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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:
// cpDecryptSMS4_cbc()
//
*/
#include "owncp.h"
#include "pcpsms4.h"
#include "pcptool.h"
#if !defined _PCP_SMS4_DECRYPT_CBC_H
#define _PCP_SMS4_DECRYPT_CBC_H
/*F*
// Name: ippsSMS4DecryptCBC
//
// Purpose: SMS4-CBC decryption.
//
// Returns: Reason:
// ippStsNullPtrErr pCtx == NULL
// pSrc == NULL
// pDst == NULL
// pIV == NULL
// ippStsContextMatchErr !VALID_SMS4_ID()
// ippStsLengthErr len <1
// ippStsUnderRunErr 0!=(dataLen%MBS_SMS4)
// ippStsNoErr no errors
//
// Parameters:
// pSrc pointer to the source data buffer
// pDst pointer to the target data buffer
// dataLen input/output buffer length (in bytes)
// pCtx pointer to the SMS4 context
// pIV pointer to the initialization vector
//
*F*/
static void cpDecryptSMS4_cbc(const Ipp8u* pIV,
const Ipp8u* pSrc, Ipp8u* pDst, int dataLen,
const IppsSMS4Spec* pCtx)
{
const Ipp32u* pRoundKeys = SMS4_DRK(pCtx);
/* copy IV */
Ipp32u iv[MBS_SMS4/sizeof(Ipp32u)];
CopyBlock16(pIV, iv);
/* do decryption */
#if (_IPP>=_IPP_P8) || (_IPP32E>=_IPP32E_Y8)
if(IsFeatureEnabled(ippCPUID_AES)) {
int processedLen = cpSMS4_CBC_dec_aesni(pDst, pSrc, dataLen, pRoundKeys, (Ipp8u*)iv);
pSrc += processedLen;
pDst += processedLen;
dataLen -= processedLen;
}
#endif
for(; dataLen>0; dataLen-=MBS_SMS4, pSrc+=MBS_SMS4, pDst+=MBS_SMS4) {
Ipp32u tmp[MBS_SMS4/sizeof(ipp32u)];
cpSMS4_Cipher((Ipp8u*)tmp, (Ipp8u*)pSrc, pRoundKeys);
tmp[0] ^= iv[0];
tmp[1] ^= iv[1];
tmp[2] ^= iv[2];
tmp[3] ^= iv[3];
iv[0] = ((Ipp32u*)pSrc)[0];
iv[1] = ((Ipp32u*)pSrc)[1];
iv[2] = ((Ipp32u*)pSrc)[2];
iv[3] = ((Ipp32u*)pSrc)[3];
CopyBlock16(tmp, pDst);
}
}
#endif /* #if !defined _PCP_SMS4_DECRYPT_CBC_H */
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