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Name	Size	Permission	Date
img	[ DIR ]	drwxr-xr-x	2025-02-06 06:22
EVP_ASYM_CIPHER-SM2.html	2.21 KB	-rw-r--r--	2025-02-06 06:22
EVP_CIPHER-AES.html	4.63 KB	-rw-r--r--	2025-02-06 06:22
EVP_CIPHER-ARIA.html	3.22 KB	-rw-r--r--	2025-02-06 06:22
EVP_CIPHER-BLOWFISH.html	2.04 KB	-rw-r--r--	2025-02-06 06:22
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EVP_CIPHER-DES.html	3.15 KB	-rw-r--r--	2025-02-06 06:22
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EVP_CIPHER-SEED.html	2.15 KB	-rw-r--r--	2025-02-06 06:22
EVP_CIPHER-SM4.html	2.17 KB	-rw-r--r--	2025-02-06 06:22
EVP_KDF-HKDF.html	7.44 KB	-rw-r--r--	2025-02-06 06:22
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EVP_KDF-PKCS12KDF.html	4.11 KB	-rw-r--r--	2025-02-06 06:22
EVP_KDF-SCRYPT.html	7.08 KB	-rw-r--r--	2025-02-06 06:22
EVP_KDF-SS.html	8.43 KB	-rw-r--r--	2025-02-06 06:22
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EVP_KDF-TLS13_KDF.html	6.5 KB	-rw-r--r--	2025-02-06 06:22
EVP_KDF-TLS1_PRF.html	4.9 KB	-rw-r--r--	2025-02-06 06:22
EVP_KDF-X942-ASN1.html	7.41 KB	-rw-r--r--	2025-02-06 06:22
EVP_KDF-X942-CONCAT.html	1.78 KB	-rw-r--r--	2025-02-06 06:22
EVP_KDF-X963.html	4.86 KB	-rw-r--r--	2025-02-06 06:22
EVP_KEM-RSA.html	2.85 KB	-rw-r--r--	2025-02-06 06:22
EVP_KEYEXCH-DH.html	6.42 KB	-rw-r--r--	2025-02-06 06:22
EVP_KEYEXCH-ECDH.html	6.21 KB	-rw-r--r--	2025-02-06 06:22
EVP_KEYEXCH-X25519.html	2.5 KB	-rw-r--r--	2025-02-06 06:22
EVP_MAC-BLAKE2.html	4.25 KB	-rw-r--r--	2025-02-06 06:22
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EVP_MAC-HMAC.html	4.54 KB	-rw-r--r--	2025-02-06 06:22
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EVP_MD-RIPEMD160.html	2.1 KB	-rw-r--r--	2025-02-06 06:22
EVP_MD-SHA1.html	3.03 KB	-rw-r--r--	2025-02-06 06:22
EVP_MD-SHA2.html	2.85 KB	-rw-r--r--	2025-02-06 06:22
EVP_MD-SHA3.html	2.16 KB	-rw-r--r--	2025-02-06 06:22
EVP_MD-SHAKE.html	3.98 KB	-rw-r--r--	2025-02-06 06:22
EVP_MD-SM3.html	1.84 KB	-rw-r--r--	2025-02-06 06:22
EVP_MD-WHIRLPOOL.html	1.86 KB	-rw-r--r--	2025-02-06 06:22
EVP_MD-common.html	2.88 KB	-rw-r--r--	2025-02-06 06:22
EVP_PKEY-DH.html	15.63 KB	-rw-r--r--	2025-02-06 06:22
EVP_PKEY-DSA.html	6.09 KB	-rw-r--r--	2025-02-06 06:22
EVP_PKEY-EC.html	14.04 KB	-rw-r--r--	2025-02-06 06:22
EVP_PKEY-FFC.html	11.47 KB	-rw-r--r--	2025-02-06 06:22
EVP_PKEY-HMAC.html	4.69 KB	-rw-r--r--	2025-02-06 06:22
EVP_PKEY-RSA.html	15.32 KB	-rw-r--r--	2025-02-06 06:22
EVP_PKEY-SM2.html	4.65 KB	-rw-r--r--	2025-02-06 06:22
EVP_PKEY-X25519.html	5.03 KB	-rw-r--r--	2025-02-06 06:22
EVP_RAND-CTR-DRBG.html	5.56 KB	-rw-r--r--	2025-02-06 06:22
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EVP_RAND-HMAC-DRBG.html	5.39 KB	-rw-r--r--	2025-02-06 06:22
EVP_RAND-SEED-SRC.html	3.69 KB	-rw-r--r--	2025-02-06 06:22
EVP_RAND-TEST-RAND.html	6 KB	-rw-r--r--	2025-02-06 06:22
EVP_RAND.html	15.67 KB	-rw-r--r--	2025-02-06 06:22
EVP_SIGNATURE-DSA.html	2.92 KB	-rw-r--r--	2025-02-06 06:22
EVP_SIGNATURE-ECDSA.html	2.93 KB	-rw-r--r--	2025-02-06 06:22
EVP_SIGNATURE-ED25519.html	5.02 KB	-rw-r--r--	2025-02-06 06:22
EVP_SIGNATURE-HMAC.html	2.96 KB	-rw-r--r--	2025-02-06 06:22
EVP_SIGNATURE-RSA.html	5.58 KB	-rw-r--r--	2025-02-06 06:22
OSSL_PROVIDER-FIPS.html	19.9 KB	-rw-r--r--	2025-02-06 06:22
OSSL_PROVIDER-base.html	4.06 KB	-rw-r--r--	2025-02-06 06:22
OSSL_PROVIDER-default.html	13.14 KB	-rw-r--r--	2025-02-06 06:22
OSSL_PROVIDER-legacy.html	5.08 KB	-rw-r--r--	2025-02-06 06:22
OSSL_PROVIDER-null.html	1.75 KB	-rw-r--r--	2025-02-06 06:22
RAND.html	4.49 KB	-rw-r--r--	2025-02-06 06:22
RSA-PSS.html	3.29 KB	-rw-r--r--	2025-02-06 06:22
X25519.html	3.57 KB	-rw-r--r--	2025-02-06 06:22
bio.html	4.47 KB	-rw-r--r--	2025-02-06 06:22
crypto.html	27.34 KB	-rw-r--r--	2025-02-06 06:22
ct.html	2.71 KB	-rw-r--r--	2025-02-06 06:22
des_modes.html	7.94 KB	-rw-r--r--	2025-02-06 06:22
evp.html	7.56 KB	-rw-r--r--	2025-02-06 06:22
fips_module.html	22.56 KB	-rw-r--r--	2025-02-06 06:22
life_cycle-cipher.html	15.05 KB	-rw-r--r--	2025-02-06 06:22
life_cycle-digest.html	7.91 KB	-rw-r--r--	2025-02-06 06:22
life_cycle-kdf.html	5.43 KB	-rw-r--r--	2025-02-06 06:22
life_cycle-mac.html	7.63 KB	-rw-r--r--	2025-02-06 06:22
life_cycle-pkey.html	31.16 KB	-rw-r--r--	2025-02-06 06:22
life_cycle-rand.html	6.68 KB	-rw-r--r--	2025-02-06 06:22
migration_guide.html	123.13 KB	-rw-r--r--	2025-02-06 06:22
openssl-core.h.html	5.78 KB	-rw-r--r--	2025-02-06 06:22
openssl-core_dispatch.h.html	2.34 KB	-rw-r--r--	2025-02-06 06:22
openssl-core_names.h.html	2.58 KB	-rw-r--r--	2025-02-06 06:22
openssl-env.html	4.87 KB	-rw-r--r--	2025-02-06 06:22
openssl-glossary.html	9.71 KB	-rw-r--r--	2025-02-06 06:22
openssl-threads.html	5.79 KB	-rw-r--r--	2025-02-06 06:22
openssl_user_macros.html	3.89 KB	-rw-r--r--	2025-02-06 06:22
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ossl_store.html	3.96 KB	-rw-r--r--	2025-02-06 06:22
passphrase-encoding.html	8.83 KB	-rw-r--r--	2025-02-06 06:22
property.html	7.97 KB	-rw-r--r--	2025-02-06 06:22
provider-asym_cipher.html	14.77 KB	-rw-r--r--	2025-02-06 06:22
provider-base.html	37.71 KB	-rw-r--r--	2025-02-06 06:22
provider-cipher.html	14.16 KB	-rw-r--r--	2025-02-06 06:22
provider-decoder.html	13.65 KB	-rw-r--r--	2025-02-06 06:22
provider-digest.html	14.65 KB	-rw-r--r--	2025-02-06 06:22
provider-encoder.html	14.68 KB	-rw-r--r--	2025-02-06 06:22
provider-kdf.html	16.91 KB	-rw-r--r--	2025-02-06 06:22
provider-kem.html	11.05 KB	-rw-r--r--	2025-02-06 06:22
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provider-keymgmt.html	20.84 KB	-rw-r--r--	2025-02-06 06:22
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Rename

<?xml version="1.0" ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>EVP_PKEY-X25519</title>
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
<link rev="made" href="mailto:root@localhost" />
</head>

<ul id="index">
  <li><a href="#NAME">NAME</a></li>
  <li><a href="#DESCRIPTION">DESCRIPTION</a>
    <ul>
      <li><a href="#Common-X25519-X448-ED25519-and-ED448-parameters">Common X25519, X448, ED25519 and ED448 parameters</a></li>
      <li><a href="#ED25519-and-ED448-parameters">ED25519 and ED448 parameters</a></li>
    </ul>
  </li>
  <li><a href="#CONFORMING-TO">CONFORMING TO</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>EVP_PKEY-X25519, EVP_PKEY-X448, EVP_PKEY-ED25519, EVP_PKEY-ED448, EVP_KEYMGMT-X25519, EVP_KEYMGMT-X448, EVP_KEYMGMT-ED25519, EVP_KEYMGMT-ED448 - EVP_PKEY X25519, X448, ED25519 and ED448 keytype and algorithm support</p>

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

<p>The <b>X25519</b>, <b>X448</b>, <b>ED25519</b> and <b>ED448</b> keytypes are implemented in OpenSSL&#39;s default and FIPS providers. These implementations support the associated key, containing the public key <i>pub</i> and the private key <i>priv</i>.</p>

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

<h2 id="Common-X25519-X448-ED25519-and-ED448-parameters">Common X25519, X448, ED25519 and ED448 parameters</h2>

<p>In addition to the common parameters that all keytypes should support (see <a href="../man7/provider-keymgmt.html">&quot;Common parameters&quot; in provider-keymgmt(7)</a>), the implementation of these keytypes support the following.</p>

<dl>

<dt id="group-OSSL_PKEY_PARAM_GROUP_NAME-UTF8-string">&quot;group&quot; (<b>OSSL_PKEY_PARAM_GROUP_NAME</b>) &lt;UTF8 string&gt;</dt>
<dd>

<p>This is only supported by X25519 and X448. The group name must be &quot;x25519&quot; or &quot;x448&quot; respectively for those algorithms. This is only present for consistency with other key exchange algorithms and is typically not needed.</p>

</dd>
<dt id="pub-OSSL_PKEY_PARAM_PUB_KEY-octet-string">&quot;pub&quot; (<b>OSSL_PKEY_PARAM_PUB_KEY</b>) &lt;octet string&gt;</dt>
<dd>

<p>The public key value.</p>

</dd>
<dt id="priv-OSSL_PKEY_PARAM_PRIV_KEY-octet-string">&quot;priv&quot; (<b>OSSL_PKEY_PARAM_PRIV_KEY</b>) &lt;octet string&gt;</dt>
<dd>

<p>The private key value.</p>

</dd>
<dt id="encoded-pub-key-OSSL_PKEY_PARAM_ENCODED_PUBLIC_KEY-octet-string">&quot;encoded-pub-key&quot; (<b>OSSL_PKEY_PARAM_ENCODED_PUBLIC_KEY</b>) &lt;octet string&gt;</dt>
<dd>

<p>Used for getting and setting the encoding of a public key for the <b>X25519</b> and <b>X448</b> key types. Public keys are expected be encoded in a format as defined by RFC7748.</p>

</dd>
</dl>

<h2 id="ED25519-and-ED448-parameters">ED25519 and ED448 parameters</h2>

<dl>

<dt id="mandatory-digest-OSSL_PKEY_PARAM_MANDATORY_DIGEST-UTF8-string">&quot;mandatory-digest&quot; (<b>OSSL_PKEY_PARAM_MANDATORY_DIGEST</b>) &lt;UTF8 string&gt;</dt>
<dd>

<p>The empty string, signifying that no digest may be specified.</p>

</dd>
</dl>

<h1 id="CONFORMING-TO">CONFORMING TO</h1>

<dl>

</dd>
<dt id="RFC-8410">RFC 8410</dt>
<dd>

</dd>
</dl>

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

<p>An <b>EVP_PKEY</b> context can be obtained by calling:</p>

<pre><code>    EVP_PKEY_CTX *pctx =
        EVP_PKEY_CTX_new_from_name(NULL, &quot;X25519&quot;, NULL);

EVP_PKEY_CTX *pctx =
        EVP_PKEY_CTX_new_from_name(NULL, &quot;X448&quot;, NULL);

EVP_PKEY_CTX *pctx =
        EVP_PKEY_CTX_new_from_name(NULL, &quot;ED25519&quot;, NULL);

EVP_PKEY_CTX *pctx =
        EVP_PKEY_CTX_new_from_name(NULL, &quot;ED448&quot;, NULL);</code></pre>

<p>An <b>X25519</b> key can be generated like this:</p>

<pre><code>    pkey = EVP_PKEY_Q_keygen(NULL, NULL, &quot;X25519&quot;);</code></pre>

<p>An <b>X448</b>, <b>ED25519</b>, or <b>ED448</b> key can be generated likewise.</p>

<p><a href="../man3/EVP_KEYMGMT.html">EVP_KEYMGMT(3)</a>, <a href="../man3/EVP_PKEY.html">EVP_PKEY(3)</a>, <a href="../man7/provider-keymgmt.html">provider-keymgmt(7)</a>, <a href="../man7/EVP_KEYEXCH-X25519.html">EVP_KEYEXCH-X25519(7)</a>, <a href="../man7/EVP_KEYEXCH-X448.html">EVP_KEYEXCH-X448(7)</a>, <a href="../man7/EVP_SIGNATURE-ED25519.html">EVP_SIGNATURE-ED25519(7)</a>, <a href="../man7/EVP_SIGNATURE-ED448.html">EVP_SIGNATURE-ED448(7)</a></p>

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

<p>Licensed under the Apache License 2.0 (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>

</body>

</html>