In an effort to protect my database information, I have implemented encryption using simple mcrypt functions for handling JSON data. Here are the functions I've created:
function encrypt($key, $data){
$encrypted_data = mcrypt_cbc(MCRYPT_RIJNDAEL_192, $key, $data, MCRYPT_ENCRYPT);
return base64_encode($encrypted_data);
}
function decrypt($key, $encryptedData){
$decrypt = mcrypt_cbc(MCRYPT_RIJNDAEL_192, $key, base64_decode($encryptedData), MCRYPT_DECRYPT);
return $decrypt;
}
After testing the functionality of json_decode without encryption, everything seemed to be working fine. However, upon encrypting and decrypting the data before decoding it with json_decode, I encountered a problem where it only returned NULL.
To pinpoint the issue, I created a simple debugging script as shown below:
include("coreFunctions.php");
$arr = '{"number":"4646464646","type":"home"}';
$key = "ladida";
$locked = encrypt($key, $arr);
var_dump($locked);
var_dump(json_decode(decrypt($key, $locked), true));
Upon verifying that the output of the decryption process is identical to the input, I am puzzled by why this unexpected behavior is occurring.
UPDATE
Further investigation revealed that the length of the data before and after encryption differs. How can I ensure consistency in the data length throughout the encryption process or correct it afterwards?