=pod
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=head1 NAME
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ossl_store - Store retrieval functions
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=head1 SYNOPSIS
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=for comment generic
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#include <openssl/store.h>
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=head1 DESCRIPTION
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=head2 General
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A STORE is a layer of functionality to retrieve a number of supported
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objects from a repository of any kind, addressable as a filename or
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as a URI.
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The functionality supports the pattern "open a channel to the
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repository", "loop and retrieve one object at a time", and "finish up
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by closing the channel".
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The retrieved objects are returned as a wrapper type B<OSSL_STORE_INFO>,
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from which an OpenSSL type can be retrieved.
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=head2 URI schemes and loaders
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Support for a URI scheme is called a STORE "loader", and can be added
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dynamically from the calling application or from a loadable engine.
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Support for the 'file' scheme is built into C<libcrypto>.
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See L<ossl_store-file(7)> for more information.
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=head2 UI_METHOD and pass phrases
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The B<OSS_STORE> API does nothing to enforce any specific format or
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encoding on the pass phrase that the B<UI_METHOD> provides. However,
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the pass phrase is expected to be UTF-8 encoded. The result of any
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other encoding is undefined.
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=head1 EXAMPLES
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=head2 A generic call
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OSSL_STORE_CTX *ctx = OSSL_STORE_open("file:/foo/bar/data.pem");
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/*
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* OSSL_STORE_eof() simulates file semantics for any repository to signal
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* that no more data can be expected
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*/
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while (!OSSL_STORE_eof(ctx)) {
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OSSL_STORE_INFO *info = OSSL_STORE_load(ctx);
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/*
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* Do whatever is necessary with the OSSL_STORE_INFO,
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* here just one example
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*/
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switch (OSSL_STORE_INFO_get_type(info)) {
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case OSSL_STORE_INFO_X509:
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/* Print the X.509 certificate text */
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X509_print_fp(stdout, OSSL_STORE_INFO_get0_CERT(info));
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/* Print the X.509 certificate PEM output */
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PEM_write_X509(stdout, OSSL_STORE_INFO_get0_CERT(info));
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break;
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}
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}
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OSSL_STORE_close(ctx);
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=head1 SEE ALSO
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L<OSSL_STORE_INFO(3)>, L<OSSL_STORE_LOADER(3)>,
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L<OSSL_STORE_open(3)>, L<OSSL_STORE_expect(3)>,
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L<OSSL_STORE_SEARCH(3)>
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=head1 COPYRIGHT
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Copyright 2016-2020 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the OpenSSL license (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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