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https://github.com/obgm/libcoap.git
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e3a662a934
Includes some porting ideas from qursa-uc3m libcoap-wolfssl work. Some common ASN1 code moved from coap_gnutls.c to coap_asn1.c to support RPK. WolfSSL build $ ./configure --enable-all --enable-dtls13 CFLAGS="-DBUILD_TLS_PSK_WITH_AES_128_CCM -DHAVE_RPK" Interoperability requirements DTLS1.3 downgrade requires https://github.com/eclipse/tinydtls/pull/230 https://github.com/wolfSSL/wolfssl/pull/7367 TLS1.3 downgrade requires https://github.com/wolfSSL/wolfssl/pull/7367 (D)TLS1.2 use of RPK requires https://github.com/wolfSSL/wolfssl/pull/7375 MbedTLS using TLS_ECDHE_PSK_WITH_CHACHA20_POLY1305_SHA256 requires https://github.com/wolfSSL/wolfssl/pull/7132 GnuTLS using PSK and TLS1.3 requires https://github.com/wolfSSL/wolfssl/pull/7407
105 lines
2.5 KiB
C
105 lines
2.5 KiB
C
/*
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* coap_asn1_internal.h -- ASN.1 functions for libcoap
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*
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* Copyright (C) 2020-2024 Jon Shallow <supjps-libcoap@jpshallow.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* This file is part of the CoAP library libcoap. Please see README for terms
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* of use.
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*/
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/**
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* @file coap_asn1_internal.h
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* @brief CoAP ASN.1 internal information
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*/
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#ifndef COAP_ASN1_INTERNAL_H_
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#define COAP_ASN1_INTERNAL_H_
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#include "coap_internal.h"
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/**
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* @ingroup internal_api
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* @defgroup asn1 ASN.1 Support
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* Internal API for CoAP ASN.1 handling
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* @{
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*/
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typedef enum {
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COAP_ASN1_NONE = 0,
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COAP_ASN1_INTEGER = 2,
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COAP_ASN1_BITSTRING = 3,
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COAP_ASN1_OCTETSTRING = 4,
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COAP_ASN1_IDENTIFIER = 6,
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} coap_asn1_tag_t;
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/**
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* Callback to validate the asn1 tag and data.
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*
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* Internal function.
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*
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* @param data The start of the tag and data
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* @param size The size of the tag and data
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*
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* @return @c 1 if pass, else @c 0 if fail
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*/
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typedef int (*asn1_validate)(const uint8_t *data, size_t size);
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/**
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* Get the asn1 length from the current @p ptr.
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*
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* Internal function.
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*
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* @param ptr The current asn.1 object length pointer
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*
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* @return The length of the asn.1 object. @p ptr is updated to be after the length.
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*/
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size_t asn1_len(const uint8_t **ptr);
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/**
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* Get the asn1 tag from the current @p ptr.
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*
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* Internal function.
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*
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* @param ptr The current asn.1 object tag pointer
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* @param constructed 1 if current tag is constructed
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* @param cls The current class of the tag
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*
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* @return The tag value.@p ptr is updated to be after the tag.
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*/
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coap_asn1_tag_t asn1_tag_c(const uint8_t **ptr, int *constructed, int *cls);
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/**
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* Get the asn1 tag and data from the current @p ptr.
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*
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* Internal function.
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*
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* @param ltag The tag to look for
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* @param ptr The current asn.1 object pointer
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* @param tlen The remaining size oof the asn.1 data
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* @param validate Call validate to verify tag data or @c NULL
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*
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* @return The asn.1 tag and data (to be freed off by caller)
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* or @c NULL if not found
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*/
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coap_binary_t *get_asn1_tag(coap_asn1_tag_t ltag, const uint8_t *ptr,
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size_t tlen, asn1_validate validate);
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/**
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* Abstract SPKI public key from the ASN1.
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*
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* Internal function.
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*
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* @param data Pointer to ASN1 object containing EC Private Key
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* @param size Length of ASN1 object
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*
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* @return The publick key (to be freed off by caller)
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* or @c NULL if not found
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*/
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coap_binary_t *get_asn1_spki(const uint8_t *data, size_t size);
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/** @} */
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#endif /* COAP_ASN1_INTERNAL_H_ */
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