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 "SUPPORED 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 to OpenSSL 1.1.1.

COPYRIGHT

       Copyright 2018 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>.