int nDHRet = DH_generate_parameters_ex(pDH, 1024, DH_GENERATOR_2, &g_cb); // 1024 bit에 g는 2로 생성.
if(!DH_check(pDH, &nDHRet))
{
return;
}
if(nDHRet & DH_CHECK_P_NOT_PRIME)
printf("p value is not prime\n");
if(nDHRet & DH_CHECK_P_NOT_SAFE_PRIME)
printf("p value is not a safe prime\n");
if(nDHRet & DH_UNABLE_TO_CHECK_GENERATOR)
printf("unable to check the generator value\n");
if(nDHRet & DH_NOT_SUITABLE_GENERATOR)
printf("the g value is not a generator\n");
if(nDHRet == 0)
printf("DH parameters appear to be ok.\n");
int nPBits = BN_num_bits(pDH->p); // p의 bit 크기 : 1024
int nGBits = BN_num_bits(pDH->g); // g의 bit 크기 : 2 (g가 5일땐 3)