217 lines
No EOL
6.7 KiB
PHP
217 lines
No EOL
6.7 KiB
PHP
<?php
|
|
/** @package php-gpg::GPG */
|
|
|
|
/** require supporting files */
|
|
require_once("Expanded_Key.php");
|
|
|
|
define("PK_TYPE_ELGAMAL", 1);
|
|
define("PK_TYPE_RSA", 0);
|
|
define("PK_TYPE_UNKNOWN", -1);
|
|
|
|
/**
|
|
* Pure PHP implementation of PHP/GPG public key
|
|
*
|
|
* @package php-gpg::GPG
|
|
* @link http://www.verysimple.com/
|
|
* @copyright 1997-2011 VerySimple, Inc.
|
|
* @license http://www.gnu.org/licenses/lgpl.html LGPL
|
|
* @todo implement decryption
|
|
* @version 1.0
|
|
*/
|
|
class GPG_Public_Key {
|
|
var $version;
|
|
var $fp;
|
|
var $key_id;
|
|
var $user;
|
|
var $public_key;
|
|
var $type;
|
|
|
|
function IsValid()
|
|
{
|
|
return $this->version != -1 && $this->GetKeyType() != PK_TYPE_UNKNOWN;
|
|
}
|
|
|
|
function GetKeyType()
|
|
{
|
|
if (!strcmp($this->type, "ELGAMAL")) return PK_TYPE_ELGAMAL;
|
|
if (!strcmp($this->type, "RSA")) return PK_TYPE_RSA;
|
|
return PK_TYPE_UNKNOWN;
|
|
}
|
|
|
|
function GetFingerprint()
|
|
{
|
|
return strtoupper( trim(chunk_split($this->fp, 4, ' ')) );
|
|
}
|
|
|
|
function GetKeyId()
|
|
{
|
|
return (strlen($this->key_id) == 16) ? strtoupper($this->key_id) : '0000000000000000';
|
|
}
|
|
|
|
function GetPublicKey()
|
|
{
|
|
return str_replace("\n", "", $this->public_key);
|
|
}
|
|
|
|
function GPG_Public_Key($asc) {
|
|
$found = 0;
|
|
|
|
// normalize line breaks
|
|
$asc = str_replace("\r\n", "\n", $asc);
|
|
|
|
if (strpos($asc, "-----BEGIN PGP PUBLIC KEY BLOCK-----\n") === false)
|
|
throw new Exception("Missing header block in Public Key");
|
|
|
|
if (strpos($asc, "\n\n") === false)
|
|
throw new Exception("Missing body delimiter in Public Key");
|
|
|
|
if (strpos($asc, "\n-----END PGP PUBLIC KEY BLOCK-----") === false)
|
|
throw new Exception("Missing footer block in Public Key");
|
|
|
|
// get rid of everything except the base64 encoded key
|
|
$headerbody = explode("\n\n", str_replace("\n-----END PGP PUBLIC KEY BLOCK-----", "", $asc), 2);
|
|
$asc = trim($headerbody[1]);
|
|
|
|
|
|
$len = 0;
|
|
$s = base64_decode($asc);
|
|
$sa = str_split($s);
|
|
|
|
for($i = 0; $i < strlen($s);) {
|
|
$tag = ord($sa[$i++]);
|
|
|
|
// echo 'TAG=' . $tag . '/';
|
|
|
|
if(($tag & 128) == 0) break;
|
|
|
|
if($tag & 64) {
|
|
$tag &= 63;
|
|
$len = ord($sa[$i++]);
|
|
if ($len > 191 && $len < 224) $len = (($len - 192) << 8) + ord($sa[$i++]);
|
|
else if ($len == 255) $len = (ord($sa[$i++]) << 24) + (ord($sa[$i++]) << 16) + (ord($sa[$i++]) << 8) + ord($sa[$i++]);
|
|
else if ($len > 223 && len < 255) $len = (1 << ($len & 0x1f));
|
|
} else {
|
|
$len = $tag & 3;
|
|
$tag = ($tag >> 2) & 15;
|
|
if ($len == 0) $len = ord($sa[$i++]);
|
|
else if($len == 1) $len = (ord($sa[$i++]) << 8) + ord($sa[$i++]);
|
|
else if($len == 2) $len = (ord($sa[$i++]) << 24) + (ord($sa[$i++]) << 16) + (ord($sa[$i++]) << 8) + ord($sa[$i++]);
|
|
else $len = strlen($s) - 1;
|
|
}
|
|
|
|
// echo $tag . ' ';
|
|
|
|
if ($tag == 6 || $tag == 14) {
|
|
$k = $i;
|
|
$version = ord($sa[$i++]);
|
|
$found = 1;
|
|
$this->version = $version;
|
|
|
|
$time = (ord($sa[$i++]) << 24) + (ord($sa[$i++]) << 16) + (ord($sa[$i++]) << 8) + ord($sa[$i++]);
|
|
|
|
if($version == 2 || $version == 3) $valid = ord($sa[$i++]) << 8 + ord($sa[$i++]);
|
|
|
|
$algo = ord($sa[$i++]);
|
|
|
|
if($algo == 1 || $algo == 2) {
|
|
$m = $i;
|
|
$lm = floor((ord($sa[$i]) * 256 + ord($sa[$i + 1]) + 7) / 8);
|
|
$i += $lm + 2;
|
|
|
|
$mod = substr($s, $m, $lm + 2);
|
|
$le = floor((ord($sa[$i]) * 256 + ord($sa[$i+1]) + 7) / 8);
|
|
$i += $le + 2;
|
|
|
|
$this->public_key = base64_encode(substr($s, $m, $lm + $le + 4));
|
|
$this->type = "RSA";
|
|
|
|
if ($version == 3) {
|
|
$this->fp = '';
|
|
$this->key_id = bin2hex(substr($mod, strlen($mod) - 8, 8));
|
|
} else if($version == 4) {
|
|
|
|
// https://tools.ietf.org/html/rfc4880#section-12
|
|
$headerPos = strpos($s, chr(0x04)); // TODO: is this always the correct starting point for the pulic key packet 'version' field?
|
|
$delim = chr(0x01) . chr(0x00); // TODO: is this the correct delimiter for the end of the public key packet?
|
|
$delimPos = strpos($s, $delim) + (3-$headerPos);
|
|
|
|
// echo "POSITION: $delimPos\n";
|
|
|
|
$pkt = chr(0x99) . chr($delimPos >> 8) . chr($delimPos & 255) . substr($s, $headerPos, $delimPos);
|
|
|
|
// this is the original signing string which seems to have only worked for key lengths of 1024 or less
|
|
//$pkt = chr(0x99) . chr($len >> 8) . chr($len & 255) . substr($s, $k, $len);
|
|
|
|
$fp = sha1($pkt);
|
|
$this->fp = $fp;
|
|
$this->key_id = substr($fp, strlen($fp) - 16, 16);
|
|
|
|
// uncomment to debug the start point for the signing string
|
|
// for ($ii = 5; $ii > -1; $ii--) {
|
|
// $pkt = chr(0x99) . chr($ii >> 8) . chr($ii & 255) . substr($s, $headerPos, $ii);
|
|
// $fp = sha1($pkt);
|
|
// echo "LENGTH=" . $headerPos . '->' . $ii . " CHR(" . ord(substr($s,$ii, 1)) . ") = " . substr($fp, strlen($fp) - 16, 16) . "\n";
|
|
// }
|
|
// echo "\n";
|
|
|
|
// uncomment to debug the end point for the signing string
|
|
// for ($ii = strlen($s); $ii > 1; $ii--) {
|
|
// $pkt = chr(0x99) . chr($ii >> 8) . chr($ii & 255) . substr($s, $headerPos, $ii);
|
|
// $fp = sha1($pkt);
|
|
// echo "LENGTH=" . $headerPos . '->' . $ii . " CHR(" . ord(substr($s,$ii, 1)) . ") = " . substr($fp, strlen($fp) - 16, 16) . "\n";
|
|
// }
|
|
} else {
|
|
throw new Exception('GPG Key Version ' . $version . ' is not supported');
|
|
}
|
|
$found = 2;
|
|
} else if(($algo == 16 || $algo == 20) && $version == 4) {
|
|
$m = $i;
|
|
|
|
$lp = floor((ord($sa[$i]) * 256 + ord($sa[$i +1]) + 7) / 8);
|
|
$i += $lp + 2;
|
|
|
|
$lg = floor((ord($sa[$i]) * 256 + ord($sa[$i + 1]) + 7) / 8);
|
|
$i += $lg + 2;
|
|
|
|
$ly = floor((ord($sa[$i]) * 256 + ord($sa[$i + 1]) + 7)/8);
|
|
$i += $ly + 2;
|
|
|
|
$this->public_key = base64_encode(substr($s, $m, $lp + $lg + $ly + 6));
|
|
|
|
// TODO: should this be adjusted as it was for RSA (above)..?
|
|
|
|
$pkt = chr(0x99) . chr($len >> 8) . chr($len & 255) . substr($s, $k, $len);
|
|
$fp = sha1($pkt);
|
|
$this->fp = $fp;
|
|
$this->key_id = substr($fp, strlen($fp) - 16, 16);
|
|
$this->type = "ELGAMAL";
|
|
$found = 3;
|
|
} else {
|
|
$i = $k + $len;
|
|
}
|
|
} else if ($tag == 13) {
|
|
$this->user = substr($s, $i, $len);
|
|
$i += $len;
|
|
} else {
|
|
$i += $len;
|
|
}
|
|
}
|
|
|
|
if($found < 2) {
|
|
|
|
throw new Exception("Unable to parse Public Key");
|
|
// $this->version = "";
|
|
// $this->fp = "";
|
|
// $this->key_id = "";
|
|
// $this->user = "";
|
|
// $this->public_key = "";
|
|
}
|
|
}
|
|
|
|
function GetExpandedKey()
|
|
{
|
|
$ek = new Expanded_Key($this->public_key);
|
|
}
|
|
}
|
|
|
|
?>
|