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<a href="https://gitlab.com/simo5">Simo Sorce</a>
commented on a discussion
on <a href="https://gitlab.com/gnutls/gnutls/merge_requests/990#note_171505001">lib/nettle/pk.c</a>:
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<pre style="margin: 0;"> <span id="LC269" class="line" lang="c">                    <span class="k" style="font-weight: 600;">goto</span> <span class="n" style="color: #333;">dh_cleanup</span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC270" class="line" lang="c">            <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC271" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC272" class="line" lang="c">            <span class="cm" style="color: #998; font-style: italic;">/* if we have Q check that y ^ q mod p == 1 */</span></span>
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<pre style="margin: 0;">+<span id="LC273" class="line" lang="c">            <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">q</span> <span class="o" style="font-weight: 600;">!=</span> <span class="nb" style="color: #0086b3;">NULL</span><span class="p">)</span> <span class="p">{</span></span>
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<p dir="auto">Soooo,
the problem in using Q is that callers like the DH compute, use a structure with space for just two params (P, G), to get through the data to the lower layers.
Is it ok to change those structures to optionally host Q as well ?</p>
<p dir="auto">If that is fine (unsure if it breaks ABI) then I can easily pass in Q in tests (and CAVS tests will be able to do the same.</p>
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