Node.js script to encrypt and decrypt an arbitrary string using 128-bit AES method in CFB mode

crypt.js

/*!
 * Node.js script to encrypt and decrypt an arbitrary string using
 * 128-bit AES method in CFB mode.
 *
 */

// A 16-byte key is required for a 128-bit encryption
var crypto = require('crypto'),
	key = new Buffer('sixteen byte key'),
	iv = crypto.randomBytes(16),
	orig = 'A confidential message.';

console.log('  original msg:', orig);

// Start encrypt
//console.log(' iv1:', iv.toString('hex'));
var cipher = crypto.createCipheriv('aes-128-cfb',
	     key.toString('utf8'), iv.toString('binary'));

var enc = cipher.update(orig, 'utf8', 'hex');
enc += cipher.final('hex');

// Append enc message to iv to create an encrypted message
enc = iv.toString('hex') + enc;
console.log(" encrypted msg:", enc);

// Start decrypt
// Get new iv from the encrypted message; first 32 characters
var new_iv = new Buffer(enc.slice(0, 32), 'hex');
//console.log(' iv2:', new_iv.toString('hex'));

var decipher = crypto.createDecipheriv('aes-128-cfb',
	       key.toString('utf8'), new_iv.toString('binary'));

console.log('encrypted data:', enc.slice(32));
var recv = decipher.update(enc.slice(32), 'hex', 'utf8');
recv += decipher.final('utf8');

console.log("  received msg:", orig);