long string cipher->base64 and decipher

long-string-cipher-base64.js

var c = require('crypto');

// cipher to binary
var cipher = c.createCipher('aes192', 'hello');
var en = cipher.update('你好你好你好你好你好dfferfdgwefdv4t5g56euhergy56yhe54wtfgq34tg你好你好你好你好你好你好你好erwgw43etr', 'utf8', 'binary') + cipher.final('binary');
console.log(en);

// binary to base64
var buff = new Buffer(en, 'binary');
var base64 = buff.toString('base64');
console.log(base64);

// base64 to utf8 (decipher)
var decipher = c.createDecipher('aes192', 'hello');
var de = decipher.update(base64, 'base64', 'utf8') + decipher.final('utf8');
console.log(de);