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/*
* Ouroboros - Copyright (C) 2016 - 2026
*
* Data-plane key-rotation schedule (node/leaf keys, selector)
*
* Dimitri Staessens <dimitri@ouroboros.rocks>
* Sander Vrijders <sander@ouroboros.rocks>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* version 2.1 as published by the Free Software Foundation.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., http://www.fsf.org/about/contact/.
*/
#ifndef OUROBOROS_LIB_CRYPT_KEYROT_H
#define OUROBOROS_LIB_CRYPT_KEYROT_H
#include <ouroboros/crypt.h> /* SYMMKEYSZ, NONCESZ */
#include <stdbool.h>
#include <stdint.h>
#define KR_SELECTOR_LEN 6
#define KR_NONCE_LEN NONCESZ
struct keyrot;
struct kr_rx {
uint64_t id; /* batch id of the matched epoch */
uint64_t ctr; /* packet counter for replay check */
};
struct keyrot * keyrot_create(const uint8_t * root,
uint8_t epoch,
uint8_t role);
void keyrot_destroy(struct keyrot * kr);
int keyrot_rekey(struct keyrot * kr,
const uint8_t * root,
uint8_t epoch);
/* Promote TX to the installed (new) batch once the peer is on it. */
void keyrot_tx_promote(struct keyrot * kr);
int keyrot_tx_next(struct keyrot * kr,
uint8_t sel[KR_SELECTOR_LEN],
const uint8_t ** key,
uint8_t nonce[KR_NONCE_LEN]);
int keyrot_rx_lookup(struct keyrot * kr,
const uint8_t sel[KR_SELECTOR_LEN],
const uint8_t ** key,
uint8_t nonce[KR_NONCE_LEN],
struct kr_rx * rx);
/* Commit an authenticated packet: replay window + peer-switched. */
int keyrot_rx_commit(struct keyrot * kr,
const struct kr_rx * rx);
/* True once an RX packet under the current batch has been observed. */
bool keyrot_peer_switched(const struct keyrot * kr);
unsigned keyrot_tx_nodes_left(struct keyrot * kr);
#endif /* OUROBOROS_LIB_CRYPT_KEYROT_H */
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