Java and Nodejs on AES

If you are like me, having a legacy Java system, and developing a new Nodejs system. Somehow the new Nodejs system needs to talk to the Java based authentication system doing encryption or decryption. Here are the Java and Nodejs code using the same AES algorithm, which will enable the Java and Nodejs systems to talk to each other.

Java code:

AES.java

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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);	}}

Compile and run this Java program:

1234	$ javac AES.java $ java AESDD0D07B77C1606C97A1B10AC8D9AC180hello

Node code:

aes.js

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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);

Run the Node program:

123	$ node aes.js dd0d07b77c1606c97a1b10ac8d9ac180hello

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