/**
* Decrypts a string. Returns the raw binary plaintext.
*
* $ciphertext MUST start with the IV followed by the ciphertext, even for EBC data (the first block of data is
* dropped in EBC mode since there is no concept of IV in EBC).
*
* WARNING: The returned plaintext is zero-padded to the algorithm's block size during encryption. You are advised
* to trim the string to the original plaintext's length upon decryption. While rtrim($decrypted, "\0") sounds
* appealing it's NOT the correct approach for binary data (zero bytes may actually be part of your plaintext, not
* just padding!).
*
* @param string $cipherText The ciphertext to encrypt
* @param string $key The raw binary key (will be zero-padded or chopped if its size is different than the block size)
*
* @return string The raw unencrypted binary string.
*/
public function decrypt($cipherText, $key);