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3 Copyright (C) 2013 GNUnet e.V.
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20 * @author Christian Grothoff
23 * Identity service; implements identity management for GNUnet
25 * @defgroup identity Identity service
26 * Identity management.
28 * Egos in GNUnet are ECDSA keys. You assume an ego by using (signing
29 * with) a particular private key. As GNUnet users are expected to
30 * have many egos, we need an identity service to allow users to
31 * manage their egos. The identity service manages the egos (private
32 * keys) of the local user; it does NOT manage egos of other users
33 * (public keys). For giving names to other users and manage their
34 * public keys securely, we use GNS.
36 * @see [Documentation](https://gnunet.org/identity-subsystem)
40 #ifndef GNUNET_IDENTITY_SERVICE_H
41 #define GNUNET_IDENTITY_SERVICE_H
46 #if 0 /* keep Emacsens' auto-indent happy */
51 #include "gnunet_util_lib.h"
55 * Version number of GNUnet Identity API.
57 #define GNUNET_IDENTITY_VERSION 0x00000000
60 * Handle to access the identity service.
62 struct GNUNET_IDENTITY_Handle;
67 struct GNUNET_IDENTITY_Ego;
70 * Handle for an operation with the identity service.
72 struct GNUNET_IDENTITY_Operation;
76 * Obtain the ECC key associated with a ego.
79 * @return associated ECC key, valid as long as the ego is valid
81 const struct GNUNET_CRYPTO_EcdsaPrivateKey *
82 GNUNET_IDENTITY_ego_get_private_key (const struct GNUNET_IDENTITY_Ego *ego);
86 * Obtain the ego representing 'anonymous' users.
88 * @return handle for the anonymous user, must not be freed
90 const struct GNUNET_IDENTITY_Ego *
91 GNUNET_IDENTITY_ego_get_anonymous (void);
95 * Get the identifier (public key) of an ego.
97 * @param ego identity handle with the private key
98 * @param pk set to ego's public key
101 GNUNET_IDENTITY_ego_get_public_key (const struct GNUNET_IDENTITY_Ego *ego,
102 struct GNUNET_CRYPTO_EcdsaPublicKey *pk);
106 * Method called to inform about the egos of this peer.
108 * When used with #GNUNET_IDENTITY_connect, this function is
109 * initially called for all egos and then again whenever a
110 * ego's name changes or if it is deleted. At the end of
111 * the initial pass over all egos, the function is once called
112 * with 'NULL' for @a ego. That does NOT mean that the callback won't
113 * be invoked in the future or that there was an error.
115 * When used with #GNUNET_IDENTITY_create or #GNUNET_IDENTITY_get,
116 * this function is only called ONCE, and 'NULL' being passed in
117 * @a ego does indicate an error (i.e. name is taken or no default
118 * value is known). If @a ego is non-NULL and if '*ctx'
119 * is set in those callbacks, the value WILL be passed to a subsequent
120 * call to the identity callback of #GNUNET_IDENTITY_connect (if
121 * that one was not NULL).
123 * When an identity is renamed, this function is called with the
124 * (known) @a ego but the NEW @a name.
126 * When an identity is deleted, this function is called with the
127 * (known) ego and "NULL" for the @a name. In this case,
128 * the @a ego is henceforth invalid (and the @a ctx should also be
132 * @param ego ego handle
133 * @param ctx context for application to store data for this ego
134 * (during the lifetime of this process, initially NULL)
135 * @param name name assigned by the user for this ego,
136 * NULL if the user just deleted the ego and it
137 * must thus no longer be used
140 (*GNUNET_IDENTITY_Callback)(void *cls,
141 struct GNUNET_IDENTITY_Ego *ego,
147 * Connect to the identity service.
149 * @param cfg Configuration to contact the identity service.
150 * @param cb function to call on all identity events, can be NULL
151 * @param cb_cls closure for @a cb
152 * @return handle to communicate with identity service
154 struct GNUNET_IDENTITY_Handle *
155 GNUNET_IDENTITY_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
156 GNUNET_IDENTITY_Callback cb,
161 * Obtain the ego that is currently preferred/default for a service.
163 * @param id identity service to query
164 * @param service_name for which service is an identity wanted
165 * @param cb function to call with the result (will only be called once)
166 * @param cb_cls closure for @a cb
167 * @return handle to abort the operation
169 struct GNUNET_IDENTITY_Operation *
170 GNUNET_IDENTITY_get (struct GNUNET_IDENTITY_Handle *id,
171 const char *service_name,
172 GNUNET_IDENTITY_Callback cb,
177 * Function called once the requested operation has
181 * @param emsg NULL on success, otherwise an error message
184 (*GNUNET_IDENTITY_Continuation)(void *cls,
189 * Set the preferred/default ego for a service.
191 * @param id identity service to inform
192 * @param service_name for which service is an identity set
193 * @param ego new default identity to be set for this service
194 * @param cont function to call once the operation finished
195 * @param cont_cls closure for @a cont
196 * @return handle to abort the operation
198 struct GNUNET_IDENTITY_Operation *
199 GNUNET_IDENTITY_set (struct GNUNET_IDENTITY_Handle *id,
200 const char *service_name,
201 struct GNUNET_IDENTITY_Ego *ego,
202 GNUNET_IDENTITY_Continuation cont,
207 * Disconnect from identity service.
209 * @param h identity service to disconnect
212 GNUNET_IDENTITY_disconnect (struct GNUNET_IDENTITY_Handle *h);
216 * Create a new ego with the given name.
218 * @param id identity service to use
219 * @param name desired name
220 * @param cont function to call with the result (will only be called once)
221 * @param cont_cls closure for @a cont
222 * @return handle to abort the operation
224 struct GNUNET_IDENTITY_Operation *
225 GNUNET_IDENTITY_create (struct GNUNET_IDENTITY_Handle *id,
227 GNUNET_IDENTITY_Continuation cont,
232 * Renames an existing ego.
234 * @param id identity service to use
235 * @param old_name old name
236 * @param new_name desired new name
237 * @param cb function to call with the result (will only be called once)
238 * @param cb_cls closure for @a cb
239 * @return handle to abort the operation
241 struct GNUNET_IDENTITY_Operation *
242 GNUNET_IDENTITY_rename (struct GNUNET_IDENTITY_Handle *id,
243 const char *old_name,
244 const char *new_name,
245 GNUNET_IDENTITY_Continuation cb,
250 * Delete an existing ego.
252 * @param id identity service to use
253 * @param name name of the identity to delete
254 * @param cb function to call with the result (will only be called once)
255 * @param cb_cls closure for @a cb
256 * @return handle to abort the operation
258 struct GNUNET_IDENTITY_Operation *
259 GNUNET_IDENTITY_delete (struct GNUNET_IDENTITY_Handle *id,
261 GNUNET_IDENTITY_Continuation cb,
266 * Cancel an identity operation. Note that the operation MAY still
267 * be executed; this merely cancels the continuation; if the request
268 * was already transmitted, the service may still choose to complete
271 * @param op operation to cancel
274 GNUNET_IDENTITY_cancel (struct GNUNET_IDENTITY_Operation *op);
277 /* ************* convenience API to lookup an ego ***************** */
280 * Function called with the result.
283 * @param ego NULL on error / ego not found
286 (*GNUNET_IDENTITY_EgoCallback)(void *cls,
287 const struct GNUNET_IDENTITY_Ego *ego);
290 * Handle for ego lookup.
292 struct GNUNET_IDENTITY_EgoLookup;
296 * Lookup an ego by name.
298 * @param cfg configuration to use
299 * @param name name to look up
300 * @param cb callback to invoke with the result
301 * @param cb_cls closure for @a cb
302 * @return NULL on error
304 struct GNUNET_IDENTITY_EgoLookup *
305 GNUNET_IDENTITY_ego_lookup (const struct GNUNET_CONFIGURATION_Handle *cfg,
307 GNUNET_IDENTITY_EgoCallback cb,
312 * Abort ego lookup attempt.
314 * @param el handle for lookup to abort
317 GNUNET_IDENTITY_ego_lookup_cancel (struct GNUNET_IDENTITY_EgoLookup *el);
320 #if 0 /* keep Emacsens' auto-indent happy */
327 /* ifndef GNUNET_IDENTITY_SERVICE_H */
330 /** @} */ /* end of group identity */
332 /* end of gnunet_identity_service.h */