219 lines
6.8 KiB
PHP
219 lines
6.8 KiB
PHP
<?php
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/** @package php-gpg::GPG */
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/** require supporting files */
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require_once("Expanded_Key.php");
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define("PK_TYPE_ELGAMAL", 1);
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define("PK_TYPE_RSA", 0);
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define("PK_TYPE_UNKNOWN", -1);
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/**
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* Pure PHP implementation of PHP/GPG public key
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*
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* @package php-gpg::GPG
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* @link http://www.verysimple.com/
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* @copyright 1997-2011 VerySimple, Inc.
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* @license http://www.gnu.org/licenses/lgpl.html LGPL
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* @todo implement decryption
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* @version 1.0
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*/
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class GPG_Public_Key {
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var $version;
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var $fp;
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var $key_id;
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var $user;
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var $public_key;
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var $type;
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function IsValid()
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{
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return $this->version != -1 && $this->GetKeyType() != PK_TYPE_UNKNOWN;
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}
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function GetKeyType()
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{
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if (!strcmp($this->type, "ELGAMAL")) return PK_TYPE_ELGAMAL;
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if (!strcmp($this->type, "RSA")) return PK_TYPE_RSA;
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return PK_TYPE_UNKNOWN;
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}
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function GetFingerprint()
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{
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return strtoupper( trim(chunk_split($this->fp, 4, ' ')) );
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}
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function GetKeyId()
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{
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return (strlen($this->key_id) == 16) ? strtoupper($this->key_id) : '0000000000000000';
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}
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function GetPublicKey()
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{
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return str_replace("\n", "", $this->public_key);
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}
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function GPG_Public_Key($asc) {
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$found = 0;
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// normalize line breaks
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$asc = str_replace("\r\n", "\n", $asc);
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if (strpos($asc, "-----BEGIN PGP PUBLIC KEY BLOCK-----\n") === false)
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throw new Exception("Missing header block in Public Key");
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if (strpos($asc, "\n\n") === false)
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throw new Exception("Missing body delimiter in Public Key");
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if (strpos($asc, "\n-----END PGP PUBLIC KEY BLOCK-----") === false)
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throw new Exception("Missing footer block in Public Key");
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// get rid of everything except the base64 encoded key
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$headerbody = explode("\n\n", str_replace("\n-----END PGP PUBLIC KEY BLOCK-----", "", $asc), 2);
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$asc = trim($headerbody[1]);
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$len = 0;
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$s = base64_decode($asc);
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$sa = str_split($s);
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for($i = 0; $i < strlen($s);) {
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$tag = ord($sa[$i++]);
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// echo 'TAG=' . $tag . '/';
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if(($tag & 128) == 0) break;
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if($tag & 64) {
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$tag &= 63;
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$len = ord($sa[$i++]);
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if ($len > 191 && $len < 224) $len = (($len - 192) << 8) + ord($sa[$i++]);
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else if ($len == 255) $len = (ord($sa[$i++]) << 24) + (ord($sa[$i++]) << 16) + (ord($sa[$i++]) << 8) + ord($sa[$i++]);
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else if ($len > 223 && $len < 255) $len = (1 << ($len & 0x1f));
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} else {
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$len = $tag & 3;
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$tag = ($tag >> 2) & 15;
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if ($len == 0) $len = ord($sa[$i++]);
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else if($len == 1) $len = (ord($sa[$i++]) << 8) + ord($sa[$i++]);
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else if($len == 2) $len = (ord($sa[$i++]) << 24) + (ord($sa[$i++]) << 16) + (ord($sa[$i++]) << 8) + ord($sa[$i++]);
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else $len = strlen($s) - 1;
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}
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// echo $tag . ' ';
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if ($tag == 6 || $tag == 14) {
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$k = $i;
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$version = ord($sa[$i++]);
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$found = 1;
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$this->version = $version;
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$time = (ord($sa[$i++]) << 24) + (ord($sa[$i++]) << 16) + (ord($sa[$i++]) << 8) + ord($sa[$i++]);
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if($version == 2 || $version == 3) $valid = ord($sa[$i++]) << 8 + ord($sa[$i++]);
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$algo = ord($sa[$i++]);
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if($algo == 1 || $algo == 2) {
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$m = $i;
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$lm = floor((ord($sa[$i]) * 256 + ord($sa[$i + 1]) + 7) / 8);
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$i += $lm + 2;
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$mod = substr($s, $m, $lm + 2);
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$le = floor((ord($sa[$i]) * 256 + ord($sa[$i+1]) + 7) / 8);
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$i += $le + 2;
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$this->public_key = base64_encode(substr($s, $m, $lm + $le + 4));
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$this->type = "RSA";
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if ($version == 3) {
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$this->fp = '';
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$this->key_id = bin2hex(substr($mod, strlen($mod) - 8, 8));
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} else if($version == 4) {
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// https://tools.ietf.org/html/rfc4880#section-12
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$headerPos = strpos($s, chr(0x04)); // TODO: is this always the correct starting point for the pulic key packet 'version' field?
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$delim = chr(0x01) . chr(0x00); // TODO: is this the correct delimiter for the end of the public key packet?
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$delimPos = strpos($s, $delim) + (3-$headerPos);
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// echo "POSITION: $delimPos\n";
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// this does not work, tried it with RSA 1024 and RSA 4096 keys generated by GnuPG v2 (2.0.29) on Windows running Apache and PHP 5.6.3
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// $pkt = chr(0x99) . chr($delimPos >> 8) . chr($delimPos & 255) . substr($s, $headerPos, $delimPos);
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// this is the original signing string which seems to have only worked for key lengths of 1024 or less
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$pkt = chr(0x99) . chr($len >> 8) . chr($len & 255) . substr($s, $k, $len); // use this for now
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$fp = sha1($pkt);
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$this->fp = $fp;
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$this->key_id = substr($fp, strlen($fp) - 16, 16);
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// uncomment to debug the start point for the signing string
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// for ($ii = 5; $ii > -1; $ii--) {
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// $pkt = chr(0x99) . chr($ii >> 8) . chr($ii & 255) . substr($s, $headerPos, $ii);
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// $fp = sha1($pkt);
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// echo "LENGTH=" . $headerPos . '->' . $ii . " CHR(" . ord(substr($s,$ii, 1)) . ") = " . substr($fp, strlen($fp) - 16, 16) . "\n";
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// }
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// echo "\n";
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// uncomment to debug the end point for the signing string
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// for ($ii = strlen($s); $ii > 1; $ii--) {
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// $pkt = chr(0x99) . chr($ii >> 8) . chr($ii & 255) . substr($s, $headerPos, $ii);
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// $fp = sha1($pkt);
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// echo "LENGTH=" . $headerPos . '->' . $ii . " CHR(" . ord(substr($s,$ii, 1)) . ") = " . substr($fp, strlen($fp) - 16, 16) . "\n";
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// }
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} else {
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throw new Exception('GPG Key Version ' . $version . ' is not supported');
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}
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$found = 2;
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} else if(($algo == 16 || $algo == 20) && $version == 4) {
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$m = $i;
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$lp = floor((ord($sa[$i]) * 256 + ord($sa[$i +1]) + 7) / 8);
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$i += $lp + 2;
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$lg = floor((ord($sa[$i]) * 256 + ord($sa[$i + 1]) + 7) / 8);
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$i += $lg + 2;
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$ly = floor((ord($sa[$i]) * 256 + ord($sa[$i + 1]) + 7)/8);
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$i += $ly + 2;
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$this->public_key = base64_encode(substr($s, $m, $lp + $lg + $ly + 6));
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// TODO: should this be adjusted as it was for RSA (above)..?
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$pkt = chr(0x99) . chr($len >> 8) . chr($len & 255) . substr($s, $k, $len);
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$fp = sha1($pkt);
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$this->fp = $fp;
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$this->key_id = substr($fp, strlen($fp) - 16, 16);
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$this->type = "ELGAMAL";
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$found = 3;
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} else {
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$i = $k + $len;
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}
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} else if ($tag == 13) {
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$this->user = substr($s, $i, $len);
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$i += $len;
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} else {
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$i += $len;
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}
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}
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if($found < 2) {
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throw new Exception("Unable to parse Public Key");
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// $this->version = "";
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// $this->fp = "";
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// $this->key_id = "";
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// $this->user = "";
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// $this->public_key = "";
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}
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}
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function GetExpandedKey()
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{
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$ek = new Expanded_Key($this->public_key);
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}
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}
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?>
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