1OSSL_STORE_EXPECT(3)                OpenSSL               OSSL_STORE_EXPECT(3)
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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.  For example, if
21       "file:/foo/bar/store.pem" contains several different objects and only
22       the certificates are interesting, the application can simply say that
23       it expects the type OSSL_STORE_INFO_CERT.  All known object types (see
24       "SUPPORTED OBJECTS" in OSSL_STORE_INFO(3)) except for
25       OSSL_STORE_INFO_NAME are supported.
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27       OSSL_STORE_find() helps applications specify a criterion for a more
28       fine grained search of objects.
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30       OSSL_STORE_supports_search() checks if the loader of the given
31       OSSL_STORE context supports the given search type.  See "SUPPORED
32       CRITERION TYPES" in OSSL_STORE_SEARCH for information on the supported
33       search criterion types.
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35       OSSL_STORE_expect() and OSSL_STORE_find must be called before the first
36       OSSL_STORE_load() of a given session, or they will fail.
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NOTES

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

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

56       ossl_store(7), OSSL_STORE_INFO(3), OSSL_STORE_SEARCH(3),
57       OSSL_STORE_load(3)
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HISTORY

60       OSSL_STORE_expect(), OSSL_STORE_supports_search() and OSSL_STORE_find()
61       were added in OpenSSL 1.1.1.
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64       Copyright 2018 The OpenSSL Project Authors. All Rights Reserved.
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66       Licensed under the OpenSSL license (the "License").  You may not use
67       this file except in compliance with the License.  You can obtain a copy
68       in the file LICENSE in the source distribution or at
69       <https://www.openssl.org/source/license.html>.
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731.1.1c                            2019-05-28              OSSL_STORE_EXPECT(3)
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