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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>

<h1 id="NAME">NAME</h1>

<p>Ed25519, Ed448 - EVP_PKEY Ed25519 and Ed448 support</p>

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

<p>The <b>Ed25519</b> and <b>Ed448</b> EVP_PKEY implementation supports key generation, one-shot digest sign and digest verify using PureEdDSA and <b>Ed25519</b> or <b>Ed448</b> (see RFC8032). It has associated private and public key formats compatible with RFC 8410.</p>

<p>No additional parameters can be set during key generation, one-shot signing or verification. In particular, because PureEdDSA is used, a digest must <b>NOT</b> be specified when signing or verifying.</p>

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

<p>The PureEdDSA algorithm does not support the streaming mechanism of other signature algorithms using, for example, EVP_DigestUpdate(). The message to sign or verify must be passed using the one-shot EVP_DigestSign() and EVP_DigestVerify() functions.</p>

<p>When calling EVP_DigestSignInit() or EVP_DigestVerifyInit(), the digest <b>type</b> parameter <b>MUST</b> be set to <b>NULL</b>.</p>

<p>Applications wishing to sign certificates (or other structures such as CRLs or certificate requests) using Ed25519 or Ed448 can either use X509_sign() or X509_sign_ctx() in the usual way.</p>

<p>A context for the <b>Ed25519</b> algorithm can be obtained by calling:</p>

<pre><code> EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_ED25519, NULL);</code></pre>

<p>For the <b>Ed448</b> algorithm a context can be obtained by calling:</p>

<pre><code> EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_ED448, NULL);</code></pre>

<p>Ed25519 or Ed448 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>Ed25519 or Ed448 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>

<p>Ed25519 and Ed448 can be tested within <a href="../man1/speed.html">speed(1)</a> application since version 1.1.1. Valid algorithm names are <b>ed25519</b>, <b>ed448</b> and <b>eddsa</b>. If <b>eddsa</b> is specified, then both Ed25519 and Ed448 are benchmarked.</p>

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

<p>This example generates an <b>ED25519</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_ED25519, 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>

<h1 id="SEE-ALSO">SEE ALSO</h1>

<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_DigestSignInit.html">EVP_DigestSignInit(3)</a>, <a href="../man3/EVP_DigestVerifyInit.html">EVP_DigestVerifyInit(3)</a>,</p>

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

<p>Copyright 2017-2020 The OpenSSL Project Authors. All Rights Reserved.</p>

<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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Name Type Size Permission Actions
Ed25519.html File 4.36 KB 0644
Ed448.html File 4.36 KB 0644
RAND.html File 4.59 KB 0644
RAND_DRBG.html File 15.58 KB 0644
RSA-PSS.html File 3.28 KB 0644
SM2.html File 3.88 KB 0644
X25519.html File 3.56 KB 0644
X448.html File 3.56 KB 0644
bio.html File 4.39 KB 0644
crypto.html File 2.87 KB 0644
ct.html File 2.71 KB 0644
des_modes.html File 7.94 KB 0644
evp.html File 7.34 KB 0644
ossl_store-file.html File 3.23 KB 0644
ossl_store.html File 3.96 KB 0644
passphrase-encoding.html File 8.83 KB 0644
proxy-certificates.html File 14.21 KB 0644
scrypt.html File 5.39 KB 0644
ssl.html File 49.92 KB 0644
x509.html File 3.72 KB 0644