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/* Copyright (C) 2015 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#pragma once
#include <stdint.h>
#include "libknot/packet/pkt.h"
#include "libknot/tsig.h"
#define TSIG_MAX_DIGEST_SIZE 64
/*!
\brief TSIG context.
*/
typedef struct tsig_ctx {
const knot_tsig_key_t *key;
uint64_t prev_signed_time;
uint8_t digest[TSIG_MAX_DIGEST_SIZE];
size_t digest_size;
/* Unsigned packets handling. */
unsigned unsigned_count;
uint8_t *buffer;
size_t buffer_used;
size_t buffer_size;
} tsig_ctx_t;
/*!
* \brief Initialize TSIG context.
*
* \param ctx TSIG context to be initialized.
* \param key Key to be used for signing. If NULL, all performed operations
* will do nothing and always successful.
*/
void tsig_init(tsig_ctx_t *ctx, const knot_tsig_key_t *key);
/*!
* \brief Cleanup TSIG context.
*
* \param ctx TSIG context to be cleaned up.
*/
void tsig_cleanup(tsig_ctx_t *ctx);
/*!
* \brief Reset TSIG context for new message exchange.
*/
void tsig_reset(tsig_ctx_t *ctx);
/*!
* \brief Sign outgoing packet.
*
* \param ctx TSIG signing context.
* \param packet Packet to be signed.
*
* \return Error code, KNOT_EOK if successful.
*/
int tsig_sign_packet(tsig_ctx_t *ctx, knot_pkt_t *packet);
/*!
* \brief Verify incoming packet.
*
* If the packet is not signed, the function will succeed, but an internal
* counter of unsigned packets is increased. When a packet is signed, the
* same counter is reset to zero.
*
* \see tsig_unsigned_count
*
* \param ctx TSIG signing context.
* \param packet Packet to be verified.
*
* \return Error code, KNOT_EOK if successful.
*/
int tsig_verify_packet(tsig_ctx_t *ctx, knot_pkt_t *packet);
/*!
* \brief Get number of unsigned packets since the last signed one.
*
* \param ctx TSIG signing context.
*
* \return Number of unsigned packets since the last signed one.
*/
unsigned tsig_unsigned_count(tsig_ctx_t *ctx);
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