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/**
* This program will demonstrate to change the passphrase for a private key file instead of creating
* a new private key. A passphrase will be prompted if the given private-key has been encrypted.
* After successfully loading the content of the private-key, the new passphrase will be prompted
* and the given private-key will be re-encrypted with that new passphrase.
*/
import com.jcraft.jsch.JSch;
import com.jcraft.jsch.KeyPair;
import javax.swing.JOptionPane;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
public class ChangePassphrase {
public static void main(String[] arg) {
if (arg.length != 1) {
System.err.println("usage: java ChangePassphrase private_key");
System.exit(-1);
}
JSch jsch = new JSch();
String pkey = arg[0];
try {
KeyPair kpair = KeyPair.load(jsch, pkey);
System.out
.println(pkey + " has " + (kpair.isEncrypted() ? "been " : "not been ") + "encrypted");
String passphrase = "";
while (kpair.isEncrypted()) {
JTextField passphraseField = new JPasswordField(20);
Object[] ob = {passphraseField};
int result = JOptionPane.showConfirmDialog(null, ob, "Enter passphrase for " + pkey,
JOptionPane.OK_CANCEL_OPTION);
if (result != JOptionPane.OK_OPTION) {
System.exit(-1);
}
passphrase = passphraseField.getText();
if (!kpair.decrypt(passphrase)) {
System.out.println("failed to decrypt " + pkey);
} else {
System.out.println(pkey + " is decrypted.");
}
}
passphrase = "";
JTextField passphraseField = new JPasswordField(20);
Object[] ob = {passphraseField};
int result = JOptionPane.showConfirmDialog(null, ob,
"Enter new passphrase for " + pkey + " (empty for no passphrase)",
JOptionPane.OK_CANCEL_OPTION);
if (result != JOptionPane.OK_OPTION) {
System.exit(-1);
}
passphrase = passphraseField.getText();
kpair.writePrivateKey(pkey, passphrase.getBytes());
kpair.dispose();
} catch (Exception e) {
System.out.println(e);
}
System.exit(0);
}
}
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