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 2016-2021 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>.