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/*******************************************************************************
* Copyright 2004-2018 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.
// PRNG Functions
//
// Contents:
// cpPRNGenRange()
//
*/
#include "owndefs.h"
#include "owncp.h"
#include "pcpbn.h"
#include "pcphash.h"
#include "pcpprng.h"
#include "pcptool.h"
/* generates random string of specified bitSize length
within specified ragnge lo < r < Hi
returns:
0 random bit string not generated
1 random bit string generated
-1 detected internal error (ippStsNoErr != rndFunc())
*/
int cpPRNGenRange(BNU_CHUNK_T* pRand,
const BNU_CHUNK_T* pLo, cpSize loLen,
const BNU_CHUNK_T* pHi, cpSize hiLen,
IppBitSupplier rndFunc, void* pRndParam)
{
int bitSize = BITSIZE_BNU(pHi,hiLen);
BNU_CHUNK_T topMask = MASK_BNU_CHUNK(bitSize);
#define MAX_COUNT (1000)
int n;
for(n=0; n<MAX_COUNT; n++) {
cpSize randLen;
IppStatus sts = rndFunc((Ipp32u*)pRand, bitSize, pRndParam);
if(ippStsNoErr!=sts) return -1;
pRand[hiLen-1] &= topMask;
randLen = cpFix_BNU(pRand, hiLen);
if((0 < cpCmp_BNU(pRand, randLen, pLo, loLen)) && (0 < cpCmp_BNU(pHi, hiLen, pRand, randLen)))
return 1;
}
#undef MAX_COUNT
return 0; /* no random matched to (Lo,Hi) */
}
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