psa_crypto_cbor_encoder.h

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/*
 * Copyright (C) 2023 HAW Hamburg
 *
 * This file is subject to the terms and conditions of the GNU Lesser
 * General Public License v2.1. See the file LICENSE in the top level
 * directory for more details.
 */
 
#pragma once

 
#ifdef __cplusplus
extern "C" {
#endif
 
#include "psa_crypto_slot_management.h"

#define CBOR_BUF_SIZE_START         (   1 + /* Array encoding */ \
                                        1 + /* Array encoding */ \
                                        1 + sizeof(psa_key_id_t) + \
                                        1 + sizeof(psa_key_type_t) + \
                                        1 + sizeof(psa_key_bits_t) + \
                                        1 + sizeof(psa_key_lifetime_t) + \
                                        1 + /* Array encoding */ \
                                        1 + sizeof(psa_key_usage_t) + \
                                        1 + sizeof(psa_algorithm_t) \
                                    )
 
#if PSA_SINGLE_KEY_COUNT
#define CBOR_BUF_SIZE_SINGLE_KEY    (   CBOR_BUF_SIZE_START + \
                                        3 + /* Bytestring encoding and size */ \
                                        PSA_MAX_KEY_DATA_SIZE \
                                    )
#endif /* PSA_SINGLE_KEY_COUNT */
 
#if PSA_ASYMMETRIC_KEYPAIR_COUNT
#define CBOR_BUF_SIZE_KEY_PAIR      (   CBOR_BUF_SIZE_START + \
                                        1 + \
                                        3 + PSA_BITS_TO_BYTES(PSA_MAX_PRIV_KEY_SIZE) + \
                                        3 + PSA_EXPORT_PUBLIC_KEY_MAX_SIZE \
                                    )
#endif /* PSA_ASYMMETRIC_KEYPAIR_COUNT */
 
#if PSA_PROTECTED_KEY_COUNT && IS_USED(MODULE_PSA_ASYMMETRIC)
#define CBOR_BUF_SIZE_PROT_KEY      (   CBOR_BUF_SIZE_START + \
                                        1 + \
                                        1 + sizeof(psa_key_slot_number_t) + \
                                        3 + PSA_EXPORT_PUBLIC_KEY_MAX_SIZE \
                                    )
#elif PSA_PROTECTED_KEY_COUNT
#define CBOR_BUF_SIZE_PROT_KEY      (   CBOR_BUF_SIZE_START + \
                                        1 + \
                                        1 + sizeof(psa_key_slot_number_t) \
                                    )
#endif /* PSA_PROTECTED_KEY_COUNT */

psa_status_t psa_encode_key_slot(psa_key_slot_t *slot, uint8_t *output,
                                     size_t output_len, size_t *output_size);

psa_status_t psa_decode_key_slot_data(psa_key_slot_t *slot, uint8_t *cbor_buf,
                                      size_t cbor_buf_size);

psa_status_t psa_decode_key_attributes(psa_key_attributes_t *attr, uint8_t *cbor_buf,
                                       size_t cbor_buf_size);
 
#ifdef __cplusplus
}
#endif