friendica_2021-01/mod/modexp.php

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PHP
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<?php
require_once('library/asn1.php');
function modexp_init(App $a) {
if($a->argc != 2)
killme();
$nick = $a->argv[1];
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$r = q("SELECT `spubkey` FROM `user` WHERE `nickname` = '%s' LIMIT 1",
dbesc($nick)
);
if (! dbm::is_result($r)) {
killme();
}
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$lines = explode("\n",$r[0]['spubkey']);
unset($lines[0]);
unset($lines[count($lines)]);
$x = base64_decode(implode('',$lines));
$r = ASN_BASE::parseASNString($x);
$m = $r[0]->asnData[1]->asnData[0]->asnData[0]->asnData;
$e = $r[0]->asnData[1]->asnData[0]->asnData[1]->asnData;
header("Content-type: application/magic-public-key");
echo 'RSA' . '.' . $m . '.' . $e ;
killme();
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}