Example of Using Pseudorandom Number Generation Functions

Find Pseudorandom Co-primes

void FindCoPrimes(void){

   int size;

   // define Pseudo Random Generator (default settings)

   ippsPRNGGetSize(&size);

   IppsPRNGState* pPrng = (IppsPRNGState*)(new Ipp8u [size] );

   ippsPRNGInit(160, pPrng);

   // define 256-bits Big Numbers X and Y

   const int bnBitSize = 256;

   IppsBigNumState* bnX = New_BN(bnBitSize/32);

   IppsBigNumState* bnY = New_BN(bnBitSize/32);

   // define temporary Big Numbers GCD and 1

   IppsBigNumState* bnGCD = New_BN(bnBitSize/32);

   Ipp32u one = 1;

   IppsBigNumState* bnOne = New_BN(1, &one);

   // generate pseudo random X and Y

   // while GCD(X,Y) != 1

   Ipp32u result;

   int counter;

   for(counter=0,result=1; result; counter++) {

      ippsPRNGen_BN(bnX, bnBitSize, pPrng);

      ippsPRNGen_BN(bnY, bnBitSize, pPrng);

      ippsGcd_BN(bnX, bnY, bnGCD);

      ippsCmp_BN(bnGCD, bnOne, &result);

   }

   cout <<"Coprimes:" <<endl;

   Type_BN("X: ", bnX); cout <<endl;

   Type_BN("Y: ", bnY); cout <<endl;

   cout <<"were fond on " <<counter <<" attempt" <<endl;

   delete [] (Ipp8u*)pPrng;

   delete [] (Ipp8u*)bnX;

   delete [] (Ipp8u*)bnY;

   delete [] (Ipp8u*)bnGCD;

   delete [] (Ipp8u*)bnOne;

}