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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