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3c49e4ff51
Document the OSSL_PROVIDER_get_capabilities() function as well as the provider side support for capabilities. Reviewed-by: Shane Lontis <shane.lontis@oracle.com> (Merged from https://github.com/openssl/openssl/pull/11914)
178 lines
6.6 KiB
Plaintext
178 lines
6.6 KiB
Plaintext
=pod
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=head1 NAME
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OSSL_PROVIDER_set_default_search_path,
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OSSL_PROVIDER, OSSL_PROVIDER_load, OSSL_PROVIDER_unload,
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OSSL_PROVIDER_available, OSSL_PROVIDER_do_all,
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OSSL_PROVIDER_gettable_params, OSSL_PROVIDER_get_params,
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OSSL_PROVIDER_query_operation, OSSL_PROVIDER_get0_provider_ctx,
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OSSL_PROVIDER_add_builtin, OSSL_PROVIDER_name,
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OSSL_PROVIDER_get_capabilities - provider routines
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=head1 SYNOPSIS
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#include <openssl/provider.h>
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typedef struct ossl_provider_st OSSL_PROVIDER;
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void OSSL_PROVIDER_set_default_search_path(OPENSSL_CTX *libctx,
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const char *path);
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OSSL_PROVIDER *OSSL_PROVIDER_load(OPENSSL_CTX *libctx, const char *name);
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int OSSL_PROVIDER_unload(OSSL_PROVIDER *prov);
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int OSSL_PROVIDER_available(OPENSSL_CTX *libctx, const char *name);
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int OSSL_PROVIDER_do_all(OPENSSL_CTX *ctx,
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int (*cb)(OSSL_PROVIDER *provider, void *cbdata),
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void *cbdata);
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const OSSL_PARAM *OSSL_PROVIDER_gettable_params(OSSL_PROVIDER *prov);
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int OSSL_PROVIDER_get_params(OSSL_PROVIDER *prov, OSSL_PARAM params[]);
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const OSSL_ALGORITHM *OSSL_PROVIDER_query_operation(const OSSL_PROVIDER *prov,
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int operation_id,
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int *no_cache);
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void *OSSL_PROVIDER_get0_provider_ctx(const OSSL_PROVIDER *prov);
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int OSSL_PROVIDER_add_builtin(OPENSSL_CTX *libctx, const char *name,
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ossl_provider_init_fn *init_fn);
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const char *OSSL_PROVIDER_name(const OSSL_PROVIDER *prov);
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int OSSL_PROVIDER_get_capabilities(const OSSL_PROVIDER *prov,
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const char *capability,
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OSSL_CALLBACK *cb,
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void *arg);
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=head1 DESCRIPTION
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B<OSSL_PROVIDER> is a type that holds internal information about
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implementation providers (see L<provider(7)> for information on what a
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provider is).
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A provider can be built in to the application or the OpenSSL
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libraries, or can be a loadable module.
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The functions described here handle both forms.
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Some of these functions operate within a library context, please see
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L<OPENSSL_CTX(3)> for further details.
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=head2 Functions
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OSSL_PROVIDER_set_default_search_path() specifies the default search B<path>
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that is to be used for looking for providers in the specified B<libctx>.
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If left unspecified, an environment variable and a fall back default value will
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be used instead.
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OSSL_PROVIDER_add_builtin() is used to add a built in provider to
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B<OSSL_PROVIDER> store in the given library context, by associating a
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provider name with a provider initialization function.
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This name can then be used with OSSL_PROVIDER_load().
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OSSL_PROVIDER_load() loads and initializes a provider.
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This may simply initialize a provider that was previously added with
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OSSL_PROVIDER_add_builtin() and run its given initialization function,
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or load a provider module with the given name and run its provider
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entry point, C<OSSL_provider_init>.
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OSSL_PROVIDER_unload() unloads the given provider.
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For a provider added with OSSL_PROVIDER_add_builtin(), this simply
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runs its teardown function.
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OSSL_PROVIDER_available() checks if a named provider is available
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for use.
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OSSL_PROVIDER_do_all() iterates over all loaded providers, calling
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I<cb> for each one, with the current provider in I<provider> and the
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I<cbdata> that comes from the caller.
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OSSL_PROVIDER_gettable_params() is used to get a provider parameter
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descriptor set as a constant B<OSSL_PARAM> array.
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See L<OSSL_PARAM(3)> for more information.
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OSSL_PROVIDER_get_params() is used to get provider parameter values.
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The caller must prepare the B<OSSL_PARAM> array before calling this
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function, and the variables acting as buffers for this parameter array
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should be filled with data when it returns successfully.
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OSSL_PROVIDER_query_operation() calls the provider's I<query_operation>
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function (see L<provider(7)>), if the provider has one. It returns an
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array of I<OSSL_ALGORITHM> for the given I<operation_id> terminated by an all
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NULL OSSL_ALGORITHM entry. This is considered a low-level function that most
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applications should not need to call.
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OSSL_PROVIDER_get0_provider_ctx() returns the provider context for the given
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provider. The provider context is an opaque handle set by the provider itself
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and is passed back to the provider by libcrypto in various function calls.
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If it is permissible to cache references to this array then I<*no_store> is set
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to 0 or 1 otherwise. If the array is not cacheable then it is assumed to
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have a short lifetime.
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OSSL_PROVIDER_name() returns the name of the given provider.
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OSSL_PROVIDER_get_capabilities() provides information about the capabilities
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supported by the provider specified in I<prov> with the capability name
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I<capability>. For each capability of that name supported by the provider it
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will call the callback I<cb> and supply a set of B<OSSL_PARAM>s describing the
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capability. It will also pass back the argument I<arg>. For more details about
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capabilities and what they can be used for please see
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L<provider-base(7)/CAPABILTIIES>.
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=head1 RETURN VALUES
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OSSL_PROVIDER_add(), OSSL_PROVIDER_unload(), OSSL_PROVIDER_get_params() and
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OSSL_PROVIDER_get_capabilities() return 1 on success, or 0 on error.
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OSSL_PROVIDER_load() returns a pointer to a provider object on
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success, or B<NULL> on error.
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OSSL_PROVIDER_available() returns 1 if the named provider is available,
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otherwise 0.
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OSSL_PROVIDER_gettable_params() returns a pointer to an array
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of constant B<OSSL_PARAM>, or NULL if none is provided.
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OSSL_PROVIDER_get_params() returns 1 on success, or 0 on error.
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OSSL_PROVIDER_query_operation() returns an array of OSSL_ALGORITHM or NULL on
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error.
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=head1 EXAMPLES
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This demonstrates how to load the provider module "foo" and ask for
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its build number.
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OSSL_PROVIDER *prov = NULL;
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const char *build = NULL;
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size_t built_l = 0;
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OSSL_PARAM request[] = {
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{ "build", OSSL_PARAM_UTF8_STRING_PTR, &build, 0, &build_l },
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{ NULL, 0, NULL, 0, NULL }
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};
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if ((prov = OSSL_PROVIDER_load(NULL, "foo")) != NULL
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&& OSSL_PROVIDER_get_params(prov, request))
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printf("Provider 'foo' build %s\n", build);
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else
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ERR_print_errors_fp(stderr);
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=head1 SEE ALSO
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L<openssl-core.h(7)>, L<OPENSSL_CTX(3)>, L<provider(7)>
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=head1 HISTORY
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The type and functions described here were added in OpenSSL 3.0.
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=head1 COPYRIGHT
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Copyright 2019-2020 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (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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