Code
<?php
# vim: ft=php
function is_pgp($my_string) {
$begin = strpos($my_string, "-----BEGIN PGP");
if ($begin === false) {
return false;
}
$sign = strpos($my_string, "----BEGIN PGP SIGN");
if ($sign !== false) {
return false;
}
$blank = strpos($my_string, "\r\n\r\n");
if ($blank === false) {
return false;
}
$end = strpos($my_string, "----END");
if ($end === false) {
return false;
}
if ($end < $begin) {
return false;
}
return true;
}
?>
<html>
<head><title>is_php</title></head>
<body>
<p>
<?php
if ($_POST['message'] != "") {
if(is_pgp($_POST['message'])==true) {
echo "I think the following text is a valid pgp encrypted message";
} else {
echo "The following text does not validate as a pgp encrypted message";
}
} else {echo "use the following form to test whether text is pgp encrypted"; }
?>
</p>
<form action=pgp.php method="post">
<textarea name="message" rows="20" cols="60" wrap="virtual">
<?php echo($_POST['message']); ?>
</textarea>
<input type="submit" value="validate text">
</form>
</body>
</html>