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/**
* This progam will demonstrate the keypair generation. You will be asked a passphrase for
* output_keyfile. If everything works fine, you will get the keypair, output_keyfile and
* output_keyfile+".pub". The private key and public key are in the OpenSSH format.
*/
import com.jcraft.jsch.JSch;
import com.jcraft.jsch.KeyPair;
import javax.swing.JOptionPane;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
public class KeyGen {
public static void main(String[] arg) {
int key_size = 1024;
if (arg.length < 3) {
System.err.println("usage: java KeyGen rsa output_keyfile comment\n"
+ " java KeyGen dsa output_keyfile comment\n"
+ " java KeyGen ecdsa-sha2-256 output_keyfile comment\n"
+ " java KeyGen ecdsa-sha2-384 output_keyfile comment\n"
+ " java KeyGen ecdsa-sha2-521 output_keyfile comment");
System.exit(-1);
}
String _type = arg[0];
int type = 0;
if (_type.equals("rsa")) {
type = KeyPair.RSA;
} else if (_type.equals("dsa")) {
type = KeyPair.DSA;
} else if (_type.equals("ecdsa-sha2-nistp256")) {
type = KeyPair.ECDSA;
key_size = 256;
} else if (_type.equals("ecdsa-sha2-nistp384")) {
type = KeyPair.ECDSA;
key_size = 384;
} else if (_type.equals("ecdsa-sha2-nistp521")) {
type = KeyPair.ECDSA;
key_size = 521;
} else {
System.err.println("usage: java KeyGen rsa output_keyfile comment\n"
+ " java KeyGen dsa output_keyfile comment\n"
+ " java KeyGen ecdsa-sha2-256 output_keyfile comment\n"
+ " java KeyGen ecdsa-sha2-384 output_keyfile comment\n"
+ " java KeyGen ecdsa-sha2-521 output_keyfile comment");
System.exit(-1);
}
String filename = arg[1];
String comment = arg[2];
JSch jsch = new JSch();
String passphrase = "";
JTextField passphraseField = new JPasswordField(20);
Object[] ob = {passphraseField};
int result = JOptionPane.showConfirmDialog(null, ob,
"Enter passphrase (empty for no passphrase)", JOptionPane.OK_CANCEL_OPTION);
if (result == JOptionPane.OK_OPTION) {
passphrase = passphraseField.getText();
}
try {
KeyPair kpair = KeyPair.genKeyPair(jsch, type, key_size);
kpair.writePrivateKey(filename, passphrase.getBytes());
kpair.writePublicKey(filename + ".pub", comment);
System.out.println("Finger print: " + kpair.getFingerPrint());
kpair.dispose();
} catch (Exception e) {
System.out.println(e);
}
System.exit(0);
}
}
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