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add first attempt at lf miller decoding
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1 //-----------------------------------------------------------------------------
2 //
3 // This code is licensed to you under the terms of the GNU GPL, version 2 or,
4 // at your option, any later version. See the LICENSE.txt file for the text of
5 // the license.
6 //-----------------------------------------------------------------------------
7 // Low frequency Farpoint / Pyramid tag commands
8 //-----------------------------------------------------------------------------
9 #include <string.h>
10 #include <inttypes.h>
11 #include "cmdlfpyramid.h"
12 #include "proxmark3.h"
13 #include "ui.h"
14 #include "util.h"
15 #include "graph.h"
16 #include "cmdparser.h"
17 #include "cmddata.h"
18 #include "cmdmain.h"
19 #include "cmdlf.h"
20 #include "protocols.h" // for T55xx config register definitions
21 #include "lfdemod.h" // parityTest
22 #include "crc.h"
23
24 static int CmdHelp(const char *Cmd);
25
26 int usage_lf_pyramid_clone(void){
27 PrintAndLog("clone a Farpointe/Pyramid tag to a T55x7 tag.");
28 PrintAndLog("The facility-code is 8-bit and the card number is 16-bit. Larger values are truncated. ");
29 PrintAndLog("Currently work only on 26bit");
30 PrintAndLog("");
31 PrintAndLog("Usage: lf pyramid clone <Facility-Code> <Card-Number>");
32 PrintAndLog("Options :");
33 PrintAndLog(" <Facility-Code> : 8-bit value facility code");
34 PrintAndLog(" <Card Number> : 16-bit value card number");
35 PrintAndLog(" Q5 : optional - clone to Q5 (T5555) instead of T55x7 chip");
36 PrintAndLog("");
37 PrintAndLog("Sample : lf pyramid clone 123 11223");
38 return 0;
39 }
40
41 int usage_lf_pyramid_sim(void) {
42 PrintAndLog("Enables simulation of Farpointe/Pyramid card with specified card number.");
43 PrintAndLog("Simulation runs until the button is pressed or another USB command is issued.");
44 PrintAndLog("The facility-code is 8-bit and the card number is 16-bit. Larger values are truncated.");
45 PrintAndLog("Currently work only on 26bit");
46 PrintAndLog("");
47 PrintAndLog("Usage: lf pyramid sim <Card-Number>");
48 PrintAndLog("Options :");
49 PrintAndLog(" <Facility-Code> : 8-bit value facility code");
50 PrintAndLog(" <Card Number> : 16-bit value card number");
51 PrintAndLog("");
52 PrintAndLog("Sample : lf pyramid sim 123 11223");
53 return 0;
54 }
55
56 // Works for 26bits.
57 int GetPyramidBits(uint32_t fc, uint32_t cn, uint8_t *pyramidBits) {
58
59 uint8_t pre[128];
60 memset(pre, 0x00, sizeof(pre));
61
62 // format start bit
63 pre[79] = 1;
64
65 // Get 26 wiegand from FacilityCode, CardNumber
66 uint8_t wiegand[24];
67 memset(wiegand, 0x00, sizeof(wiegand));
68 num_to_bytebits(fc, 8, wiegand);
69 num_to_bytebits(cn, 16, wiegand+8);
70
71 // add wiegand parity bits (dest, source, len)
72 wiegand_add_parity(pre+80, wiegand, 24);
73
74 // add paritybits (bitsource, dest, sourcelen, paritylen, parityType (odd, even,)
75 addParity(pre+8, pyramidBits+8, 102, 8, 1);
76
77 // add checksum
78 uint8_t csBuff[13];
79 for (uint8_t i = 0; i < 13; i++)
80 csBuff[i] = bytebits_to_byte(pyramidBits + 16 + (i*8), 8);
81
82 uint32_t crc = CRC8Maxim(csBuff, 13);
83 num_to_bytebits(crc, 8, pyramidBits+120);
84 return 1;
85 }
86
87 int CmdPyramidRead(const char *Cmd) {
88 CmdLFRead("s");
89 getSamples("30000",false);
90 return CmdFSKdemodPyramid("");
91 }
92
93 int CmdPyramidClone(const char *Cmd) {
94
95 char cmdp = param_getchar(Cmd, 0);
96 if (strlen(Cmd) == 0 || cmdp == 'h' || cmdp == 'H') return usage_lf_pyramid_clone();
97
98 uint32_t facilitycode=0, cardnumber=0, fc = 0, cn = 0;
99 uint32_t blocks[5];
100 uint8_t i;
101 uint8_t bs[128];
102 memset(bs, 0x00, sizeof(bs));
103
104 if (sscanf(Cmd, "%u %u", &fc, &cn ) != 2) return usage_lf_pyramid_clone();
105
106 facilitycode = (fc & 0x000000FF);
107 cardnumber = (cn & 0x0000FFFF);
108
109 if ( !GetPyramidBits(facilitycode, cardnumber, bs)) {
110 PrintAndLog("Error with tag bitstream generation.");
111 return 1;
112 }
113
114 //Pyramid - compat mode, FSK2a, data rate 50, 4 data blocks
115 blocks[0] = T55x7_MODULATION_FSK2a | T55x7_BITRATE_RF_50 | 4<<T55x7_MAXBLOCK_SHIFT;
116
117 if (param_getchar(Cmd, 3) == 'Q' || param_getchar(Cmd, 3) == 'q')
118 blocks[0] = T5555_MODULATION_FSK2 | T5555_INVERT_OUTPUT | 50<<T5555_BITRATE_SHIFT | 4<<T5555_MAXBLOCK_SHIFT;
119
120 blocks[1] = bytebits_to_byte(bs,32);
121 blocks[2] = bytebits_to_byte(bs+32,32);
122 blocks[3] = bytebits_to_byte(bs+64,32);
123 blocks[4] = bytebits_to_byte(bs+96,32);
124
125 PrintAndLog("Preparing to clone Farpointe/Pyramid to T55x7 with Facility Code: %u, Card Number: %u", facilitycode, cardnumber);
126 PrintAndLog("Blk | Data ");
127 PrintAndLog("----+------------");
128 for ( i = 0; i<5; ++i )
129 PrintAndLog(" %02d | %08" PRIx32, i, blocks[i]);
130
131 UsbCommand resp;
132 UsbCommand c = {CMD_T55XX_WRITE_BLOCK, {0,0,0}};
133
134 for ( i = 0; i<5; ++i ) {
135 c.arg[0] = blocks[i];
136 c.arg[1] = i;
137 clearCommandBuffer();
138 SendCommand(&c);
139 if (!WaitForResponseTimeout(CMD_ACK, &resp, 1000)){
140 PrintAndLog("Error occurred, device did not respond during write operation.");
141 return -1;
142 }
143 }
144 return 0;
145 }
146
147 int CmdPyramidSim(const char *Cmd) {
148
149 char cmdp = param_getchar(Cmd, 0);
150 if (strlen(Cmd) == 0 || cmdp == 'h' || cmdp == 'H') return usage_lf_pyramid_sim();
151
152 uint32_t facilitycode = 0, cardnumber = 0, fc = 0, cn = 0;
153
154 uint8_t bs[128];
155 size_t size = sizeof(bs);
156 memset(bs, 0x00, size);
157
158 // Pyramid uses: fcHigh: 10, fcLow: 8, clk: 50, invert: 0
159 uint64_t arg1, arg2;
160 arg1 = (10 << 8) + 8;
161 arg2 = 50 | 0;
162
163 if (sscanf(Cmd, "%u %u", &fc, &cn ) != 2) return usage_lf_pyramid_sim();
164
165 facilitycode = (fc & 0x000000FF);
166 cardnumber = (cn & 0x0000FFFF);
167
168 if ( !GetPyramidBits(facilitycode, cardnumber, bs)) {
169 PrintAndLog("Error with tag bitstream generation.");
170 return 1;
171 }
172
173 PrintAndLog("Simulating Farpointe/Pyramid - Facility Code: %u, CardNumber: %u", facilitycode, cardnumber );
174
175 UsbCommand c = {CMD_FSK_SIM_TAG, {arg1, arg2, size}};
176 memcpy(c.d.asBytes, bs, size);
177 clearCommandBuffer();
178 SendCommand(&c);
179 return 0;
180 }
181
182 static command_t CommandTable[] = {
183 {"help", CmdHelp, 1, "This help"},
184 {"read", CmdPyramidRead, 0, "Attempt to read and extract tag data"},
185 {"clone", CmdPyramidClone, 0, "<Facility-Code> <Card Number> clone pyramid tag"},
186 {"sim", CmdPyramidSim, 0, "<Facility-Code> <Card Number> simulate pyramid tag"},
187 {NULL, NULL, 0, NULL}
188 };
189
190 int CmdLFPyramid(const char *Cmd) {
191 clearCommandBuffer();
192 CmdsParse(CommandTable, Cmd);
193 return 0;
194 }
195
196 int CmdHelp(const char *Cmd) {
197 CmdsHelp(CommandTable);
198 return 0;
199 }
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