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<a href="https://gitlab.com/boaks">Achim Kraus</a> created an issue <a href="https://gitlab.com/gnutls/gnutls/-/issues/1123">#1123</a>:
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<p dir="auto">I'm currently wondering, why gnutls version 3.5.18 and 3.6.15 reject to read a ec-private key generated by the java keytool.</p>
<p dir="auto">Using a demo key</p>
<pre class="code highlight js-syntax-highlight plaintext" lang="plaintext" v-pre="true"><code><span id="LC1" class="line" lang="plaintext">-----BEGIN PRIVATE KEY-----</span>
<span id="LC2" class="line" lang="plaintext">MEECAQAwEwYHKoZIzj0CAQYIKoZIzj0DAQcEJzAlAgEBBCBgNuyqKuRW0RxU1DVs</span>
<span id="LC3" class="line" lang="plaintext">aEpBPtVRVLRZYq6hZRzvZ6igBw==</span>
<span id="LC4" class="line" lang="plaintext">-----END PRIVATE KEY-----</span></code></pre>
<p dir="auto">for <code>gnutls_certificate_set_x509_key_file</code> I get:</p>
<p dir="auto">"gnutls_certificate_set_x509_key_file: 'ASN1 parser: Error in DER parsing.'"</p>
<p dir="auto">Using:</p>
<pre class="code highlight js-syntax-highlight plaintext" lang="plaintext" v-pre="true"><code><span id="LC1" class="line" lang="plaintext">-----BEGIN PRIVATE KEY-----</span>
<span id="LC2" class="line" lang="plaintext">MIGHAgEAMBMGByqGSM49AgEGCCqGSM49AwEHBG0wawIBAQQgYDbsqirkVtEcVNQ1</span>
<span id="LC3" class="line" lang="plaintext">bGhKQT7VUVS0WWKuoWUc72eooAehRANCAAQUaejXTuQWAngC8AFC+IT2FMmUR4Hj</span>
<span id="LC4" class="line" lang="plaintext">B9LcvnxDknyytbFK6cSCeIht+vSnxKHD4LVcBzMXEmufxKMUJWo4qOuu</span>
<span id="LC5" class="line" lang="plaintext">-----END PRIVATE KEY-----</span></code></pre>
<p dir="auto">works.</p>
<p dir="auto">The difference is the explicit public key as bit-string.
According <a href="https://tools.ietf.org/html/rfc5915#section-3" rel="nofollow noreferrer noopener" target="_blank">RFC 5915 - 3.  Elliptic Curve Private Key Format</a></p>
<blockquote dir="auto">
<p>Though the ASN.1 indicates publicKey is OPTIONAL, implementations that conform to this document SHOULD always include the publicKey field.</p>
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<p dir="auto">that field is optional. Even the <code>SHOULD</code> doesn't justify, why it seems to be required.</p>
<p dir="auto">Using <code>gnutls_certificate_set_x509_simple_pkcs12_file</code> unfortunately  also fails.</p>
<p dir="auto">Is there a trick, how to use the private key without the optional public one?</p>

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