How to decrypt with CryptoJS using AES?

User 3197788

With the desired options (AES, ECB mode and PKCS7), as the question suggests, I can't seem to get the decrypted value right.

I am encrypting like this:

  var ENC_KEY = "bXlrZXk=";  //"mykey"

  var encrypted = CryptoJS.AES.encrypt("hello",  CryptoJS.enc.Base64.parse(ENC_KEY), 
    {
        mode: CryptoJS.mode.ECB,
        padding: CryptoJS.pad.Pkcs7
    });
  console.log('encrypted: ' + encrypted);

It works as expected and outputs the encrypted value I expect, but when I decrypt it using the method below, I end up with an empty object:

var decrypted = CryptoJS.AES.decrypt(encrypted, CryptoJS.enc.Base64.parse(ENC_KEY), 
    {
        mode: CryptoJS.mode.ECB,
        padding: CryptoJS.pad.Pkcs7
    });
    console.log('decrypted: ' + decrypted);

I have also tried using:

console.log('encrypted is decrypted to: ' + decrypted.toString(CryptoJS.enc.Utf8);

but no joy...

Neil Damon

I tried it in a fiddle (with some modifications to make it work):

//decrypt gives a hex
function hex2a(hexx) {
    var hex = hexx.toString();//force conversion
    var str = '';
    for (var i = 0; i < hex.length; i += 2)
        str += String.fromCharCode(parseInt(hex.substr(i, 2), 16));
    return str;
}

var key = CryptoJS.enc.Base64.parse("Secret Passphrase"); 

alert(key);

var encrypted = CryptoJS.AES.encrypt("hello",  key, 
    {
        mode: CryptoJS.mode.ECB
    });

alert('encrypted: ' + encrypted);

var decrypted = CryptoJS.AES.decrypt(encrypted, key, 
    {
        mode: CryptoJS.mode.ECB
    });

alert('decrypted: ' + hex2a(decrypted));

http://jsfiddle.net/gttL705r/

and found that the decryption returned a hex (probably not a string)...could that be causing your problem? So with the quick hex2ascii function, 'hello' is returned :)

I also removed the specified padding because Pkcs7 is said to be the default in the documentation, but I can't find the src js I need to download.

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