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<a href="https://gitlab.com/Vrancken">Tom</a>
commented on a discussion
on <a href="https://gitlab.com/gnutls/gnutls/merge_requests/498#note_94677997">lib/ext/server_cert_type.c</a>:
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<td class="diff-line-num new new_line" data-linenumber="130" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC130" class="line" lang="c"> <span class="n" style="color: #333;">_gnutls_session_server_cert_type_set</span><span class="p">(</span><span class="n" style="color: #333;">session</span><span class="p">,</span> <span class="n" style="color: #333;">cert_type</span><span class="p">);</span></span>
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<td class="diff-line-num new new_line" data-linenumber="131" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC131" class="line" lang="c"> <span class="n" style="color: #333;">ret</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">GNUTLS_E_SUCCESS</span><span class="p">;</span></span>
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<td class="diff-line-num new new_line" data-linenumber="132" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
132
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<pre style="margin: 0;">+<span id="LC132" class="line" lang="c"> <span class="p">}</span> <span class="k" style="font-weight: 600;">else</span> <span class="p">{</span></span>
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<td class="diff-line-num new new_line" data-linenumber="133" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC133" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// No valid cert type found</span></span>
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<td class="diff-line-num new new_line" data-linenumber="134" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC134" class="line" lang="c"> <span class="n" style="color: #333;">ret</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">GNUTLS_E_UNSUPPORTED_CERTIFICATE_TYPE</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC135" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC136" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC137" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// Clean-up</span></span>
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<pre style="margin: 0;">+<span id="LC138" class="line" lang="c"> <span class="n" style="color: #333;">_gnutls_free_datum</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">cert_types</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC139" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC140" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span> <span class="n" style="color: #333;">ret</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC141" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC142" class="line" lang="c"> <span class="p">}</span> <span class="k" style="font-weight: 600;">else</span> <span class="c1" style="color: #998; font-style: italic;">// server mode</span></span>
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<pre style="margin: 0;">+<span id="LC143" class="line" lang="c"> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC144" class="line" lang="c"> <span class="c1" style="color: #998; font-style: italic;">// Compare packet length with expected packet length.</span></span>
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<pre style="margin: 0;">+<span id="LC145" class="line" lang="c"> <span class="n" style="color: #333;">DECR_LEN</span><span class="p">(</span><span class="n" style="color: #333;">len</span><span class="p">,</span> <span class="mi" style="color: #099;">1</span><span class="p">);</span></span>
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<p dir="auto">I think it would be possible because there are no other extensions that depend on the certificate type I think. But how would you enforce that this extension will be parsed after the PSK extension? By putting it lower in the <code>hello_ext_entry_st</code>? That is already the case in my implementation.</p>
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