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X25519.7
.\" Automatically generated by Pod::Man 4.11 (Pod::Simple 3.35) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" Set up some character translations and predefined strings. \*(-- will .\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left .\" double quote, and \*(R" will give a right double quote. \*(C+ will .\" give a nicer C++. Capital omega is used to do unbreakable dashes and .\" therefore won't be available. \*(C` and \*(C' expand to `' in nroff, .\" nothing in troff, for use with C<>. .tr \(*W- .ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p' .ie n \{\ . ds -- \(*W- . ds PI pi . if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch . if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch . ds L" "" . ds R" "" . ds C` "" . ds C' "" 'br\} .el\{\ . ds -- \|\(em\| . ds PI \(*p . ds L" `` . ds R" '' . ds C` . ds C' 'br\} .\" .\" Escape single quotes in literal strings from groff's Unicode transform. .ie \n(.g .ds Aq \(aq .el .ds Aq ' .\" .\" If the F register is >0, we'll generate index entries on stderr for .\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index .\" entries marked with X<> in POD. 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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 \s-1RFC 8410.\s0 .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\-2020 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>.
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