mirror of https://github.com/openssl/openssl
112 lines
4.4 KiB
Plaintext
112 lines
4.4 KiB
Plaintext
=pod
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=head1 NAME
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EVP_KEYEXCH_fetch, EVP_KEYEXCH_free, EVP_KEYEXCH_up_ref,
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EVP_KEYEXCH_get0_provider, EVP_KEYEXCH_is_a, EVP_KEYEXCH_do_all_provided,
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EVP_KEYEXCH_names_do_all, EVP_KEYEXCH_get0_name, EVP_KEYEXCH_get0_description,
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EVP_KEYEXCH_gettable_ctx_params, EVP_KEYEXCH_settable_ctx_params
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- Functions to manage EVP_KEYEXCH algorithm objects
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=head1 SYNOPSIS
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#include <openssl/evp.h>
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EVP_KEYEXCH *EVP_KEYEXCH_fetch(OSSL_LIB_CTX *ctx, const char *algorithm,
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const char *properties);
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void EVP_KEYEXCH_free(EVP_KEYEXCH *exchange);
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int EVP_KEYEXCH_up_ref(EVP_KEYEXCH *exchange);
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OSSL_PROVIDER *EVP_KEYEXCH_get0_provider(const EVP_KEYEXCH *exchange);
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int EVP_KEYEXCH_is_a(const EVP_KEYEXCH *exchange, const char *name);
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const char *EVP_KEYEXCH_get0_name(const EVP_KEYEXCH *exchange);
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void EVP_KEYEXCH_do_all_provided(OSSL_LIB_CTX *libctx,
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void (*fn)(EVP_KEYEXCH *exchange, void *arg),
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void *arg);
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int EVP_KEYEXCH_names_do_all(const EVP_KEYEXCH *exchange,
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void (*fn)(const char *name, void *data),
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void *data);
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const char *EVP_KEYEXCH_get0_description(const EVP_KEYEXCH *keyexch);
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const OSSL_PARAM *EVP_KEYEXCH_gettable_ctx_params(const EVP_KEYEXCH *keyexch);
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const OSSL_PARAM *EVP_KEYEXCH_settable_ctx_params(const EVP_KEYEXCH *keyexch);
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=head1 DESCRIPTION
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EVP_KEYEXCH_fetch() fetches the key exchange implementation for the given
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I<algorithm> from any provider offering it, within the criteria given
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by the I<properties>.
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See L<crypto(7)/ALGORITHM FETCHING> for further information.
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The returned value must eventually be freed with EVP_KEYEXCH_free().
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EVP_KEYEXCH_free() decrements the reference count for the B<EVP_KEYEXCH>
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structure. Typically this structure will have been obtained from an earlier call
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to EVP_KEYEXCH_fetch(). If the reference count drops to 0 then the
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structure is freed.
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EVP_KEYEXCH_up_ref() increments the reference count for an B<EVP_KEYEXCH>
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structure.
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EVP_KEYEXCH_get0_provider() returns the provider that I<exchange> was
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fetched from.
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EVP_KEYEXCH_is_a() checks if I<exchange> is an implementation of an
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algorithm that's identifiable with I<name>.
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EVP_KEYEXCH_get0_name() returns the algorithm name from the provided
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implementation for the given I<exchange>. Note that the I<exchange> may have
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multiple synonyms associated with it. In this case the first name from the
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algorithm definition is returned. Ownership of the returned string is retained
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by the I<exchange> object and should not be freed by the caller.
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EVP_KEYEXCH_names_do_all() traverses all names for the I<exchange>, and
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calls I<fn> with each name and I<data>.
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EVP_KEYEXCH_get0_description() returns a description of the I<keyexch>, meant
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for display and human consumption. The description is at the discretion of
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the I<keyexch> implementation.
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EVP_KEYEXCH_do_all_provided() traverses all key exchange implementations by
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all activated providers in the library context I<libctx>, and for each
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of the implementations, calls I<fn> with the implementation method and
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I<data> as arguments.
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EVP_KEYEXCH_gettable_ctx_params() and EVP_KEYEXCH_settable_ctx_params() return
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a constant L<OSSL_PARAM(3)> array that describes the names and types of key
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parameters that can be retrieved or set by a key exchange algorithm using
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L<EVP_PKEY_CTX_get_params(3)> and L<EVP_PKEY_CTX_set_params(3)>.
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=head1 RETURN VALUES
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EVP_KEYEXCH_fetch() returns a pointer to a B<EVP_KEYEXCH> for success
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or NULL for failure.
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EVP_KEYEXCH_up_ref() returns 1 for success or 0 otherwise.
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EVP_KEYEXCH_names_do_all() returns 1 if the callback was called for all
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names. A return value of 0 means that the callback was not called for any names.
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EVP_KEYEXCH_is_a() returns 1 of I<exchange> was identifiable,
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otherwise 0.
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EVP_KEYEXCH_gettable_ctx_params() and EVP_KEYEXCH_settable_ctx_params() return
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a constant L<OSSL_PARAM(3)> array or NULL on error.
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=head1 SEE ALSO
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L<crypto(7)/ALGORITHM FETCHING>, L<OSSL_PROVIDER(3)>
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=head1 HISTORY
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The functions described here were added in OpenSSL 3.0.
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=head1 COPYRIGHT
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Copyright 2019-2021 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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