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64 //Subject had credentials before, but have been revoked now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 sig;
88 * Public key of the issuer
90 struct GNUNET_CRYPTO_EcdsaPublicKey issuer_key;
93 * Signature purpose (data to sign, kind of signature)
95 struct GNUNET_CRYPTO_EccSignaturePurpose purpose;
98 * Public key of the subject this credential was issued to
100 struct GNUNET_CRYPTO_EcdsaPublicKey subject_key;
103 * Flags for this credential
105 uint32_t credential_flags GNUNET_PACKED;
108 * Expiration time of this credential
110 uint64_t expiration GNUNET_PACKED;
113 * Followed by the attribute string
119 * The attribute delegation record
121 struct GNUNET_CREDENTIAL_AttributeRecordData {
124 * Public key of the subject this attribute was delegated to
126 struct GNUNET_CRYPTO_EcdsaPublicKey subject_key;
129 * Followed by the attribute that was delegated to as string
136 GNUNET_NETWORK_STRUCT_END
141 * Initialize the connection with the Credential service.
143 * @param cfg configuration to use
144 * @return handle to the Credential service, or NULL on error
146 struct GNUNET_CREDENTIAL_Handle *
147 GNUNET_CREDENTIAL_connect (const struct GNUNET_CONFIGURATION_Handle *cfg);
151 * Shutdown connection with the Credentail service.
153 * @param handle connection to shut down
156 GNUNET_CREDENTIAL_disconnect (struct GNUNET_CREDENTIAL_Handle *handle);
160 * Iterator called on obtained result for an attribute verification.
163 * @param issuer the issuer of the attribute NULL if verification failed
164 * @param result the result of the verification
165 * @param rd the records in reply
167 typedef void (*GNUNET_CREDENTIAL_VerifyResultProcessor) (void *cls,
168 struct GNUNET_CRYPTO_EcdsaPublicKey *issuer,
172 * Iterator called on obtained result for an attribute issuance.
175 * @param result the record data that can be handed to the subject
177 typedef void (*GNUNET_CREDENTIAL_IssueResultProcessor) (void *cls,
178 struct GNUNET_CREDENTIAL_AttributeRecordData *data);
181 * Iterator called on obtained result for an attribute delegation.
184 * @param success GNUNET_YES if successful
185 * @param result the record data that can be handed to the subject
187 typedef void (*GNUNET_CREDENTIAL_DelegateResultProcessor) (void *cls,
191 * Iterator called on obtained result for an attribute delegation removal.
194 * @param success GNUNET_YES if successful
195 * @param result the record data that can be handed to the subject
197 typedef void (*GNUNET_CREDENTIAL_RemoveDelegateResultProcessor) (void *cls,
204 * Performs attribute verification.
205 * Checks if there is a delegation chain from
206 * attribute ``issuer_attribute'' issued by the issuer
207 * with public key ``issuer_key'' maps to the attribute
208 * ``subject_attribute'' claimed by the subject with key
211 * @param handle handle to the Credential service
212 * @param issuer_key the issuer public key
213 * @param issuer_attribute the issuer attribute
214 * @param subject_key the subject public key
215 * @param subject_attribute the attribute claimed by the subject
216 * @param proc function to call on result
217 * @param proc_cls closure for processor
218 * @return handle to the queued request
220 struct GNUNET_CREDENTIAL_Request*
221 GNUNET_CREDENTIAL_verify (struct GNUNET_CREDENTIAL_Handle *handle,
222 const struct GNUNET_CRYPTO_EcdsaPublicKey *issuer_key,
223 const char *issuer_attribute,
224 const struct GNUNET_CRYPTO_EcdsaPublicKey *subject_key,
225 const char *subject_attribute,
226 GNUNET_CREDENTIAL_VerifyResultProcessor proc,
230 * Delegate an attribute
232 * @param handle handle to the Credential service
233 * @param issuer the ego that should be used to delegate the attribute
234 * @param attribute the name of the attribute to delegate
235 * @param subject the subject of the delegation
236 * @param delegated_attribute the name of the attribute that is delegated to
237 * @return handle to the queued request
239 struct GNUNET_CREDENTIAL_Request *
240 GNUNET_CREDENTIAL_add_delegation (struct GNUNET_CREDENTIAL_Handle *handle,
241 struct GNUNET_IDENTITY_Ego *issuer,
242 const char *attribute,
243 struct GNUNET_CRYPTO_EcdsaPublicKey *subject,
244 const char *delegated_attribute,
245 GNUNET_CREDENTIAL_DelegateResultProcessor proc,
249 * Remove a delegation
251 * @param handle handle to the Credential service
252 * @param issuer the ego that was used to delegate the attribute
253 * @param attribute the name of the attribute that is delegated
254 * @return handle to the queued request
256 struct GNUNET_CREDENTIAL_Request *
257 GNUNET_CREDENTIAL_remove_delegation (struct GNUNET_CREDENTIAL_Handle *handle,
258 struct GNUNET_IDENTITY_Ego *issuer,
259 const char *attribute,
260 GNUNET_CREDENTIAL_RemoveDelegateResultProcessor proc,
266 * Issue an attribute to a subject
268 * @param handle handle to the Credential service
269 * @param issuer the ego that should be used to issue the attribute
270 * @param subject the subject of the attribute
271 * @param attribute the name of the attribute
272 * @return handle to the queued request
274 struct GNUNET_CREDENTIAL_Request *
275 GNUNET_CREDENTIAL_issue (struct GNUNET_CREDENTIAL_Handle *handle,
276 struct GNUNET_IDENTITY_Ego *issuer,
277 struct GNUNET_CRYPTO_EcdsaPublicKey *subject,
278 const char *attribute,
279 GNUNET_CREDENTIAL_IssueResultProcessor proc,
284 * Remove a credential
286 * @param handle handle to the Credential service
287 * @param issuer the identity that issued the credential
288 * @param subject the subject of the credential
289 * @param credential the name of the credential
290 * @return handle to the queued request
293 struct GNUNET_CREDENTIAL_IssueRequest *
294 GNUNET_CREDENTIAL_remove (struct GNUNET_CREDENTIAL_Handle *handle,
295 struct GNUNET_IDENTITY_Ego *issuer,
296 struct GNUNET_IDENTITY_Ego *subject,
297 const char *credential,
298 GNUNET_CREDENTIAL_IssueResultProcessor proc,
304 * Cancel pending lookup request
306 * @param lr the lookup request to cancel
309 GNUNET_CREDENTIAL_verify_cancel (struct GNUNET_CREDENTIAL_Request *vr);
312 #if 0 /* keep Emacsens' auto-indent happy */
321 /** @} */ /* end of group */