ssh-keygen.js

var spawn = require('child_process').spawn,
	sys = require('sys');

function createSSH(passphrase, path, name) {

	var ssh = spawn('ssh-keygen', ['-trsa', '-N \''+ passphrase +'\'', '-f ' + name], { cwd:path, env: process.env, customFds: [-1, -1, -1]})

	ssh.on('exit', function (code, signal) {
       process.exit();
	});

	 ssh.stdout.on('data', function (out) {
       process.stdout.write(out);
     });

     ssh.stderr.on('data', function (err) {
       process.stdout.write('err: '+ err);
     });  
};

createSSH('joshua', '/node', 'id_rsa');