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git.zerfleddert.de Git - proxmark3-svn/blob - client/cmdlfsecurakey.c
1 //-----------------------------------------------------------------------------
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
6 //-----------------------------------------------------------------------------
7 // Low frequency Securakey tag commands
8 // ASK/Manchester, RF/40, 96 bits long (unknown cs)
9 //-----------------------------------------------------------------------------
11 #include "cmdlfsecurakey.h"
20 #include "cmdparser.h"
24 #include "protocols.h" // for T55xx config register definitions
25 #include "lfdemod.h" // preamble test
26 #include "parity.h" // for wiegand parity test
28 static int CmdHelp(const char *Cmd
);
31 // find Securakey preamble in already demoded data
32 int SecurakeyFind(uint8_t *dest
, size_t *size
) {
33 if (*size
< 96) return -1; //make sure buffer has data
35 uint8_t preamble
[] = {0,1,1,1,1,1,1,1,1,1,0,0,1};
36 if (!preambleSearch(dest
, preamble
, sizeof(preamble
), size
, &startIdx
))
37 return -2; //preamble not found
38 if (*size
!= 96) return -3; //wrong demoded size
39 //return start position
43 //see ASKDemod for what args are accepted
44 int CmdSecurakeyDemod(const char *Cmd
) {
48 if (!ASKDemod_ext("40 0 0", false, false, 1, &st
)) {
49 if (g_debugMode
) PrintAndLog("DEBUG: Error - Securakey: ASK/Manchester Demod failed");
53 size_t size
= DemodBufferLen
;
54 int ans
= SecurakeyFind(DemodBuffer
, &size
);
58 PrintAndLog("DEBUG: Error - Securakey: too few bits found");
60 PrintAndLog("DEBUG: Error - Securakey: preamble not found");
62 PrintAndLog("DEBUG: Error - Securakey: Size not correct: %d", size
);
64 PrintAndLog("DEBUG: Error - Securakey: ans: %d", ans
);
68 setDemodBuf(DemodBuffer
, 96, ans
);
69 setClockGrid(g_DemodClock
, g_DemodStartIdx
+ (ans
*g_DemodClock
));
72 uint32_t raw1
= bytebits_to_byte(DemodBuffer
, 32);
73 uint32_t raw2
= bytebits_to_byte(DemodBuffer
+32, 32);
74 uint32_t raw3
= bytebits_to_byte(DemodBuffer
+64, 32);
77 // preamble ??bitlen reserved EPx xxxxxxxy yyyyyyyy yyyyyyyOP CS? CS2?
78 // 0111111111 0 01011010 0 00000000 0 00000010 0 00110110 0 00111110 0 01100010 0 00001111 0 01100000 0 00000000 0 0000
81 // preamble ??bitlen reserved EPxxxxxxx xxxxxxxy yyyyyyyy yyyyyyyOP CS? CS2?
82 // 0111111111 0 01100000 0 00000000 0 10000100 0 11001010 0 01011011 0 01010110 0 00010110 0 11100000 0 00000000 0 0000
86 // standard wiegand parities.
87 // unknown checksum 11 bits? at the end
88 uint8_t bits_no_spacer
[85];
89 memcpy(bits_no_spacer
, DemodBuffer
+ 11, 85);
91 // remove marker bits (0's every 9th digit after preamble) (pType = 3 (always 0s))
92 size
= removeParity(bits_no_spacer
, 0, 9, 3, 85);
94 if (g_debugMode
) PrintAndLog("DEBUG: Error removeParity: %d", size
);
98 uint8_t bitLen
= (uint8_t)bytebits_to_byte(bits_no_spacer
+2, 6);
99 uint32_t fc
=0, lWiegand
=0, rWiegand
=0;
100 if (bitLen
> 40) { //securakey's max bitlen is 40 bits...
101 if (g_debugMode
) PrintAndLog("DEBUG: Error bitLen too long: %u", bitLen
);
104 // get left 1/2 wiegand & right 1/2 wiegand (for parity test and wiegand print)
105 lWiegand
= bytebits_to_byte(bits_no_spacer
+ 48 - bitLen
, bitLen
/2);
106 rWiegand
= bytebits_to_byte(bits_no_spacer
+ 48 - bitLen
+ bitLen
/2, bitLen
/2);
108 fc
= bytebits_to_byte(bits_no_spacer
+49-bitLen
, bitLen
-2-16);
111 if (bitLen
!= 26 && bitLen
!= 32)
112 PrintAndLog("***unknown securakey bitLen - share with forum***");
114 uint32_t cardid
= bytebits_to_byte(bits_no_spacer
+8+23, 16);
115 // test parities - evenparity32 looks to add an even parity returns 0 if already even...
116 bool parity
= !evenparity32(lWiegand
) && !oddparity32(rWiegand
);
118 PrintAndLog("Securakey Tag Found--BitLen: %u, Card ID: %u, FC: 0x%X, Raw: %08X%08X%08X", bitLen
, cardid
, fc
, raw1
,raw2
, raw3
);
120 PrintAndLog("Wiegand: %08X, Parity: %s", (lWiegand
<<(bitLen
/2)) | rWiegand
, parity
? "Passed" : "Failed");
121 PrintAndLog("\nHow the FC translates to printed FC is unknown");
122 PrintAndLog("How the checksum is calculated is unknown");
123 PrintAndLog("Help the community identify this format further\n by sharing your tag on the pm3 forum or with forum members");
127 int CmdSecurakeyRead(const char *Cmd
) {
129 return CmdSecurakeyDemod(Cmd
);
132 static command_t CommandTable
[] = {
133 {"help", CmdHelp
, 1, "This help"},
134 {"demod", CmdSecurakeyDemod
,1, "Attempt to read and extract tag data from the GraphBuffer"},
135 {"read", CmdSecurakeyRead
, 0, "Attempt to read and extract tag data from the antenna"},
136 {NULL
, NULL
, 0, NULL
}
139 int CmdLFSecurakey(const char *Cmd
) {
140 clearCommandBuffer();
141 CmdsParse(CommandTable
, Cmd
);
145 int CmdHelp(const char *Cmd
) {
146 CmdsHelp(CommandTable
);