NAME
ossl_store - Store retrieval functions
SYNOPSIS
#include <openssl/store.h>
DESCRIPTION
General
A STORE is a layer of functionality to retrieve a number of
supported objects from a repository of any kind, addressable
as a filename 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 OSSL_STORE_INFO, from which an OpenSSL type can be retrieved.
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 "libcrypto". See ossl_store-file(7) for more information.
UI_METHOD
and pass phrases
The OSS_STORE API does nothing to enforce any
specific format or encoding on the pass phrase that the
UI_METHOD provides. However, the pass phrase is
expected to be UTF-8 encoded. The result of any other
encoding is undefined.
EXAMPLES
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_CERT:
/* 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);
SEE ALSO
OSSL_STORE_INFO(3), OSSL_STORE_LOADER(3), OSSL_STORE_open(3), OSSL_STORE_expect(3), OSSL_STORE_SEARCH(3)
COPYRIGHT
Copyright 2016-2018 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the Apache License 2.0 (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 <https://www.openssl.org/source/license.html>;.