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<p dir="auto">Thank you Robert for bringing that up. Is that the issue we discussed at: <a href="https://github.com/tomato42/tlsfuzzer/issues/398" rel="nofollow noreferrer noopener" target="_blank">https://github.com/tomato42/tlsfuzzer/issues/398</a></p>
<p dir="auto">If yes, I think my reply to that is still relevant, and I'm not sure we want to address it. Quoting below</p>
<blockquote dir="auto">
<p>To add some context this test is about the <a href="https://tools.ietf.org/html/rfc8446#section-4.1.2" rel="nofollow noreferrer noopener" target="_blank">https://tools.ietf.org/html/rfc8446#section-4.1.2</a> requirement:</p>
</blockquote>
<pre class="code highlight js-syntax-highlight plaintext" lang="plaintext" v-pre="true"><code><span id="LC1" class="line" lang="plaintext"> The client will also send a </span>
<span id="LC2" class="line" lang="plaintext"> ClientHello when the server has responded to its ClientHello with a</span>
<span id="LC3" class="line" lang="plaintext"> HelloRetryRequest. In that case, the client MUST send the same</span>
<span id="LC4" class="line" lang="plaintext"> ClientHello without modification, except as follows:</span>
<span id="LC5" class="line" lang="plaintext"></span>
<span id="LC6" class="line" lang="plaintext"> - If a "key_share" extension was supplied in the HelloRetryRequest,</span>
<span id="LC7" class="line" lang="plaintext"> replacing the list of shares with a list containing a single</span>
<span id="LC8" class="line" lang="plaintext"> KeyShareEntry from the indicated group.</span>
<span id="LC9" class="line" lang="plaintext"></span>
<span id="LC10" class="line" lang="plaintext"> - Removing the "early_data" extension (Section 4.2.10) if one was</span>
<span id="LC11" class="line" lang="plaintext"> present. Early data is not permitted after a HelloRetryRequest.</span>
<span id="LC12" class="line" lang="plaintext"></span>
<span id="LC13" class="line" lang="plaintext"> - Including a "cookie" extension if one was provided in the</span>
<span id="LC14" class="line" lang="plaintext"> HelloRetryRequest.</span>
<span id="LC15" class="line" lang="plaintext"></span>
<span id="LC16" class="line" lang="plaintext"> - Updating the "pre_shared_key" extension if present by recomputing</span>
<span id="LC17" class="line" lang="plaintext"> the "obfuscated_ticket_age" and binder values and (optionally)</span>
<span id="LC18" class="line" lang="plaintext"> removing any PSKs which are incompatible with the server's</span>
<span id="LC19" class="line" lang="plaintext"> indicated cipher suite.</span>
<span id="LC20" class="line" lang="plaintext"></span>
<span id="LC21" class="line" lang="plaintext"> - Optionally adding, removing, or changing the length of the</span>
<span id="LC22" class="line" lang="plaintext"> "padding" extension [RFC7685].</span>
<span id="LC23" class="line" lang="plaintext"></span>
<span id="LC24" class="line" lang="plaintext"> - Other modifications that may be allowed by an extension defined in</span>
<span id="LC25" class="line" lang="plaintext"> the future and present in the HelloRetryRequest.</span></code></pre>
<blockquote dir="auto">
<p>So that's a nice test to verify whether the server enforces that behavior (like tlslite-ng), but since the MUST is on the client to follow the rules, and not on the server to enforce, both behaviors look acceptable.</p>
</blockquote>
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