143 lines
4.0 KiB
HTML
143 lines
4.0 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<HTML><HEAD><TITLE>Man page of X25519</TITLE>
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</HEAD><BODY>
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<H1>X25519</H1>
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Section: OpenSSL (7SSL)<BR>Updated: 2021-03-22<BR><A HREF="#index">Index</A>
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<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
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<A NAME="lbAB"> </A>
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<H2>NAME</H2>
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X25519, X448 - EVP_PKEY X25519 and X448 support
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<A NAME="lbAC"> </A>
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<H2>DESCRIPTION</H2>
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The <B>X25519</B> and <B>X448</B> <FONT SIZE="-1">EVP_PKEY</FONT> implementation supports key generation and
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key derivation using <B>X25519</B> and <B>X448</B>. It has associated private and public
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key formats compatible with <FONT SIZE="-1">RFC 8410.</FONT>
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<P>
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No additional parameters can be set during key generation.
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<P>
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The peer public key must be set using <B>EVP_PKEY_derive_set_peer()</B> when
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performing key derivation.
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<A NAME="lbAD"> </A>
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<H2>NOTES</H2>
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A context for the <B>X25519</B> algorithm can be obtained by calling:
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<P>
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<PRE>
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EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_X25519, NULL);
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</PRE>
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<P>
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For the <B>X448</B> algorithm a context can be obtained by calling:
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<P>
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<PRE>
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EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_X448, NULL);
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</PRE>
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<P>
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X25519 or X448 private keys can be set directly using
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<B><A HREF="/cgi-bin/man/man2html?3+EVP_PKEY_new_raw_private_key">EVP_PKEY_new_raw_private_key</A></B>(3) or loaded from a PKCS#8 private key file
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using <B><A HREF="/cgi-bin/man/man2html?3+PEM_read_bio_PrivateKey">PEM_read_bio_PrivateKey</A></B>(3) (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.
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<P>
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X25519 or X448 public keys can be set directly using
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<B><A HREF="/cgi-bin/man/man2html?3+EVP_PKEY_new_raw_public_key">EVP_PKEY_new_raw_public_key</A></B>(3) or loaded from a SubjectPublicKeyInfo
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structure in a <FONT SIZE="-1">PEM</FONT> file using <B><A HREF="/cgi-bin/man/man2html?3+PEM_read_bio_PUBKEY">PEM_read_bio_PUBKEY</A></B>(3) (or similar function).
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<A NAME="lbAE"> </A>
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<H2>EXAMPLES</H2>
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This example generates an <B>X25519</B> private key and writes it to standard
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output in <FONT SIZE="-1">PEM</FONT> format:
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<P>
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<PRE>
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#include <<A HREF="file:///usr/include/openssl/evp.h">openssl/evp.h</A>>
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#include <<A HREF="file:///usr/include/openssl/pem.h">openssl/pem.h</A>>
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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);
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</PRE>
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<P>
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The key derivation example in <B><A HREF="/cgi-bin/man/man2html?3+EVP_PKEY_derive">EVP_PKEY_derive</A></B>(3) can be used with
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<B>X25519</B> and <B>X448</B>.
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<A NAME="lbAF"> </A>
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<H2>SEE ALSO</H2>
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<B><A HREF="/cgi-bin/man/man2html?3+EVP_PKEY_CTX_new">EVP_PKEY_CTX_new</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+EVP_PKEY_keygen">EVP_PKEY_keygen</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+EVP_PKEY_derive">EVP_PKEY_derive</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+EVP_PKEY_derive_set_peer">EVP_PKEY_derive_set_peer</A></B>(3)
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<A NAME="lbAG"> </A>
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<H2>COPYRIGHT</H2>
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Copyright 2017-2020 The OpenSSL Project Authors. All Rights Reserved.
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<P>
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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 <FONT SIZE="-1">LICENSE</FONT> 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>>.
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<P>
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<HR>
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<A NAME="index"> </A><H2>Index</H2>
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<DL>
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<DT id="1"><A HREF="#lbAB">NAME</A><DD>
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<DT id="2"><A HREF="#lbAC">DESCRIPTION</A><DD>
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<DT id="3"><A HREF="#lbAD">NOTES</A><DD>
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<DT id="4"><A HREF="#lbAE">EXAMPLES</A><DD>
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<DT id="5"><A HREF="#lbAF">SEE ALSO</A><DD>
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<DT id="6"><A HREF="#lbAG">COPYRIGHT</A><DD>
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</DL>
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<HR>
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This document was created by
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<A HREF="/cgi-bin/man/man2html">man2html</A>,
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using the manual pages.<BR>
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Time: 00:06:10 GMT, March 31, 2021
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</BODY>
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</HTML>
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