1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
|
/* Copyright (c) 2012, The Tor Project, Inc. */
/* See LICENSE for licensing information */
#include "orconfig.h"
#include <stdio.h>
#include <stdlib.h>
#define ONION_NTOR_PRIVATE
#include "or.h"
#include "util.h"
#include "compat.h"
#include "crypto.h"
#include "crypto_curve25519.h"
#include "onion_ntor.h"
#ifndef CURVE25519_ENABLED
#error "This isn't going to work without curve25519."
#endif
#define N_ARGS(n) STMT_BEGIN { \
if (argc < (n)) { \
fprintf(stderr, "%s needs %d arguments.\n",argv[1],n); \
return 1; \
} \
} STMT_END
#define BASE16(idx, var, n) STMT_BEGIN { \
const char *s = argv[(idx)]; \
if (base16_decode((char*)var, n, s, strlen(s)) < 0 ) { \
fprintf(stderr, "couldn't decode argument %d (%s)\n",idx,s); \
return 1; \
} \
} STMT_END
#define INT(idx, var) STMT_BEGIN { \
var = atoi(argv[(idx)]); \
if (var <= 0) { \
fprintf(stderr, "bad integer argument %d (%s)\n",idx,argv[(idx)]); \
} \
} STMT_END
static int
client1(int argc, char **argv)
{
/* client1 nodeID B -> msg state */
curve25519_public_key_t B;
uint8_t node_id[DIGEST_LEN];
ntor_handshake_state_t *state;
uint8_t msg[NTOR_ONIONSKIN_LEN];
char buf[1024];
memset(&state, 0, sizeof(state));
N_ARGS(4);
BASE16(2, node_id, DIGEST_LEN);
BASE16(3, B.public_key, CURVE25519_PUBKEY_LEN);
if (onion_skin_ntor_create(node_id, &B, &state, msg)<0) {
fprintf(stderr, "handshake failed");
return 2;
}
base16_encode(buf, sizeof(buf), (const char*)msg, sizeof(msg));
printf("%s\n", buf);
base16_encode(buf, sizeof(buf), (void*)state, sizeof(*state));
printf("%s\n", buf);
ntor_handshake_state_free(state);
return 0;
}
static int
server1(int argc, char **argv)
{
uint8_t msg_in[NTOR_ONIONSKIN_LEN];
curve25519_keypair_t kp;
di_digest256_map_t *keymap=NULL;
uint8_t node_id[DIGEST_LEN];
int keybytes;
uint8_t msg_out[NTOR_REPLY_LEN];
uint8_t *keys;
char *hexkeys;
char buf[256];
/* server1: b nodeID msg N -> msg keys */
N_ARGS(6);
BASE16(2, kp.seckey.secret_key, CURVE25519_SECKEY_LEN);
BASE16(3, node_id, DIGEST_LEN);
BASE16(4, msg_in, NTOR_ONIONSKIN_LEN);
INT(5, keybytes);
curve25519_public_key_generate(&kp.pubkey, &kp.seckey);
dimap_add_entry(&keymap, kp.pubkey.public_key, &kp);
keys = tor_malloc(keybytes);
hexkeys = tor_malloc(keybytes*2+1);
if (onion_skin_ntor_server_handshake(
msg_in, keymap, NULL, node_id, msg_out, keys,
(size_t)keybytes)<0) {
fprintf(stderr, "handshake failed");
return 2;
}
base16_encode(buf, sizeof(buf), (const char*)msg_out, sizeof(msg_out));
printf("%s\n", buf);
base16_encode(hexkeys, keybytes*2+1, (const char*)keys, keybytes);
printf("%s\n", hexkeys);
tor_free(keys);
tor_free(hexkeys);
return 0;
}
static int
client2(int argc, char **argv)
{
struct ntor_handshake_state_t state;
uint8_t msg[NTOR_REPLY_LEN];
int keybytes;
uint8_t *keys;
char *hexkeys;
N_ARGS(5);
BASE16(2, (&state), sizeof(state));
BASE16(3, msg, sizeof(msg));
INT(4, keybytes);
keys = tor_malloc(keybytes);
hexkeys = tor_malloc(keybytes*2+1);
if (onion_skin_ntor_client_handshake(&state, msg, keys, keybytes)<0) {
fprintf(stderr, "handshake failed");
return 2;
}
base16_encode(hexkeys, keybytes*2+1, (const char*)keys, keybytes);
printf("%s\n", hexkeys);
tor_free(keys);
tor_free(hexkeys);
return 0;
}
int
main(int argc, char **argv)
{
/*
client1: nodeID B -> msg state
server1: b nodeID msg N -> msg keys
client2: state msg N -> keys
*/
if (argc < 2) {
fprintf(stderr, "I need arguments. Read source for more info.\n");
return 1;
} else if (!strcmp(argv[1], "client1")) {
return client1(argc, argv);
} else if (!strcmp(argv[1], "server1")) {
return server1(argc, argv);
} else if (!strcmp(argv[1], "client2")) {
return client2(argc, argv);
} else {
fprintf(stderr, "What's a %s?\n", argv[1]);
return 1;
}
}
|