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Use X 509 certificate

import java.io.BufferedWriter; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.OutputStreamWriter; import java.security.cert.Certificate; import java.security.cert.CertificateFactory; public class MainClass {   public static void main(String args[]) throws Exception {     CertificateFactory cf = CertificateFactory.getInstance("X.509");     FileInputStream in = new FileInputStream(args[0]);     Certificate c = cf.generateCertificate(in);     in.close();     String s = c.toString();     FileOutputStream fout = new FileOutputStream("tmp.txt");     BufferedWriter out = new BufferedWriter(new OutputStreamWriter(fout));     out.write(s, 0, s.length());     out.close();   } }