Home | History | Annotate | Download | only in ippcp 
      1 /*******************************************************************************
      2 * Copyright 2013-2018 Intel Corporation
      3 * All Rights Reserved.
      4 *
      5 * If this  software was obtained  under the  Intel Simplified  Software License,
      6 * the following terms apply:
      7 *
      8 * The source code,  information  and material  ("Material") contained  herein is
      9 * owned by Intel Corporation or its  suppliers or licensors,  and  title to such
     10 * Material remains with Intel  Corporation or its  suppliers or  licensors.  The
     11 * Material  contains  proprietary  information  of  Intel or  its suppliers  and
     12 * licensors.  The Material is protected by  worldwide copyright  laws and treaty
     13 * provisions.  No part  of  the  Material   may  be  used,  copied,  reproduced,
     14 * modified, published,  uploaded, posted, transmitted,  distributed or disclosed
     15 * in any way without Intel's prior express written permission.  No license under
     16 * any patent,  copyright or other  intellectual property rights  in the Material
     17 * is granted to  or  conferred  upon  you,  either   expressly,  by implication,
     18 * inducement,  estoppel  or  otherwise.  Any  license   under such  intellectual
     19 * property rights must be express and approved by Intel in writing.
     20 *
     21 * Unless otherwise agreed by Intel in writing,  you may not remove or alter this
     22 * notice or  any  other  notice   embedded  in  Materials  by  Intel  or Intel's
     23 * suppliers or licensors in any way.
     24 *
     25 *
     26 * If this  software  was obtained  under the  Apache License,  Version  2.0 (the
     27 * "License"), the following terms apply:
     28 *
     29 * You may  not use this  file except  in compliance  with  the License.  You may
     30 * obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
     31 *
     32 *
     33 * Unless  required  by   applicable  law  or  agreed  to  in  writing,  software
     34 * distributed under the License  is distributed  on an  "AS IS"  BASIS,  WITHOUT
     35 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     36 *
     37 * See the   License  for the   specific  language   governing   permissions  and
     38 * limitations under the License.
     39 *******************************************************************************/
     40 
     41 /*
     42 //
     43 //  Purpose:
     44 //     Cryptography Primitive.
     45 //     SMS4 encryption/decryption
     46 //
     47 //  Contents:
     48 //        cpDecryptSMS4_cbc()
     49 //
     50 */
     51 
     52 #include "owncp.h"
     53 #include "pcpsms4.h"
     54 #include "pcptool.h"
     55 
     56 #if !defined _PCP_SMS4_DECRYPT_CBC_H
     57 #define _PCP_SMS4_DECRYPT_CBC_H
     58 
     59 /*F*
     60 //    Name: ippsSMS4DecryptCBC
     61 //
     62 // Purpose: SMS4-CBC decryption.
     63 //
     64 // Returns:                Reason:
     65 //    ippStsNullPtrErr        pCtx == NULL
     66 //                            pSrc == NULL
     67 //                            pDst == NULL
     68 //                            pIV  == NULL
     69 //    ippStsContextMatchErr   !VALID_SMS4_ID()
     70 //    ippStsLengthErr         len <1
     71 //    ippStsUnderRunErr       0!=(dataLen%MBS_SMS4)
     72 //    ippStsNoErr             no errors
     73 //
     74 // Parameters:
     75 //    pSrc        pointer to the source data buffer
     76 //    pDst        pointer to the target data buffer
     77 //    dataLen     input/output buffer length (in bytes)
     78 //    pCtx        pointer to the SMS4 context
     79 //    pIV         pointer to the initialization vector
     80 //
     81 *F*/
     82 static void cpDecryptSMS4_cbc(const Ipp8u* pIV,
     83                               const Ipp8u* pSrc, Ipp8u* pDst, int dataLen,
     84                               const IppsSMS4Spec* pCtx)
     85 {
     86    const Ipp32u* pRoundKeys = SMS4_DRK(pCtx);
     87 
     88    /* copy IV */
     89    Ipp32u iv[MBS_SMS4/sizeof(Ipp32u)];
     90    CopyBlock16(pIV, iv);
     91 
     92    /* do decryption */
     93    #if (_IPP>=_IPP_P8) || (_IPP32E>=_IPP32E_Y8)
     94    if(IsFeatureEnabled(ippCPUID_AES)) {
     95       int processedLen = cpSMS4_CBC_dec_aesni(pDst, pSrc, dataLen, pRoundKeys, (Ipp8u*)iv);
     96       pSrc += processedLen;
     97       pDst += processedLen;
     98       dataLen -= processedLen;
     99    }
    100    #endif
    101 
    102    for(; dataLen>0; dataLen-=MBS_SMS4, pSrc+=MBS_SMS4, pDst+=MBS_SMS4) {
    103       Ipp32u tmp[MBS_SMS4/sizeof(ipp32u)];
    104 
    105       cpSMS4_Cipher((Ipp8u*)tmp, (Ipp8u*)pSrc, pRoundKeys);
    106 
    107       tmp[0] ^= iv[0];
    108       tmp[1] ^= iv[1];
    109       tmp[2] ^= iv[2];
    110       tmp[3] ^= iv[3];
    111 
    112       iv[0] = ((Ipp32u*)pSrc)[0];
    113       iv[1] = ((Ipp32u*)pSrc)[1];
    114       iv[2] = ((Ipp32u*)pSrc)[2];
    115       iv[3] = ((Ipp32u*)pSrc)[3];
    116 
    117       CopyBlock16(tmp, pDst);
    118    }
    119 }
    120 
    121 #endif /* #if !defined _PCP_SMS4_DECRYPT_CBC_H */
    122