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.\" ========================================================================
.\"
.IX Title "OSSL_STORE_EXPECT 3"
.TH OSSL_STORE_EXPECT 3 "2023-05-30" "3.0.9" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
OSSL_STORE_expect,
OSSL_STORE_supports_search,
OSSL_STORE_find
\&\- Specify what object type is expected
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #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);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBOSSL_STORE_expect()\fR helps applications filter what \fBOSSL_STORE_load()\fR returns
by specifying a \fB\s-1OSSL_STORE_INFO\s0\fR type.
By default, no expectations on the types of objects to be loaded are made.
\&\fIexpected_type\fR may be 0 to indicate explicitly that no expectation is made,
or it may be any of the known object types (see
\&\*(L"\s-1SUPPORTED OBJECTS\*(R"\s0 in \s-1\fBOSSL_STORE_INFO\s0\fR\|(3)) except for \fB\s-1OSSL_STORE_INFO_NAME\s0\fR.
For example, if \f(CW\*(C`file:/foo/bar/store.pem\*(C'\fR contains several objects of different
type and only certificates are interesting, the application can simply say
that it expects the type \fB\s-1OSSL_STORE_INFO_CERT\s0\fR.
.PP
\&\fBOSSL_STORE_find()\fR helps applications specify a criterion for a more fine
grained search of objects.
.PP
\&\fBOSSL_STORE_supports_search()\fR checks if the loader of the given \s-1OSSL_STORE\s0
context supports the given search type.
See \*(L"\s-1SUPPORTED CRITERION TYPES\*(R"\s0 in \s-1\fBOSSL_STORE_SEARCH\s0\fR\|(3) for information on the
supported search criterion types.
.PP
\&\fBOSSL_STORE_expect()\fR and OSSL_STORE_find \fImust\fR be called before the first
\&\fBOSSL_STORE_load()\fR of a given session, or they will fail.
.SH "NOTES"
.IX Header "NOTES"
If a more elaborate filter is required by the application, a better choice
would be to use a post-processing function.
See \fBOSSL_STORE_open\fR\|(3) for more information.
.PP
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.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBOSSL_STORE_expect()\fR returns 1 on success, or 0 on failure.
.PP
\&\fBOSSL_STORE_supports_search()\fR returns 1 if the criterion is supported, or 0
otherwise.
.PP
\&\fBOSSL_STORE_find()\fR returns 1 on success, or 0 on failure.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBossl_store\fR\|(7), \s-1\fBOSSL_STORE_INFO\s0\fR\|(3), \s-1\fBOSSL_STORE_SEARCH\s0\fR\|(3),
\&\fBOSSL_STORE_load\fR\|(3)
.SH "HISTORY"
.IX Header "HISTORY"
\&\fBOSSL_STORE_expect()\fR, \fBOSSL_STORE_supports_search()\fR and \fBOSSL_STORE_find()\fR
were added in OpenSSL 1.1.1.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2018\-2021 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the Apache License 2.0 (the \*(L"License\*(R").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.