(Java) Change Password for Java KeyStore File

Demonstrates how to load a Java keystore, change the password, and save using the new password. If the Java keystore contains only trusted root certificates, then it's simply a matter of loading the JKS with the existing password, and then saving with a new password. If the JKS contains private key entries, then each private key entry must be re-keyed using the new password by calling the ChangePassword method.

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

    CkJavaKeyStore jks = new CkJavaKeyStore();

    String oldJksPassword = "existingPassword";
    String newJksPassword = "newPassword";
    String jksPath = "/someDir/keyStore.jks";

    // Load the Java keystore from a file.
    boolean success = jks.LoadFile(oldJksPassword,jksPath);
    if (success != true) {
        System.out.println(jks.lastErrorText());
        return;
        }

    // If the JKS contains private key entries, then each
    // must be re-keyed with the new password by calling ChangePassword.
    int numPrivateKeys = jks.get_NumPrivateKeys();

    int i = 0;
    while (i < numPrivateKeys) {

        success = jks.ChangePassword(i,oldJksPassword,newJksPassword);
        if (success != true) {
            System.out.println(jks.lastErrorText());
            return;
            }

        i = i+1;
        }

    // Write the JKS using the new password for the JKS file's keyed digest.
    success = jks.ToFile(newJksPassword,jksPath);
    if (success != true) {
        System.out.println(jks.lastErrorText());
        return;
        }

    System.out.println("Updated the password for the Java keystore file.");
  }
}