Convert Certificate from PEM to DER

Convert a PEM formatted certificate file (.cer, .crt, .pem) to DER format (.cer, .der). The Chilkat certificate class/object is a freeware component that is included in many of the Chilkat downloads.

Download Chilkat Java Library

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    CkCert cert = new CkCert();

    boolean success;

    //  LoadFromFile will load either PEM and DER formatted files.
    //  It automatically recognizes the file format based on the
    //  file contents.
    success = cert.LoadFromFile("chilkat.crt");
    if (success != true) {
        System.out.println(cert.lastErrorText());
        return;
    }

    System.out.println(cert.subjectDN());

    success = cert.ExportCertDerFile("chilkat.der");
    if (success != true) {
        System.out.println(cert.lastErrorText());
        return;
    }

    System.out.println("success!");

  }
}