asn1_decode.h

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/*
 * Copyright (c) 2024 Nordic Semiconductor ASA
 *
 * SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
 */
 
/* A minimalistic ASN.1 BER/DER decoder (X.690).
 *
 * Supported types:
 *   OCTET STRING
 *   SEQUENCE / SEQUENCE OF
 */
 
#ifndef ASN1_DECODE_H_
#define ASN1_DECODE_H_
 
#include <stdlib.h>
#include <stdint.h>
#include <stdbool.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
#define UP4  0x04
#define UP6  0x06
#define UC16 0x30
#define AP15 0x4F
#define AP16 0x50
#define CC1  0xA1
#define CC7  0xA7
 
typedef struct {
        const uint8_t *asnbuf;  
        size_t length;          
        uint32_t offset;        
        bool error;             
} asn1_ctx_t;
 
typedef void (*asn1_sequence_func_t)(asn1_ctx_t *ctx, void *data);
 
bool asn1_dec_head(asn1_ctx_t *ctx, uint8_t *tag, size_t *len);
 
void asn1_dec_octet_string(asn1_ctx_t *ctx, size_t len, uint8_t *value, size_t max_len);
 
void asn1_dec_sequence(asn1_ctx_t *ctx, size_t len, void *data, asn1_sequence_func_t sequence_func);
 
void asn1_dec_skip(asn1_ctx_t *ctx, size_t len);
 
#ifdef __cplusplus
}
#endif
 
#endif /* ASN1_DECODE_H_ */