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<a href="https://gitlab.com/babelouest">Nicolas Mora</a>
commented on a
discussion on <a href="https://gitlab.com/gnutls/gnutls/-/merge_requests/1395#note_534050838">lib/ecdh.c</a>:
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> */</span></span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#include "gnutls_int.h"</span></span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#include <ecdh.h></span></span>
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<pre style="margin: 0;">+<span id="LC28" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#include "errors.h"</span></span>
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<pre style="margin: 0;">+<span id="LC29" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC30" class="line" lang="c"><span class="kt" style="color: #458; font-weight: 600;">int</span> <span class="nf" style="color: #900; font-weight: 600;">gnutls_ecdh_compute_key</span><span class="p">(</span><span class="n" style="color: #333;">gnutls_privkey_t</span> <span class="n" style="color: #333;">privkey</span><span class="p">,</span> <span class="n" style="color: #333;">gnutls_pubkey_t</span> <span class="n" style="color: #333;">pubkey</span><span class="p">,</span> <span class="n" style="color: #333;">gnutls_datum_t</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">Z</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC31" class="line" lang="c"><span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC32" class="line" lang="c"> <span class="n" style="color: #333;">gnutls_ecc_curve_t</span> <span class="n" style="color: #333;">curve_pub</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">GNUTLS_ECC_CURVE_INVALID</span><span class="p">,</span> <span class="n" style="color: #333;">curve_priv</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">GNUTLS_ECC_CURVE_INVALID</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">unsigned</span> <span class="kt" style="color: #458; font-weight: 600;">int</span> <span class="n" style="color: #333;">bits_pub</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">0</span><span class="p">,</span> <span class="n" style="color: #333;">bits_priv</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">0</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="c"> <span class="n" style="color: #333;">gnutls_datum_t</span> <span class="n" style="color: #333;">priv_x</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">{</span><span class="nb" style="color: #0086b3;">NULL</span><span class="p">,</span> <span class="mi" style="color: #099;">0</span><span class="p">},</span> <span class="n" style="color: #333;">priv_y</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">{</span><span class="nb" style="color: #0086b3;">NULL</span><span class="p">,</span> <span class="mi" style="color: #099;">0</span><span class="p">},</span> <span class="n" style="color: #333;">priv_k</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">{</span><span class="nb" style="color: #0086b3;">NULL</span><span class="p">,</span> <span class="mi" style="color: #099;">0</span><span class="p">},</span> <span class="n" style="color: #333;">pub_x</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">{</span><span class="nb" style="color: #0086b3;">NULL</span><span class="p">,</span> <span class="mi" style="color: #099;">0</span><span class="p">},</span> <span class="n" style="color: #333;">pub_y</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">{</span><span class="nb" style="color: #0086b3;">NULL</span><span class="p">,</span> <span class="mi" style="color: #099;">0</span><span class="p">};</span></span>
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<pre style="margin: 0;">+<span id="LC35" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">int</span> <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 class="n" style="color: #333;">res</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC36" class="line" lang="c"> </span>
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<pre style="margin: 0;">+<span id="LC37" class="line" lang="c"> <span class="n" style="color: #333;">Z</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">data</span> <span class="o" style="font-weight: 600;">=</span> <span class="nb" style="color: #0086b3;">NULL</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC38" class="line" lang="c"> <span class="n" style="color: #333;">Z</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">size</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">0</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC39" class="line" lang="c"> </span>
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<pre style="margin: 0;">+<span id="LC40" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">gnutls_privkey_get_pk_algorithm</span><span class="p">(</span><span class="n" style="color: #333;">privkey</span><span class="p">,</span> <span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">bits_priv</span><span class="p">)</span> <span class="o" style="font-weight: 600;">!=</span> <span class="n" style="color: #333;">GNUTLS_PK_ECDSA</span><span class="p">)</span></span>
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<p dir="auto">Curve25519/Curve448 don't have a 'y' coordinate, so <code>_gnutls_ecdh_compute_key</code> wouldn't work.</p>
<p dir="auto">I can use <code>_gnutls_dh_compute_key</code> for Curve25519/Curve448 if I assume it's the right way.</p>
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