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40
41 /*
42 //
43 // Purpose:
44 // Cryptography Primitive.
45 // PRNG Functions
46 //
47 // Contents:
48 // cpPRNGenPattern()
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 returns:
61 1 random bit string generated
62 -1 detected internal error (ippStsNoErr != rndFunc())
63 */
cpPRNGenPattern(BNU_CHUNK_T * pRand,int bitSize,BNU_CHUNK_T botPattern,BNU_CHUNK_T topPattern,IppBitSupplier rndFunc,void * pRndParam)64 int cpPRNGenPattern(BNU_CHUNK_T* pRand, int bitSize,
65 BNU_CHUNK_T botPattern, BNU_CHUNK_T topPattern,
66 IppBitSupplier rndFunc, void* pRndParam)
67 {
68 BNU_CHUNK_T topMask = MASK_BNU_CHUNK(bitSize);
69 cpSize randLen = BITS_BNU_CHUNK(bitSize);
70
71 IppStatus sts = rndFunc((Ipp32u*)pRand, bitSize, pRndParam);
72 if(ippStsNoErr!=sts) return -1;
73
74 pRand[randLen-1] &= topMask;
75 pRand[0] |= botPattern;
76 pRand[randLen-1] |= topPattern;
77 return 1;
78 }
79