[gnutls-devel] GnuTLS | Missing/wrong checks in lib/ext/pre_shared_key.c (server_recv_params) (#523)

[Daiki Ueno]

@tomato42 I would say it's unrelated; it's failing in checking ticket lifetime.

Currently, tlsfuzzer calculates the ticket age as the seconds from the Unix epoch.  This is not correct, you need to use the difference from the time when NST is received.  So:

```
ticket_time = int(nst.time + nst.ticket_age_add) % 2**32
```
should be:
```
ticket_time = int((time.time() - nst.time) * 1000 + nst.ticket_age_add) % 2**32
```

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