smarcet / JOSE4PHP

         * sequence representing the compressed plaintext; otherwise, let M

         * be the octet sequence representing the plaintext.

         */

        if(!is_null($zip))

        {

            $compression__algorithm = CompressionAlgorithms_Registry::getInstance()->get($zip->getValue());

            $payload  = $compression__algorithm->compress($payload);

        }

        /**

         * Encrypt M using the CEK, the JWE Initialization Vector, and the

         * If a "zip" parameter was included, uncompress the decrypted

         * plaintext using the specified compression algorithm.

         */

        if(!is_null($zip))

        {

            $compression__algorithm = CompressionAlgorithms_Registry::getInstance()->get($zip->getValue());

            $plain_text = $compression__algorithm->uncompress($plain_text);

        }

        $this->setPayload(JWSPayloadFactory::build($plain_text));

        $this->should_decrypt = false;