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Implement OpenPGP_SecretKeyPacket

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Stephen Paul Weber 2010-03-31 18:54:00 -05:00
parent 6e8dc4799f
commit 6ac274b8ec
1 changed files with 47 additions and 1 deletions
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48
lib/openpgp.php
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@ -803,7 +803,53 @@ class OpenPGP_PublicSubkeyPacket extends OpenPGP_PublicKeyPacket {
* @see http://tools.ietf.org/html/rfc4880#section-12
*/
class OpenPGP_SecretKeyPacket extends OpenPGP_PublicKeyPacket {
// TODO
public $s2k_useage, $s2k_type, $s2k_hash_algorithm, $s2k_salt, $s2k_count, $symmetric_type, $private_hash, $encrypted_data;
function read() {
parent::read(); // All the fields from PublicKey
$this->s2k_useage = ord($this->read_byte());
if($this->s2k_useage == 255 || $this->s2k_useage == 254) {
$this->symmetric_type = ord($this->read_byte());
$this->s2k_type = ord($this->read_byte());
$this->s2k_hash_algorithm = ord($this->read_byte());
if($this->s2k_type == 1 || $this->s2k_type == 3) $this->s2k_salt = $this->read_bytes(8);
if($this->s2k_type == 3) {
$c = ord($this->read_byte());
$this->s2k_count = ((int)16 + ($c & 15)) << (($c >> 4) + 6);
}
} else if($this->s2k_useage > 0) {
$this->symmetric_type = $this->s2k_useage;
}
if($this->s2k_useage > 0) {
// TODO: IV of the same length as cipher's block size
$this->encrypted_data = $this->input; // Rest of input is MPIs and checksum (encrypted)
} else {
$this->data = $this->input; // Rest of input is MPIs and checksum
$this->key_from_data();
}
}
function key_from_data() {
if(!$this->data) return NULL; // Not decrypted yet
$this->input = $this->data;
static $key_fields = array(
1 => array('d', 'p', 'q', 'u'), // RSA
16 => array('x'), // ELG-E
17 => array('x'), // DSA
);
foreach($key_fields[$this->algorithm] as $field) {
$this->key[$field] = $this->read_mpi();
}
// TODO: Validate checksum?
if($this->s2k_useage == 254) { // 20 octet sha1 hash
$this->private_hash = $this->read_bytes(20);
} else { // two-octet checksum
$this->private_hash = $this->read_bytes(2);
}
unset($this->input);
}
}
/**