   else
      error = 1;
}

void OCFCipher::ResetKey(const u8* pKey, int keyLen)
{
   error = !ocfVacateCipherSession(fd, &ses)
        || !ocfOccupyCipherSession(fd, &ses, algo, pKey, keyLen);
}

OCFCipher::~OCFCipher()
{
   ocfVacateCipherSession(fd, &ses);
   cdevCloneClose(fd);
}

int OCFCipher::doCipher(u8* pDst, const u8* pSrc, int srcLen)
{
   Ipp8u newIV[MAX_BLKLEN];

   switch (mode) {
      case ECB:
         error = !ocfCipherECB(fd, &ses, operation, pDst, pSrc, srcLen);
         break;
      case CBC:
         if(DECRYPT==operation)
            memcpy(newIV, pSrc+srcLen-algoBlockSize, algoBlockSize);
         
         error = !ocfCipherCBC(fd, &ses, operation, iv, pDst, pSrc, srcLen);
            
         if(ENCRYPT==operation)
            memcpy(newIV, pDst+srcLen-algoBlockSize, algoBlockSize);
            
         if(!error)
            memcpy(iv, newIV, algoBlockSize);
         break;
      case CFB:
         if(DECRYPT==operation) {
            if(srcLen<algoBlockSize) {
               memcpy(newIV, iv+srcLen, algoBlockSize-srcLen);
               memcpy(newIV+algoBlockSize-srcLen, pSrc, srcLen);
            }
            else
               memcpy(newIV, pSrc+srcLen-algoBlockSize, algoBlockSize);
         }
         
         error = !ocfCipherCFB(fd, &ses, operation, iv, param, pDst, pSrc, srcLen);
            
         if(ENCRYPT==operation) {
            if(srcLen<algoBlockSize) {
               memcpy(newIV, iv+srcLen, algoBlockSize-srcLen);
               memcpy(newIV+algoBlockSize-srcLen, pDst, srcLen);
            }
            else
               memcpy(newIV, pDst+srcLen-algoBlockSize, algoBlockSize);
         }
            
         if(!error)
            memcpy(iv, newIV, algoBlockSize);
         break;
      case CTR:
         error = !ocfCipherCTR(fd, &ses, operation, iv, param, pDst, pSrc, srcLen);
         break;
      default:
         error = 1; // unsupported mode
         break;
   }
   return !error;
}

#endif // _OCF_