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