NAME

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

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);

DESCRIPTION

       OSSL_STORE_expect() helps applications filter what OSSL_STORE_load() returns by specifying
       a OSSL_STORE_INFO type.  For example, if "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 OSSL_STORE_INFO_CERT.  All known object types (see "SUPPORTED
       OBJECTS" in OSSL_STORE_INFO(3)) except for 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 "SUPPORTED CRITERION TYPES" in OSSL_STORE_SEARCH for
       information on the supported search criterion types.

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

NOTES

       If a more elaborate filter is required by the application, a better choice would be to use
       a post-processing function.  See 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.

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.

SEE ALSO

       ossl_store(7), OSSL_STORE_INFO(3), OSSL_STORE_SEARCH(3), OSSL_STORE_load(3)

HISTORY

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

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 <https://www.openssl.org/source/license.html>.