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- /*
- * Copyright (C) 2016 Intel Corporation. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * * Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- * * Neither the name of Intel Corporation nor the names of its
- * contributors may be used to endorse or promote products derived
- * from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- */
- #include "owndefs.h"
- #include "owncp.h"
- #include "pcpeccp.h"
- #include "pcpeccppoint.h"
- #include "pcpeccpmethod.h"
- #include "pcpeccpmethodcom.h"
- /*F*
- // Name: ippsECCPSharedSecretDH
- //
- // Purpose: Shared Secret Value Derivation
- // (Diffie-Hellman version).
- //
- // Returns: Reason:
- // ippStsNullPtrErr NULL == pECC
- // NULL == pPrivateA
- // NULL == pPublicB
- // NULL == pShare
- //
- // ippStsContextMatchErr illegal pECC->idCtx
- // illegal pPrivateA->idCtx
- // illegal pPublicB->idCtx
- // illegal pShare->idCtx
- //
- // ippStsRangeErr not enough room for share key
- //
- // ippStsShareKeyErr (infinity) => z
- //
- // ippStsNoErr no errors
- //
- // Parameters:
- // pPrivateA pointer to own private key
- // pPublicB pointer to alien public key
- // pShare pointer to the shareds secret value
- // pECC pointer to the ECCP context
- //
- *F*/
- IPPFUN(IppStatus, ippsECCPSharedSecretDH,(const IppsBigNumState* pPrivateA,
- const IppsECCPPointState* pPublicB,
- IppsBigNumState* pShare,
- IppsECCPState* pECC))
- {
- /* test pECC */
- IPP_BAD_PTR1_RET(pECC);
- /* use aligned EC context */
- pECC = (IppsECCPState*)( IPP_ALIGNED_PTR(pECC, ALIGN_VAL) );
- /* test ID */
- IPP_BADARG_RET(!ECP_VALID_ID(pECC), ippStsContextMatchErr);
- /* test private (own) key */
- IPP_BAD_PTR1_RET(pPrivateA);
- pPrivateA = (IppsBigNumState*)( IPP_ALIGNED_PTR(pPrivateA, ALIGN_VAL) );
- IPP_BADARG_RET(!BN_VALID_ID(pPrivateA), ippStsContextMatchErr);
- /* test public (other party) key */
- IPP_BAD_PTR1_RET(pPublicB);
- pPublicB = (IppsECCPPointState*)( IPP_ALIGNED_PTR(pPublicB, ALIGN_VAL) );
- IPP_BADARG_RET(!ECP_POINT_VALID_ID(pPublicB), ippStsContextMatchErr);
- /* test share secret value */
- IPP_BAD_PTR1_RET(pShare);
- pShare = (IppsBigNumState*)( IPP_ALIGNED_PTR(pShare, ALIGN_VAL) );
- IPP_BADARG_RET(!BN_VALID_ID(pShare), ippStsContextMatchErr);
- IPP_BADARG_RET((BN_ROOM(pShare)*BITSIZE(BNU_CHUNK_T)<ECP_GFEBITS(pECC)), ippStsRangeErr);
- {
- BigNumNode* pList = ECP_BNCTX(pECC);
- IppsECCPPointState Tmp;
- ECP_POINT_X(&Tmp) = cpBigNumListGet(&pList);
- ECP_POINT_Y(&Tmp) = cpBigNumListGet(&pList);
- ECP_POINT_Z(&Tmp) = cpBigNumListGet(&pList);
- /* Tmp = (own)_private * (alien)_public */
- ECP_METHOD(pECC)->MulPoint(pPublicB, pPrivateA, &Tmp, pECC, pList);
- /* test: Tmp ~ point at Infinity */
- if( ECCP_IsPointAtInfinity(&Tmp) )
- return ippStsShareKeyErr;
- else {
- ECP_METHOD(pECC)->GetPointAffine(pShare, NULL, &Tmp, pECC, pList);
- return ippStsNoErr;
- }
- }
- }
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