AES encrypt & decrypt in java and nodejs

AES.java

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(Base64.decode(encrypted, Base64.DEFAULT));
    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 Base64.encodeToString(cipherText, Base64.DEFAULT);
}

AES.js

var crypto = require('crypto');
var iv = new Buffer('0000000000000000');
// reference to converting between buffers http://nodejs.org/api/buffer.html#buffer_new_buffer_str_encoding
// reference node crypto api http://nodejs.org/api/crypto.html#crypto_crypto_createcipheriv_algorithm_key_iv
// reference to ECB vs CBC cipher methods http://crypto.stackexchange.com/questions/225/should-i-use-ecb-or-cbc-encryption-mode-for-my-block-cipher

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', 'base64') + cipher.final('base64');
};

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, 'base64', 'utf8') + cipher.final('utf8');
};