1OSSL_STORE_EXPECT(3ossl)            OpenSSL           OSSL_STORE_EXPECT(3ossl)
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NAME

6       OSSL_STORE_expect, OSSL_STORE_supports_search, OSSL_STORE_find -
7       Specify what object type is expected
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SYNOPSIS

10        #include <openssl/store.h>
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12        int OSSL_STORE_expect(OSSL_STORE_CTX *ctx, int expected_type);
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14        int OSSL_STORE_supports_search(OSSL_STORE_CTX *ctx, int criterion_type);
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16        int OSSL_STORE_find(OSSL_STORE_CTX *ctx, OSSL_STORE_SEARCH *search);
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DESCRIPTION

19       OSSL_STORE_expect() helps applications filter what OSSL_STORE_load()
20       returns by specifying a OSSL_STORE_INFO type.  By default, no
21       expectations on the types of objects to be loaded are made.
22       expected_type may be 0 to indicate explicitly that no expectation is
23       made, or it may be any of the known object types (see "SUPPORTED
24       OBJECTS" in OSSL_STORE_INFO(3)) except for OSSL_STORE_INFO_NAME.  For
25       example, if "file:/foo/bar/store.pem" contains several objects of
26       different type and only certificates are interesting, the application
27       can simply say that it expects the type OSSL_STORE_INFO_CERT.
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29       OSSL_STORE_find() helps applications specify a criterion for a more
30       fine grained search of objects.
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32       OSSL_STORE_supports_search() checks if the loader of the given
33       OSSL_STORE context supports the given search type.  See "SUPPORTED
34       CRITERION TYPES" in OSSL_STORE_SEARCH(3) for information on the
35       supported search criterion types.
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37       OSSL_STORE_expect() and OSSL_STORE_find must be called before the first
38       OSSL_STORE_load() of a given session, or they will fail.
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NOTES

41       If a more elaborate filter is required by the application, a better
42       choice would be to use a post-processing function.  See
43       OSSL_STORE_open(3) for more information.
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45       However, some loaders may take advantage of the knowledge of an
46       expected type to make object retrieval more efficient, so if a single
47       type is expected, this method is usually preferable.
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RETURN VALUES

50       OSSL_STORE_expect() returns 1 on success, or 0 on failure.
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52       OSSL_STORE_supports_search() returns 1 if the criterion is supported,
53       or 0 otherwise.
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55       OSSL_STORE_find() returns 1 on success, or 0 on failure.
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SEE ALSO

58       ossl_store(7), OSSL_STORE_INFO(3), OSSL_STORE_SEARCH(3),
59       OSSL_STORE_load(3)
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HISTORY

62       OSSL_STORE_expect(), OSSL_STORE_supports_search() and OSSL_STORE_find()
63       were added in OpenSSL 1.1.1.
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66       Copyright 2018-2021 The OpenSSL Project Authors. All Rights Reserved.
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68       Licensed under the Apache License 2.0 (the "License").  You may not use
69       this file except in compliance with the License.  You can obtain a copy
70       in the file LICENSE in the source distribution or at
71       <https://www.openssl.org/source/license.html>.
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753.0.5                             2022-11-01          OSSL_STORE_EXPECT(3ossl)
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