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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/1883#note_2158509634">lib/ext/key_share.c</a>:
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558
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<td class="new_line diff-line-num" data-linenumber="634" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #ececef; border-right-style: solid; padding: inherit;" align="right" bgcolor="#fbfafd">
634
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<td class="line_content" style="padding: inherit;"><pre style='display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'> <span id="LC634" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span> <span class="n" style="color: #333333;">gnutls_assert_val</span><span class="p">(</span></span>
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559
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<td class="new_line diff-line-num" data-linenumber="635" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #ececef; border-right-style: solid; padding: inherit;" align="right" bgcolor="#fbfafd">
635
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<td class="line_content" style="padding: inherit;"><pre style='display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'> <span id="LC635" class="line" lang="c"> <span class="n" style="color: #333333;">GNUTLS_E_RECEIVED_ILLEGAL_PARAMETER</span><span class="p">);</span></span>
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560
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636
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<td class="line_content" style="padding: inherit;"><pre style='display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'> <span id="LC636" class="line" lang="c"></span>
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<td class="old_line diff-line-num old" data-linenumber="561" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: inherit;" align="right" bgcolor="#f9d7dc">
561
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<td class="new_line diff-line-num old" data-linenumber="637" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: inherit;" align="right" bgcolor="#f9d7dc">
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<td class="line_content old" style="padding: inherit;" bgcolor="#fbe9eb"><pre style='display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>-<span id="LC561" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333333;">curve</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333333;">size</span> <span class="o" style="font-weight: 600;">*</span> <span class="mi" style="color: #009999;">2</span> <span class="o" style="font-weight: 600;">+</span> <span class="mi" style="color: #009999;">1</span> <span class="o" style="font-weight: 600;"><span class="idiff left deletion" style="background-color: #fac5cd;">!=</span></span><span class="idiff deletion" style="background-color: #fac5cd;"> </span><span class="n" style="color: #333333;"><span class="idiff right deletion" style="background-color: #fac5cd;">data_size</span></span><span class="p">)</span></span>
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<td class="old_line diff-line-num new" data-linenumber="562" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
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<td class="new_line diff-line-num new" data-linenumber="637" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
637
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC637" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333333;">curve</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333333;">size</span> <span class="o" style="font-weight: 600;">*</span> <span class="mi" style="color: #009999;">2</span> <span class="o" style="font-weight: 600;">+</span> <span class="mi" style="color: #009999;">1</span> <span class="o" style="font-weight: 600;"><span class="idiff left addition" style="background-color: #c7f0d2;">></span></span><span class="idiff addition" style="background-color: #c7f0d2;"> </span><span class="n" style="color: #333333;"><span class="idiff addition" style="background-color: #c7f0d2;">buffer</span></span><span class="o" style="font-weight: 600;"><span class="idiff addition" style="background-color: #c7f0d2;">-></span></span><span class="n" style="color: #333333;"><span class="idiff right addition" style="background-color: #c7f0d2;">length</span></span><span class="p">)</span></span>
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<td class="old_line diff-line-num" data-linenumber="562" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #ececef; border-right-style: solid; padding: inherit;" align="right" bgcolor="#fbfafd">
562
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<td class="new_line diff-line-num" data-linenumber="638" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #ececef; border-right-style: solid; padding: inherit;" align="right" bgcolor="#fbfafd">
638
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<td class="line_content" style="padding: inherit;"><pre style='display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'> <span id="LC638" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span> <span class="n" style="color: #333333;">gnutls_assert_val</span><span class="p">(</span></span>
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<td class="old_line diff-line-num" data-linenumber="563" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #ececef; border-right-style: solid; padding: inherit;" align="right" bgcolor="#fbfafd">
563
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<td class="new_line diff-line-num" data-linenumber="639" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #ececef; border-right-style: solid; padding: inherit;" align="right" bgcolor="#fbfafd">
639
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<td class="line_content" style="padding: inherit;"><pre style='display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'> <span id="LC639" class="line" lang="c"> <span class="n" style="color: #333333;">GNUTLS_E_RECEIVED_ILLEGAL_PARAMETER</span><span class="p">);</span></span>
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<td class="new_line diff-line-num new" data-linenumber="640" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
640
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC640" class="line" lang="c"> <span class="n" style="color: #333333;">_gnutls_buffer_pop_datum</span><span class="p">(</span><span class="n" style="color: #333333;">buffer</span><span class="p">,</span> <span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333333;">data</span><span class="p">,</span> <span class="n" style="color: #333333;">curve</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333333;">size</span> <span class="o" style="font-weight: 600;">*</span> <span class="mi" style="color: #009999;">2</span> <span class="o" style="font-weight: 600;">+</span> <span class="mi" style="color: #009999;">1</span><span class="p">);</span></span>
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564
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641
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<td class="line_content" style="padding: inherit;"><pre style='display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'> <span id="LC641" class="line" lang="c"></span>
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<td class="old_line diff-line-num" data-linenumber="565" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #ececef; border-right-style: solid; padding: inherit;" align="right" bgcolor="#fbfafd">
565
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<td class="new_line diff-line-num" data-linenumber="642" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #ececef; border-right-style: solid; padding: inherit;" align="right" bgcolor="#fbfafd">
642
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<td class="line_content" style="padding: inherit;"><pre style='display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'> <span id="LC642" class="line" lang="c"> <span class="cm" style="color: #999988; font-style: italic;">/* read the server's public key */</span></span>
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566
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<td class="new_line diff-line-num old" data-linenumber="643" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: inherit;" align="right" bgcolor="#f9d7dc">
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<td class="line_content old" style="padding: inherit;" bgcolor="#fbe9eb"><pre style='display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>-<span id="LC566" class="line" lang="c"> <span class="n" style="color: #333333;">ret</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333333;">_gnutls_ecc_ansi_x962_import</span><span class="p">(</span><span class="n" style="color: #333333;">data</span><span class="p">,</span> <span class="n" style="color: #333333;">data<span class="idiff left right deletion" style="background-color: #fac5cd;">_</span>size</span><span class="p">,</span></span>
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<td class="new_line diff-line-num new" data-linenumber="643" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
643
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #28272d; position: relative; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC643" class="line" lang="c"> <span class="n" style="color: #333333;">ret</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333333;">_gnutls_ecc_ansi_x962_import</span><span class="p">(</span><span class="n" style="color: #333333;">data</span><span class="p"><span class="idiff left addition" style="background-color: #c7f0d2;">.</span></span><span class="n" style="color: #333333;"><span class="idiff addition" style="background-color: #c7f0d2;">data</span></span><span class="p">,</span> <span class="n" style="color: #333333;">data</span><span class="p"><span class="idiff right addition" style="background-color: #c7f0d2;">.</span></span><span class="n" style="color: #333333;">size</span><span class="p">,</span></span>
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<p dir="auto" style="color: #28272d; margin: 0 0 16px;" align="initial">Not sure what kind of public key validation you mean, but:</p>
<ul dir="auto" style="text-align: initial; list-style-type: disc; margin: 0; padding: 0;">
<li style="margin-top: 0; line-height: 1.6em; margin-left: 25px; padding-left: 3px;">
<code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; margin-top: 0; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>_gnutls_ecc_ansi_x962_import</code> checks if the point is in the uncompressed format</li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;">
<code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; margin-top: 0; font-family: "GitLab Mono","JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>_gnutls_pk_derive</code> (the function calculates a shared secret) performs the SP800-56A full public key validation</li>
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