105 lines
3.5 KiB
HTML
Executable File
105 lines
3.5 KiB
HTML
Executable File
<?xml version="1.0" ?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<title>X25519</title>
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<meta http-equiv="content-type" content="text/html; charset=utf-8" />
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<link rev="made" href="mailto:root@localhost" />
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</head>
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<body style="background-color: white">
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<!-- INDEX BEGIN -->
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<div name="index">
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<p><a name="__index__"></a></p>
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<ul>
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<li><a href="#name">NAME</a></li>
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<li><a href="#description">DESCRIPTION</a></li>
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<li><a href="#notes">NOTES</a></li>
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<li><a href="#examples">EXAMPLES</a></li>
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<li><a href="#see_also">SEE ALSO</a></li>
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<li><a href="#copyright">COPYRIGHT</a></li>
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</ul>
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<hr name="index" />
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</div>
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<!-- INDEX END -->
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<p>
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</p>
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<hr />
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<h1><a name="name">NAME</a></h1>
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<p>X25519,
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X448
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- EVP_PKEY X25519 and X448 support</p>
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<p>
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</p>
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<hr />
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<h1><a name="description">DESCRIPTION</a></h1>
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<p>The <strong>X25519</strong> and <strong>X448</strong> EVP_PKEY implementation supports key generation and
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key derivation using <strong>X25519</strong> and <strong>X448</strong>. It has associated private and public
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key formats compatible with draft-ietf-curdle-pkix-03.</p>
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<p>No additional parameters can be set during key generation.</p>
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<p>The peer public key must be set using <code>EVP_PKEY_derive_set_peer()</code> when
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performing key derivation.</p>
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<p>
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</p>
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<hr />
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<h1><a name="notes">NOTES</a></h1>
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<p>A context for the <strong>X25519</strong> algorithm can be obtained by calling:</p>
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<pre>
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EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_X25519, NULL);</pre>
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<p>For the <strong>X448</strong> algorithm a context can be obtained by calling:</p>
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<pre>
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EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_X448, NULL);</pre>
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<p>X25519 or X448 private keys can be set directly using
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<em>EVP_PKEY_new_raw_private_key(3)</em> or loaded from a PKCS#8 private key file
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using <em>PEM_read_bio_PrivateKey(3)</em> (or similar function). Completely new keys
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can also be generated (see the example below). Setting a private key also sets
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the associated public key.</p>
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<p>X25519 or X448 public keys can be set directly using
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<em>EVP_PKEY_new_raw_public_key(3)</em> or loaded from a SubjectPublicKeyInfo
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structure in a PEM file using <em>PEM_read_bio_PUBKEY(3)</em> (or similar function).</p>
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<p>
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</p>
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<hr />
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<h1><a name="examples">EXAMPLES</a></h1>
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<p>This example generates an <strong>X25519</strong> private key and writes it to standard
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output in PEM format:</p>
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<pre>
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#include <openssl/evp.h>
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#include <openssl/pem.h>
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...
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EVP_PKEY *pkey = NULL;
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EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_X25519, NULL);
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EVP_PKEY_keygen_init(pctx);
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EVP_PKEY_keygen(pctx, &pkey);
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EVP_PKEY_CTX_free(pctx);
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PEM_write_PrivateKey(stdout, pkey, NULL, NULL, 0, NULL, NULL);</pre>
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<p>The key derivation example in <em>EVP_PKEY_derive(3)</em> can be used with
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<strong>X25519</strong> and <strong>X448</strong>.</p>
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<p>
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</p>
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<hr />
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<h1><a name="see_also">SEE ALSO</a></h1>
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<p><em>EVP_PKEY_CTX_new(3)</em>,
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<em>EVP_PKEY_keygen(3)</em>,
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<em>EVP_PKEY_derive(3)</em>,
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<em>EVP_PKEY_derive_set_peer(3)</em></p>
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<p>
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</p>
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<hr />
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<h1><a name="copyright">COPYRIGHT</a></h1>
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<p>Copyright 2017-2019 The OpenSSL Project Authors. All Rights Reserved.</p>
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<p>Licensed under the OpenSSL license (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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<a href="https://www.openssl.org/source/license.html">https://www.openssl.org/source/license.html</a>.</p>
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</body>
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</html>
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