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
|
/*
* bac.c - Basic Access Control
*
* Copyright (C) 2014 Ruben Undheim <ruben.undheim@gmail.com>
*
* 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 <http://www.gnu.org/licenses/>.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <nfc/nfc.h>
#include "bachelper.h"
#include "bac.h"
static uint8_t rnd_ifd_int[8] = {0x78,0x17,0x23,0x86,0x0c,0x06,0xc2,0x26};
static uint8_t kifd_int[16] = {0x0b,0x79,0x52,0x40,0xcb,0x70,0x49,0xb0,0x1c,0x19,0xb3,0x3e,0x32,0x80,0x4f,0x0b};
int mrtd_bac_keyhandshake(nfc_device *pnd, const uint8_t *kmrz, uint8_t *ksenc, uint8_t *ksmac, uint64_t *ssc_long)
{
int i;
int res;
uint8_t txbuffer[300];
int txlen;
uint8_t rxbuffer[300];
int rxlen;
txlen = 12;
memcpy(txbuffer, "\x00\xa4\x04\x0c\x07\xa0\x00\x00\x02\x47\x10\x01", txlen);
rxlen = sizeof(rxbuffer);
if((res = nfc_initiator_transceive_bytes(pnd,txbuffer,txlen,rxbuffer,rxlen,500)) < 0){
fprintf(stderr,"Unable to send");
goto failed;
}
else{
rxlen = res;
}
txlen = 5;
memcpy(txbuffer, "\x00\x84\x00\x00\x08", txlen);
rxlen = sizeof(rxbuffer);
if((res = nfc_initiator_transceive_bytes(pnd,txbuffer,txlen,rxbuffer,rxlen,500)) < 0){
fprintf(stderr,"Unable to send");
goto failed;
}
else{
rxlen = res;
}
uint8_t remotechallenge[8];
memcpy(remotechallenge,rxbuffer,8);
uint8_t kenc[16];
uint8_t kmac[16];
mrtd_bac_kmrz_to_kenc_kmac(kmrz,kenc,kmac);
uint8_t cmd_data[40];
mrtd_bac_cmd_data(rnd_ifd_int,kifd_int,remotechallenge,kenc,kmac,cmd_data);
txlen = 46;
memcpy(txbuffer, "\x00\x82\x00\x00\x28", 5);
memcpy(txbuffer+5,cmd_data,40);
txbuffer[45] = 0x28;
rxlen = sizeof(rxbuffer);
if((res = nfc_initiator_transceive_bytes(pnd,txbuffer,txlen,rxbuffer,rxlen,100000)) < 0){
fprintf(stderr,"Unable to send");
goto failed;
}
else{
rxlen = res;
}
uint8_t rnd_icc[8];
uint8_t kicc[16];
if(mrtd_bac_challenge_ok(rxbuffer,kenc,rnd_ifd_int,rnd_icc,kicc)){
}
else {
goto challengefailed;
}
uint8_t xored[16];
for(i=0;i<16;i++){
xored[i] = kifd_int[i] ^ kicc[i];
}
mrtd_bac_kenc_kmac(xored,ksenc,ksmac);
//printhex("ksenc",ksenc,16);
//printhex("ksmac",ksmac,16);
(*ssc_long) = mrtd_bac_get_ssc(remotechallenge,rnd_ifd_int);
//printf("ssc: %lx\n",ssc_long);
return 0;
failed:
return -1;
challengefailed:
return RET_CHALLENGE_FAILED;
}
void mrtd_bac_set_rndifd_kifd(const uint8_t *rnd_ifd, const uint8_t *kifd)
{
int i;
int r = rand();
for(i=0;i<8;i++){
rnd_ifd_int[i] = rnd_ifd[i];
}
for(i=0;i<16;i++){
kifd_int[i] = kifd[i];
}
}
void mrtd_bac_randomize_rndifd_kifd()
{
int i,r;
for(i=0;i<8;i++){
r = rand();
rnd_ifd_int[i] = (uint8_t)(r & 0xff);
}
for(i=0;i<16;i++){
r = rand();
kifd_int[i] = (uint8_t)(r & 0xff);
}
}
|
