Dart

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).

Dart

import 'package:chilkat/chilkat.dart';

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

  final jks = CkJavaKeyStore();

  final 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');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

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

  final numPrivateKeys = jks.numPrivateKeys;
  var i = 0;

  // 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.
  i = 0;
  while (i < numPrivateKeys) {
    final privKey = jks.getPrivateKey(jksPassword, i);
    print(jks.getPrivateKeyAlias(i));
    final certChain = jks.getCertChain(i);

    // Add the private key and it's associated certificate chain to the PKCS12.
    try {
      pkcs12.addPrivateKey(privKey, certChain);
    } on ChilkatException catch (e) {
      print(e.lastErrorText);

      return;
    }

    i++;
  }

  // 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.)
  final pkcs12Password = 'myNewPassword';
  try {
    pkcs12.toFile(pkcs12Password, '/pkcs12_files/myPfx.p12');
    print('Successfully saved to PKCS12 format.');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
  }
}