KeyGen.cs :  » Network-Clients » SharpSSH » Tamir » SharpSsh » jsch » examples » C# / CSharp Open Source

using System;
using Tamir.SharpSsh.jsch;

/* KeyGen.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 Tamir.SharpSsh.jsch.examples{
  /// <summary>
  /// This progam will demonstrate the RSA/DSA keypair generation. 
  /// You will be asked a passphrase for output_keyfile.
  /// If everything works fine, you will get the DSA or RSA keypair, 
  /// output_keyfile and output_keyfile+".pub".
  /// The private key and public key are in the OpenSSH format.
  /// </summary>
  public class KeyGen
  {
    public static void Main(params string[] arg)
    {
      if(arg.Length<3)
      {
        Console.Error.WriteLine(
          "usage: java KeyGen rsa output_keyfile comment\n"+
          "       java KeyGen dsa  output_keyfile comment");
        Environment.Exit(-1);
      }

      //Get sig type ('rsa' or 'dsa')
      String _type=arg[0];
      int type=0;
      if(_type.Equals("rsa")){type=KeyPair.RSA;}
      else if(_type.Equals("dsa")){type=KeyPair.DSA;}
      else 
      {
        Console.Error.WriteLine(
          "usage: java KeyGen rsa output_keyfile comment\n"+
          "       java KeyGen dsa  output_keyfile comment");
        Environment.Exit(-1);
      }
      //Output file name
      String filename=arg[1];
      //Signature comment
      String comment=arg[2];

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

      //Prompt the user for a passphrase for the private key file
      String passphrase=InputForm.GetUserInput("Enter passphrase (empty for no passphrase)", true);

      try
      {
        //Generate the new key pair
        KeyPair kpair=KeyPair.genKeyPair(jsch, type);
        //Set a passphrase
        kpair.setPassphrase(passphrase);
        //Write the private key to "filename"
        kpair.writePrivateKey(filename);
        //Write the public key to "filename.pub"
        kpair.writePublicKey(filename+".pub", comment);
        //Print the key fingerprint
        Console.WriteLine("Finger print: "+kpair.getFingerPrint());
        //Free resources
        kpair.dispose();
      }
      catch(Exception e)
      {
        Console.WriteLine(e);
      }
      Environment.Exit(0);
    }
  }
}