deon/openpgp-php
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Merge pull request #9 from adecaneda/Partial-body-lengths

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Support for Partial body lengths
This commit is contained in:
Stephen Paul Weber 2015-08-14 13:15:15 -05:00
commit f4fabd04e7
1 changed files with 31 additions and 13 deletions
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44
lib/openpgp.php
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@ -412,24 +412,41 @@ class OpenPGP_Packet {
/**
* Parses an OpenPGP packet.
*
* Partial body lengths based on https://github.com/toofishes/python-pgpdump/blob/master/pgpdump/packet.py
*
* @see http://tools.ietf.org/html/rfc4880#section-4.2
*/
static function parse(&$input) {
$packet = NULL;
if (strlen($input) > 0) {
$parser = ord($input[0]) & 64 ? 'parse_new_format' : 'parse_old_format';
list($tag, $head_length, $data_length) = self::$parser($input);
$input = substr($input, $head_length);
$header_start0 = 0;
$consumed = 0;
$packet_data = "";
do {
list($tag, $data_offset, $data_length, $partial) = self::$parser($input, $header_start0);
$data_start0 = $header_start0 + $data_offset;
$header_start0 = $data_start0 + $data_length - 1;
$packet_data .= substr($input, $data_start0, $data_length);
$consumed += $data_offset + $data_length;
if ($partial) {
$consumed -= 1;
}
} while ($partial === true && $parser === 'parse_new_format');
if ($tag && ($class = self::class_for($tag))) {
$packet = new $class();
$packet->tag = $tag;
$packet->input = substr($input, 0, $data_length);
$packet->length = $data_length;
$packet->input = $packet_data;
$packet->length = strlen($packet_data);
$packet->read();
unset($packet->input);
unset($packet->length);
}
$input = substr($input, $data_length);
$input = substr($input, $consumed);
}
return $packet;
}
@ -439,20 +456,21 @@ class OpenPGP_Packet {
*
* @see http://tools.ietf.org/html/rfc4880#section-4.2.2
*/
static function parse_new_format($input) {
static function parse_new_format($input, $header_start = 0) {
$tag = ord($input[0]) & 63;
$len = ord($input[1]);
$len = ord($input[$header_start + 1]);
if($len < 192) { // One octet length
return array($tag, 2, $len);
return array($tag, 2, $len, false);
}
if($len > 191 && $len < 224) { // Two octet length
return array($tag, 3, (($len - 192) << 8) + ord($input[2]) + 192);
return array($tag, 3, (($len - 192) << 8) + ord($input[$header_start + 2]) + 192, false);
}
if($len == 255) { // Five octet length
$unpacked = unpack('N', substr($input, 2, 4));
return array($tag, 6, reset($unpacked));
$unpacked = unpack('N', substr($input, $header_start + 2, 4));
return array($tag, 6, reset($unpacked), false);
}
// TODO: Partial body lengths. 1 << ($len & 0x1F)
// Partial body lengths
return array($tag, 2, 1 << ($len & 0x1f), true);
}
/**
@ -483,7 +501,7 @@ class OpenPGP_Packet {
$data_length = strlen($input) - $head_length;
break;
}
return array($tag, $head_length, $data_length);
return array($tag, $head_length, $data_length, false);
}
function __construct($data=NULL) {