What were you trying to do that didn't work?

Use zlib certificate compression with tstclnt/selfserv on s390x.

What is the impact of this issue to you?

I try to not attach personally to such stuff, but that leaves cert compression as implemented in NSS broken on big-endian platforms.

Please provide the package NVR for which the bug is seen:

nss-3.112.0-2.el10_0

How reproducible is this bug?:

reliably

Steps to reproduce

1. selfserv -n server -d sql:nssdb -q -p 4433
2. connect with openssl, gnutls or tlsfuzzer's test-tls13-certificate-compression.py

Expected results

cert compression works

Actual results

handshake_failed alerts from NSS

Fix

https://phabricator.services.mozilla.com/D259453