ParagonIE_Sodium_Compat::base642bin

    public static function base642bin($encoded, $variant, $ignore = '')
    {
        /* Type checks: */
        ParagonIE_Sodium_Core_Util::declareScalarType($encoded, 'string', 1);

        /** @var string $encoded */
        $encoded = (string) $encoded;
        if (ParagonIE_Sodium_Core_Util::strlen($encoded) === 0) {
            return '';
        }

        // Just strip before decoding
        if (!empty($ignore)) {
            $encoded = str_replace($ignore, '', $encoded);
        }

        try {
            switch ($variant) {
                case self::BASE64_VARIANT_ORIGINAL:
                    return ParagonIE_Sodium_Core_Base64_Original::decode($encoded, true);
                case self::BASE64_VARIANT_ORIGINAL_NO_PADDING:
                    return ParagonIE_Sodium_Core_Base64_Original::decode($encoded, false);
                case self::BASE64_VARIANT_URLSAFE:
                    return ParagonIE_Sodium_Core_Base64_UrlSafe::decode($encoded, true);
                case self::BASE64_VARIANT_URLSAFE_NO_PADDING:
                    return ParagonIE_Sodium_Core_Base64_UrlSafe::decode($encoded, false);
                default:
                    throw new SodiumException('invalid base64 variant identifier');
            }
        } catch (Exception $ex) {
            if ($ex instanceof SodiumException) {
                throw $ex;
            }
            throw new SodiumException('invalid base64 string');
        }
    }