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/*******************************************************************************
* Copyright 2013-2018 Intel Corporation
* All Rights Reserved.
*
* If this software was obtained under the Intel Simplified Software License,
* the following terms apply:
*
* The source code, information and material ("Material") contained herein is
* owned by Intel Corporation or its suppliers or licensors, and title to such
* Material remains with Intel Corporation or its suppliers or licensors. The
* Material contains proprietary information of Intel or its suppliers and
* licensors. The Material is protected by worldwide copyright laws and treaty
* provisions. No part of the Material may be used, copied, reproduced,
* modified, published, uploaded, posted, transmitted, distributed or disclosed
* in any way without Intel's prior express written permission. No license under
* any patent, copyright or other intellectual property rights in the Material
* is granted to or conferred upon you, either expressly, by implication,
* inducement, estoppel or otherwise. Any license under such intellectual
* property rights must be express and approved by Intel in writing.
*
* Unless otherwise agreed by Intel in writing, you may not remove or alter this
* notice or any other notice embedded in Materials by Intel or Intel's
* suppliers or licensors in any way.
*
*
* If this software was obtained under the Apache License, Version 2.0 (the
* "License"), the following terms apply:
*
* You may not use this file except in compliance with the License. You may
* obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
*
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
*
* See the License for the specific language governing permissions and
* limitations under the License.
*******************************************************************************/
/*
//
// Purpose:
// Cryptography Primitive.
// SMS4 encryption/decryption
//
// Contents:
// cpProcessSMS4_ofb8()
//
*/
#include "owncp.h"
#include "pcpsms4.h"
#include "pcptool.h"
#if !defined _PCP_SMS4_PROCESS_OFB8_H
#define _PCP_SMS4_PROCESS_OFB8_H
/*
// SMS4-OFB ecnryption/decryption
//
// Parameters:
// pSrc pointer to the source data buffer
// pDst pointer to the target data buffer
// dataLen input/output buffer length (in bytes)
// ofbBlkSize ofb block size (in bytes)
// pCtx pointer to the AES context
// pIV pointer to the initialization vector
*/
static void cpProcessSMS4_ofb8(const Ipp8u *pSrc, Ipp8u *pDst, int dataLen, int ofbBlkSize,
const IppsSMS4Spec* pCtx,
Ipp8u* pIV)
{
Ipp32u tmpInpOut[2*MBS_SMS4/sizeof(Ipp32u)];
CopyBlock16(pIV, tmpInpOut);
while(dataLen>=ofbBlkSize) {
/* block-by-block processing */
cpSMS4_Cipher((Ipp8u*)tmpInpOut+MBS_SMS4, (Ipp8u*)tmpInpOut, SMS4_RK(pCtx));
/* store output and shift inpBuffer for the next OFB operation */
if(ofbBlkSize==MBS_SMS4) {
((Ipp32u*)pDst)[0] = tmpInpOut[0+MBS_SMS4/sizeof(Ipp32u)]^((Ipp32u*)pSrc)[0];
((Ipp32u*)pDst)[1] = tmpInpOut[1+MBS_SMS4/sizeof(Ipp32u)]^((Ipp32u*)pSrc)[1];
((Ipp32u*)pDst)[2] = tmpInpOut[2+MBS_SMS4/sizeof(Ipp32u)]^((Ipp32u*)pSrc)[2];
((Ipp32u*)pDst)[3] = tmpInpOut[3+MBS_SMS4/sizeof(Ipp32u)]^((Ipp32u*)pSrc)[3];
tmpInpOut[0] = tmpInpOut[0+MBS_SMS4/sizeof(Ipp32u)];
tmpInpOut[1] = tmpInpOut[1+MBS_SMS4/sizeof(Ipp32u)];
tmpInpOut[2] = tmpInpOut[2+MBS_SMS4/sizeof(Ipp32u)];
tmpInpOut[3] = tmpInpOut[3+MBS_SMS4/sizeof(Ipp32u)];
}
else {
XorBlock(pSrc, tmpInpOut+MBS_SMS4/sizeof(Ipp32u), pDst, ofbBlkSize);
CopyBlock16((Ipp8u*)tmpInpOut+ofbBlkSize, tmpInpOut);
}
pSrc += ofbBlkSize;
pDst += ofbBlkSize;
dataLen -= ofbBlkSize;
}
/* update pIV */
CopyBlock16((Ipp8u*)tmpInpOut, pIV);
}
#endif /* #if !defined _PCP_SMS4_PROCESS_OFB8_H */
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