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/*******************************************************************************
* Copyright 2003-2018 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.
// EC over Prime Finite Field (EC Point operations)
//
// Contents:
// ippsECCPGetPoint()
//
*/
#include "owndefs.h"
#include "owncp.h"
#include "pcpeccp.h"
/*F*
// Name: ippsECCPGetPoint
//
// Purpose: Converts internal presentation EC point - montgomery projective
// into regular affine coordinates EC point (pX,pY)
//
// Returns: Reason:
// ippStsNullPtrErr NULL == pEC
// NULL == pPoint
//
// ippStsContextMatchErr illegal pEC->idCtx
// illegal pPoint->idCtx
// NULL != pX, illegal pX->idCtx
// NULL != pY, illegal pY->idCtx
//
// ippStsNoErr no errors
//
// Parameters:
// pX pointer to the regular affine coordinate X
// pY pointer to the regular affine coordinate Y
// pPoint pointer to the EC Point context
// pEC pointer to the ECCP context
//
*F*/
IPPFUN(IppStatus, ippsECCPGetPoint,(IppsBigNumState* pX, IppsBigNumState* pY,
const IppsECCPPointState* pPoint,
IppsECCPState* pEC))
{
/* test pEC */
IPP_BAD_PTR1_RET(pEC);
/* use aligned EC context */
pEC = (IppsGFpECState*)( IPP_ALIGNED_PTR(pEC, ECGFP_ALIGNMENT) );
IPP_BADARG_RET(!ECP_TEST_ID(pEC), ippStsContextMatchErr);
/* test pX and pY */
if(pX) {
pX = (IppsBigNumState*)( IPP_ALIGNED_PTR(pX, ALIGN_VAL) );
IPP_BADARG_RET(!BN_VALID_ID(pX), ippStsContextMatchErr);
}
if(pY) {
pY = (IppsBigNumState*)( IPP_ALIGNED_PTR(pY, ALIGN_VAL) );
IPP_BADARG_RET(!BN_VALID_ID(pY), ippStsContextMatchErr);
}
{
IppStatus sts;
IppsGFpState* pGF = ECP_GFP(pEC);
gsModEngine* pGFE = GFP_PMA(pGF);
int elemLen = GFP_FELEN(pGFE);
mod_decode decode = GFP_METHOD(pGFE)->decode; /* gf decode method */
IppsGFpElement elmX, elmY;
cpGFpElementConstruct(&elmX, cpGFpGetPool(1, pGFE), elemLen);
cpGFpElementConstruct(&elmY, cpGFpGetPool(1, pGFE), elemLen);
do {
sts = ippsGFpECGetPoint(pPoint, pX? &elmX:NULL, pY? &elmY:NULL, pEC);
if(ippStsNoErr!=sts) break;
if(pX) {
decode(elmX.pData, elmX.pData, pGFE);
sts = ippsSet_BN(ippBigNumPOS, GFP_FELEN32(pGFE), (Ipp32u*)elmX.pData, pX);
if(ippStsNoErr!=sts) break;
}
if(pY) {
decode(elmY.pData, elmY.pData, pGFE);
sts = ippsSet_BN(ippBigNumPOS, GFP_FELEN32(pGFE), (Ipp32u*)elmY.pData, pY);
if(ippStsNoErr!=sts) break;
}
} while(0);
cpGFpReleasePool(2, pGFE);
return sts;
}
}
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