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OSSL_STORE_expect(3)                OpenSSL               OSSL_STORE_expect(3)



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

LIBRARY
       libcrypto, -lcrypto

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>.



1.1.1                             2018-09-17              OSSL_STORE_expect(3)