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CHG: Nedap demod, now verifes with first parity.

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This commit is contained in:
iceman1001 2016-05-04 10:34:16 +02:00
parent b85385a058
commit 532bcd7145
1 changed files with 27 additions and 11 deletions
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32
client/cmdlfnedap.c
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@ -107,16 +107,15 @@ int CmdLFNedapDemod(const char *Cmd) {
return 0;
}
/* Index map
0 10 20 30 40 50 64
| | | | | | |
preamble enc tag type encrypted uid d 33 d 90 p 04 d 71 d 40 d 45 d E7 P
/* Index map O
preamble enc tag type encrypted uid P d 33 d 90 d 04 d 71 d 40 d 45 d E7 P
1111111110 00101101000001011 01000110010010000101101010011010110 0 1 0 00110011 0 10010000 0 00000100 0 01110001 0 01000000 0 01000101 0 11100111 1
uid2 uid1 uid0 I I R R
Tag ID is 049033
I = Identical on all tags
R = Random ?
UID2, UID1, UID0 == card number
*/
//get raw ID before removing parities
uint32_t rawLo = bytebits_to_byte(DemodBuffer+idx+96,32);
@ -125,6 +124,21 @@ int CmdLFNedapDemod(const char *Cmd) {
uint32_t rawHi3 = bytebits_to_byte(DemodBuffer+idx,32);
setDemodBuf(DemodBuffer,128,idx);
// here 62 is length.
uint8_t first63bit_parity = GetParity( DemodBuffer, ODD, 62);
// Parity bits: 0-62 == 63
// here 62 is pos in a zero based array
if ( first63bit_parity != DemodBuffer[62] ) {
PrintAndLog("1st half parity check failed: %d | %d ", DemodBuffer[62], first63bit_parity);
return 0;
}
// uint8_t second63bit_parity = GetParity( DemodBuffer+64, ODD, 63);
// if ( second63bit_parity != DemodBuffer[127] ) {
// PrintAndLog("2st half parity check failed: %d | %d ", DemodBuffer[127], second63bit_parity);
// return 0;
// }
// ok valid card found!
uint32_t cardnum = bytebits_to_byte(DemodBuffer+81, 16);
PrintAndLog("NEDAP ID Found - Card: %d - Raw: %08x%08x%08x%08x", cardnum, rawHi3, rawHi2, rawHi, rawLo);
@ -133,10 +147,8 @@ int CmdLFNedapDemod(const char *Cmd) {
PrintAndLog("DEBUG: idx: %d, Len: %d, Printing Demod Buffer:", idx, 128);
printDemodBuff();
}
PrintAndLog("BIN: %s", sprint_bin_break( DemodBuffer, 64, 64) );
uint8_t last = GetParity( DemodBuffer, EVEN, 128);
// PrintAndLog("BIN: %s", sprint_bin_break( DemodBuffer, 128, 32) );
PrintAndLog("TEST: LASTPARITY %d | %d ", DemodBuffer[127], last);
return 1;
}
@ -251,7 +263,7 @@ int CmdLFNedapSim(const char *Cmd) {
int CmdLFNedapChk(const char *Cmd){
uint8_t data[20] = { 0x30, 0x16, 0x00, 0x71, 0x40, 0x21, 0xBE};
uint8_t data[256] = { 0x30, 0x16, 0x00, 0x71, 0x40, 0x21, 0xBE};
int len = 0;
param_gethex_ex(Cmd, 0, data, &len);
@ -259,6 +271,10 @@ int CmdLFNedapChk(const char *Cmd){
PrintAndLog("Input: [%d] %s", len, sprint_hex(data, len));
uint8_t last = GetParity(data, EVEN, 62);
PrintAndLog("TEST PARITY:: %d | %d ", DemodBuffer[62], last);
return 1;
uint8_t cl = 0x1D, ch = 0x1D, carry = 0;
uint8_t al, bl, temp;