Java

Convert Java KeyStore to PKCS12 / PFX

See more Java KeyStore (JKS) Examples

Loads a Java keystore file and saves it as a PKCS12 / PFX. A Java keystore (JKS) can contain two types of entries: (1) trusted root certificates or (2) private keys + cert chains. Usually a JKS will contain all entries of one type or another (and thus a particular JKS serves one purpose or another; meaning that a JKS containing trusted roots is used as a source for verifying pre-trusted roots, and a JKS containing private keys (and cert chains) is used as a secure, encrypted store for private keys).

A PKCS12 / PFX typically contains one or more private keys, along with each private key's certificate chain. Therefore, it typically makes sense to only write the private key entries to a PKCS12 (and the associated certificate chains). If a JKS contains trusted root certificates, it makes more sense to conver it to a PEM file (such as the CA cert bundle in PEM format from mozilla.org).

Chilkat2 Java

import com.chilkatsoft.chilkat2.CertChain;
import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.JavaKeyStore;
import com.chilkatsoft.chilkat2.Pfx;
import com.chilkatsoft.chilkat2.PrivateKey;

public class ChilkatExample {

    public static void main(String[] args) {
        // This requires the Chilkat API to have been previously unlocked.
        // See Global Unlock Sample for sample code.

        JavaKeyStore jks = new JavaKeyStore();

        String jksPassword = "myJksPassword";

        // Load the Java keystore from a file.  The JKS file password is used
        // to verify the keyed digest that is found at the very end of the keystore.
        // It verifies that the keystore has not been modified.
        try {
            jks.loadFile(jksPassword, "/someDir/keyStore.jks");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // To convert, we'll access the private key entries
        // from the JKS, add each to the PKCS12, and then save the PKCS12.
        Pfx pkcs12 = new Pfx();

        int numPrivateKeys = jks.getNumPrivateKeys();

        PrivateKey privKey = null;
        CertChain certChain = null;

        // For each private key entry, get the private key and
        // the associated certificate chain.
        // Each private key is password protected.  Usually it is the same
        // password as used for the keyed digest of the entire JKS.
        // However, this does not have to be.  The password is passed
        // here to handle the possibility of each private key requiring
        // a different password.
        int i = 0;
        while (i < numPrivateKeys) {
            privKey = ERROR: Method not in Chilkat2 Java: JavaKeyStore.GetPrivateKey
jks.ERROR();
            System.out.println(jks.getPrivateKeyAlias(i));
            certChain = ERROR: Method not in Chilkat2 Java: JavaKeyStore.GetCertChain
jks.ERROR();

            // Add the private key and it's associated certificate chain to the PKCS12.
            try {
                pkcs12.addPrivateKey(privKey, certChain);
            } catch (ChilkatException e) {
                System.out.println(e.getLastErrorText());
                certChain.close();
                privKey.close();
                return;
            }

            certChain.close();
            privKey.close();
            i = i + 1;
        }

        // Save the PKCS12 / PFX to a file.
        // The password can be the same as the JKS password, or something new.
        // (With the PKCS12 format, there is a single password for the entire contents
        // of the file.  With the JKS format, there is flexibility in allowing each private key
        // to have it's own password.)
        String pkcs12Password = "myNewPassword";
        try {
            pkcs12.toFile(pkcs12Password, "/pkcs12_files/myPfx.p12");
            System.out.println("Successfully saved to PKCS12 format.");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
        }
    }
}