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<p dir="auto">I am not going to provide a fix, since I neither understand cryptography and bits very well, nor the internals of GnuTLS. A reproducer:</p>
<pre class="code highlight js-syntax-highlight diff" lang="diff" v-pre="true"><code><span id="LC1" class="line" lang="diff"><span class="gh">diff --git a/tests/pubkey-import-export.c b/tests/pubkey-import-export.c</span></span>
<span id="LC2" class="line" lang="diff"><span class="gd">--- a/tests/pubkey-import-export.c</span></span>
<span id="LC3" class="line" lang="diff"><span class="gi">+++ b/tests/pubkey-import-export.c</span></span>
<span id="LC4" class="line" lang="diff"><span class="gu">@@ -285,6 +285,10 @@ int check_pubkey_import_export(void)</span></span>
<span id="LC5" class="line" lang="diff"> if (ret < 0)</span>
<span id="LC6" class="line" lang="diff"> fail("error\n");</span>
<span id="LC7" class="line" lang="diff"> </span>
<span id="LC8" class="line" lang="diff"><span class="gi">+ gnutls_pubkey_get_pk_algorithm(key, &ret);</span></span>
<span id="LC9" class="line" lang="diff"><span class="gi">+ if (ret == 0)</span></span>
<span id="LC10" class="line" lang="diff"><span class="gi">+ fail("error: key size is zero\n");</span></span>
<span id="LC11" class="line" lang="diff"><span class="gi">+</span></span>
<span id="LC12" class="line" lang="diff"> ret = gnutls_pubkey_verify_params(key);</span>
<span id="LC13" class="line" lang="diff"> if (ret != 0)</span>
<span id="LC14" class="line" lang="diff"> fail("error: %s\n", gnutls_strerror(ret));</span></code></pre>
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