Functions for Creation of Cryptographic Contexts

Developer Guide and Reference for Intel® Cryptography Primitives Library

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ID 834196

Date 3/31/2025

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Functions for Creation of Cryptographic Contexts

The section presents source code for creation of some cryptographic contexts.

Declarations

Contents of the header file (xsample_cpobjs.h) declaring functions for creation of some cryptographic contexts are presented below:


#if !defined _CPOBJS_H_
#define _CPOBJS_H_


//
// create new of some ippCP 'objects'
//
#include "ippcp.h"
#include <stdlib.h>


#define BITS_2_WORDS(n) (((n)+31)>>5)
int Bitsize2Wordsize(int nBits);


Ipp32u* rand32(Ipp32u* pX, int size);


IppsBigNumState* newBN(int len, const Ipp32u* pData=0);
IppsBigNumState* newRandBN(int len);
void deleteBN(IppsBigNumState* pBN);


IppsPrimeState* newPrimeGen(int seedBitsize=160);
void deletePrimeGen(IppsPrimeState* pPrime);


IppsRSAState* newRSA(int lenN, int lenP, IppRSAKeyType type);
void deleteRSA(IppsRSAState* pRSA);


IppsDLPState* newDLP(int lenM, int lenL);
void deleteDLP(IppsDLPState* pDLP);


#endif // _CPOBJS_H_

Definitions

C++ definitions of functions creating cryptographic contexts are given below. For the declarations to be included, see the preceding section.


#include "xsample_cpobjs.h"


// convert bitsize into 32-bit wordsize
int Bitsize2Wordsize(int nBits)
{ return (nBits+31)>>5; }


// new BN number
IppsBigNumState* newBN(int len, const Ipp32u* pData)
{
   int size;
   ippsBigNumGetSize(len, &size);
   IppsBigNumState* pBN = (IppsBigNumState*)( new Ipp8u [size] );
   ippsBigNumInit(len, pBN);
   if(pData)
      ippsSet_BN(IppsBigNumPOS, len, pData, pBN);
   return pBN;
}
void deleteBN(IppsBigNumState* pBN)
{ delete [] (Ipp8u*)pBN; }


// set up array of 32-bit items random
Ipp32u* rand32(Ipp32u* pX, int size)
{
   for(int n=0; n<size; n++)
      pX[n] = (rand()<<16) + rand();
   return pX;
}


IppsBigNumState* newRandBN(int len)
{
   Ipp32u* pBuffer = new Ipp32u [len];
   IppsBigNumState* pBN = newBN(len, rand32(pBuffer,len));
   delete [] pBuffer;
   return pBN;
}


//
// 'external' PRNG
//
IppsPRNGState* newPRNG(int seedBitsize)
{
   int seedSize = Bitsize2Wordsize(seedBitsize);
   Ipp32u* seed = new Ipp32u [seedSize];
   Ipp32u* augm = new Ipp32u [seedSize];


   int size;
   IppsBigNumState* pTmp;
   ippsPRNGGetSize(&size);
   IppsPRNGState* pCtx = (IppsPRNGState*)( new Ipp8u [size] );
   ippsPRNGInit(seedBitsize, pCtx);


   ippsPRNGSetSeed(pTmp=newBN(seedSize,rand32(seed,seedSize)), pCtx);
   delete [] (Ipp8u*)pTmp;
   ippsPRNGSetAugment(pTmp=newBN(seedSize,rand32(augm,seedSize)),pCtx);
   delete [] (Ipp8u*)pTmp;


   delete [] seed;
   delete [] augm;
   return pCtx;
}
void deletePRNG(IppsPRNGState* pPRNG)
{ delete [] (Ipp8u*)pPRNG; }


//
// Prime Generator context
//
IppsPrimeState* newPrimeGen(int maxBits)
{
   int size;
   ippsPrimeGetSize(maxBits, &size);
   IppsPrimeState* pCtx = (IppsPrimeState*)( new Ipp8u [size] );
   ippsPrimeInit(maxBits, pCtx);
   return pCtx;
}
void deletePrimeGen(IppsPrimeState* pPrimeG)
{ delete [] (Ipp8u*)pPrimeG; }


//
// RSA context
//
IppsRSAState* newRSA(int lenN, int lenP, IppRSAKeyType type)
{
   int size;
   ippsRSAGetSize(lenN,lenP, type, &size);
   IppsRSAState* pCtx = (IppsRSAState*)( new Ipp8u [size] );
   ippsRSAInit(lenN,lenP, type, pCtx);
   return pCtx;
}
void deleteRSA(IppsRSAState* pRSA)
{ delete [] (Ipp8u*)pRSA; }


//
// DLP context
//
IppsDLPState* newDLP(int lenM, int lenL)
{
   int size;
   ippsDLPGetSize(lenM, lenL, &size);
   IppsDLPState *pCtx= (IppsDLPState *)new Ipp8u[ size ];
   ippsDLPInit(lenM, lenL, pCtx);
   return pCtx;
}
void deleteDLP(IppsDLPState* pDLP)
{ delete [] (Ipp8u*)pDLP; }

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