NAME¶

OSSL_PROVIDER_set_default_search_path, OSSL_PROVIDER, OSSL_PROVIDER_load, OSSL_PROVIDER_try_load, OSSL_PROVIDER_unload, OSSL_PROVIDER_available, OSSL_PROVIDER_do_all, OSSL_PROVIDER_gettable_params, OSSL_PROVIDER_get_params, OSSL_PROVIDER_query_operation, OSSL_PROVIDER_unquery_operation, OSSL_PROVIDER_get0_provider_ctx, OSSL_PROVIDER_get0_dispatch, OSSL_PROVIDER_add_builtin, OSSL_PROVIDER_get0_name, OSSL_PROVIDER_get_capabilities, OSSL_PROVIDER_self_test - provider routines

SYNOPSIS¶

 #include <openssl/provider.h>
 typedef struct ossl_provider_st OSSL_PROVIDER;
 int OSSL_PROVIDER_set_default_search_path(OSSL_LIB_CTX *libctx,
                                           const char *path);
 OSSL_PROVIDER *OSSL_PROVIDER_load(OSSL_LIB_CTX *libctx, const char *name);
 OSSL_PROVIDER *OSSL_PROVIDER_try_load(OSSL_LIB_CTX *libctx, const char *name,
                                       int retain_fallbacks);
 int OSSL_PROVIDER_unload(OSSL_PROVIDER *prov);
 int OSSL_PROVIDER_available(OSSL_LIB_CTX *libctx, const char *name);
 int OSSL_PROVIDER_do_all(OSSL_LIB_CTX *ctx,
                          int (*cb)(OSSL_PROVIDER *provider, void *cbdata),
                          void *cbdata);
 const OSSL_PARAM *OSSL_PROVIDER_gettable_params(OSSL_PROVIDER *prov);
 int OSSL_PROVIDER_get_params(OSSL_PROVIDER *prov, OSSL_PARAM params[]);
 const OSSL_ALGORITHM *OSSL_PROVIDER_query_operation(const OSSL_PROVIDER *prov,
                                                     int operation_id,
                                                     int *no_cache);
 void OSSL_PROVIDER_unquery_operation(const OSSL_PROVIDER *prov,
                                      int operation_id,
                                      const OSSL_ALGORITHM *algs);
 void *OSSL_PROVIDER_get0_provider_ctx(const OSSL_PROVIDER *prov);
 const OSSL_DISPATCH *OSSL_PROVIDER_get0_dispatch(const OSSL_PROVIDER *prov);
 int OSSL_PROVIDER_add_builtin(OSSL_LIB_CTX *libctx, const char *name,
                               ossl_provider_init_fn *init_fn);
 const char *OSSL_PROVIDER_get0_name(const OSSL_PROVIDER *prov);
 int OSSL_PROVIDER_get_capabilities(const OSSL_PROVIDER *prov,
                                    const char *capability,
                                    OSSL_CALLBACK *cb,
                                    void *arg);
 int OSSL_PROVIDER_self_test(const OSSL_PROVIDER *prov);

DESCRIPTION¶

OSSL_PROVIDER is a type that holds internal information about implementation providers (see provider(7) for information on what a provider is). A provider can be built in to the application or the OpenSSL libraries, or can be a loadable module. The functions described here handle both forms.

Some of these functions operate within a library context, please see OSSL_LIB_CTX(3) for further details.

RETURN VALUES¶

OSSL_PROVIDER_set_default_search_path(), OSSL_PROVIDER_add(), OSSL_PROVIDER_unload(), OSSL_PROVIDER_get_params() and OSSL_PROVIDER_get_capabilities() return 1 on success, or 0 on error.

OSSL_PROVIDER_load() and OSSL_PROVIDER_try_load() return a pointer to a provider object on success, or NULL on error.

OSSL_PROVIDER_do_all() returns 1 if the callback cb returns 1 for every provider it is called with, or 0 if any provider callback invocation returns 0; callback processing stops at the first callback invocation on a provider that returns 0.

OSSL_PROVIDER_available() returns 1 if the named provider is available, otherwise 0.

OSSL_PROVIDER_gettable_params() returns a pointer to an array of constant OSSL_PARAM(3), or NULL if none is provided.

OSSL_PROVIDER_get_params() and returns 1 on success, or 0 on error.

OSSL_PROVIDER_query_operation() returns an array of OSSL_ALGORITHM or NULL on error.

OSSL_PROVIDER_self_test() returns 1 if the self tests pass, or 0 on error.

EXAMPLES¶

This demonstrates how to load the provider module "foo" and ask for its build information.

 #include <openssl/params.h>
 #include <openssl/provider.h>
 #include <openssl/err.h>
 OSSL_PROVIDER *prov = NULL;
 const char *build = NULL;
 OSSL_PARAM request[] = {
     { "buildinfo", OSSL_PARAM_UTF8_PTR, &build, 0, 0 },
     { NULL, 0, NULL, 0, 0 }
 };
 if ((prov = OSSL_PROVIDER_load(NULL, "foo")) != NULL
     && OSSL_PROVIDER_get_params(prov, request))
     printf("Provider 'foo' buildinfo: %s\n", build);
 else
     ERR_print_errors_fp(stderr);

SEE ALSO¶

openssl-core.h(7), OSSL_LIB_CTX(3), provider(7)

HISTORY¶

The type and functions described here were added in OpenSSL 3.0.

COPYRIGHT¶

Copyright 2019-2023 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>.