advertising_core.h

/*
 * Aliro BLE advertising primitives.
 *
 * Kept as portable C so the byte-order rules can be tested on the host using
 * the specification's published known-answer vectors.
 */
#pragma once
 
#include <stdint.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
enum {
        WOZ_ALIRO_BLE_ADDRESS_SIZE = 6,
        WOZ_ALIRO_DYNAMIC_TAG_INPUT_SIZE = 16,
        WOZ_ALIRO_DYNAMIC_TAG_SIZE = 7,
};
 
/* address_le uses Zephyr/bt_addr_t storage order. The generated AES input is
 * 6 zero pad bytes || AdvA most-significant-byte first || expiry big-endian. */
void woz_aliro_dynamic_tag_input(const uint8_t address_le[WOZ_ALIRO_BLE_ADDRESS_SIZE],
                                 uint32_t expiry_timestamp,
                                 uint8_t plaintext[WOZ_ALIRO_DYNAMIC_TAG_INPUT_SIZE]);
 
/* The dynamic tag is the seven most-significant AES ciphertext octets. */
void woz_aliro_dynamic_tag_from_ciphertext(
        const uint8_t ciphertext[WOZ_ALIRO_DYNAMIC_TAG_INPUT_SIZE],
        uint8_t tag[WOZ_ALIRO_DYNAMIC_TAG_SIZE]);
 
#ifdef __cplusplus
}
#endif