FILE *pkef;
                pkef=fopen("pke.txt", "a");
                for(j=0; j<nparallel; ++j)
                {
                        /* compute the pairwise transient key and the frame MIC */

                        for (i = 0; i < 4; i++)
                        {
                                pke[99] = i;
                                HMAC(EVP_sha1(), pmk[j], 32, pke, 100, ptk[j] + i * 20, NULL);
                                int kk = 0;
                                fprintf(pkef,"==> ");
                                for(kk = 0;kk<=99;kk++){
                                        fprintf(pkef, "%i ",pke[kk]);
                                }
                                fprintf(pkef,"\n---------------------\n");
                        }