title: Get the AES key from an encrypted file using an already decrypted version of the same file
body: <p>Is that even possible? The encrypted file uses AES-128 in CBC mode. I already have its decrypted version, but I don't know the key that was used to encrypt it, and I need it (I prefer to not say the reason).</p>
  
  <p>I know both files are the same because the padding was disabled (they have the same size). I also know the Initialization Vector that was used in the encryption process, if that helps.</p>