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<?php
$fp = fopen("subdap-oberon.pem", "r");
$pubd = fread($fp, 262144);
fclose($fp);
$pub = openssl_get_publickey($pubd);
$args = array();
foreach (explode('&', $argv[1]) as $parm) {
$s = split('=', $parm);
$args[$s[0]] = $s[1];
}
$sig = $args['sig'];
$sig = str_replace('-', '+', $sig);
$sig = str_replace('_', '/', $sig);
$sig = base64_decode($sig, true);
$data = sprintf("%s:%d:%s", $args['site'], $args['ts'], $args['user']);
if (openssl_verify($data, $sig, $pub, "SHA256")) {
printf("OK: site=%s ts=%s user=%s\n", $args['site'], $args['ts'], $args['user']);
} else {
print "verify failed\n";
}
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