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<a href="https://gitlab.com/dueno">Daiki Ueno</a>
<a href="https://gitlab.com/gnutls/gnutls/-/merge_requests/2095#note_3260134885">commented</a>:
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<p dir="auto" style="color: #3a383f; margin: 0px 0px 1rem;" align="initial">Note that the <code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; margin-top: 0px; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;'>signature_algorithms_cert</code> extension is not widely used; none of OpenSSL, NSS, and GnuTLS handles the extension (OpenSSL does send it, but doesn't recognize it).</p>
<p dir="auto" style="color: #3a383f; margin: 0px 0px 1rem;" align="initial">In the <a href="https://gitlab.com/gnutls/gnutls/-/blob/master/lib/tls13/certificate_request.c#L115" style="margin-top: 0px;">parse_cert_extension</a> function you mentioned in <a href="https://gitlab.com/gnutls/gnutls/-/work_items/1842" title="Client Authentication broken with Java 17.0.17+ (and recent versions of Java)" class="gfm gfm-issue" data-original="#1842" data-link="false" data-link-reference="false" data-issue="188491164" data-project="179611" data-iid="1842" data-namespace-path="gnutls/gnutls" data-project-path="gnutls/gnutls" data-issue-type="issue" data-container="body" data-placement="top" data-reference-type="issue">#1842</a>, the values come from the <code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;'>signature_algorithms</code> extension (not the <code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;'>signature_algorithms_cert</code> extension) attached to Certificate Request message, meaning that the server requests a cert signed with an algorithm listed in the extension, while the client has only RSA signed certificate.</p>
<p dir="auto" style="color: #3a383f; margin: 0px;" align="initial">According to your comment on <a href="https://gitlab.com/gnutls/gnutls/-/work_items/1842" title="Client Authentication broken with Java 17.0.17+ (and recent versions of Java)" class="gfm gfm-issue" data-original="#1842" data-link="false" data-link-reference="false" data-issue="188491164" data-project="179611" data-iid="1842" data-namespace-path="gnutls/gnutls" data-project-path="gnutls/gnutls" data-issue-type="issue" data-container="body" data-placement="top" data-reference-type="issue" style="margin-top: 0px;">#1842</a>, the server wants either ecdsa_<em>, ed25519, ed448, or rsa_pss</em>. If the server is indicating rsa_pss_rsae_* (not rsa_pss_pss_*), the client should be able to present the (non-restricted) RSA certificates. Could you check that, maybe using wireshark (see <a href="https://wiki.wireshark.org/TLS" rel="nofollow noreferrer noopener" target="_blank">https://wiki.wireshark.org/TLS</a>)?</p>
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