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1
2 import com.jcraft.jsch.*;
3 import javax.swing.*;
4
5 class ChangePassphrase{
6 public static void main(String  [] arg){
7 if(arg.length!=1){
8 System.err.println("usage: java ChangePassphrase private_key");
9 System.exit(-1);
10 }
11
12 JSch jsch=new JSch();
13
14 String pkey=arg[0];
15
16 try{
17 KeyPair kpair=KeyPair.load(jsch, pkey);
18
19 System.out.println(pkey+" has "+(kpair.isEncrypted()?"been ":"not been ")+"encrypted");
20
21 String passphrase="";
22 while(kpair.isEncrypted()){
23 JTextField passphraseField=(JTextField)new JPasswordField(20);
24 Object [] ob={passphraseField};
25 int result=JOptionPane.showConfirmDialog(null, ob,
26 "Enter passphrase for "+pkey,
27 JOptionPane.OK_CANCEL_OPTION);
28 if(result!=JOptionPane.OK_OPTION){
29 System.exit(-1);
30 }
31 passphrase=passphraseField.getText();
32 if(!kpair.decrypt(passphrase)){
33 System.out.println("failed to decrypt "+pkey);
34 }
35 else{
36 System.out.println(pkey+" is decrypted.");
37 }
38 }
39
40 passphrase="";
41
42 JTextField passphraseField=(JTextField)new JPasswordField(20);
43 Object [] ob={passphraseField};
44 int result=JOptionPane.showConfirmDialog(null, ob,
45 "Enter new passphrase for "+pkey+
46 " (empty for no passphrase)",
47 JOptionPane.OK_CANCEL_OPTION);
48 if(result!=JOptionPane.OK_OPTION){
49 System.exit(-1);
50 }
51 passphrase=passphraseField.getText();
52
53 kpair.setPassphrase(passphrase);
54 kpair.writePrivateKey(pkey);
55 kpair.dispose();
56 }
57 catch(Exception e){
58 System.out.println(e);
59 }
60 System.exit(0);
61 }
62 }
63 |
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