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/* -*-mode:java; c-basic-offset:2; indent-tabs-mode:nil -*- */
/**
* This program will demonstrate to change the passphrase for a
* private key file instead of creating a new private key.
* $ CLASSPATH=.:../build javac ChangePassphrase.java
* $ CLASSPATH=.:../build java ChangePassphrase 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.*;
import javax.swing.*;
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=(JTextField)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=(JTextField)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.setPassphrase(passphrase);
kpair.writePrivateKey(pkey);
kpair.dispose();
}
catch(Exception e){
System.out.println(e);
}
System.exit(0);
}
}
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