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1 //-----------------------------------------------------------------------------
2 // Authored by Craig Young <cyoung@tripwire.com> based on cmdlfhid.c structure
3 //
4 // cmdlfhid.c is Copyright (C) 2010 iZsh <izsh at fail0verflow.com>
5 //
6 // This code is licensed to you under the terms of the GNU GPL, version 2 or,
7 // at your option, any later version. See the LICENSE.txt file for the text of
8 // the license.
9 //-----------------------------------------------------------------------------
10 // Low frequency AWID26 commands
11 //-----------------------------------------------------------------------------
12
13 #include <stdio.h> // sscanf
14 #include "proxmark3.h" // Definitions, USB controls, etc
15 #include "ui.h" // PrintAndLog
16 #include "cmdparser.h" // CmdsParse, CmdsHelp
17 #include "cmdlfawid.h" // AWID function declarations
18 #include "lfdemod.h" // parityTest
19
20 static int CmdHelp(const char *Cmd);
21
22 int CmdAWIDDemodFSK(const char *Cmd)
23 {
24 int findone=0;
25 if(Cmd[0]=='1') findone=1;
26 UsbCommand c={CMD_AWID_DEMOD_FSK};
27 c.arg[0]=findone;
28 SendCommand(&c);
29 return 0;
30 }
31
32 int getAWIDBits(unsigned int fc, unsigned int cn, uint8_t *AWIDBits)
33 {
34 int i;
35 uint32_t fcode=(fc & 0x000000FF), cnum=(cn & 0x0000FFFF), uBits=0;
36 if (fcode != fc)
37 PrintAndLog("NOTE: Facility code truncated for AWID26 format (8-bit facility code)");
38 if (cnum!=cn)
39 PrintAndLog("NOTE: Card number was truncated for AWID26 format (16-bit card number)");
40
41 AWIDBits[0] = 0x01; // 6-bit Preamble with 2 parity bits
42 AWIDBits[1] = 0x1D; // First byte from card format (26-bit) plus parity bits
43 AWIDBits[2] = 0x80; // Set the next two bits as 0b10 to finish card format
44 uBits = (fcode<<4) + (cnum>>12);
45 if (!parityTest(uBits,12,0))
46 AWIDBits[2] |= (1<<5); // If not already even parity, set bit to make even
47 uBits = AWIDBits[2]>>5;
48 if (!parityTest(uBits, 3, 1))
49 AWIDBits[2] |= (1<<4);
50 uBits = fcode>>5; // first 3 bits of facility-code
51 AWIDBits[2] += (uBits<<1);
52 if (!parityTest(uBits, 3, 1))
53 AWIDBits[2]++; // Set parity bit to make odd parity
54 uBits = (fcode & 0x1C)>>2;
55 AWIDBits[3] = 0;
56 if (!parityTest(uBits,3,1))
57 AWIDBits[3] |= (1<<4);
58 AWIDBits[3] += (uBits<<5);
59 uBits = ((fcode & 0x3)<<1) + ((cnum & 0x8000)>>15); // Grab/shift 2 LSBs from facility code and add shifted MSB from cardnum
60 if (!parityTest(uBits,3,1))
61 AWIDBits[3]++; // Set LSB for parity
62 AWIDBits[3]+= (uBits<<1);
63 uBits = (cnum & 0x7000)>>12;
64 AWIDBits[4] = uBits<<5;
65 if (!parityTest(uBits,3,1))
66 AWIDBits[4] |= (1<<4);
67 uBits = (cnum & 0x0E00)>>9;
68 AWIDBits[4] += (uBits<<1);
69 if (!parityTest(uBits,3,1))
70 AWIDBits[4]++; // Set LSB for parity
71 uBits = (cnum & 0x1C0)>>6; // Next bits from card number
72 AWIDBits[5]=(uBits<<5);
73 if (!parityTest(uBits,3,1))
74 AWIDBits[5] |= (1<<4); // Set odd parity bit as needed
75 uBits = (cnum & 0x38)>>3;
76 AWIDBits[5]+= (uBits<<1);
77 if (!parityTest(uBits,3,1))
78 AWIDBits[5]++; // Set odd parity bit as needed
79 uBits = (cnum & 0x7); // Last three bits from card number!
80 AWIDBits[6] = (uBits<<5);
81 if (!parityTest(uBits,3,1))
82 AWIDBits[6] |= (1<<4);
83 uBits = (cnum & 0x0FFF);
84 if (!parityTest(uBits,12,1))
85 AWIDBits[6] |= (1<<3);
86 else
87 AWIDBits[6]++;
88 for (i = 7; i<12; i++)
89 AWIDBits[i]=0x11;
90 return 1;
91 }
92
93 int CmdAWIDSim(const char *Cmd)
94 {
95 uint32_t fcode = 0, cnum = 0, fc=0, cn=0, i=0;
96 uint8_t *BS, BitStream[12];
97 uint64_t arg1 = (10<<8) + 8; // fcHigh = 10, fcLow = 8
98 uint64_t arg2 = 50; // clk RF/50 invert=0
99 BS = BitStream;
100 if (sscanf(Cmd, "%u %u", &fc, &cn ) != 2) {
101 PrintAndLog("Usage: lf awid sim <facility-code> <card number>");
102 return 0;
103 }
104
105 fcode=(fc & 0x000000FF);
106 cnum=(cn & 0x0000FFFF);
107 if (fc!=fcode)
108 PrintAndLog("Facility-Code (%u) truncated to 8-bits: %u",fc,fcode);
109 if (cn!=cnum)
110 PrintAndLog("Card number (%u) truncated to 16-bits: %u",cn,cnum);
111 PrintAndLog("Emulating AWID26 -- FC: %u; CN: %u\n",fcode,cnum);
112 PrintAndLog("Press pm3-button to abort simulation or run another command");
113 // AWID uses: fcHigh: 10, fcLow: 8, clk: 50, invert: 0
114 if (getAWIDBits(fc, cn, BS)) {
115 PrintAndLog("Running 'lf simfsk c 50 H 10 L 8 d %02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x'",
116 BS[0],BS[1],BS[2],BS[3],BS[4],BS[5],BS[6],
117 BS[7],BS[8],BS[9],BS[10],BS[11]);
118 } else
119 PrintAndLog("Error with tag bitstream generation.");
120 UsbCommand c;
121 c.cmd = CMD_FSK_SIM_TAG;
122 c.arg[0] = arg1; // fcHigh<<8 + fcLow
123 c.arg[1] = arg2; // Inversion and clk setting
124 c.arg[2] = 96; // Bitstream length: 96-bits == 12 bytes
125 for (i=0; i < 96; i++)
126 c.d.asBytes[i] = (BS[i/8] & (1<<(7-(i%8))))?1:0;
127 SendCommand(&c);
128 return 0;
129 }
130
131 int CmdAWIDClone(const char *Cmd)
132 {
133 uint32_t fc=0,cn=0,blocks[4] = {0x00107060, 0, 0, 0x11111111}, i=0;
134 uint8_t BitStream[12];
135 uint8_t *BS=BitStream;
136 UsbCommand c;
137
138
139 if (sscanf(Cmd, "%u %u", &fc, &cn ) != 2) {
140 PrintAndLog("Usage: lf awid clone <facility-code> <card number>");
141 return 0;
142 }
143
144 if ((fc & 0xFF) != fc) {
145 fc &= 0xFF;
146 PrintAndLog("Facility-Code Truncated to 8-bits (AWID26): %u", fc);
147 }
148 if ((cn & 0xFFFF) != cn) {
149 cn &= 0xFFFF;
150 PrintAndLog("Card Number Truncated to 16-bits (AWID26): %u", cn);
151 }
152 if (getAWIDBits(fc,cn,BS)) {
153 PrintAndLog("Preparing to clone AWID26 to T55x7 with FC: %u, CN: %u (Raw: %02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x)",
154 fc,cn, BS[0],BS[1],BS[2],BS[3],BS[4],BS[5],BS[6],BS[7],BS[8],BS[9],BS[10],BS[11]);
155 blocks[1] = (BS[0]<<24) + (BS[1]<<16) + (BS[2]<<8) + (BS[3]);
156 blocks[2] = (BS[4]<<24) + (BS[5]<<16) + (BS[6]<<8) + (BS[7]);
157 PrintAndLog("Block 0: 0x%08x", blocks[0]);
158 PrintAndLog("Block 1: 0x%08x", blocks[1]);
159 PrintAndLog("Block 2: 0x%08x", blocks[2]);
160 PrintAndLog("Block 3: 0x%08x", blocks[3]);
161 for (i=0; i<4; i++) {
162 c.cmd = CMD_T55XX_WRITE_BLOCK;
163 c.arg[0] = blocks[i];
164 c.arg[1] = i;
165 c.arg[2] = 0;
166 SendCommand(&c);
167 }
168 }
169 return 0;
170 }
171
172 static command_t CommandTable[] =
173 {
174 {"help", CmdHelp, 1, "This help"},
175 {"fskdemod", CmdAWIDDemodFSK, 0, "['1'] Realtime AWID FSK demodulator (option '1' for one tag only)"},
176 {"sim", CmdAWIDSim, 0, "<Facility-Code> <Card Number> -- AWID tag simulator"},
177 {"clone", CmdAWIDClone, 0, "<Facility-Code> <Card Number> -- Clone AWID to T55x7 (tag must be in range of antenna)"},
178 {NULL, NULL, 0, NULL}
179 };
180
181 int CmdLFAWID(const char *Cmd)
182 {
183 CmdsParse(CommandTable, Cmd);
184 return 0;
185 }
186
187 int CmdHelp(const char *Cmd)
188 {
189 CmdsHelp(CommandTable);
190 return 0;
191 }
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