5 sptps.h -- Simple Peer-to-Peer Security
6 Copyright (C) 2011-2014 Guus Sliepen <guus@tinc-vpn.org>
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License along
19 with this program; if not, write to the Free Software Foundation, Inc.,
20 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
25 #include "chacha-poly1305/chacha-poly1305.h"
29 #define SPTPS_VERSION 0
32 #define SPTPS_HANDSHAKE 128 // Key exchange and authentication
33 #define SPTPS_ALERT 129 // Warning or error messages
34 #define SPTPS_CLOSE 130 // Application closed the connection
36 // Key exchange states
37 #define SPTPS_KEX 1 // Waiting for the first Key EXchange record
38 #define SPTPS_SECONDARY_KEX 2 // Ready to receive a secondary Key EXchange record
39 #define SPTPS_SIG 3 // Waiting for a SIGnature record
40 #define SPTPS_ACK 4 // Waiting for an ACKnowledgement record
42 // Overhead for datagrams
43 #define SPTPS_DATAGRAM_OVERHEAD 21
45 typedef bool (*send_data_t)(void *handle, uint8_t type, const void *data, size_t len);
46 typedef bool (*receive_record_t)(void *handle, uint8_t type, const void *data, uint16_t len);
48 typedef struct sptps {
58 chacha_poly1305_ctx_t *incipher;
61 unsigned int replaywin;
62 unsigned int farfuture;
66 chacha_poly1305_ctx_t *outcipher;
80 send_data_t send_data;
81 receive_record_t receive_record;
84 extern unsigned int sptps_replaywin;
85 extern void sptps_log_quiet(sptps_t *s, int s_errno, const char *format, va_list ap);
86 extern void sptps_log_stderr(sptps_t *s, int s_errno, const char *format, va_list ap);
87 extern void (*sptps_log)(sptps_t *s, int s_errno, const char *format, va_list ap);
88 extern bool sptps_start(sptps_t *s, void *handle, bool initiator, bool datagram, ecdsa_t *mykey, ecdsa_t *hiskey, const void *label, size_t labellen, send_data_t send_data, receive_record_t receive_record);
89 extern bool sptps_stop(sptps_t *s);
90 extern bool sptps_send_record(sptps_t *s, uint8_t type, const void *data, uint16_t len);
91 extern size_t sptps_receive_data(sptps_t *s, const void *data, size_t len);
92 extern bool sptps_force_kex(sptps_t *s);
93 extern bool sptps_verify_datagram(sptps_t *s, const void *data, size_t len);