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=pod

=head1 NAME

OSSL_STORE_expect,
OSSL_STORE_supports_search,
OSSL_STORE_find
- Specify what object type is expected

=head1 SYNOPSIS

 #include <openssl/store.h>

 int OSSL_STORE_expect(OSSL_STORE_CTX *ctx, int expected_type);

 int OSSL_STORE_supports_search(OSSL_STORE_CTX *ctx, int criterion_type);

 int OSSL_STORE_find(OSSL_STORE_CTX *ctx, OSSL_STORE_SEARCH *search);

=head1 DESCRIPTION

OSSL_STORE_expect() helps applications filter what OSSL_STORE_load() returns
by specifying a B<OSSL_STORE_INFO> type.
For example, if C<file:/foo/bar/store.pem> contains several different objects
and only the certificates are interesting, the application can simply say
that it expects the type B<OSSL_STORE_INFO_CERT>.
All known object types (see L<OSSL_STORE_INFO(3)/SUPPORTED OBJECTS>)
except for B<OSSL_STORE_INFO_NAME> are supported.

OSSL_STORE_find() helps applications specify a criterion for a more fine
grained search of objects.

OSSL_STORE_supports_search() checks if the loader of the given OSSL_STORE
context supports the given search type.
See L<OSSL_STORE_SEARCH/SUPPORTED CRITERION TYPES> for information on the
supported search criterion types.

OSSL_STORE_expect() and OSSL_STORE_find I<must> be called before the first
OSSL_STORE_load() of a given session, or they will fail.

=head1 NOTES

If a more elaborate filter is required by the application, a better choice
would be to use a post-processing function.
See L<OSSL_STORE_open(3)> for more information.

However, some loaders may take advantage of the knowledge of an expected type
to make object retrieval more efficient, so if a single type is expected, this
method is usually preferable.

=head1 RETURN VALUES

OSSL_STORE_expect() returns 1 on success, or 0 on failure.

OSSL_STORE_supports_search() returns 1 if the criterion is supported, or 0
otherwise.

OSSL_STORE_find() returns 1 on success, or 0 on failure.

=head1 SEE ALSO

L<ossl_store(7)>, L<OSSL_STORE_INFO(3)>, L<OSSL_STORE_SEARCH(3)>,
L<OSSL_STORE_load(3)>

=head1 HISTORY

OSSL_STORE_expect(), OSSL_STORE_supports_search() and OSSL_STORE_find()
were added in OpenSSL 1.1.1.

=head1 COPYRIGHT

Copyright 2018-2019 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