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fix/update removeParity & fix securakey detection
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c3caf0409c
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@ -83,33 +83,37 @@ int CmdSecurakeyDemod(const char *Cmd) {
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// y = card #
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// standard wiegand parities.
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// unknown checksum 11 bits? at the end
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uint8_t bits_no_spacer[86];
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memcpy(bits_no_spacer, DemodBuffer + 10, 86);
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uint8_t bits_no_spacer[85];
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memcpy(bits_no_spacer, DemodBuffer + 11, 85);
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// remove marker bits (0's every 9th digit after preamble) (pType = 3 (always 0s))
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size = removeParity(bits_no_spacer, 0, 9, 3, 86);
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if ( size != 86-10 ) {
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size = removeParity(bits_no_spacer, 0, 9, 3, 85);
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if ( size != 85-9 ) {
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if (g_debugMode) PrintAndLog("DEBUG: Error removeParity: %d", size);
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return 0;
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}
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uint8_t bitLen = (uint8_t)bytebits_to_byte(DemodBuffer+2, 6);
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uint8_t bitLen = (uint8_t)bytebits_to_byte(bits_no_spacer+2, 6);
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uint32_t fc=0, lWiegand=0, rWiegand=0;
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// get FC
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if (bitLen > 40) { //securakey's max bitlen is 40 bits...
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if (g_debugMode) PrintAndLog("DEBUG: Error bitLen too long: %u", bitLen);
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return 0;
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}
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// get left 1/2 wiegand & right 1/2 wiegand (for parity test and wiegand print)
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lWiegand = bytebits_to_byte(DemodBuffer + 48 - bitLen, bitLen/2);
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rWiegand = bytebits_to_byte(DemodBuffer + 48 - bitLen + bitLen/2, bitLen/2);
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fc = bytebits_to_byte(DemodBuffer+49-bitLen, bitLen-2-16);
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lWiegand = bytebits_to_byte(bits_no_spacer + 48 - bitLen, bitLen/2);
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rWiegand = bytebits_to_byte(bits_no_spacer + 48 - bitLen + bitLen/2, bitLen/2);
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// get FC
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fc = bytebits_to_byte(bits_no_spacer+49-bitLen, bitLen-2-16);
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// test bitLen
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if (bitLen != 26 && bitLen != 32)
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PrintAndLog("***unknown securakey bitLen - share with forum***");
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uint32_t cardid = bytebits_to_byte(DemodBuffer+8+23, 16);
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// test parities
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bool parity = evenparity32(lWiegand) && oddparity32(rWiegand);
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uint32_t cardid = bytebits_to_byte(bits_no_spacer+8+23, 16);
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// test parities - evenparity32 looks to add an even parity returns 0 if already even...
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bool parity = !evenparity32(lWiegand) && !oddparity32(rWiegand);
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PrintAndLog("Securakey Tag Found--BitLen: %u, Card ID: %u, FC: %X, Raw: %08X%08X%08X", bitLen, cardid, fc, raw1 ,raw2, raw3);
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PrintAndLog("Securakey Tag Found--BitLen: %u, Card ID: %u, FC: 0x%X, Raw: %08X%08X%08X", bitLen, cardid, fc, raw1 ,raw2, raw3);
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if (bitLen <= 32)
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PrintAndLog("Wiegand: %08X, Parity: %s", (lWiegand<<(bitLen/2)) | rWiegand, parity ? "Passed" : "Failed");
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PrintAndLog("\nHow the FC translates to printed FC is unknown");
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@ -35,6 +35,7 @@
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#include <string.h> // for memset, memcmp and size_t
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#include <stdint.h> // for uint_32+
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#include <stdbool.h> // for bool
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#include "parity.h" // for parity test
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//**********************************************************************************************
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//---------------------------------Utilities Section--------------------------------------------
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@ -82,40 +83,35 @@ int getHiLo(uint8_t *BitStream, size_t size, int *high, int *low, uint8_t fuzzHi
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// by marshmellow
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// pass bits to be tested in bits, length bits passed in bitLen, and parity type (even=0 | odd=1) in pType
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// returns 1 if passed
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uint8_t parityTest(uint32_t bits, uint8_t bitLen, uint8_t pType) {
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uint8_t ans = 0;
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for (uint8_t i = 0; i < bitLen; i++){
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ans ^= ((bits >> i) & 1);
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}
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if (g_debugMode) prnt("DEBUG: ans: %d, ptype: %d, bits: %08X",ans,pType,bits);
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return (ans == pType);
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bool parityTest(uint32_t bits, uint8_t bitLen, uint8_t pType) {
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return oddparity32(bits) ^ pType;
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}
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// by marshmellow
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// takes a array of binary values, start position, length of bits per parity (includes parity bit),
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// Parity Type (1 for odd; 0 for even; 2 for Always 1's; 3 for Always 0's), and binary Length (length to run)
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// takes a array of binary values, start position, length of bits per parity (includes parity bit - MAX 32),
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// Parity Type (1 for odd; 0 for even; 2 for Always 1's; 3 for Always 0's), and binary Length (length to run)
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size_t removeParity(uint8_t *BitStream, size_t startIdx, uint8_t pLen, uint8_t pType, size_t bLen) {
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uint32_t parityWd = 0;
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size_t j = 0, bitCnt = 0;
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size_t bitCnt = 0;
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for (int word = 0; word < (bLen); word+=pLen) {
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for (int bit=0; bit < pLen; bit++) {
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if (word+bit >= bLen) break;
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parityWd = (parityWd << 1) | BitStream[startIdx+word+bit];
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BitStream[j++] = (BitStream[startIdx+word+bit]);
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BitStream[bitCnt++] = (BitStream[startIdx+word+bit]);
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}
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if (word+pLen > bLen) break;
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j--; // overwrite parity with next data
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bitCnt--; // overwrite parity with next data
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// if parity fails then return 0
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switch (pType) {
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case 3: if (BitStream[j]==1) {return 0;} break; //should be 0 spacer bit
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case 2: if (BitStream[j]==0) {return 0;} break; //should be 1 spacer bit
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case 3: if (BitStream[bitCnt]==1) {return 0;} break; //should be 0 spacer bit
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case 2: if (BitStream[bitCnt]==0) {return 0;} break; //should be 1 spacer bit
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default: if (parityTest(parityWd, pLen, pType) == 0) {return 0;} break; //test parity
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}
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bitCnt+=(pLen-1);
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parityWd = 0;
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}
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// if we got here then all the parities passed
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//return ID start index and size
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//return size
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return bitCnt;
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}
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@ -1687,6 +1683,7 @@ uint8_t Em410xDecode(uint8_t *BitStream, size_t *size, size_t *startIdx, uint32_
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*hi = (bytebits_to_byte(BitStream, 24));
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*lo = ((uint64_t)(bytebits_to_byte(BitStream + 24, 32)) << 32) | (bytebits_to_byte(BitStream + 24 + 32, 32));
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} else {
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if (g_debugMode) prnt("Error removing parity: %u", *size);
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return 0;
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}
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return 1;
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