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FIX: lf hitag : Mea culpa, simulation should not have reader_field on. thanks to...
[proxmark3-svn] / armsrc / mifaresniff.c
1 //-----------------------------------------------------------------------------
2 // Merlok - 2012
3 //
4 // This code is licensed to you under the terms of the GNU GPL, version 2 or,
5 // at your option, any later version. See the LICENSE.txt file for the text of
6 // the license.
7 //-----------------------------------------------------------------------------
8 // Routines to support mifare classic sniffer.
9 //-----------------------------------------------------------------------------
10
11 #include "mifaresniff.h"
12
13 static int sniffState = SNF_INIT;
14 static uint8_t sniffUIDType = 0;
15 static uint8_t sniffUID[10] = {0,0,0,0,0,0,0,0,0,0};
16 static uint8_t sniffATQA[2] = {0,0};
17 static uint8_t sniffSAK = 0;
18 static uint8_t sniffBuf[17];
19 static uint32_t timerData = 0;
20
21 void MfSniffInit(void){
22 memset(sniffUID, 0x00, sizeof(sniffUID));
23 memset(sniffATQA, 0x00, sizeof(sniffATQA));
24 memset(sniffBuf, 0x00, sizeof(sniffBuf));
25 sniffSAK = 0;
26 sniffUIDType = SNF_UID_4;
27 }
28
29 void MfSniffEnd(void){
30 LED_B_ON();
31 cmd_send(CMD_ACK,0,0,0,0,0);
32 LED_B_OFF();
33 }
34
35 bool RAMFUNC MfSniffLogic(const uint8_t *data, uint16_t len, uint8_t *parity, uint16_t bitCnt, bool reader) {
36
37 // reset on 7-Bit commands from reader
38 if (reader && (len == 1) && (bitCnt == 7)) {
39 sniffState = SNF_INIT;
40 }
41
42 switch (sniffState) {
43 case SNF_INIT:{
44 // REQA or WUPA from reader
45 if ((len == 1) && (reader) && (bitCnt == 7) ) {
46 MfSniffInit();
47 sniffState = SNF_WUPREQ;
48 }
49 break;
50 }
51 case SNF_WUPREQ:{
52 // ATQA from tag
53 if ((!reader) && (len == 2)) {
54 sniffATQA[0] = data[0];
55 sniffATQA[1] = data[1];
56 sniffState = SNF_ATQA;
57 }
58 break;
59 }
60 case SNF_ATQA:{
61 // Select ALL from reader
62 if ((reader) && (len == 2) && (data[0] == 0x93) && (data[1] == 0x20))
63 sniffState = SNF_ANTICOL1;
64 break;
65 }
66 case SNF_ANTICOL1:{
67 // UID from tag (CL1)
68 if ((!reader) && (len == 5) && ((data[0] ^ data[1] ^ data[2] ^ data[3]) == data[4])) {
69 memcpy(sniffUID, data, 4);
70 sniffState = SNF_UID1;
71 }
72 break;
73 }
74 case SNF_UID1:{
75 // Select 4 Byte UID from reader
76 if ((reader) && (len == 9) && (data[0] == 0x93) && (data[1] == 0x70) && (CheckCrc14443(CRC_14443_A, data, 9)))
77 sniffState = SNF_SAK;
78 break;
79 }
80 case SNF_SAK:{
81 if ((!reader) && (len == 3) && (CheckCrc14443(CRC_14443_A, data, 3))) { // SAK from card?
82 sniffSAK = data[0];
83 if (sniffUID[0] == 0x88) // CL2/3 UID part to be expected
84 sniffState = (sniffState == SNF_ANTICOL2 ) ? SNF_ANTICOL3 : SNF_ANTICOL2;
85 else // select completed
86 sniffState = SNF_CARD_IDLE;
87 }
88 break;
89 }
90 case SNF_ANTICOL2:{
91 // CL2 UID
92 if ((!reader) && (len == 5) && ((data[0] ^ data[1] ^ data[2] ^ data[3]) == data[4])) {
93 sniffUID[0] = sniffUID[1];
94 sniffUID[1] = sniffUID[2];
95 sniffUID[2] = sniffUID[3];
96 memcpy(sniffUID+3, data, 4);
97 sniffUIDType = SNF_UID_7;
98 sniffState = SNF_UID2;
99 }
100 break;
101 }
102 case SNF_UID2:{
103 // Select 2nd part of 7 Byte UID
104 if ((reader) && (len == 9) && (data[0] == 0x95) && (data[1] == 0x70) && (CheckCrc14443(CRC_14443_A, data, 9)))
105 sniffState = SNF_SAK;
106 break;
107 }
108 case SNF_ANTICOL3:{
109 // CL3 UID
110 if ((!reader) && (len == 5) && ((data[0] ^ data[1] ^ data[2] ^ data[3]) == data[4])) {
111 // 3+3+4 = 10.
112 sniffUID[3] = sniffUID[4];
113 sniffUID[4] = sniffUID[5];
114 sniffUID[5] = sniffUID[6];
115 memcpy(sniffUID+6, data, 4);
116 sniffUIDType = SNF_UID_10;
117 sniffState = SNF_UID3;
118 }
119 break;
120 }
121 case SNF_UID3:{
122 // Select 3nd part of 10 Byte UID
123 if ((reader) && (len == 9) && (data[0] == 0x97) && (data[1] == 0x70) && (CheckCrc14443(CRC_14443_A, data, 9)))
124 sniffState = SNF_SAK;
125 break;
126 }
127 case SNF_CARD_IDLE:{ // trace the card select sequence
128 sniffBuf[0] = 0xFF;
129 sniffBuf[1] = 0xFF;
130 memcpy(sniffBuf + 2, sniffUID, sizeof(sniffUID));
131 memcpy(sniffBuf + 12, sniffATQA, sizeof(sniffATQA));
132 sniffBuf[14] = sniffSAK;
133 sniffBuf[15] = 0xFF;
134 sniffBuf[16] = 0xFF;
135 LogTrace(sniffBuf, sizeof(sniffBuf), 0, 0, NULL, TRUE);
136 } // intentionally no break;
137 case SNF_CARD_CMD:{
138 LogTrace(data, len, 0, 0, NULL, TRUE);
139 sniffState = SNF_CARD_RESP;
140 timerData = GetTickCount();
141 break;
142 }
143 case SNF_CARD_RESP:{
144 LogTrace(data, len, 0, 0, NULL, FALSE);
145 sniffState = SNF_CARD_CMD;
146 timerData = GetTickCount();
147 break;
148 }
149 default:
150 sniffState = SNF_INIT;
151 break;
152 }
153 return FALSE;
154 }
155
156 bool RAMFUNC MfSniffSend(uint16_t maxTimeoutMs) {
157 if (BigBuf_get_traceLen() && (GetTickCount() > timerData + maxTimeoutMs)) {
158 return intMfSniffSend();
159 }
160 return FALSE;
161 }
162
163 // internal sending function. not a RAMFUNC.
164 bool intMfSniffSend() {
165
166 int pckSize = 0;
167 int pckLen = BigBuf_get_traceLen();
168 int pckNum = 0;
169 uint8_t *data = BigBuf_get_addr();
170
171 FpgaDisableSscDma();
172 while (pckLen > 0) {
173 pckSize = MIN(USB_CMD_DATA_SIZE, pckLen);
174 LED_B_ON();
175 cmd_send(CMD_ACK, 1, BigBuf_get_traceLen(), pckSize, data + BigBuf_get_traceLen() - pckLen, pckSize);
176 LED_B_OFF();
177 pckLen -= pckSize;
178 pckNum++;
179 }
180
181 LED_B_ON();
182 cmd_send(CMD_ACK,2,0,0,0,0); // 2 == data transfer is finished.
183 LED_B_OFF();
184
185 clear_trace();
186 return TRUE;
187 }
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