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/*
chronyd/chronyc - Programs for keeping computer clocks accurate.
**********************************************************************
* Copyright (C) Miroslav Lichvar 2020
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* 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, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
**********************************************************************
=======================================================================
Header file for the NTS Key Establishment protocol
*/
#ifndef GOT_NTS_KE_H
#define GOT_NTS_KE_H
#include "siv.h"
#define NKE_PORT 4460
#define NKE_RECORD_CRITICAL_BIT (1U << 15)
#define NKE_RECORD_END_OF_MESSAGE 0
#define NKE_RECORD_NEXT_PROTOCOL 1
#define NKE_RECORD_ERROR 2
#define NKE_RECORD_WARNING 3
#define NKE_RECORD_AEAD_ALGORITHM 4
#define NKE_RECORD_COOKIE 5
#define NKE_RECORD_NTPV4_SERVER_NEGOTIATION 6
#define NKE_RECORD_NTPV4_PORT_NEGOTIATION 7
#define NKE_NEXT_PROTOCOL_NTPV4 0
#define NKE_ERROR_UNRECOGNIZED_CRITICAL_RECORD 0
#define NKE_ERROR_BAD_REQUEST 1
#define NKE_ERROR_INTERNAL_SERVER_ERROR 2
#define NKE_ALPN_NAME "ntske/1"
#define NKE_EXPORTER_LABEL "EXPORTER-network-time-security"
#define NKE_EXPORTER_CONTEXT_C2S "\x0\x0\x0\xf\x0"
#define NKE_EXPORTER_CONTEXT_S2C "\x0\x0\x0\xf\x1"
#define NKE_MAX_MESSAGE_LENGTH 16384
#define NKE_MAX_RECORD_BODY_LENGTH 256
#define NKE_MAX_COOKIE_LENGTH 256
#define NKE_MAX_COOKIES 8
#define NKE_MAX_KEY_LENGTH SIV_MAX_KEY_LENGTH
#define NKE_RETRY_FACTOR2_CONNECT 4
#define NKE_RETRY_FACTOR2_TLS 10
#define NKE_MAX_RETRY_INTERVAL2 19
typedef struct {
int length;
unsigned char key[NKE_MAX_KEY_LENGTH];
} NKE_Key;
typedef struct {
SIV_Algorithm algorithm;
NKE_Key c2s;
NKE_Key s2c;
} NKE_Context;
typedef struct {
int length;
unsigned char cookie[NKE_MAX_COOKIE_LENGTH];
} NKE_Cookie;
#endif
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