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