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lf keri demod - when doing invert of bits, do before decoding

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This commit is contained in:
iceman1001 2020-10-21 08:49:40 +02:00
parent be8d2fbd25
commit ce50c50fcd
1 changed files with 21 additions and 17 deletions
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38
client/src/cmdlfkeri.c
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@ -123,17 +123,6 @@ int demodKeri(bool verbose) {
setDemodBuff(DemodBuffer, size, idx);
setClockGrid(g_DemodClock, g_DemodStartIdx + (idx * g_DemodClock));
//got a good demod
uint32_t raw1 = bytebits_to_byte(DemodBuffer, 32);
uint32_t raw2 = bytebits_to_byte(DemodBuffer + 32, 32);
//get internal id
// uint32_t ID = bytebits_to_byte(DemodBuffer + 29, 32);
// Due to the 3 sync bits being at the start of the capture
// We can take the last 32bits as the internal ID.
uint32_t ID = raw2;
ID &= 0x7FFFFFFF;
/*
000000000000000000000000000001XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX111
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^1###############################^^^
@ -148,25 +137,40 @@ int demodKeri(bool verbose) {
Might be a hash of FC & CN to generate Internal ID
*/
PrintAndLogEx(SUCCESS, "KERI - Internal ID: " _GREEN_("%u") ", Raw: %08X%08X", ID, raw1, raw2);
/*
Descramble Data.
*/
uint32_t fc = 0;
uint32_t cardid = 0;
// Just need to the low 32 bits without the 111 trailer
CmdKeriMSScramble(Descramble, &fc, &cardid, &raw2);
PrintAndLogEx(SUCCESS, "Descrambled MS - FC: " _GREEN_("%d") " Card: " _GREEN_("%d"), fc, cardid);
//got a good demod
uint32_t raw1 = bytebits_to_byte(DemodBuffer, 32);
uint32_t raw2 = bytebits_to_byte(DemodBuffer + 32, 32);
if (invert) {
PrintAndLogEx(INFO, "Had to Invert - probably KERI");
for (size_t i = 0; i < size; i++)
DemodBuffer[i] ^= 1;
raw1 = bytebits_to_byte(DemodBuffer, 32);
raw2 = bytebits_to_byte(DemodBuffer + 32, 32);
CmdPrintDemodBuff("x");
}
//get internal id
// uint32_t ID = bytebits_to_byte(DemodBuffer + 29, 32);
// Due to the 3 sync bits being at the start of the capture
// We can take the last 32bits as the internal ID.
uint32_t ID = raw2;
ID &= 0x7FFFFFFF;
PrintAndLogEx(SUCCESS, "KERI - Internal ID: " _GREEN_("%u") ", Raw: %08X%08X", ID, raw1, raw2);
// Just need to the low 32 bits without the 111 trailer
CmdKeriMSScramble(Descramble, &fc, &cardid, &raw2);
PrintAndLogEx(SUCCESS, "Descrambled MS - FC: " _GREEN_("%d") " Card: " _GREEN_("%d"), fc, cardid);
return PM3_SUCCESS;
}