ext/ipp/sources/ippcp/pcpprime_isco.h

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/*
//
//  Purpose:
//     Cryptography Primitive.
//     RSA Functions
//
//
*/

#include "owndefs.h"
#include "owncp.h"
#include "pcpbn.h"
#include "pcpprimeg.h"
#include "pcpprng.h"
#include "pcpngrsa.h"

/* test if E and A are coprime */
static int cpIsCoPrime(BNU_CHUNK_T* pA, int nsA,
    BNU_CHUNK_T* pB, int nsB,
    BNU_CHUNK_T* pBuffer)
{
    if (nsA>nsB) {
        SWAP_PTR(BNU_CHUNK_T, pA, pB);
        SWAP(nsA, nsB);
    }
    {
        IppsBigNumState bnA, bnB, bnGcd;
        BNU_CHUNK_T* pDataA = pBuffer;
        BNU_CHUNK_T* pBuffA = pDataA + nsA + 1;
        BNU_CHUNK_T* pDataB = pBuffA + nsA + 1;
        BNU_CHUNK_T* pBuffB = pDataB + nsB + 1;
        BNU_CHUNK_T* pDataGcd = pBuffB + nsB + 1;
        BNU_CHUNK_T* pBuffGcd = pDataGcd + nsB + 1;

        BN_Make(pDataA, pBuffA, nsA, &bnA);
        BN_Make(pDataB, pBuffB, nsB, &bnB);
        BN_Make(pDataGcd, pBuffGcd, nsB, &bnGcd);

        COPY_BNU(pDataA, pA, nsA)
            BN_Set(pDataA, nsA, &bnA);
        COPY_BNU(pDataB, pB, nsB)
            BN_Set(pDataB, nsB, &bnB);
        ippsGcd_BN(&bnA, &bnB, &bnGcd);
        return 0 == cpBN_cmp(&bnGcd, cpBN_OneRef());
    }
}