Export a Certificate's Private Key to Various Formats

Loads a digital certificate and private key from a PFX file (also known as PKCS#12) and exports the private key to various formats: (1) PKCS8 Encrypted, (2) PKCS8 Encrypted PEM, (3) PKCS8 unencrypted, (4) PKCS8 PEM unencrypted, (5) RSA DER unencrypted, (6) RSA PEM unencrypted, (7) XML.

 Chilkat Java Library Downloads for Windows, Linux, and MAC OS X

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;

    //  Load from the PFX file
    String pfxFilename;
    pfxFilename = "/Users/chilkat/testData/pfx/chilkat_ssl_pwd_is_test.pfx";
    String pfxPassword;
    pfxPassword = "test";

    //  A PFX typically contains certificates in the chain of authentication.
    //  The Chilkat cert object will choose the certificate w/
    //  private key farthest from the root authority cert.
    //  To access all the certificates in a PFX, use the
    //  Chilkat certificate store object instead.
    success = cert.LoadPfxFile(pfxFilename,pfxPassword);
    if (success != true) {
        System.out.println(cert.lastErrorText());
        return;
    }

    //  Get the private key...
    CkPrivateKey privKey;
    privKey = cert.ExportPrivateKey();
    if (privKey == null ) {
        System.out.println(cert.lastErrorText());
        return;
    }

    //  Export to various formats:

    String password;
    password = "secret";
    String path;

    //  PKCS8 Encrypted DER
    path = "/Users/chilkat/testData/privkeys/chilkat_pkcs8_enc.der";
    success = privKey.SavePkcs8EncryptedFile(password,path);
    if (success != true) {
        System.out.println(privKey.lastErrorText());

        return;
    }

    //  PKCS8 Encrypted PEM
    path = "/Users/chilkat/testData/privkeys/chilkat_pkcs8_enc.pem";
    success = privKey.SavePkcs8EncryptedPemFile(password,path);
    if (success != true) {
        System.out.println(privKey.lastErrorText());

        return;
    }

    //  PKCS8 Unencrypted DER
    path = "/Users/chilkat/testData/privkeys/chilkat_pkcs8.der";
    success = privKey.SavePkcs8File(path);
    if (success != true) {
        System.out.println(privKey.lastErrorText());

        return;
    }

    //  PKCS8 Unencrypted PEM
    path = "/Users/chilkat/testData/privkeys/chilkat_pkcs8.pem";
    success = privKey.SavePkcs8PemFile(path);
    if (success != true) {
        System.out.println(privKey.lastErrorText());

        return;
    }

    //   RSA DER (unencrypted)
    path = "/Users/chilkat/testData/privkeys/chilkat_rsa.der";
    success = privKey.SaveRsaDerFile(path);
    if (success != true) {
        System.out.println(privKey.lastErrorText());

        return;
    }

    //  RSA PEM (unencrypted)
    path = "/Users/chilkat/testData/privkeys/chilkat_rsa.pem";
    success = privKey.SaveRsaPemFile(path);
    if (success != true) {
        System.out.println(privKey.lastErrorText());

        return;
    }

    //  XML (unencrypted)
    path = "/Users/chilkat/testData/privkeys/chilkat.xml";
    success = privKey.SaveXmlFile(path);
    if (success != true) {
        System.out.println(privKey.lastErrorText());

        return;
    }

    System.out.println("Private key exported to all formats.");


  }
}