C:/work/OMMR/OCHHP_OMMR_OMMR/Code/Assemblies/SharpSSH/Source/SharpSSH-1.1.1.13.src/Examples/jsch_samples/ChangePassphrase.cs

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using System;
using System.IO;
using System.Windows.Forms;
using Tamir.SharpSsh.jsch;

/* ChangePassphrase.cs
 * ====================================================================
 * The following example was posted with the original JSch java library,
 * and is translated to C# to show the usage of SharpSSH JSch API
 * ====================================================================
 * */
namespace sharpSshTest.jsch_samples
{
        public class ChangePassphrase
        {
                public static void RunExample(String[] arg)
                {
                        //Get the private key filename from the user
                        Console.WriteLine("Please choose your private key file...");
                        String pkey = InputForm.GetFileFromUser("Choose your privatekey(ex. ~/.ssh/id_dsa)");
                        Console.WriteLine("You chose "+pkey+".");

                        //Create a new JSch instance
                        JSch jsch=new JSch();

                        try
                        {
                                //Load the key pair
                                KeyPair kpair=KeyPair.load(jsch, pkey);

                                //Print the key file encryption status
                                Console.WriteLine(pkey+" has "+(kpair.isEncrypted()?"been ":"not been ")+"encrypted");

                                String passphrase = "";

                                while(kpair.isEncrypted())
                                {
                                        passphrase = InputForm.GetUserInput("Enter passphrase for "+pkey, true);
                                        if(!kpair.decrypt(passphrase))
                                        {
                                                Console.WriteLine("failed to decrypt "+pkey);
                                        }
                                        else
                                        {
                                                Console.WriteLine(pkey+" is decrypted.");
                                        }
                                }

                                passphrase="";

                                passphrase=InputForm.GetUserInput("Enter new passphrase for "+pkey+
                                               " (empty for no passphrase)", true);

                                //Set the new passphrase
                                kpair.setPassphrase(passphrase);
                                //write the key to file
                                kpair.writePrivateKey(pkey);
                                //free the resource
                                kpair.dispose();
                        }
                        catch(Exception e)
                        {
                                Console.WriteLine(e.Message);
                        }
                }
        }
}

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