gnunet_abd_service.h

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/*
      This file is part of GNUnet
      Copyright (C) 2012-2014 GNUnet e.V.

      GNUnet is free software: you can redistribute it and/or modify it
      under the terms of the GNU Affero General Public License as published
      by the Free Software Foundation, either version 3 of the License,
      or (at your option) any later version.

      GNUnet is distributed in the hope that it will be useful, but
      WITHOUT ANY WARRANTY; without even the implied warranty of
      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      Affero General Public License for more details.
     
      You should have received a copy of the GNU Affero General Public License
      along with this program.  If not, see <http://www.gnu.org/licenses/>.

     SPDX-License-Identifier: AGPL3.0-or-later
 */

#ifndef GNUNET_ABD_SERVICE_H
#define GNUNET_ABD_SERVICE_H

#include "gnunet_util_lib.h"
#include "gnunet_gns_service.h"
#include "gnunet_identity_service.h"

#ifdef __cplusplus
extern "C"
{
#if 0                           /* keep Emacsens' auto-indent happy */
}
#endif
#endif


struct GNUNET_ABD_Handle;

struct GNUNET_ABD_Request;

/*
* Enum used for checking whether the issuer has the authority to issue credentials or is just a subject
*/
enum GNUNET_ABD_CredentialFlags {

  //Subject had credentials before, but have been revoked now
  GNUNET_ABD_FLAG_REVOKED=0,

  //Subject flag indicates that the subject is a holder of this credential and may present it as such
  GNUNET_ABD_FLAG_SUBJECT=1,

  //Issuer flag is used to signify that the subject is allowed to issue this credential and delegate issuance
  GNUNET_ABD_FLAG_ISSUER=2

};

GNUNET_NETWORK_STRUCT_BEGIN
struct GNUNET_ABD_DelegationRecord {

  uint32_t set_count;

  uint64_t data_size;
};

struct GNUNET_ABD_DelegationRecordSet {

  struct GNUNET_CRYPTO_EcdsaPublicKey subject_key;

  uint32_t subject_attribute_len;
};


GNUNET_NETWORK_STRUCT_END

struct GNUNET_ABD_DelegationSet {

  struct GNUNET_CRYPTO_EcdsaPublicKey subject_key;

  uint32_t subject_attribute_len;

  const char *subject_attribute;
};


struct GNUNET_ABD_Delegation {

  struct GNUNET_CRYPTO_EcdsaPublicKey issuer_key;

  struct GNUNET_CRYPTO_EcdsaPublicKey subject_key;

  uint32_t issuer_attribute_len;

  const char *issuer_attribute;

  uint32_t subject_attribute_len;

  const char *subject_attribute;
};


struct GNUNET_ABD_Delegate {

  struct GNUNET_CRYPTO_EcdsaPublicKey issuer_key;

  struct GNUNET_CRYPTO_EcdsaPublicKey subject_key;

  struct GNUNET_CRYPTO_EcdsaSignature signature;

  struct GNUNET_TIME_Absolute expiration;

  uint32_t issuer_attribute_len;

  const char *issuer_attribute;

  uint32_t subject_attribute_len;

  const char *subject_attribute;

};

/*
* Enum used for checking whether the issuer has the authority to issue credentials or is just a subject
*/
enum GNUNET_ABD_AlgoDirectionFlags {

  //Subject had credentials before, but have been revoked now
  GNUNET_ABD_FLAG_FORWARD=1 << 0,

  //Subject flag indicates that the subject is a holder of this credential and may present it as such
  GNUNET_ABD_FLAG_BACKWARD=1 << 1

};

struct GNUNET_ABD_Handle *
GNUNET_ABD_connect (const struct GNUNET_CONFIGURATION_Handle *cfg);


void
GNUNET_ABD_disconnect (struct GNUNET_ABD_Handle *handle);


typedef void (*GNUNET_ABD_CredentialResultProcessor) (void *cls,
                                                         unsigned int d_count,
                                                         struct GNUNET_ABD_Delegation *delegation_chain,
                                                         unsigned int c_count,
                                                         struct GNUNET_ABD_Delegate *delegte);
                                                        
typedef void (*GNUNET_ABD_IntermediateResultProcessor) (void *cls,
                                                         struct GNUNET_ABD_Delegation *delegation,
                                                         bool is_bw);

typedef void (*GNUNET_ABD_DelegateResultProcessor) (void *cls,
                                                           uint32_t success);

typedef void (*GNUNET_ABD_RemoveDelegateResultProcessor) (void *cls,
                                                                 uint32_t success);


struct GNUNET_ABD_Request*
GNUNET_ABD_verify (struct GNUNET_ABD_Handle *handle,
                          const struct GNUNET_CRYPTO_EcdsaPublicKey *issuer_key,
                          const char *issuer_attribute,
                          const struct GNUNET_CRYPTO_EcdsaPublicKey *subject_key,
                          uint32_t delegate_count,
                          const struct GNUNET_ABD_Delegate *delegates,
                          enum GNUNET_ABD_AlgoDirectionFlags direction,
                          GNUNET_ABD_CredentialResultProcessor proc,
                          void *proc_cls,
                          GNUNET_ABD_IntermediateResultProcessor,
                          void *proc2_cls);

struct GNUNET_ABD_Request*
GNUNET_ABD_collect (struct GNUNET_ABD_Handle *handle,
                           const struct GNUNET_CRYPTO_EcdsaPublicKey *issuer_key,
                           const char *issuer_attribute,
                           const struct GNUNET_CRYPTO_EcdsaPrivateKey *subject_key,
                           enum GNUNET_ABD_AlgoDirectionFlags direction,
                           GNUNET_ABD_CredentialResultProcessor proc,
                           void *proc_cls,
                           GNUNET_ABD_IntermediateResultProcessor,
                           void *proc2_cls);

struct GNUNET_ABD_Request *
GNUNET_ABD_add_delegation (struct GNUNET_ABD_Handle *handle,
                                  struct GNUNET_IDENTITY_Ego *issuer,
                                  const char *attribute,
                                  struct GNUNET_CRYPTO_EcdsaPublicKey *subject,
                                  const char *delegated_attribute,
                                  GNUNET_ABD_DelegateResultProcessor proc,
                                  void *proc_cls);

struct GNUNET_ABD_Request *
GNUNET_ABD_remove_delegation (struct GNUNET_ABD_Handle *handle,
                                     struct GNUNET_IDENTITY_Ego *issuer,
                                     const char *attribute,
                                     GNUNET_ABD_RemoveDelegateResultProcessor proc,
                                     void *proc_cls);



struct GNUNET_ABD_Delegate*
GNUNET_ABD_delegate_issue (const struct GNUNET_CRYPTO_EcdsaPrivateKey *issuer,
                                    struct GNUNET_CRYPTO_EcdsaPublicKey *subject,
                                    const char *iss_attr,
                                    const char *sub_attr,
                                    struct GNUNET_TIME_Absolute *expiration);


void
GNUNET_ABD_request_cancel (struct GNUNET_ABD_Request *lr);


#if 0                           /* keep Emacsens' auto-indent happy */
{
#endif
#ifdef __cplusplus
}
#endif

#endif
  /* end of group */