Home | History | Annotate | Download | only in ippcp 
      1 /*******************************************************************************
      2 * Copyright 2010-2018 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 //     Intel(R) Integrated Performance Primitives. Cryptography Primitives.
     43 //     EC over GF(p^m) definitinons
     44 //
     45 //     Context:
     46 //        ippsGFpECSet()
     47 //
     48 */
     49 
     50 #include "owndefs.h"
     51 #include "owncp.h"
     52 #include "pcpgfpecstuff.h"
     53 #include "pcpeccp.h"
     54 
     55 /*F*
     56 // Name: ippsGFpECSet
     57 //
     58 // Purpose: Sets up the parameters of an elliptic curve over a finite field
     59 //
     60 // Returns:                   Reason:
     61 //    ippStsNullPtrErr              NULL == pEC
     62 //                                  NULL == pA
     63 //                                  NULL == pB
     64 //
     65 //    ippStsContextMatchErr         invalid pEC->idCtx
     66 //                                  invalid pA->idCtx
     67 //                                  invalid pB->idCtx
     68 //
     69 //    ippStsOutOfRangeErr           GFPE_ROOM(pA)!=GFP_FELEN(pGFE)
     70 //                                  GFPE_ROOM(pB)!=GFP_FELEN(pGFE)
     71 //
     72 //    ippStsNoErr                   no error
     73 //
     74 // Parameters:
     75 //    pA        Pointer to the coefficient A of the equation defining the elliptic curve
     76 //    pB        Pointer to the coefficient B of the equation defining the elliptic curve
     77 //    pEC       Pointer to the context of the elliptic curve
     78 //
     79 *F*/
     80 
     81 IPPFUN(IppStatus, ippsGFpECSet,(const IppsGFpElement* pA,
     82                                 const IppsGFpElement* pB,
     83                                 IppsGFpECState* pEC))
     84 {
     85    IPP_BAD_PTR1_RET(pEC);
     86    pEC = (IppsGFpECState*)( IPP_ALIGNED_PTR(pEC, ECGFP_ALIGNMENT) );
     87    IPP_BADARG_RET( !ECP_TEST_ID(pEC), ippStsContextMatchErr );
     88 
     89    IPP_BAD_PTR2_RET(pA, pB);
     90    IPP_BADARG_RET( !GFPE_TEST_ID(pA), ippStsContextMatchErr );
     91    IPP_BADARG_RET( !GFPE_TEST_ID(pB), ippStsContextMatchErr );
     92 
     93    {
     94       gsModEngine* pGFE = GFP_PMA(ECP_GFP(pEC));
     95       int elemLen = GFP_FELEN(pGFE);
     96 
     97       IPP_BADARG_RET( GFPE_ROOM(pA)!=GFP_FELEN(pGFE), ippStsOutOfRangeErr);
     98       IPP_BADARG_RET( GFPE_ROOM(pB)!=GFP_FELEN(pGFE), ippStsOutOfRangeErr);
     99 
    100       /* copy A */
    101       cpGFpElementPadd(ECP_A(pEC), elemLen, 0);
    102       cpGFpElementCopy(ECP_A(pEC), GFPE_DATA(pA), elemLen);
    103       /* and set up A-specific (a==0 or a==-3) if is */
    104       if(GFP_IS_ZERO(ECP_A(pEC), elemLen))
    105          ECP_SPECIFIC(pEC) = ECP_EPID2;
    106 
    107       cpGFpElementSetChunk(ECP_B(pEC), elemLen, 3);
    108       GFP_METHOD(pGFE)->encode(ECP_B(pEC), ECP_B(pEC), pGFE);
    109       GFP_METHOD(pGFE)->add(ECP_B(pEC), ECP_A(pEC), ECP_B(pEC), pGFE);
    110       if(GFP_IS_ZERO(ECP_B(pEC), elemLen))
    111          ECP_SPECIFIC(pEC) = ECP_STD;
    112 
    113       /* copy B */
    114       cpGFpElementPadd(ECP_B(pEC), elemLen, 0);
    115       cpGFpElementCopy(ECP_B(pEC), GFPE_DATA(pB), elemLen);
    116       /* and set type of affine infinity representation:
    117       // (0,1) if B==0
    118       // (0,0) if B!=0 */
    119       ECP_INFINITY(pEC) = GFP_IS_ZERO(ECP_B(pEC), elemLen);
    120 
    121       return ippStsNoErr;
    122    }
    123 }
    124