PHP で CryptoJS で暗号化されたパスワードを復号化する方法は?

<code class="php">$saltHex = $_POST['salt'];  // Received from the JavaScript request
$ciphertextHex = $_POST['ciphertext'];  // Received from the JavaScript request

// Convert salt from hex to binary
$salt = hex2bin($saltHex);

function evpKDF($password, $salt, $keySize, $ivSize) {
    $hasher = hash_init('sha256');
    hash_update($hasher, $password);
    hash_update($hasher, $salt);
    $derivedBytes = hash_final($hasher, TRUE);

    return array(
        "key" => substr($derivedBytes, 0, $keySize),
        "iv" => substr($derivedBytes, $keySize, $ivSize)
    );
}

// Derive key and IV from passphrase and salt
$keyAndIV = evpKDF("Secret Passphrase", $salt, 16, 16);

// Decrypt ciphertext using mcrypt_decrypt()
$decryptPassword = mcrypt_decrypt(MCRYPT_RIJNDAEL_128,
    $keyAndIV["key"],
    hex2bin($ciphertextHex),
    MCRYPT_MODE_CBC,
    $keyAndIV["iv"]);</code>