ctap_mem.h

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/*
 * Copyright (C) 2021 Freie Universität Berlin
 *
 * 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

 
#include <stdint.h>
 
#include "fido2/ctap/ctap.h"
#include "periph/flashpage.h"
 
#ifdef __cplusplus
extern "C" {
#endif

#ifndef _MAX
#define _MAX(a, b) ((a) > (b) ? (a) : (b))
#endif

#ifndef CONFIG_FIDO2_CTAP_NUM_FLASHPAGES
#define CONFIG_FIDO2_CTAP_NUM_FLASHPAGES 4
#endif
 
#if CONFIG_FIDO2_CTAP_NUM_FLASHPAGES < 2
#error "ctap_mem.h: Configured number of flashpages is invalid"
#endif

#define CTAP_FLASH_ALIGN_PAD(x) (sizeof(x) % FLASHPAGE_WRITE_BLOCK_SIZE == \
                                 0 ? \
                                 0 : FLASHPAGE_WRITE_BLOCK_SIZE - \
                                 sizeof(x) % FLASHPAGE_WRITE_BLOCK_SIZE)

#define CTAP_FLASH_RK_SZ (sizeof(ctap_resident_key_t) + \
                          CTAP_FLASH_ALIGN_PAD(ctap_resident_key_t))

#define CTAP_FLASH_STATE_SZ (sizeof(ctap_state_t) + \
                             CTAP_FLASH_ALIGN_PAD(ctap_state_t))

#define CTAP_FLASH_MAX_NUM_RKS ((CONFIG_FIDO2_CTAP_NUM_FLASHPAGES - 1) * \
                                FLASHPAGE_SIZE / CTAP_FLASH_RK_SZ)

#define CTAP_FLASH_MIN_SECTOR_SZ _MAX(CTAP_FLASH_STATE_SZ, CTAP_FLASH_RK_SZ)

#define CTAP_FLASH_PAGES_PER_SECTOR ((CTAP_FLASH_MIN_SECTOR_SZ / FLASHPAGE_SIZE) + 1)

#define CTAP_FLASH_RK_OFF 0x1

ctap_status_code_t fido2_ctap_mem_init(void);

ctap_status_code_t fido2_ctap_mem_read(void *buf, uint32_t page, uint32_t offset, uint32_t len);

ctap_status_code_t fido2_ctap_mem_erase_flash(void);

ctap_status_code_t fido2_ctap_mem_read_state_from_flash(ctap_state_t *state);

ctap_status_code_t fido2_ctap_mem_write_state_to_flash(ctap_state_t *state);

ctap_status_code_t fido2_ctap_mem_read_rk_from_flash(ctap_resident_key_t *key, uint8_t *rp_id_hash,
                                                     uint32_t *addr);

ctap_status_code_t fido2_ctap_mem_write_rk_to_flash(ctap_resident_key_t *rk);
 
#ifdef __cplusplus
}
#endif