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128 lines
4.6 KiB
C
128 lines
4.6 KiB
C
/* -*- Mode: C; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/*
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* Copyright (c) 2018, SICS, RISE AB
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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/**
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* @file oscore.h
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* @brief An implementation of the Object Security for Constrained RESTful
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* Environments (RFC 8613).
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*
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* \author Martin Gunnarsson <martin.gunnarsson@ri.se>
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* major rewrite for libcoap
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* Peter van der Stok <consultancy@vanderstok.org>
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* on request of Fairhair alliance
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* adapted for libcoap integration
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* Jon Shallow <supjps-libcoap@jpshallow.com>
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*
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*/
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#ifndef _OSCORE_H
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#define _OSCORE_H
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#include <coap3/coap_internal.h>
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#include "oscore_cose.h"
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#include "oscore_context.h"
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/**
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* @ingroup internal_api
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* @addtogroup oscore_internal
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* @{
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*/
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/* Estimate your header size, especially when using Proxy-Uri. */
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#define COAP_MAX_HEADER_SIZE 70
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/* OSCORE error messages (to be moved elsewhere */
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#define OSCORE_DECRYPTION_ERROR 100
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#define PACKET_SERIALIZATION_ERROR 102
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/* oscore_cs_params
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* returns cbor array [[param_type], [paramtype, param]]
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*/
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uint8_t *oscore_cs_params(int8_t param, int8_t param_type, size_t *len);
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/* oscore_cs_key_params
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* returns cbor array [paramtype, param]
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*/
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uint8_t *oscore_cs_key_params(cose_curve_t param, int8_t param_type, size_t *len);
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/*
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* oscore_encode_option_value
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*/
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size_t oscore_encode_option_value(uint8_t *option_buffer,
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size_t option_buf_len,
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cose_encrypt0_t *cose,
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uint8_t group,
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uint8_t appendix_b_2);
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/*
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* Decodes the OSCORE option value and places decoded values into the provided
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* cose structure */
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int oscore_decode_option_value(const uint8_t *option_value,
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size_t option_len,
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cose_encrypt0_t *cose);
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/* Creates AAD, creates External AAD and serializes it into the complete AAD
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* structure. Returns serialized size. */
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size_t oscore_prepare_aad(const uint8_t *external_aad_buffer,
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size_t external_aad_len,
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uint8_t *aad_buffer,
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size_t aad_size);
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size_t oscore_prepare_e_aad(oscore_ctx_t *ctx,
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cose_encrypt0_t *cose,
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const uint8_t *oscore_option,
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size_t oscore_option_len,
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coap_bin_const_t *sender_public_key,
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uint8_t *external_aad_ptr,
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size_t external_aad_size);
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/* Creates Nonce */
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void oscore_generate_nonce(cose_encrypt0_t *ptr,
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oscore_ctx_t *ctx,
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uint8_t *buffer,
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uint8_t size);
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/*Return 1 if OK, Error code otherwise */
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uint8_t oscore_validate_sender_seq(oscore_recipient_ctx_t *ctx,
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cose_encrypt0_t *cose);
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/* Return 0 if SEQ MAX, return 1 if OK */
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uint8_t oscore_increment_sender_seq(oscore_ctx_t *ctx);
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/* Restore the sequence number and replay-window to the previous state. This is
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* to be used when decryption fail. */
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void oscore_roll_back_seq(oscore_recipient_ctx_t *ctx);
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/** @} */
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#endif /* _OSCORE_H */
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