mirror of https://github.com/openssl/openssl.git
112 lines
4.4 KiB
Plaintext
112 lines
4.4 KiB
Plaintext
=pod
|
|
|
|
=head1 NAME
|
|
|
|
EVP_KEYEXCH_fetch, EVP_KEYEXCH_free, EVP_KEYEXCH_up_ref,
|
|
EVP_KEYEXCH_get0_provider, EVP_KEYEXCH_is_a, EVP_KEYEXCH_do_all_provided,
|
|
EVP_KEYEXCH_names_do_all, EVP_KEYEXCH_get0_name, EVP_KEYEXCH_get0_description,
|
|
EVP_KEYEXCH_gettable_ctx_params, EVP_KEYEXCH_settable_ctx_params
|
|
- Functions to manage EVP_KEYEXCH algorithm objects
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
#include <openssl/evp.h>
|
|
|
|
EVP_KEYEXCH *EVP_KEYEXCH_fetch(OSSL_LIB_CTX *ctx, const char *algorithm,
|
|
const char *properties);
|
|
void EVP_KEYEXCH_free(EVP_KEYEXCH *exchange);
|
|
int EVP_KEYEXCH_up_ref(EVP_KEYEXCH *exchange);
|
|
OSSL_PROVIDER *EVP_KEYEXCH_get0_provider(const EVP_KEYEXCH *exchange);
|
|
int EVP_KEYEXCH_is_a(const EVP_KEYEXCH *exchange, const char *name);
|
|
const char *EVP_KEYEXCH_get0_name(const EVP_KEYEXCH *exchange);
|
|
void EVP_KEYEXCH_do_all_provided(OSSL_LIB_CTX *libctx,
|
|
void (*fn)(EVP_KEYEXCH *exchange, void *arg),
|
|
void *arg);
|
|
int EVP_KEYEXCH_names_do_all(const EVP_KEYEXCH *exchange,
|
|
void (*fn)(const char *name, void *data),
|
|
void *data);
|
|
const char *EVP_KEYEXCH_get0_description(const EVP_KEYEXCH *keyexch);
|
|
const OSSL_PARAM *EVP_KEYEXCH_gettable_ctx_params(const EVP_KEYEXCH *keyexch);
|
|
const OSSL_PARAM *EVP_KEYEXCH_settable_ctx_params(const EVP_KEYEXCH *keyexch);
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
EVP_KEYEXCH_fetch() fetches the key exchange implementation for the given
|
|
I<algorithm> from any provider offering it, within the criteria given
|
|
by the I<properties>.
|
|
See L<crypto(7)/ALGORITHM FETCHING> for further information.
|
|
|
|
The returned value must eventually be freed with EVP_KEYEXCH_free().
|
|
|
|
EVP_KEYEXCH_free() decrements the reference count for the B<EVP_KEYEXCH>
|
|
structure. Typically this structure will have been obtained from an earlier call
|
|
to EVP_KEYEXCH_fetch(). If the reference count drops to 0 then the
|
|
structure is freed.
|
|
|
|
EVP_KEYEXCH_up_ref() increments the reference count for an B<EVP_KEYEXCH>
|
|
structure.
|
|
|
|
EVP_KEYEXCH_get0_provider() returns the provider that I<exchange> was
|
|
fetched from.
|
|
|
|
EVP_KEYEXCH_is_a() checks if I<exchange> is an implementation of an
|
|
algorithm that's identifiable with I<name>.
|
|
|
|
EVP_KEYEXCH_get0_name() returns the algorithm name from the provided
|
|
implementation for the given I<exchange>. Note that the I<exchange> may have
|
|
multiple synonyms associated with it. In this case the first name from the
|
|
algorithm definition is returned. Ownership of the returned string is retained
|
|
by the I<exchange> object and should not be freed by the caller.
|
|
|
|
EVP_KEYEXCH_names_do_all() traverses all names for the I<exchange>, and
|
|
calls I<fn> with each name and I<data>.
|
|
|
|
EVP_KEYEXCH_get0_description() returns a description of the I<keyexch>, meant
|
|
for display and human consumption. The description is at the discretion of
|
|
the I<keyexch> implementation.
|
|
|
|
EVP_KEYEXCH_do_all_provided() traverses all key exchange implementations by
|
|
all activated providers in the library context I<libctx>, and for each
|
|
of the implementations, calls I<fn> with the implementation method and
|
|
I<data> as arguments.
|
|
|
|
EVP_KEYEXCH_gettable_ctx_params() and EVP_KEYEXCH_settable_ctx_params() return
|
|
a constant L<OSSL_PARAM(3)> array that describes the names and types of key
|
|
parameters that can be retrieved or set by a key exchange algorithm using
|
|
L<EVP_PKEY_CTX_get_params(3)> and L<EVP_PKEY_CTX_set_params(3)>.
|
|
|
|
=head1 RETURN VALUES
|
|
|
|
EVP_KEYEXCH_fetch() returns a pointer to a B<EVP_KEYEXCH> for success
|
|
or NULL for failure.
|
|
|
|
EVP_KEYEXCH_up_ref() returns 1 for success or 0 otherwise.
|
|
|
|
EVP_KEYEXCH_names_do_all() returns 1 if the callback was called for all
|
|
names. A return value of 0 means that the callback was not called for any names.
|
|
|
|
EVP_KEYEXCH_is_a() returns 1 of I<exchange> was identifiable,
|
|
otherwise 0.
|
|
|
|
EVP_KEYEXCH_gettable_ctx_params() and EVP_KEYEXCH_settable_ctx_params() return
|
|
a constant L<OSSL_PARAM(3)> array or NULL on error.
|
|
|
|
=head1 SEE ALSO
|
|
|
|
L<crypto(7)/ALGORITHM FETCHING>, L<OSSL_PROVIDER(3)>
|
|
|
|
=head1 HISTORY
|
|
|
|
The functions described here were added in OpenSSL 3.0.
|
|
|
|
=head1 COPYRIGHT
|
|
|
|
Copyright 2019-2021 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
|