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<title>X25519</title>
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<ul id="index">
  <li><a href="#NAME">NAME</a></li>
  <li><a href="#DESCRIPTION">DESCRIPTION</a></li>
  <li><a href="#NOTES">NOTES</a></li>
  <li><a href="#EXAMPLES">EXAMPLES</a></li>
  <li><a href="#SEE-ALSO">SEE ALSO</a></li>
  <li><a href="#COPYRIGHT">COPYRIGHT</a></li>
</ul>

<p>X25519, X448 - EVP_PKEY X25519 and X448 support</p>

<h1 id="DESCRIPTION">DESCRIPTION</h1>

<p>The <b>X25519</b> and <b>X448</b> EVP_PKEY implementation supports key generation and key derivation using <b>X25519</b> and <b>X448</b>. It has associated private and public key formats compatible with RFC 8410.</p>

<p>No additional parameters can be set during key generation.</p>

<p>The peer public key must be set using EVP_PKEY_derive_set_peer() when performing key derivation.</p>

<h1 id="NOTES">NOTES</h1>

<p>A context for the <b>X25519</b> algorithm can be obtained by calling:</p>

<p>For the <b>X448</b> algorithm a context can be obtained by calling:</p>

<p>X25519 or X448 private keys can be set directly using <a href="../man3/EVP_PKEY_new_raw_private_key.html">EVP_PKEY_new_raw_private_key(3)</a> or loaded from a PKCS#8 private key file using <a href="../man3/PEM_read_bio_PrivateKey.html">PEM_read_bio_PrivateKey(3)</a> (or similar function). Completely new keys can also be generated (see the example below). Setting a private key also sets the associated public key.</p>

<p>X25519 or X448 public keys can be set directly using <a href="../man3/EVP_PKEY_new_raw_public_key.html">EVP_PKEY_new_raw_public_key(3)</a> or loaded from a SubjectPublicKeyInfo structure in a PEM file using <a href="../man3/PEM_read_bio_PUBKEY.html">PEM_read_bio_PUBKEY(3)</a> (or similar function).</p>

<h1 id="EXAMPLES">EXAMPLES</h1>

<p>This example generates an <b>X25519</b> private key and writes it to standard output in PEM format:</p>

<pre><code> #include &lt;openssl/evp.h&gt;
 #include &lt;openssl/pem.h&gt;
 ...
 EVP_PKEY *pkey = NULL;
 EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_X25519, NULL);
 EVP_PKEY_keygen_init(pctx);
 EVP_PKEY_keygen(pctx, &amp;pkey);
 EVP_PKEY_CTX_free(pctx);
 PEM_write_PrivateKey(stdout, pkey, NULL, NULL, 0, NULL, NULL);</code></pre>

<p>The key derivation example in <a href="../man3/EVP_PKEY_derive.html">EVP_PKEY_derive(3)</a> can be used with <b>X25519</b> and <b>X448</b>.</p>

<p><a href="../man3/EVP_PKEY_CTX_new.html">EVP_PKEY_CTX_new(3)</a>, <a href="../man3/EVP_PKEY_keygen.html">EVP_PKEY_keygen(3)</a>, <a href="../man3/EVP_PKEY_derive.html">EVP_PKEY_derive(3)</a>, <a href="../man3/EVP_PKEY_derive_set_peer.html">EVP_PKEY_derive_set_peer(3)</a></p>

<h1 id="COPYRIGHT">COPYRIGHT</h1>

<p>Licensed under the OpenSSL license (the &quot;License&quot;). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at <a href="https://www.openssl.org/source/license.html">https://www.openssl.org/source/license.html</a>.</p>

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