<?php

namespace Leenooks\OpenPGP;

/**
 * OpenPGP Symmetric-Key Encrypted Session Key packet (tag 3).
 *
 * @see http://tools.ietf.org/html/rfc4880#section-5.3
 */
class SymmetricSessionKeyPacket extends Packet
{
	protected $tag = 3;
	public $version, $symmetric_algorithm, $s2k, $encrypted_data;

	function __construct($s2k=NULL,$encrypted_data='',$symmetric_algorithm=9,$version=3)
	{
		parent::__construct();
		$this->version = $version;
		$this->symmetric_algorithm = $symmetric_algorithm;
		$this->s2k = $s2k;
		$this->encrypted_data = $encrypted_data;
	}

	function body()
	{
		return chr($this->version) . chr($this->symmetric_algorithm) .
			$this->s2k->to_bytes() . $this->encrypted_data;
	}

	function read()
	{
		$this->version = ord($this->read_byte());
		$this->symmetric_algorithm = ord($this->read_byte());
		$this->s2k = OpenPGP\S2k::parse($this->input);
		$this->encrypted_data = $this->input;
	}
}