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=pod
=head1 NAME
ossl_store - Store retrieval functions
=head1 SYNOPSIS
=for comment generic
#include <openssl/store.h>
=head1 DESCRIPTION
=head2 General
A STORE is a layer of functionality to retrieve a number of supported
objects from a repository of any kind, addressable as a file name or
as a URI.
The functionality supports the pattern "open a channel to the
repository", "loop and retrieve one object at a time", and "finish up
by closing the channel".
The retrieved objects are returned as a wrapper type B<OSSL_STORE_INFO>,
from which an OpenSSL type can be retrieved.
=head2 URI schemes and loaders
Support for a URI scheme is called a STORE "loader", and can be added
dynamically from the calling application or from a loadable engine.
Support for the 'file' scheme is built into C<libcrypto>.
See L<ossl_store-file(7)> for more information.
=head2 UI_METHOD and pass phrases
The B<OSS_STORE> API does nothing to enforce any specific format or
encoding on the pass phrase that the B<UI_METHOD> provides. However,
the pass phrase is expected to be UTF-8 encoded. The result of any
other encoding is undefined.
=head1 EXAMPLES
=head2 A generic call
OSSL_STORE_CTX *ctx = OSSL_STORE_open("file:/foo/bar/data.pem");
/*
* OSSL_STORE_eof() simulates file semantics for any repository to signal
* that no more data can be expected
*/
while (!OSSL_STORE_eof(ctx)) {
OSSL_STORE_INFO *info = OSSL_STORE_load(ctx);
/*
* Do whatever is necessary with the OSSL_STORE_INFO,
* here just one example
*/
switch (OSSL_STORE_INFO_get_type(info)) {
case OSSL_STORE_INFO_X509:
/* Print the X.509 certificate text */
X509_print_fp(stdout, OSSL_STORE_INFO_get0_CERT(info));
/* Print the X.509 certificate PEM output */
PEM_write_X509(stdout, OSSL_STORE_INFO_get0_CERT(info));
break;
}
}
OSSL_STORE_close(ctx);
=head1 SEE ALSO
L<OSSL_STORE_INFO(3)>, L<OSSL_STORE_LOADER(3)>,
L<OSSL_STORE_open(3)>, L<OSSL_STORE_expect(3)>,
L<OSSL_STORE_SEARCH(3)>
=head1 COPYRIGHT
Copyright 2016-2018 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
L<https://www.openssl.org/source/license.html>.
=cut
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