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<a href="https://gitlab.com/dueno">Daiki Ueno</a>
commented:
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<p dir="auto">Since the salt size is always controlled through spki, why not just set it manually, before calling <code>gnutls_pubkey_verify_data2</code>:</p>
<pre class="code highlight js-syntax-highlight c" lang="c" v-pre="true"><code><span id="LC1" class="line" lang="c"> <span class="k">if</span> <span class="p">(</span><span class="n">tests</span><span class="p">[</span><span class="n">i</span><span class="p">].</span><span class="n">pk</span> <span class="o">==</span> <span class="n">GNUTLS_PK_RSA_PSS</span><span class="p">)</span> <span class="p">{</span></span>
<span id="LC2" class="line" lang="c"> <span class="n">gnutls_x509_spki_t</span> <span class="n">spki</span><span class="p">;</span></span>
<span id="LC3" class="line" lang="c"> <span class="n">gnutls_x509_spki_init</span><span class="p">(</span><span class="o">&</span><span class="n">spki</span><span class="p">);</span></span>
<span id="LC4" class="line" lang="c"> <span class="n">gnutls_x509_spki_set_rsa_pss_params</span><span class="p">(</span><span class="n">spki</span><span class="p">,</span> <span class="n">tests</span><span class="p">[</span><span class="n">i</span><span class="p">].</span><span class="n">digest</span><span class="p">,</span> <span class="mi">0</span><span class="p">);</span></span>
<span id="LC5" class="line" lang="c"> <span class="n">gnutls_pubkey_set_spki</span><span class="p">(</span><span class="n">pubkey</span><span class="p">,</span> <span class="n">spki</span><span class="p">,</span> <span class="mi">0</span><span class="p">);</span></span>
<span id="LC6" class="line" lang="c"> <span class="n">gnutls_x509_spki_deinit</span><span class="p">(</span><span class="n">spki</span><span class="p">);</span></span>
<span id="LC7" class="line" lang="c"> <span class="p">}</span></span></code></pre>
<p dir="auto">A fun fact is that, even if we use the reproducible construction, <code>getrandom</code> is always called for RSA blinding; so if the purpose of doing this is to avoid access to the random source, it wouldn't work out I'm afraid.</p>
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