5 ossl_provider_find, ossl_provider_new, ossl_provider_upref,
6 ossl_provider_free, ossl_provider_add_module_location,
7 ossl_provider_activate, ossl_provider_forall_loaded,
8 ossl_provider_name, ossl_provider_dso,
9 ossl_provider_module_name, ossl_provider_module_path,
10 ossl_provider_teardown, ossl_provider_get_param_types,
11 ossl_provider_get_params, ossl_provider_query_operation
12 - internal provider routines
16 #include "internal/provider.h"
18 OSSL_PROVIDER *ossl_provider_find(OPENSSL_CTX *libctx, const char *name);
19 OSSL_PROVIDER *ossl_provider_new(OPENSSL_CTX *libctx, const char *name,
20 ossl_provider_init_fn *init_function);
21 int ossl_provider_upref(OSSL_PROVIDER *prov);
22 void ossl_provider_free(OSSL_PROVIDER *prov);
25 int ossl_provider_add_module_location(OSSL_PROVIDER *prov, const char *loc);
27 /* Load and initialize the Provider */
28 int ossl_provider_activate(OSSL_PROVIDER *prov);
30 /* Iterate over all loaded providers */
31 int ossl_provider_forall_loaded(OPENSSL_CTX *,
32 int (*cb)(OSSL_PROVIDER *provider,
36 /* Getters for other library functions */
37 const char *ossl_provider_name(OSSL_PROVIDER *prov);
38 const DSO *ossl_provider_dso(OSSL_PROVIDER *prov);
39 const char *ossl_provider_module_name(OSSL_PROVIDER *prov);
40 const char *ossl_provider_module_path(OSSL_PROVIDER *prov);
42 /* Thin wrappers around calls to the provider */
43 void ossl_provider_teardown(const OSSL_PROVIDER *prov);
44 const OSSL_ITEM *ossl_provider_get_param_types(const OSSL_PROVIDER *prov);
45 int ossl_provider_get_params(const OSSL_PROVIDER *prov,
46 const OSSL_PARAM params[]);
47 const OSSL_ALGORITHM *ossl_provider_query_operation(const OSSL_PROVIDER *prov,
53 C<OSSL_PROVIDER> is a type that holds all the necessary information
54 to handle a provider, regardless of if it's built in to the
55 application or the OpenSSL libraries, or if it's a loadable provider
57 Instances of this type are commonly refered to as I<provider object>s.
59 A I<provider object> is always stored in a set of I<provider object>s
60 in the library context.
62 I<provider object>s are reference counted.
64 I<provider object>s are initially inactive, i.e. they are only
65 recorded in the store, but are not used.
66 They are activated with the first call to ossl_provider_activate(),
67 and are inactivated when ossl_provider_free() has been called as many
68 times as ossl_provider_activate() has.
72 ossl_provider_find() finds an existing I<provider object> in the
73 I<provider object> store by C<name>.
74 The I<provider object> it finds gets it's reference count
77 ossl_provider_new() creates a new I<provider object> and stores it in
78 the I<provider object> store, unless there already is one there with
80 The reference counter of a newly created I<provider object> will
81 always be 2; one for being added to the store, and one for the
83 To indicate a built-in provider, the C<init_function> argument must
84 point at the provider initialization function for that provider.
86 ossl_provider_free() decrements a I<provider object>'s reference
87 counter; if it drops to one, the I<provider object> will be
88 inactivated (it's teardown function is called) but kept in the store;
89 if it drops down to zero, the associated module will be unloaded if
90 one was loaded, and the I<provider object> will be freed.
92 ossl_provider_add_module_location() adds a location to look for a
95 ossl_provider_activate() "activates" the provider for the given
97 What "activates" means depends on what type of I<provider object> it
104 If an initialization function was given with ossl_provider_new(), that
105 function will get called.
109 If no intialization function was given with ossl_provider_new(), a
110 loadable module with the C<name> that was given to ossl_provider_new()
111 will be located and loaded, then the symbol C<OSSL_provider_init> will
112 be located in that module, and called.
116 ossl_provider_forall_loaded() iterates over all the currently
117 "activated" providers, and calls C<cb> for each of them.
119 ossl_provider_name() returns the name that was given with
122 ossl_provider_dso() returns a reference to the module, for providers
123 that come in the form of loadable modules.
125 ossl_provider_module_name() returns the file name of the module, for
126 providers that come in the form of loadable modules.
128 ossl_provider_module_path() returns the full path of the module file,
129 for providers that come in the form of loadable modules.
131 ossl_provider_teardown() calls the provider's C<teardown> function, if
132 the provider has one.
134 ossl_provider_get_param_types() calls the provider's C<get_param_types>
135 function, if the provider has one.
136 It should return an array of C<OSSL_ITEM> to describe all the
137 parameters that the provider has for the I<provider object>.
139 ossl_provider_get_params() calls the provider's parameter request
141 It should treat the given C<OSSL_PARAM> array as described in
144 ossl_provider_query_operation() calls the provider's
145 C<query_operation> function, if the provider has one.
146 It should return an array of C<OSSL_ALGORITHM> for the given
151 Locating a provider module happens as follows:
157 Look in each directory given by ossl_provider_add_module_location().
161 Look in the directory given by the environment variable
166 Look in the directory given by the OpenSSL built in macro
173 ossl_provider_find() and ossl_provider_new() return a pointer to a
174 I<provider object> (C<OSSL_PROVIDER>) on success, or B<NULL> on error.
176 ossl_provider_upref() returns the value of the reference counter after
177 it has been incremented.
179 ossl_provider_free() doesn't return any value.
181 ossl_provider_add_module_location() and ossl_provider_activate()
182 return 1 on success, or 0 on error.
184 ossl_provider_name(), ossl_provider_dso(),
185 ossl_provider_module_name(), and ossl_provider_module_path() return a
186 pointer to their respective data if it's available, otherwise B<NULL>
189 ossl_provider_teardown() doesnt't return any value.
191 ossl_provider_get_param_types() returns a pointer to an C<OSSL_ITEM>
192 array if this function is available in the provider, otherwise
195 ossl_provider_get_params() returns 1 on success, or 0 on error.
196 If this function isn't available in the provider, 0 is returned.
200 L<OSSL_PROVIDER(3)>, L<provider(7)>
204 The functions described here were all added in OpenSSL 3.0.
208 Copyright 2019 The OpenSSL Project Authors. All Rights Reserved.
210 Licensed under the Apache License 2.0 (the "License"). You may not use
211 this file except in compliance with the License. You can obtain a copy
212 in the file LICENSE in the source distribution or at
213 L<https://www.openssl.org/source/license.html>.