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/*******************************************************************************
* Copyright 2017-2018 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. Modular Arithmetic Engine. General Functionality
//
// Contents:
// gsModEngineGetSize()
//
*/
#include "owndefs.h"
#include "owncp.h"
#include "pcpbnumisc.h"
#include "pcpbnuarith.h"
#include "gsmodstuff.h"
#include "pcptool.h"
/*F*
// Name: gsModEngineGetSize
//
// Purpose: Specifies size of size of ModEngine context (Montgomery).
//
// Returns: Reason:
// ippStsLengthErr modulusBitSize < 1
// numpe < MOD_ENGINE_MIN_POOL_SIZE
// ippStsNoErr no errors
//
// Parameters:
// numpe length of pool
// modulusBitSize max modulus length (in bits)
// pSize pointer to size
//
*F*/
IppStatus gsModEngineGetSize(int modulusBitSize, int numpe, int* pSize)
{
int modLen = BITS_BNU_CHUNK(modulusBitSize);
int pelmLen = BITS_BNU_CHUNK(modulusBitSize);
IPP_BADARG_RET(modulusBitSize<1, ippStsLengthErr);
IPP_BADARG_RET(numpe<MOD_ENGINE_MIN_POOL_SIZE, ippStsLengthErr);
/* allocates mimimal necessary to Montgomery based methods */
*pSize = sizeof(gsModEngine)
+ modLen*sizeof(BNU_CHUNK_T) /* modulus */
+ modLen*sizeof(BNU_CHUNK_T) /* mont_R */
+ modLen*sizeof(BNU_CHUNK_T) /* mont_R^2 */
+ pelmLen*sizeof(BNU_CHUNK_T)*numpe; /* buffers */
return ippStsNoErr;
}
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