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<a href="https://gitlab.com/dueno">Daiki Ueno</a>
commented on a discussion
on <a href="https://gitlab.com/gnutls/gnutls/merge_requests/987#note_171500214">tests/tls-neg-ext4-key.c</a>:
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<pre style="margin: 0;"> <span id="LC444" class="line" lang="c">     <span class="p">.</span><span class="n" style="color: #333;">sig</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">GNUTLS_SIGN_RSA_PSS_SHA256</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC445" class="line" lang="c">     <span class="p">.</span><span class="n" style="color: #333;">exp_kx</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">GNUTLS_KX_ECDHE_RSA</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC446" class="line" lang="c">    <span class="p">},</span></span>
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<pre style="margin: 0;">-<span id="LC447" class="line" lang="c">    <span class="p">{.</span><span class="n" style="color: #333;">name</span> <span class="o" style="font-weight: 600;">=</span> <span class="s" style="color: #d14;">"tls1.3 rsa-pss cert, rsa-sign key"</span><span class="p">,</span> <span class="cm" style="color: #998; font-style: italic;">/* we expect the server to <span class="idiff left right">refuse negotiating</span> */</span></span>
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<pre style="margin: 0;">+<span id="LC447" class="line" lang="c">    <span class="p">{.</span><span class="n" style="color: #333;">name</span> <span class="o" style="font-weight: 600;">=</span> <span class="s" style="color: #d14;">"tls1.3 rsa-pss cert, rsa-sign key"</span><span class="p">,</span> <span class="cm" style="color: #998; font-style: italic;">/* we expect the server to <span class="idiff left right">attempt to downgrade to TLS 1.2, but it is not possible because it is not enabled</span> */</span></span>
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<pre style="margin: 0;"> <span id="LC448" class="line" lang="c">     <span class="p">.</span><span class="n" style="color: #333;">pk</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">GNUTLS_PK_RSA</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC449" class="line" lang="c">     <span class="p">.</span><span class="n" style="color: #333;">prio</span> <span class="o" style="font-weight: 600;">=</span> <span class="s" style="color: #d14;">"NORMAL:-VERS-ALL:+VERS-TLS1.3"</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC450" class="line" lang="c">     <span class="p">.</span><span class="n" style="color: #333;">cert</span> <span class="o" style="font-weight: 600;">=</span> <span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">server_ca3_rsa_pss_cert</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC451" class="line" lang="c">     <span class="p">.</span><span class="n" style="color: #333;">key</span> <span class="o" style="font-weight: 600;">=</span> <span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">server_ca3_rsa_pss_key</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC452" class="line" lang="c">     <span class="p">.</span><span class="n" style="color: #333;">sig</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">GNUTLS_SIGN_RSA_SHA256</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC453" class="line" lang="c">     <span class="p">.</span><span class="n" style="color: #333;">exp_kx</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">GNUTLS_KX_ECDHE_RSA</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC454" class="line" lang="c">     <span class="p">.</span><span class="n" style="color: #333;">exp_serv_err</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">GNUTLS_E_INSUFFICIENT_SECURITY</span></span>
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<p dir="auto">OK, after discussing off-line, removed the special case for FFDHE in <code>lib/algorithms/ciphersuites.c</code>.</p>
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