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OSSL_STORE_EXPECT(3) OpenSSL OSSL_STORE_EXPECT(3)
 

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

 #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);

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.

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.

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.

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

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

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>.
2018-11-20 1.1.1a

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