*/
protected CertPathParameters getParameters(String algorithm,
String crlf,
KeyStore trustStore)
throws Exception {
CertPathParameters params = null;
if("PKIX".equalsIgnoreCase(algorithm)) {
PKIXBuilderParameters xparams =
new PKIXBuilderParameters(trustStore, new X509CertSelector());
Collection<? extends CRL> crls = getCRLs(crlf);
CertStoreParameters csp = new CollectionCertStoreParameters(crls);