src/Robin/Ntlm/Crypt/Des/AbstractDesEncrypter.php
protected function processKey($raw_key)
    {
        $key = $raw_key;

        if ($this->expand_and_normalize_keys) {
            $key = self::expand56BitKeyTo64BitKey($key, true);
        }

        return $key;
    }
protected function processKey($raw_key)
    {
        $key = $raw_key;

        if ($this->expand_and_normalize_keys) {
            $key = self::expand56BitKeyTo64BitKey($key, true);
        }

        return $key;
    }
Process a key for DES encryption.

Optionally performs an expansion and normalization process to the key.

@param string $raw_key The raw key.
@return string The processed key.