http://mail.nowherejezfoltodf4jiyl6r56jnzintap5vyjlia7fkirfsnfizflqd.onion/HTB/Easy/30.html
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show $tokyo
> 2| class Tokyo {
3| private function sign($caCert,$userCsr) {
4| $caKey = file_get_contents('/home/nairobi/ca.key');
5| $userCert = openssl_csr_sign($userCsr, $caCert, $caKey, 365, ['digest_alg'=>'sha256']);
6| openssl_x509_export($userCert, $userCertOut);
7| return $userCertOut;
8| }
9| } Interestingly enough, the 4th line seems to pass the contents of a file named ca.key into the $caKey variable.