80 lines
2.2 KiB
PHP
80 lines
2.2 KiB
PHP
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<?php
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namespace Leenooks\OpenPGP;
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/**
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* OpenPGP Secret-Key packet (tag 5).
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*
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* @see http://tools.ietf.org/html/rfc4880#section-5.5.1.3
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* @see http://tools.ietf.org/html/rfc4880#section-5.5.3
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* @see http://tools.ietf.org/html/rfc4880#section-11.2
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* @see http://tools.ietf.org/html/rfc4880#section-12
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*/
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class SecretKeyPacket extends PublicKeyPacket
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{
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protected $tag = 5;
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public $s2k_useage, $s2k, $symmetric_algorithm, $private_hash, $encrypted_data;
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static $secret_key_fields = array(
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1 => array('d', 'p', 'q', 'u'), // RSA
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2 => array('d', 'p', 'q', 'u'), // RSA-E
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3 => array('d', 'p', 'q', 'u'), // RSA-S
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16 => array('x'), // ELG-E
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17 => array('x'), // DSA
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);
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function body()
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{
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$bytes = parent::body() . chr($this->s2k_useage);
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$secret_material = NULL;
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if($this->s2k_useage == 255 || $this->s2k_useage == 254) {
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$bytes .= chr($this->symmetric_algorithm);
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$bytes .= $this->s2k->to_bytes();
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}
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if($this->s2k_useage > 0) {
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$bytes .= $this->encrypted_data;
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} else {
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$secret_material = '';
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foreach(self::$secret_key_fields[$this->algorithm] as $f) {
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$f = $this->key[$f];
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$secret_material .= pack('n', \Leenooks\OpenPGP::bitlength($f));
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$secret_material .= $f;
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}
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$bytes .= $secret_material;
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// 2-octet checksum
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$chk = 0;
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for($i = 0; $i < strlen($secret_material); $i++) {
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$chk = ($chk + ord($secret_material[$i])) % 65536;
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}
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$bytes .= pack('n', $chk);
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}
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return $bytes;
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}
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function key_from_input()
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{
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foreach(self::$secret_key_fields[$this->algorithm] as $field) {
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$this->key[$field] = $this->read_mpi();
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}
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}
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function read()
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{
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parent::read(); // All the fields from PublicKey
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$this->s2k_useage = ord($this->read_byte());
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if($this->s2k_useage == 255 || $this->s2k_useage == 254) {
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$this->symmetric_algorithm = ord($this->read_byte());
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$this->s2k = OpenPGP\S2K::parse($this->input);
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} else if($this->s2k_useage > 0) {
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$this->symmetric_algorithm = $this->s2k_useage;
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}
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if($this->s2k_useage > 0) {
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$this->encrypted_data = $this->input; // Rest of input is MPIs and checksum (encrypted)
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} else {
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$this->key_from_input();
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$this->private_hash = $this->read_bytes(2); // TODO: Validate checksum?
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}
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}
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}
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