Export Private Key to PKCS8, PEM, DER, XML

Demonstrates how to export a digital certificate's private key to RSA PEM or DER, PKCS8 PEM or DER, or XML.

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 PrivateKey object:
        CkPrivateKey pkey;

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

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

            //  Export to a PKCS8 DER file:
            pkey.SavePkcs8File("pkey_pkcs8.der");

            //  Export to an RSA PEM file:
            pkey.SaveRsaPemFile("pkey_rsa.pem");

            //  Export to a PKCS8 PEM file:
            pkey.SavePkcs8PemFile("pkey_pkcs8.pem");

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

            //  Get PKCS8 PEM string:
            System.out.println("PKCS8 PEM Private Key:");
            System.out.println(pkey.getPkcs8Pem());

            //  Get RSA PEM string:
            System.out.println("RSA PEM Private Key:");
            System.out.println(pkey.getRsaPem());

        }
        else {
            System.out.println("No private 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.

  }
}