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_name, ossl_provider_dso,
8 ossl_provider_module_name, ossl_provider_module_path,
9 ossl_provider_teardown, ossl_provider_get_param_types,
10 ossl_provider_get_params - internal provider routines
14 #include "internal/provider.h"
16 OSSL_PROVIDER *ossl_provider_find(OPENSSL_CTX *libctx, const char *name);
17 OSSL_PROVIDER *ossl_provider_new(OPENSSL_CTX *libctx, const char *name,
18 ossl_provider_init_fn *init_function);
19 int ossl_provider_upref(OSSL_PROVIDER *prov);
20 void ossl_provider_free(OSSL_PROVIDER *prov);
23 int ossl_provider_add_module_location(OSSL_PROVIDER *prov, const char *loc);
25 /* Load and initialize the Provider */
26 int ossl_provider_activate(OSSL_PROVIDER *prov);
28 /* Getters for other library functions */
29 const char *ossl_provider_name(OSSL_PROVIDER *prov);
30 const DSO *ossl_provider_dso(OSSL_PROVIDER *prov);
31 const char *ossl_provider_module_name(OSSL_PROVIDER *prov);
32 const char *ossl_provider_module_path(OSSL_PROVIDER *prov);
34 /* Thin wrappers around calls to the provider */
35 void ossl_provider_teardown(const OSSL_PROVIDER *prov);
36 const OSSL_ITEM *ossl_provider_get_param_types(const OSSL_PROVIDER *prov);
37 int ossl_provider_get_params(const OSSL_PROVIDER *prov,
38 const OSSL_PARAM params[]);
42 C<OSSL_PROVIDER> is a type that holds all the necessary information
43 to handle a provider, regardless of if it's built in to the
44 application or the OpenSSL libraries, or if it's a loadable provider
46 Instances of this type are commonly refered to as I<provider object>s.
48 A I<provider object> is always stored in a set of I<provider object>s
49 in the library context.
51 I<provider object>s are reference counted.
53 I<provider object>s are initially inactive, i.e. they are only
54 recorded in the store, but are not used.
55 They are activated with the first call to ossl_provider_activate(),
56 and are inactivated when ossl_provider_free() has been called as many
57 times as ossl_provider_activate() has.
61 ossl_provider_find() finds an existing I<provider object> in the
62 I<provider object> store by C<name>.
63 The I<provider object> it finds gets it's reference count
66 ossl_provider_new() creates a new I<provider object> and stores it in
67 the I<provider object> store, unless there already is one there with
69 The reference counter of a newly created I<provider object> will
70 always be 2; one for being added to the store, and one for the
72 To indicate a built-in provider, the C<init_function> argument must
73 point at the provider initialization function for that provider.
75 ossl_provider_free() decrements a I<provider object>'s reference
76 counter; if it drops to one, the I<provider object> will be
77 inactivated (it's teardown function is called) but kept in the store;
78 if it drops down to zero, the associated module will be unloaded if
79 one was loaded, and the I<provider object> will be freed.
81 ossl_provider_add_module_location() adds a location to look for a
84 ossl_provider_activate() "activates" the provider for the given
86 What "activates" means depends on what type of I<provider object> it
93 If an initialization function was given with ossl_provider_new(), that
94 function will get called.
98 If no intialization function was given with ossl_provider_new(), a
99 loadable module with the C<name> that was given to ossl_provider_new()
100 will be located and loaded, then the symbol C<OSSL_provider_init> will
101 be located in that module, and called.
105 ossl_provider_name() returns the name that was given with
108 ossl_provider_dso() returns a reference to the module, for providers
109 that come in the form of loadable modules.
111 ossl_provider_module_name() returns the file name of the module, for
112 providers that come in the form of loadable modules.
114 ossl_provider_module_path() returns the full path of the module file,
115 for providers that come in the form of loadable modules.
117 ossl_provider_teardown() calls the provider's C<teardown> function, if
118 the provider has one.
120 ossl_provider_get_param_types() calls the provider's C<get_param_types>
121 function, if the provider has one.
122 It should return an array of C<OSSL_ITEM> to describe all the
123 parameters that the provider has for the I<provider object>.
125 ossl_provider_get_params() calls the provider's parameter request
127 It should treat the given C<OSSL_PARAM> array as described in
132 Locating a provider module happens as follows:
138 Look in each directory given by ossl_provider_add_module_location().
142 Look in the directory given by the environment variable
147 Look in the directory given by the OpenSSL built in macro
154 ossl_provider_find() and ossl_provider_new() return a pointer to a
155 I<provider object> (C<OSSL_PROVIDER>) on success, or B<NULL> on error.
157 ossl_provider_upref() returns the value of the reference counter after
158 it has been incremented.
160 ossl_provider_free() doesn't return any value.
162 ossl_provider_add_module_location() and ossl_provider_activate()
163 return 1 on success, or 0 on error.
165 ossl_provider_name(), ossl_provider_dso(),
166 ossl_provider_module_name(), and ossl_provider_module_path() return a
167 pointer to their respective data if it's available, otherwise B<NULL>
170 ossl_provider_teardown() doesnt't return any value.
172 ossl_provider_get_param_types() returns a pointer to an C<OSSL_ITEM>
173 array if this function is available in the provider, otherwise
176 ossl_provider_get_params() returns 1 on success, or 0 on error.
177 If this function isn't available in the provider, 0 is returned.
181 L<OSSL_PROVIDER(3)>, L<provider(7)>
185 The functions described here were all added in OpenSSL 3.0.
189 Copyright 2019 The OpenSSL Project Authors. All Rights Reserved.
191 Licensed under the Apache License 2.0 (the "License"). You may not use
192 this file except in compliance with the License. You can obtain a copy
193 in the file LICENSE in the source distribution or at
194 L<https://www.openssl.org/source/license.html>.