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/*******************************************************************************
* Copyright 2010-2018 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:
// Intel(R) Integrated Performance Primitives. Cryptography Primitives.
// EC over GF(p) Operations
//
// Context:
// ippsGFpECTstPointInSubgroup()
//
*/
#include "owndefs.h"
#include "owncp.h"
#include "pcpgfpecstuff.h"
#include "pcphash.h"
#include "pcphash_rmf.h"
/*F*
// Name: ippsGFpECTstPointInSubgroup
//
// Purpose: Checks if a point belongs to a specified subgroup
//
// Returns: Reason:
// ippStsNullPtrErr pP == NULL
// pEC == NULL
// pResult == NULL
/ pScratchBuffer == NULL
//
// ippStsContextMatchErr invalid pEC->idCtx
// pEC->subgroup == NULL
// invalid pP->idCtx
//
// ippStsOutOfRangeErr ECP_POINT_FELEN(pP)!=GFP_FELEN()
//
// ippStsNoErr no error
//
// Parameters:
// pP Pointer to the IppsGFpECPoint context
// pEC Pointer to the context of the elliptic curve
// pResult Pointer to the result of the check
// pScratchBuffer Pointer to the scratch buffer
//
*F*/
IPPFUN(IppStatus, ippsGFpECTstPointInSubgroup,(const IppsGFpECPoint* pP,
IppECResult* pResult,
IppsGFpECState* pEC,
Ipp8u* pScratchBuffer))
{
IPP_BAD_PTR4_RET(pP, pResult, pEC, pScratchBuffer);
pEC = (IppsGFpECState*)( IPP_ALIGNED_PTR(pEC, ECGFP_ALIGNMENT) );
IPP_BADARG_RET( !ECP_TEST_ID(pEC), ippStsContextMatchErr );
IPP_BADARG_RET(!ECP_SUBGROUP(pEC), ippStsContextMatchErr);
IPP_BADARG_RET( !ECP_POINT_TEST_ID(pP), ippStsContextMatchErr );
IPP_BADARG_RET( ECP_POINT_FELEN(pP)!=GFP_FELEN(GFP_PMA(ECP_GFP(pEC))), ippStsOutOfRangeErr);
{
IppECResult tstResult;
ippsGFpECTstPoint(pP, &tstResult, pEC);
if(ippECValid==tstResult) {
IppsGFpECPoint T;
cpEcGFpInitPoint(&T, cpEcGFpGetPool(1, pEC),0, pEC);
gfec_MulPoint(&T, pP, MOD_MODULUS(ECP_MONT_R(pEC)), BITS_BNU_CHUNK(ECP_ORDBITSIZE(pEC)), /*0,*/ pEC, pScratchBuffer);
tstResult = gfec_IsPointAtInfinity(&T)? ippECValid : ippECPointOutOfGroup;
cpEcGFpReleasePool(1, pEC);
}
*pResult = tstResult;
return ippStsNoErr;
}
}
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