Export Public Key to RSA DER, OpenSSL DER/PEM, XML

Demonstrates how to export a digital certificate's public key to RSA DER, OpenSSL PEM or DER, or to XML format.

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();

    //  Th LoadByCommonName method searches the Windows
    //  Current User Certificate Store and Local Machine Certificate
    //  Store for a certificate whose common name (CN) matches
    //  the argument:
    boolean success;
    success = cert.LoadByCommonName("Chilkat Software, Inc.");
    if (success == false) {
        System.out.println("Failed to find certificate!");
    }
    else {

        //  Get the PublicKey object:
        CkPublicKey pkey;

        pkey = cert.ExportPublicKey();
        if (!(pkey == null )) {

            //  Export the public key to an RSA DER file:
            pkey.SaveRsaDerFile("pubkey_rsa.der");

            //  Export to an OpenSSL DER file:
            pkey.SaveOpenSslDerFile("pubkey_openssl.der");

            //  Export to an OpenSSL PEM file:
            pkey.SaveOpenSslPemFile("pubkey_openssl.pem");

            //  Export to an XML file:
            pkey.SaveXmlFile("pubkey.xml");

            //  Get OpenSSL PEM string:
            System.out.println("OpenSSL PEM Public Key:");
            System.out.println(pkey.getOpenSslPem());

        }
        else {
            System.out.println("No public key found!");
        }

    }

    //  The Chilkat Certificate, Certificate Store, Private Key,
    //  Public Key, and Key Container classes / objects are freeware.

    //  They are used by and included with the Chilkat Email,
    //  Crypt, S/MIME, and other commercial Chilkat components.

  }
}