6ab6deccd9
Reviewed-by: Matt Caswell <matt@openssl.org> (Merged from https://github.com/openssl/openssl/pull/2688)
102 lines
3.1 KiB
Text
102 lines
3.1 KiB
Text
=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 file name 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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=head2 The 'file' scheme
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Support for the 'file' scheme is already built into C<libcrypto>.
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Since files come in all kinds of formats and content types, the 'file'
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scheme has its own layer of functionality called "file handlers",
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which are used to try to decode diverse types of file contents.
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In case a file is formatted as PEM, each called file handler receives
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the PEM name (everything following any 'C<-----BEGIN >') as well as
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possible PEM headers, together with the decoded PEM body. Since PEM
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formatted files can contain more than one object, the file handlers
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are called upon for each such object.
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If the file isn't determined to be formatted as PEM, the content is
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loaded in raw form in its entirety and passed to the available file
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handlers as is, with no PEM name or headers.
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Each file handler is expected to handle PEM and non-PEM content as
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appropriate. Some may refuse non-PEM content for the sake of
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determinism (for example, there are keys out in the wild that are
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represented as an ASN.1 OCTET STRING. In raw form, it's not easily
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possible to distinguish those from any other data coming as an ASN.1
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OCTET STRING, so such keys would naturally be accepted as PEM files
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only).
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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 2016-2018 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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