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Encrypt from Java and decrypt on Node.js
// Encrypt where jo is input, and query is output and ENCRPYTION_KEy is key
byte[] input = jo.toString().getBytes("utf-8");
MessageDigest md = MessageDigest.getInstance("MD5");
byte[] thedigest = md.digest(ENCRYPTION_KEY.getBytes("UTF-8"));
SecretKeySpec skc = new SecretKeySpec(thedigest, "AES/ECB/PKCS5Padding");
Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, skc);
byte[] cipherText = new byte[cipher.getOutputSize(input.length)];
int ctLength = cipher.update(input, 0, input.length, cipherText, 0);
ctLength += cipher.doFinal(cipherText, ctLength);
String query = Base64.encodeToString(cipherText, Base64.DEFAULT);
var decipher = crypto.createDecipher('aes-128-ecb', encryption_key);
chunks = []
chunks.push( decipher.update( new Buffer(fullBuffer, "base64").toString("binary")) );
chunks.push('binary') );
var txt = chunks.join("");
txt = new Buffer(txt, "binary").toString("utf-8");
// where encryption_key = key, fullBuffer is the input and txt is output

jibbo commented Apr 16, 2013

Very useful, thank you!

After some minor tweaking this worked perfectly for me!
Thank you very much!

Getting a ... on the java side

Exception in thread "main" Wrong algorithm: AES or Rijndael required
at com.sun.crypto.provider.SunJCE_c.a(DashoA13_..)
at com.sun.crypto.provider.SunJCE_g.a(DashoA13_..)
at com.sun.crypto.provider.SunJCE_f.a(DashoA13_..)
at com.sun.crypto.provider.SunJCE_f.a(DashoA13_..)
at com.sun.crypto.provider.AESCipher.engineInit(DashoA13_..)
at javax.crypto.Cipher.a(DashoA13_..)
at javax.crypto.Cipher.a(DashoA13_..)
at javax.crypto.Cipher.init(DashoA13_..)
at javax.crypto.Cipher.init(DashoA13*..)
at ci.ThirdCipher.main(

Thanks for posting. You just saved me a lot of time. The only change I made was:
SecretKeySpec skc = new SecretKeySpec(thedigest, "AES/ECB/PKCS5Padding");
SecretKeySpec skc = new SecretKeySpec(thedigest, "AES");

girish3 commented Sep 18, 2014

I used it in my Android code....Thanks dude

Super helpful. Thanks a ton for posting this

I used "sha-1" for message digest. how should the node equivalent code be changed.

ricky07 commented Oct 21, 2015

Can you please help me to write same encryption for Java script.

@ricky07 try this

var encrypt = function(data, key) {
var cipher = crypto.createCipher('aes-128-ecb', key);
return cipher.update(data, 'utf8', 'base64') +'base64');

var decrypt = function(data, key) {
var decipher = crypto.createDecipher('aes-128-ecb', key);
return decipher.update(data, 'base64', 'utf8') +'utf8');

can someone please show me the code to DECRYPT on android (using the same spec as encrypting outlined above)

Hi man, great code.
What is license to use ?

siddo420 commented Feb 2, 2016

can you also write an example on how to encrypt using Javascript (Node.js)?

I am trying to encrypt secure token. See

xexi commented Aug 8, 2016

work like a charm 👍

tuananh commented Apr 12, 2017


Can anyone help me how to convert this java snippet to nodejs equivalent?

byte[] key = nonce.getBytes("UTF-8");
MessageDigest messageDigest = MessageDigest.getInstance("SHA-1");
key = messageDigest.digest(key);
key = Arrays.copyOf(key, 16);
SecretKeySpec secretKeySpec = new SecretKeySpec(key, "AES");
Cipher ecipherSymmetric = Cipher.getInstance("AES");
ecipherSymmetric.init(Cipher.ENCRYPT_MODE, secretKeySpec);

LuizGC commented May 17, 2017

Very nice, @kennydude. This tip helps me a lot.l

Thank you!

neeraj87 commented Sep 7, 2017

That was amazing. Thanks a ton.

public static String encrypt(byte[] plaintext) throws Exception, NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException {

    PublicKey key = readPublicKey(publicKeyUrl1);
    Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
    System.out.println("file content: " + key);//44
    cipher.init(Cipher.ENCRYPT_MODE, key);
    byte[] encryptedByte = cipher.doFinal(plaintext);
    String encodedString = new String(java.util.Base64.getEncoder().encode(encryptedByte));
    return encodedString;
}                please convert node js code 
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