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Ed25519.html
<?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>Ed25519</title> <meta http-equiv="content-type" content="text/html; charset=utf-8" /> <link rev="made" href="mailto:root@localhost" /> </head> <body> <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 <openssl/evp.h> #include <openssl/pem.h> ... 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, &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 "License"). 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>
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