import java.security.MessageDigest;

import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
import javax.xml.bind.DatatypeConverter;

public class AES {
	private static byte[] iv = "0000000000000000".getBytes();

	private static String decrypt(String encrypted, String seed)
 throws Exception {
		byte[] keyb = seed.getBytes("utf-8");
		MessageDigest md = MessageDigest.getInstance("SHA-256");
		byte[] thedigest = md.digest(keyb);
		SecretKeySpec skey = new SecretKeySpec(thedigest, "AES");
		Cipher dcipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
		dcipher.init(Cipher.DECRYPT_MODE, skey, new IvParameterSpec(iv));

		byte[] clearbyte = dcipher.doFinal(DatatypeConverter
				.parseHexBinary(encrypted));
		return new String(clearbyte);
	}

	public static String encrypt(String content, String key) throws Exception {
		byte[] input = content.getBytes("utf-8");

		MessageDigest md = MessageDigest.getInstance("SHA-256");
		byte[] thedigest = md.digest(key.getBytes("utf-8"));
		SecretKeySpec skc = new SecretKeySpec(thedigest, "AES");
		Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
		cipher.init(Cipher.ENCRYPT_MODE, skc, new IvParameterSpec(iv));

		byte[] cipherText = new byte[cipher.getOutputSize(input.length)];
		int ctLength = cipher.update(input, 0, input.length, cipherText, 0);
		ctLength += cipher.doFinal(cipherText, ctLength);
		return DatatypeConverter.printHexBinary(cipherText);
	}

	public static void main(String[] args) throws Exception {
		String data = "hello";
		String key = "hi";
		String cipher = AES.encrypt(data, key);
		String decipher = AES.decrypt(cipher, key);
		System.out.println(cipher);
		System.out.println(decipher);
	}
}


$ javac AES.java
$ java AES
DD0D07B77C1606C97A1B10AC8D9AC180
hello


var crypto = require('crypto');

var iv = new Buffer('0000000000000000');
var encrypt = function(data, key) {
	var decodeKey = crypto.createHash('sha256').update(key, 'utf-8').digest();
	var cipher = crypto.createCipheriv('aes-256-cbc', decodeKey, iv);
	return cipher.update(data, 'utf8', 'hex') + cipher.final('hex');
};

var decrypt = function(data, key) {
	var encodeKey = crypto.createHash('sha256').update(key, 'utf-8').digest();
	var cipher = crypto.createDecipheriv('aes-256-cbc', encodeKey, iv);
	return cipher.update(data, 'hex', 'utf8') + cipher.final('utf8');
};

var data = 'hello'
var key = 'hi';
var cipher = encrypt(data, key);
var decipher = decrypt(cipher, key);
console.log(cipher);
console.log(decipher);


 node aes.js
dd0d07b77c1606c97a1b10ac8d9ac180
hello