mirror of
https://github.com/openssl/openssl.git
synced 2024-12-03 05:41:46 +08:00
33388b44b6
Reviewed-by: Richard Levitte <levitte@openssl.org> (Merged from https://github.com/openssl/openssl/pull/11616)
68 lines
1.9 KiB
Plaintext
68 lines
1.9 KiB
Plaintext
=pod
|
|
|
|
=head1 NAME
|
|
|
|
DH_generate_key, DH_compute_key - perform Diffie-Hellman key exchange
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
#include <openssl/dh.h>
|
|
|
|
Deprecated since OpenSSL 3.0, can be hidden entirely by defining
|
|
B<OPENSSL_API_COMPAT> with a suitable version value, see
|
|
L<openssl_user_macros(7)>:
|
|
|
|
int DH_generate_key(DH *dh);
|
|
|
|
int DH_compute_key(unsigned char *key, BIGNUM *pub_key, DH *dh);
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
Both of the functions described on this page are deprecated.
|
|
Applications should instead use L<EVP_PKEY_derive_init(3)>
|
|
and L<EVP_PKEY_derive(3)>.
|
|
|
|
DH_generate_key() performs the first step of a Diffie-Hellman key
|
|
exchange by generating private and public DH values. By calling
|
|
DH_compute_key(), these are combined with the other party's public
|
|
value to compute the shared key.
|
|
|
|
DH_generate_key() expects B<dh> to contain the shared parameters
|
|
B<dh-E<gt>p> and B<dh-E<gt>g>. It generates a random private DH value
|
|
unless B<dh-E<gt>priv_key> is already set, and computes the
|
|
corresponding public value B<dh-E<gt>pub_key>, which can then be
|
|
published.
|
|
|
|
DH_compute_key() computes the shared secret from the private DH value
|
|
in B<dh> and the other party's public value in B<pub_key> and stores
|
|
it in B<key>. B<key> must point to B<DH_size(dh)> bytes of memory.
|
|
|
|
=head1 RETURN VALUES
|
|
|
|
DH_generate_key() returns 1 on success, 0 otherwise.
|
|
|
|
DH_compute_key() returns the size of the shared secret on success, -1
|
|
on error.
|
|
|
|
The error codes can be obtained by L<ERR_get_error(3)>.
|
|
|
|
=head1 SEE ALSO
|
|
|
|
L<EVP_PKEY_derive(3)>,
|
|
L<DH_new(3)>, L<ERR_get_error(3)>, L<RAND_bytes(3)>, L<DH_size(3)>
|
|
|
|
=head1 HISTORY
|
|
|
|
Both of these functions were deprecated in OpenSSL 3.0.
|
|
|
|
=head1 COPYRIGHT
|
|
|
|
Copyright 2000-2020 The OpenSSL Project Authors. All Rights Reserved.
|
|
|
|
Licensed under the Apache License 2.0 (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
|
|
L<https://www.openssl.org/source/license.html>.
|
|
|
|
=cut
|