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trezor-firmware/crypto/der.h

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/**
* Copyright (c) 2023 Trezor Company s.r.o.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT HMAC_SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES
* OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef __DER_H
#define __DER_H
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include "buffer.h"
#include "options.h"
#define DER_SEQUENCE 0x30
#define DER_INTEGER 0x02
#define DER_BIT_STRING 0x03
#define DER_OCTET_STRING 0x04
// Struct representing a DER-encoded ASN.1 data value.
typedef struct {
// Single-octet identifier encoding the ASN.1 class, type and tag number.
uint8_t id;
// A buffer containing the entire DER encoding of the data value including the
// tag and length, but with the position indicator initialized to the offset
// of the contents octets.
BUFFER_READER buf;
} DER_ITEM;
bool __wur der_read_length(BUFFER_READER *buf, size_t *len);
bool __wur der_write_length(BUFFER_WRITER *buf, size_t len);
bool __wur der_read_item(BUFFER_READER *buf, DER_ITEM *item);
bool __wur der_reencode_int(BUFFER_READER *reader, BUFFER_WRITER *writer);
#endif // __DER_H