mirror of
https://github.com/openssl/openssl.git
synced 2024-12-09 05:51:54 +08:00
b97fdb57a2
Reviewed-by: Rich Salz <rsalz@openssl.org> (Merged from https://github.com/openssl/openssl/pull/1900)
86 lines
3.0 KiB
Plaintext
86 lines
3.0 KiB
Plaintext
=pod
|
|
|
|
=head1 NAME
|
|
|
|
DSA_set_default_method, DSA_get_default_method,
|
|
DSA_set_method, DSA_new_method, DSA_OpenSSL - select DSA method
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
#include <openssl/dsa.h>
|
|
|
|
void DSA_set_default_method(const DSA_METHOD *meth);
|
|
|
|
const DSA_METHOD *DSA_get_default_method(void);
|
|
|
|
int DSA_set_method(DSA *dsa, const DSA_METHOD *meth);
|
|
|
|
DSA *DSA_new_method(ENGINE *engine);
|
|
|
|
DSA_METHOD *DSA_OpenSSL(void);
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
A B<DSA_METHOD> specifies the functions that OpenSSL uses for DSA
|
|
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 DSA API functions are affected by the use
|
|
of B<ENGINE> API calls.
|
|
|
|
Initially, the default DSA_METHOD is the OpenSSL internal implementation,
|
|
as returned by DSA_OpenSSL().
|
|
|
|
DSA_set_default_method() makes B<meth> the default method for all DSA
|
|
structures created later. B<NB>: This is true only whilst no ENGINE has
|
|
been set as a default for DSA, so this function is no longer recommended.
|
|
|
|
DSA_get_default_method() returns a pointer to the current default
|
|
DSA_METHOD. However, the meaningfulness of this result is dependent on
|
|
whether the ENGINE API is being used, so this function is no longer
|
|
recommended.
|
|
|
|
DSA_set_method() selects B<meth> to perform all operations using the key
|
|
B<rsa>. This will replace the DSA_METHOD used by the DSA 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 DSA keys that only
|
|
work with certain DSA_METHOD implementations (eg. from an ENGINE module
|
|
that supports embedded hardware-protected keys), and in such cases
|
|
attempting to change the DSA_METHOD for the key can have unexpected
|
|
results. See L<DSA_meth_new> for information on constructing custom DSA_METHOD
|
|
objects;
|
|
|
|
DSA_new_method() allocates and initializes a DSA structure so that B<engine>
|
|
will be used for the DSA operations. If B<engine> is NULL, the default engine
|
|
for DSA operations is used, and if no default ENGINE is set, the DSA_METHOD
|
|
controlled by DSA_set_default_method() is used.
|
|
|
|
=head1 RETURN VALUES
|
|
|
|
DSA_OpenSSL() and DSA_get_default_method() return pointers to the respective
|
|
B<DSA_METHOD>s.
|
|
|
|
DSA_set_default_method() returns no value.
|
|
|
|
DSA_set_method() returns non-zero if the provided B<meth> was successfully set as
|
|
the method for B<dsa> (including unloading the ENGINE handle if the previous
|
|
method was supplied by an ENGINE).
|
|
|
|
DSA_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<DSA_new(3)>, L<DSA_new(3)>, L<DSA_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
|