var certStore = listAvailableCertificatesFromFileSystem();
  var certPaths = certStore.listAvailableCertificatesFromFileSystem("/sdcard/", "p12");
  var cert = certStore.getSignedCertificateFromFile(certPaths[0], servicePassword);
  var headersMap = [];
  headersMap["SSL_CLIENT_CERT"] = cert.signedCertificate; // here I dont know how could I access it.


 this.oModel = new sap.ui.model.odata.v2.ODataModel(this.serviceUrl, {
            user: serviceLogin,
            password: servicePassword,
            withCredentials: true,
            disableHeadRequestForToken: false,
            useBatch: false,
            headers: headersMap  // here i specify the header...
        });