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+.\" ========================================================================
+.\"
+.IX Title "X25519 7"
+.TH X25519 7 "2019-09-10" "1.1.1d" "OpenSSL"
+.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
+.\" way too many mistakes in technical documents.
+.if n .ad l
+.nh
+.SH "NAME"
+X25519, X448 \&\- EVP_PKEY X25519 and X448 support
+.SH "DESCRIPTION"
+.IX Header "DESCRIPTION"
+The \fBX25519\fR and \fBX448\fR \s-1EVP_PKEY\s0 implementation supports key generation and
+key derivation using \fBX25519\fR and \fBX448\fR. It has associated private and public
+key formats compatible with draft\-ietf\-curdle\-pkix\-03.
+.PP
+No additional parameters can be set during key generation.
+.PP
+The peer public key must be set using \fBEVP_PKEY_derive_set_peer()\fR when
+performing key derivation.
+.SH "NOTES"
+.IX Header "NOTES"
+A context for the \fBX25519\fR algorithm can be obtained by calling:
+.PP
+.Vb 1
+\& EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_X25519, NULL);
+.Ve
+.PP
+For the \fBX448\fR algorithm a context can be obtained by calling:
+.PP
+.Vb 1
+\& EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_X448, NULL);
+.Ve
+.PP
+X25519 or X448 private keys can be set directly using
+\&\fBEVP_PKEY_new_raw_private_key\fR\|(3) or loaded from a PKCS#8 private key file
+using \fBPEM_read_bio_PrivateKey\fR\|(3) (or similar function). Completely new keys
+can also be generated (see the example below). Setting a private key also sets
+the associated public key.
+.PP
+X25519 or X448 public keys can be set directly using
+\&\fBEVP_PKEY_new_raw_public_key\fR\|(3) or loaded from a SubjectPublicKeyInfo
+structure in a \s-1PEM\s0 file using \fBPEM_read_bio_PUBKEY\fR\|(3) (or similar function).
+.SH "EXAMPLES"
+.IX Header "EXAMPLES"
+This example generates an \fBX25519\fR private key and writes it to standard
+output in \s-1PEM\s0 format:
+.PP
+.Vb 9
+\& #include <openssl/evp.h>
+\& #include <openssl/pem.h>
+\& ...
+\& EVP_PKEY *pkey = NULL;
+\& EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_X25519, 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);
+.Ve
+.PP
+The key derivation example in \fBEVP_PKEY_derive\fR\|(3) can be used with
+\&\fBX25519\fR and \fBX448\fR.
+.SH "SEE ALSO"
+.IX Header "SEE ALSO"
+\&\fBEVP_PKEY_CTX_new\fR\|(3),
+\&\fBEVP_PKEY_keygen\fR\|(3),
+\&\fBEVP_PKEY_derive\fR\|(3),
+\&\fBEVP_PKEY_derive_set_peer\fR\|(3)
+.SH "COPYRIGHT"
+.IX Header "COPYRIGHT"
+Copyright 2017\-2019 The OpenSSL Project Authors. All Rights Reserved.
+.PP
+Licensed under the OpenSSL license (the \*(L"License\*(R").  You may not use
+this file except in compliance with the License.  You can obtain a copy
+in the file \s-1LICENSE\s0 in the source distribution or at
+<https://www.openssl.org/source/license.html>.