99d63d4662
Move manpages to manX directories Add Windows/VMS install fix from Richard Levitte Update README Fix typo's Remove some duplicates Reviewed-by: Richard Levitte <levitte@openssl.org>
85 lines
3 KiB
Text
85 lines
3 KiB
Text
=pod
|
|
|
|
=head1 NAME
|
|
|
|
DH_set_default_method, DH_get_default_method,
|
|
DH_set_method, DH_new_method, DH_OpenSSL - select DH method
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
#include <openssl/dh.h>
|
|
|
|
void DH_set_default_method(const DH_METHOD *meth);
|
|
|
|
const DH_METHOD *DH_get_default_method(void);
|
|
|
|
int DH_set_method(DH *dh, const DH_METHOD *meth);
|
|
|
|
DH *DH_new_method(ENGINE *engine);
|
|
|
|
const DH_METHOD *DH_OpenSSL(void);
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
A B<DH_METHOD> specifies the functions that OpenSSL uses for Diffie-Hellman
|
|
operations. By modifying the method, alternative implementations
|
|
such as hardware accelerators may be used. IMPORTANT: See the NOTES section for
|
|
important information about how these DH API functions are affected by the use
|
|
of B<ENGINE> API calls.
|
|
|
|
Initially, the default DH_METHOD is the OpenSSL internal implementation, as
|
|
returned by DH_OpenSSL().
|
|
|
|
DH_set_default_method() makes B<meth> the default method for all DH
|
|
structures created later. B<NB>: This is true only whilst no ENGINE has been set
|
|
as a default for DH, so this function is no longer recommended.
|
|
|
|
DH_get_default_method() returns a pointer to the current default DH_METHOD.
|
|
However, the meaningfulness of this result is dependent on whether the ENGINE
|
|
API is being used, so this function is no longer recommended.
|
|
|
|
DH_set_method() selects B<meth> to perform all operations using the key B<dh>.
|
|
This will replace the DH_METHOD used by the DH key and if the previous method
|
|
was supplied by an ENGINE, the handle to that ENGINE will be released during the
|
|
change. It is possible to have DH keys that only work with certain DH_METHOD
|
|
implementations (eg. from an ENGINE module that supports embedded
|
|
hardware-protected keys), and in such cases attempting to change the DH_METHOD
|
|
for the key can have unexpected results.
|
|
|
|
DH_new_method() allocates and initializes a DH structure so that B<engine> will
|
|
be used for the DH operations. If B<engine> is NULL, the default ENGINE for DH
|
|
operations is used, and if no default ENGINE is set, the DH_METHOD controlled by
|
|
DH_set_default_method() is used.
|
|
|
|
A new DH_METHOD object may be constructed using DH_meth_new() (see
|
|
L<DH_meth_new(3)>).
|
|
|
|
=head1 RETURN VALUES
|
|
|
|
DH_OpenSSL() and DH_get_default_method() return pointers to the respective
|
|
B<DH_METHOD>s.
|
|
|
|
DH_set_default_method() returns no value.
|
|
|
|
DH_set_method() returns non-zero if the provided B<meth> was successfully set as
|
|
the method for B<dh> (including unloading the ENGINE handle if the previous
|
|
method was supplied by an ENGINE).
|
|
|
|
DH_new_method() returns NULL and sets an error code that can be obtained by
|
|
L<ERR_get_error(3)> if the allocation fails. Otherwise it
|
|
returns a pointer to the newly allocated structure.
|
|
|
|
=head1 SEE ALSO
|
|
|
|
L<dh(3)>, L<DH_new(3)>, L<DH_meth_new(3)>
|
|
|
|
=head1 COPYRIGHT
|
|
|
|
Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
|
|
|
|
Licensed under the OpenSSL license (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
|