crypto_exaple.js

var crypto = require('crypto');

var passphrase = new Buffer("xxxxx");
var data = "secret data to protect";

var cipher = crypto.createCipher('aes192', passphrase);
cipher.update(data, 'utf8');

var result_buf = cipher.final(); //=> SlowBuffer

var result_hex = result_buf.toString('hex');
var input_buf = new Buffer(result_hex, 'hex');

console.log('now decrypting by SlowBuffer');

var decipher1 = crypto.createDecipher('aes192', passphrase);
decipher1.update(result_buf); // SlowBuffer
var decrypto1 = decipher1.final('utf8');

console.log('now decrypting by Buffer');

var decipher2 = crypto.createDecipher('aes192', passphrase);
decipher2.update(input_buf); // Buffer
var decrypto2 = decipher2.final('utf8');