JS CryptoJS encrypted -> PHP OpenSSL decrypted: cipher changes length

1 answer

I have a problem which i cant understand. I programmed some code to encrypt data in JS with CryptoJS and to decrypt this data in PHP with OpenSSL. Sometimes it work but most of the time it breaks

CODE:

    PHP          JS $passphrase == passkey 

JS:

let data = CryptoJS.AES.encrypt(data, passkey).toString(); send(data); 

PHP:

list($cipher, $salt) = decode($_POST["data"]); list($passkey, $iv) = evpkdf($passphrase, $salt);  $data = openssl_decrypt($cipher, "AES-256-CBC", $passkey, OPENSSL_RAW_DATA, $iv); echo $data  function evpkdf($passphrase, $salt) {     $salted = "";     $dx = "";     while(strlen($salted) < 48) {         $dx = md5($dx . $passphrase . $salt, true);         $salted .= $dx;     }     $passkey = substr($salted, 0, 32);     $iv = substr($salted, 32, 16);      return [$passkey, $iv]; }  function decode($data) {     $data = base64_decode($data);      if (substr($data, 0, 8) !== "Salted__") {         // throw new \InvalidArgumentException();         echo "no salt\n";     }      $salt = substr($data, 8, 8);     $cipher = substr($data, 16);      return [$cipher, $salt]; } 

RESULTS:

   PHP    JS     iv == iv   salt == salt cipher ?? cipher ?? = sometimes 

The only thing which i noticed was that the Cipher is not allways the same length and only if the cipher has the right length it worked. What could be my error which i cant see. I allready tried a lot and i really have no idea what to do. I tried to change the passkey in JS or to look if something else is different, but as above only the cipher doesnt make sense all the time.

All answers to this question, which has the identifier 61218188

The best answer:

What kind of pass key are you using to encrypt the data ?

CryptoJS supports AES-128, AES-192, and AES-256. It will pick the variant by the size of the key you pass in. If you use a passphrase, then it will generate a 256-bit key.

https://cryptojs.gitbook.io/docs/

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