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Added parity calculation support for 35-bit (Corp 1000) HID cards

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This commit is contained in:
grauerfuchs 2018-08-08 20:30:22 -04:00
commit 0e9f325440
1 changed files with 24 additions and 8 deletions
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32
client/cmdlfhid.c
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@ -38,7 +38,7 @@ static int CmdHelp(const char *Cmd);
*
* This only works with 26, 34, 35 and 37 bit card IDs.
*
* NOTE: Parity calculation is only supported on 26-bit tags. Other card lengths
* NOTE: Parity calculation is only supported on 26-bit and 35-bit tags. Other card lengths
* may have invalid parity.
*
* Returns false on invalid inputs.
@ -69,7 +69,9 @@ bool pack_short_hid(/* out */ uint32_t *hi, /* out */ uint32_t *lo, /* in */ con
low |= (info->cardnum & 0xfffff) << 1;
low |= (info->fc & 0x7ff) << 21;
high |= (info->fc & 0x800) >> 11;
// TODO: Calculate parity
high |= (evenparity32((high & 0x05) ^ (low & 0xB6DB6DB6)) & 1) << 1;
low |= (oddparity32((high & 0x03) ^ (low & 0x6DB6DB6D)) & 1);
high |= (oddparity32((high & 0x07) ^ (low & 0xFFFFFFFF)) & 1) << 2;
break;
case 37:
@ -148,7 +150,7 @@ bool pack_long_hid(/* out */ uint32_t *hi2, /* out */ uint32_t *hi, /* out */ ui
*
* This only works with 26, 34, 35 and 37 bit card IDs.
*
* NOTE: Parity checking is only supported on 26-bit tags.
* NOTE: Parity checking is only supported on 26-bit and 35-bit tags.
*
* Returns false on invalid inputs.
*/
@ -195,7 +197,21 @@ bool unpack_short_hid(short_hid_info *out, uint32_t hi, uint32_t lo) {
case 35:
out->cardnum = (lo >> 1) & 0xFFFFF;
out->fc = ((hi & 1) << 11) | (lo >> 21);
// TODO: Calculate parity
out->parityValid =
(evenparity32((hi & 0x01) ^ (lo & 0xB6DB6DB6)) == ((hi >> 1) & 1)) &&
(oddparity32((hi & 0x03) ^ (lo & 0x6DB6DB6C)) == ((lo >> 0) & 1)) &&
(oddparity32((hi & 0x03) ^ (lo & 0xFFFFFFFF)) == ((hi >> 2) & 1));
if (g_debugMode) {
PrintAndLog("Parity check: %d, %d, %d vs bits %d, %d, %d",
evenparity32((hi & 0x01) ^ (lo & 0xB6DB6DB6)),
oddparity32((hi & 0x03) ^ (lo & 0x6DB6DB6C)),
oddparity32((hi & 0x03) ^ (lo & 0xFFFFFFFF)),
((hi >> 1) & 1),
((lo >> 0) & 1),
((hi >> 2) & 1)
);
}
break;
default:
@ -327,7 +343,7 @@ int CmdFSKdemodHID(const char *Cmd)
(unsigned int) hi, (unsigned int) lo, (unsigned int) (lo>>1) & 0xFFFF,
card_info.fmtLen, card_info.fc, card_info.cardnum);
if (card_info.fmtLen == 26) {
if (card_info.fmtLen == 26 || card_info.fmtLen == 35) {
PrintAndLog("Parity: %s", card_info.parityValid ? "valid" : "invalid");
}
@ -406,8 +422,8 @@ int CmdHIDPack(const char *Cmd) {
uint8_t fmtLen = param_get8(Cmd, 0);
// TODO
if (fmtLen != 26) {
PrintAndLog("Warning: Parity bits are only calculated for 26 bit IDs -- this may be invalid!");
if (fmtLen != 26 && fmtLen != 35) {
PrintAndLog("Warning: Parity bits are only calculated for 26 and 35 bit IDs -- this may be invalid!");
}
bool ret;
@ -479,7 +495,7 @@ int CmdHIDUnpack(const char *Cmd)
(unsigned int) hi, (unsigned int) lo, (unsigned int) (lo>>1) & 0xFFFF,
card_info.fmtLen, card_info.fc, card_info.cardnum);
if (card_info.fmtLen == 26) {
if (card_info.fmtLen == 26 || card_info.fmtLen == 35) {
PrintAndLog("Parity: %s", card_info.parityValid ? "valid" : "invalid");
}
}