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/*******************************************************************************
* Copyright 2002-2018 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.
*******************************************************************************/
/*
// Intel(R) Integrated Performance Primitives
// Cryptographic Primitives (ippcp)
//
// Contents:
// ippsMontExp()
//
*/
#include "owndefs.h"
#include "owncp.h"
#include "pcpbn.h"
#include "pcpmontgomery.h"
#include "pcptool.h"
/*F*
// Name: ippsMontExp
//
// Purpose: computes the Montgomery exponentiation with exponent
// IppsBigNumState *pE to the given big number integer of Montgomery form
// IppsBigNumState *pA with respect to the modulus IppsMontState *pCtx.
//
// Returns: Reason:
// ippStsNoErr Returns no error.
// ippStsNullPtrErr Returns an error when pointers are null.
// ippStsBadArgErr Returns an error when a or b is a negative integer.
// ippStsScaleRangeErr Returns an error when a or b is more than m.
// ippStsOutOfRangeErr Returns an error when IppsBigNumState *r is larger than
// IppsMontState *m.
// ippStsContextMatchErr Returns an error when the context parameter does
// not match the operation.
//
//
// Parameters:
// pA big number integer of Montgomery form within the
// range [0,m-1]
// pE big number exponent
// pCtx Montgomery modulus of IppsMontState
/ pR the Montgomery exponentation result.
//
// Notes: IppsBigNumState *r should possess enough memory space as to hold the result
// of the operation. i.e. both pointers r->d and r->buffer should possess
// no less than (m->n->length) number of 32-bit words.
*F*/
IPPFUN(IppStatus, ippsMontExp, (const IppsBigNumState* pA, const IppsBigNumState* pE, IppsMontState* pCtx, IppsBigNumState* pR))
{
IPP_BAD_PTR4_RET(pA, pE, pCtx, pR);
pCtx = (IppsMontState*)(IPP_ALIGNED_PTR((pCtx), MONT_ALIGNMENT));
pA = (IppsBigNumState*)( IPP_ALIGNED_PTR(pA, BN_ALIGNMENT) );
pE = (IppsBigNumState*)( IPP_ALIGNED_PTR(pE, BN_ALIGNMENT) );
pR = (IppsBigNumState*)( IPP_ALIGNED_PTR(pR, BN_ALIGNMENT) );
IPP_BADARG_RET(!MNT_VALID_ID(pCtx), ippStsContextMatchErr);
IPP_BADARG_RET(!BN_VALID_ID(pA), ippStsContextMatchErr);
IPP_BADARG_RET(!BN_VALID_ID(pE), ippStsContextMatchErr);
IPP_BADARG_RET(!BN_VALID_ID(pR), ippStsContextMatchErr);
IPP_BADARG_RET(BN_ROOM(pR) < MOD_LEN( MNT_ENGINE(pCtx) ), ippStsOutOfRangeErr);
/* check a */
IPP_BADARG_RET(BN_NEGATIVE(pA), ippStsBadArgErr);
IPP_BADARG_RET(cpCmp_BNU(BN_NUMBER(pA), BN_SIZE(pA), MOD_MODULUS( MNT_ENGINE(pCtx) ), MOD_LEN( MNT_ENGINE(pCtx) )) >= 0, ippStsScaleRangeErr);
/* check e */
IPP_BADARG_RET(BN_NEGATIVE(pE), ippStsBadArgErr);
cpMontExpBin_BN(pR, pA, pE, MNT_ENGINE( pCtx) );
return ippStsNoErr;
}
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