coap_oscore_internal.h

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/* -*- Mode: C; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 
/*
 * coap_oscore_internal.h - Object Security for Constrained RESTful Environments
 *                          (OSCORE) support for libcoap
 *
 * Copyright (C) 2019-2023 Olaf Bergmann <bergmann@tzi.org>
 * Copyright (C) 2021-2023 Jon Shallow <supjps-libcoap:jpshallow.com>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * This file is part of the CoAP library libcoap. Please see README for terms
 * of use.
 */
 
#ifndef COAP_OSCORE_INTERNAL_H_
#define COAP_OSCORE_INTERNAL_H_
 
#include "oscore/oscore_context.h"
 
struct coap_oscore_conf_t {
  coap_bin_const_t *master_secret; 
  coap_bin_const_t *master_salt;   
  coap_bin_const_t *sender_id;     
  coap_bin_const_t *id_context;    
  coap_bin_const_t **recipient_id; 
  uint32_t recipient_id_count;     
  uint32_t replay_window;          
  uint32_t ssn_freq;               
  cose_alg_t aead_alg;             
  cose_hkdf_alg_t hkdf_alg;        
  uint32_t rfc8613_b_1_2;          
  uint32_t rfc8613_b_2;            
  /* General Testing */
  uint32_t break_sender_key;     
  uint32_t break_recipient_key;  
  /* SSN handling (not in oscore_config[]) */
  coap_oscore_save_seq_num_t save_seq_num_func; 
  void *save_seq_num_func_param; 
  uint64_t start_seq_num;        
};
 
typedef enum oscore_partial_iv_t {
  OSCORE_SEND_NO_IV,  
  OSCORE_SEND_PARTIAL_IV 
} oscore_partial_iv_t;
 
coap_pdu_t *coap_oscore_new_pdu_encrypted(coap_session_t *session,
                                          coap_pdu_t *pdu,
                                          coap_bin_const_t *kid_context,
                                          oscore_partial_iv_t send_partial_iv);
 
struct coap_pdu_t *coap_oscore_decrypt_pdu(coap_session_t *session,
                                           coap_pdu_t *pdu);
 
void coap_delete_all_oscore(coap_context_t *context);
 
void coap_delete_oscore_associations(coap_session_t *session);
 
size_t coap_oscore_overhead(coap_session_t *session, coap_pdu_t *pdu);
 
int coap_rebuild_pdu_for_proxy(coap_pdu_t *pdu);
 
int coap_oscore_initiate(coap_session_t *session,
                         coap_oscore_conf_t *oscore_conf);
 
#endif /* COAP_OSCORE_INTERNAL_H */