import java.io.FileInputStream;
import java.security.PublicKey;
import java.security.cert.Certificate;
import java.security.cert.CertificateFactory;
public class MainClass {
public static void main(String args[]) throws Exception {
Certificate[] certpath = new Certificate[args.length - 1];
CertificateFactory cf = CertificateFactory.getInstance("X.509");
int i;
for (i = 0; i < args.length - 1; i++) {
FileInputStream in = new FileInputStream(args[i]);
certpath[i] = cf.generateCertificate(in);
}
FileInputStream in = new FileInputStream(args[i]);
Certificate trust = cf.generateCertificate(in);
boolean pass = false;
String reason = "";
for (i = 0; i < certpath.length; i++) {
try {
PublicKey pbk;
if (i == certpath.length - 1) {
pbk = trust.getPublicKey();
} else {
pbk = certpath[i + 1].getPublicKey();
}
certpath[i].verify(pbk);
pass = true;
} catch (Exception e) {
pass = false;
reason += i + " " + e.toString();
break;
}
}
System.out.println(pass);
}
}