I need to encrypt some values in Java application using AES algorithm, and decrypt the same in my Javascript module of my application.

I saw some examples over the internet but it seems there's some differences in patibility.

like below issue :

AES encryption in javascript and decrypting in java

Can someone please point me some code examples to solve this issue.

Thanks.

I need to encrypt some values in Java application using AES algorithm, and decrypt the same in my Javascript module of my application.

I saw some examples over the internet but it seems there's some differences in patibility.

like below issue :

AES encryption in javascript and decrypting in java

Can someone please point me some code examples to solve this issue.

Thanks.

• java
• javascript
• android

• What have you tried? What is this "differences in patibility" problem? – Oleg Estekhin Commented Apr 27, 2014 at 11:05
• I am facing this problem stackoverflow./questions/20323765/… – brig Commented Apr 27, 2014 at 12:03
• Found a way to fix it: stackoverflow./a/34677506/701875 – Andrei Karpuszonak Commented Jan 8, 2016 at 12:49

1 Answer 1

AES is an exactly specified algorithm, so all AES implementations must be "patible". Having said that, AES is a variable-key-length block-cipher, operating on 128-bit blocks. To actually use this in a piece of software, you have to make a bunch of other choices: how to deal with input consisting of more than 1 block (this is called the "mode"), in some modes you need an initialization vector, you need to deal with input not consisting of an exact number of blocks (padding), how to encode characters into bytes, and how to represent bytes in a context (like a source file) that doesn't support that. All those things need to be patible.

Below is a tested example. It uses the standard Java crypto functions (and Apache Commons Codec), and JavaScript crypto library crypto-js. Choices are as follows: 128-bit key, cipher-block-chaining mode (which needs an initialization vector), PKCS5/7 padding, UTF-8 for character encoding, Base64 to represent byte arrays.

This piece of Java will output Base64-encoded ciphertext:

String plainText = "Hello, World! This is a Java/Javascript AES test.";
SecretKey key = new SecretKeySpec(
    Base64.decodeBase64("u/Gu5posvwDsXUnV5Zaq4g=="), "AES");
AlgorithmParameterSpec iv = new IvParameterSpec(
    Base64.decodeBase64("5D9r9ZVzEYYgha93/aUK2w==")); 
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, key, iv);
System.out.println(Base64.encodeBase64String(cipher.doFinal(
    plainText.getBytes("UTF-8"))));

This piece of JavaScript correctly decrypts it:

<script src="http://crypto-js.googlecode./svn/tags/3.1.2/build/rollups/aes.js"></script>
<script>
var encrypted = CryptoJS.enc.Base64.parse('3Q7r1iqtaRuJCo6QHA9/GhkTmbl4VkitV9ZsD3K2VB7LuBNg4enkJUA1cF8cHyovUH2N/jFz3kbq0QsHfPByCg==');
var key = CryptoJS.enc.Base64.parse('u/Gu5posvwDsXUnV5Zaq4g==');
var iv = CryptoJS.enc.Base64.parse('5D9r9ZVzEYYgha93/aUK2w==');
document.write(CryptoJS.enc.Utf8.stringify(CryptoJS.AES.decrypt(
    { ciphertext: encrypted },
    key, 
    { mode: CryptoJS.mode.CBC, padding: CryptoJS.pad.Pkcs7, iv: iv,  })));
</script>