2 This file is part of GNUnet
3 Copyright (C) 2012-2014 GNUnet e.V.
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
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17 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 Boston, MA 02110-1301, USA.
22 * @author Martin Schanzenbach
23 * @author Adnan Husain
26 * API to the Credential service
28 * @defgroup credential Credential service
33 #ifndef GNUNET_CREDENTIAL_SERVICE_H
34 #define GNUNET_CREDENTIAL_SERVICE_H
36 #include "gnunet_util_lib.h"
37 #include "gnunet_gns_service.h"
38 #include "gnunet_identity_service.h"
43 #if 0 /* keep Emacsens' auto-indent happy */
50 * Connection to the Credential service.
52 struct GNUNET_CREDENTIAL_Handle;
55 * Handle to control a lookup operation.
57 struct GNUNET_CREDENTIAL_Request;
60 * Enum used for checking whether the issuer has the authority to issue credentials or is just a subject
62 enum GNUNET_CREDENTIAL_CredentialFlags {
64 //Subject had credentials before, but have been revoked now
65 GNUNET_CREDENTIAL_FLAG_REVOKED=0,
67 //Subject flag indicates that the subject is a holder of this credential and may present it as such
68 GNUNET_CREDENTIAL_FLAG_SUBJECT=1,
70 //Issuer flag is used to signify that the subject is allowed to issue this credential and delegate issuance
71 GNUNET_CREDENTIAL_FLAG_ISSUER=2
75 GNUNET_NETWORK_STRUCT_BEGIN
77 * The credential record
79 struct GNUNET_CREDENTIAL_CredentialRecordData {
82 * The signature for this credential by the issuer
84 struct GNUNET_CRYPTO_EcdsaSignature signature;
89 struct GNUNET_CRYPTO_EccSignaturePurpose purpose;
92 * Public key of the issuer
94 struct GNUNET_CRYPTO_EcdsaPublicKey issuer_key;
97 * Public key of the subject this credential was issued to
99 struct GNUNET_CRYPTO_EcdsaPublicKey subject_key;
102 * Expiration time of this credential
104 uint64_t expiration GNUNET_PACKED;
107 * Followed by the attribute string
113 * The attribute delegation record
115 struct GNUNET_CREDENTIAL_AttributeRecordData {
118 * Public key of the subject this attribute was delegated to
120 struct GNUNET_CRYPTO_EcdsaPublicKey subject_key;
123 * Followed by the attribute that was delegated to as string
131 struct GNUNET_CREDENTIAL_Delegation {
134 * The issuer of the delegation
136 struct GNUNET_CRYPTO_EcdsaPublicKey issuer_key;
139 * Public key of the subject this attribute was delegated to
141 struct GNUNET_CRYPTO_EcdsaPublicKey subject_key;
144 * Length of the attribute
146 uint32_t issuer_attribute_len;
151 const char *issuer_attribute;
154 * Length of the attribute
156 uint32_t subject_attribute_len;
161 const char *subject_attribute;
168 struct GNUNET_CREDENTIAL_Credential {
171 * The issuer of the credential
173 struct GNUNET_CRYPTO_EcdsaPublicKey issuer_key;
176 * Public key of the subject this credential was issued to
178 struct GNUNET_CRYPTO_EcdsaPublicKey subject_key;
181 * Length of the attribute
183 uint32_t issuer_attribute_len;
188 const char *issuer_attribute;
193 GNUNET_NETWORK_STRUCT_END
198 * Initialize the connection with the Credential service.
200 * @param cfg configuration to use
201 * @return handle to the Credential service, or NULL on error
203 struct GNUNET_CREDENTIAL_Handle *
204 GNUNET_CREDENTIAL_connect (const struct GNUNET_CONFIGURATION_Handle *cfg);
208 * Shutdown connection with the Credentail service.
210 * @param handle connection to shut down
213 GNUNET_CREDENTIAL_disconnect (struct GNUNET_CREDENTIAL_Handle *handle);
217 * Iterator called on obtained result for an attribute verification.
220 * @param issuer the issuer of the attribute NULL if verification failed
221 * @param result the result of the verification
222 * @param rd the records in reply
224 typedef void (*GNUNET_CREDENTIAL_VerifyResultProcessor) (void *cls,
225 unsigned int d_count,
226 struct GNUNET_CREDENTIAL_Delegation *delegation_chain,
227 struct GNUNET_CREDENTIAL_Credential *credential);
230 * Iterator called on obtained result for an attribute delegation.
233 * @param success GNUNET_YES if successful
234 * @param result the record data that can be handed to the subject
236 typedef void (*GNUNET_CREDENTIAL_DelegateResultProcessor) (void *cls,
240 * Iterator called on obtained result for an attribute delegation removal.
243 * @param success GNUNET_YES if successful
244 * @param result the record data that can be handed to the subject
246 typedef void (*GNUNET_CREDENTIAL_RemoveDelegateResultProcessor) (void *cls,
253 * Performs attribute verification.
254 * Checks if there is a delegation chain from
255 * attribute ``issuer_attribute'' issued by the issuer
256 * with public key ``issuer_key'' maps to the attribute
257 * ``subject_attribute'' claimed by the subject with key
260 * @param handle handle to the Credential service
261 * @param issuer_key the issuer public key
262 * @param issuer_attribute the issuer attribute
263 * @param subject_key the subject public key
264 * @param subject_attribute the attribute claimed by the subject
265 * @param proc function to call on result
266 * @param proc_cls closure for processor
267 * @return handle to the queued request
269 struct GNUNET_CREDENTIAL_Request*
270 GNUNET_CREDENTIAL_verify (struct GNUNET_CREDENTIAL_Handle *handle,
271 const struct GNUNET_CRYPTO_EcdsaPublicKey *issuer_key,
272 const char *issuer_attribute,
273 const struct GNUNET_CRYPTO_EcdsaPublicKey *subject_key,
274 const char *subject_attribute,
275 GNUNET_CREDENTIAL_VerifyResultProcessor proc,
279 * Delegate an attribute
281 * @param handle handle to the Credential service
282 * @param issuer the ego that should be used to delegate the attribute
283 * @param attribute the name of the attribute to delegate
284 * @param subject the subject of the delegation
285 * @param delegated_attribute the name of the attribute that is delegated to
286 * @return handle to the queued request
288 struct GNUNET_CREDENTIAL_Request *
289 GNUNET_CREDENTIAL_add_delegation (struct GNUNET_CREDENTIAL_Handle *handle,
290 struct GNUNET_IDENTITY_Ego *issuer,
291 const char *attribute,
292 struct GNUNET_CRYPTO_EcdsaPublicKey *subject,
293 const char *delegated_attribute,
294 GNUNET_CREDENTIAL_DelegateResultProcessor proc,
298 * Remove a delegation
300 * @param handle handle to the Credential service
301 * @param issuer the ego that was used to delegate the attribute
302 * @param attribute the name of the attribute that is delegated
303 * @return handle to the queued request
305 struct GNUNET_CREDENTIAL_Request *
306 GNUNET_CREDENTIAL_remove_delegation (struct GNUNET_CREDENTIAL_Handle *handle,
307 struct GNUNET_IDENTITY_Ego *issuer,
308 const char *attribute,
309 GNUNET_CREDENTIAL_RemoveDelegateResultProcessor proc,
315 * Issue an attribute to a subject
317 * @param handle handle to the Credential service
318 * @param issuer the ego that should be used to issue the attribute
319 * @param subject the subject of the attribute
320 * @param attribute the name of the attribute
321 * @param expiration the TTL of the credential
322 * @return handle to the queued request
324 struct GNUNET_CREDENTIAL_CredentialRecordData *
325 GNUNET_CREDENTIAL_issue (struct GNUNET_CREDENTIAL_Handle *handle,
326 const struct GNUNET_CRYPTO_EcdsaPrivateKey *issuer,
327 struct GNUNET_CRYPTO_EcdsaPublicKey *subject,
328 const char *attribute,
329 struct GNUNET_TIME_Absolute *expiration);
333 * Remove a credential
335 * @param handle handle to the Credential service
336 * @param issuer the identity that issued the credential
337 * @param subject the subject of the credential
338 * @param credential the name of the credential
339 * @return handle to the queued request
342 struct GNUNET_CREDENTIAL_IssueRequest *
343 GNUNET_CREDENTIAL_remove (struct GNUNET_CREDENTIAL_Handle *handle,
344 struct GNUNET_IDENTITY_Ego *issuer,
345 struct GNUNET_IDENTITY_Ego *subject,
346 const char *credential,
347 GNUNET_CREDENTIAL_IssueResultProcessor proc,
353 * Cancel pending lookup request
355 * @param lr the lookup request to cancel
358 GNUNET_CREDENTIAL_verify_cancel (struct GNUNET_CREDENTIAL_Request *vr);
361 #if 0 /* keep Emacsens' auto-indent happy */
370 /** @} */ /* end of group */