1 /*******************************************************************************
2 * Copyright 2004-2018 Intel Corporation
3 * All Rights Reserved.
4 *
5 * If this software was obtained under the Intel Simplified Software License,
6 * the following terms apply:
7 *
8 * The source code, information and material ("Material") contained herein is
9 * owned by Intel Corporation or its suppliers or licensors, and title to such
10 * Material remains with Intel Corporation or its suppliers or licensors. The
11 * Material contains proprietary information of Intel or its suppliers and
12 * licensors. The Material is protected by worldwide copyright laws and treaty
13 * provisions. No part of the Material may be used, copied, reproduced,
14 * modified, published, uploaded, posted, transmitted, distributed or disclosed
15 * in any way without Intel's prior express written permission. No license under
16 * any patent, copyright or other intellectual property rights in the Material
17 * is granted to or conferred upon you, either expressly, by implication,
18 * inducement, estoppel or otherwise. Any license under such intellectual
19 * property rights must be express and approved by Intel in writing.
20 *
21 * Unless otherwise agreed by Intel in writing, you may not remove or alter this
22 * notice or any other notice embedded in Materials by Intel or Intel's
23 * suppliers or licensors in any way.
24 *
25 *
26 * If this software was obtained under the Apache License, Version 2.0 (the
27 * "License"), the following terms apply:
28 *
29 * You may not use this file except in compliance with the License. You may
30 * obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
31 *
32 *
33 * Unless required by applicable law or agreed to in writing, software
34 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
35 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
36 *
37 * See the License for the specific language governing permissions and
38 * limitations under the License.
39 *******************************************************************************/
40
41 /*
42 //
43 // Purpose:
44 // Cryptography Primitive.
45 // PRNG Functions
46 //
47 // Contents:
48 // cpPRNGenRange()
49 //
50 */
51
52 #include "owndefs.h"
53 #include "owncp.h"
54 #include "pcpbn.h"
55 #include "pcphash.h"
56 #include "pcpprng.h"
57 #include "pcptool.h"
58
59 /* generates random string of specified bitSize length
60 within specified ragnge lo < r < Hi
61 returns:
62 0 random bit string not generated
63 1 random bit string generated
64 -1 detected internal error (ippStsNoErr != rndFunc())
65 */
cpPRNGenRange(BNU_CHUNK_T * pRand,const BNU_CHUNK_T * pLo,cpSize loLen,const BNU_CHUNK_T * pHi,cpSize hiLen,IppBitSupplier rndFunc,void * pRndParam)66 int cpPRNGenRange(BNU_CHUNK_T* pRand,
67 const BNU_CHUNK_T* pLo, cpSize loLen,
68 const BNU_CHUNK_T* pHi, cpSize hiLen,
69 IppBitSupplier rndFunc, void* pRndParam)
70 {
71 int bitSize = BITSIZE_BNU(pHi,hiLen);
72 BNU_CHUNK_T topMask = MASK_BNU_CHUNK(bitSize);
73
74 #define MAX_COUNT (1000)
75 int n;
76 for(n=0; n<MAX_COUNT; n++) {
77 cpSize randLen;
78 IppStatus sts = rndFunc((Ipp32u*)pRand, bitSize, pRndParam);
79 if(ippStsNoErr!=sts) return -1;
80
81 pRand[hiLen-1] &= topMask;
82 randLen = cpFix_BNU(pRand, hiLen);
83 if((0 < cpCmp_BNU(pRand, randLen, pLo, loLen)) && (0 < cpCmp_BNU(pHi, hiLen, pRand, randLen)))
84 return 1;
85 }
86 #undef MAX_COUNT
87
88 return 0; /* no random matched to (Lo,Hi) */
89 }
90