PrintAndLog("The bytes will be added with eachother and than limited with the applied mask");
PrintAndLog("Finally compute ones' complement of the least significant bytes");
PrintAndLog("");
- PrintAndLog("Usage: analyse chksum [h] b <bytes> m <mask>");
+ PrintAndLog("Usage: analyse chksum [h] [v] b <bytes> m <mask>");
PrintAndLog("Options:");
PrintAndLog(" h This help");
+ PrintAndLog(" v supress header");
PrintAndLog(" b <bytes> bytes to calc missing XOR in a LCR");
PrintAndLog(" m <mask> bit mask to limit the outpuyt");
PrintAndLog("");
return LRC;
}
-static uint8_t calcSumCrumbAdd( uint8_t* bytes, uint8_t len, uint32_t mask) {
+static uint16_t calcSumCrumbAdd( uint8_t* bytes, uint8_t len, uint32_t mask) {
uint8_t sum = 0;
for (uint8_t i = 0; i < len; i++) {
sum += CRUMB(bytes[i], 0);
sum &= mask;
return sum;
}
-static uint8_t calcSumCrumbAddOnes( uint8_t* bytes, uint8_t len, uint32_t mask) {
- return ~calcSumCrumbAdd(bytes, len, mask);
+static uint16_t calcSumCrumbAddOnes( uint8_t* bytes, uint8_t len, uint32_t mask) {
+ return (~calcSumCrumbAdd(bytes, len, mask) & mask);
}
-static uint8_t calcSumNibbleAdd( uint8_t* bytes, uint8_t len, uint32_t mask) {
+static uint16_t calcSumNibbleAdd( uint8_t* bytes, uint8_t len, uint32_t mask) {
uint8_t sum = 0;
for (uint8_t i = 0; i < len; i++) {
sum += NIBBLE_LOW(bytes[i]);
sum &= mask;
return sum;
}
-static uint8_t calcSumNibbleAddOnes( uint8_t* bytes, uint8_t len, uint32_t mask){
- return ~calcSumNibbleAdd(bytes, len, mask);
+static uint16_t calcSumNibbleAddOnes( uint8_t* bytes, uint8_t len, uint32_t mask){
+ return (~calcSumNibbleAdd(bytes, len, mask) & mask);
}
-static uint8_t calcSumNibbleXor( uint8_t* bytes, uint8_t len, uint32_t mask) {
+static uint16_t calcSumCrumbXor( uint8_t* bytes, uint8_t len, uint32_t mask) {
+ uint8_t sum = 0;
+ for (uint8_t i = 0; i < len; i++) {
+ sum ^= CRUMB(bytes[i], 0);
+ sum ^= CRUMB(bytes[i], 2);
+ sum ^= CRUMB(bytes[i], 4);
+ sum ^= CRUMB(bytes[i], 6);
+ }
+ sum &= mask;
+ return sum;
+}
+static uint16_t calcSumNibbleXor( uint8_t* bytes, uint8_t len, uint32_t mask) {
uint8_t sum = 0;
for (uint8_t i = 0; i < len; i++) {
sum ^= NIBBLE_LOW(bytes[i]);
sum ^= NIBBLE_HIGH(bytes[i]);
}
- sum &= mask;
+ sum &= mask;
return sum;
}
-static uint8_t calcSumByteXor( uint8_t* bytes, uint8_t len, uint32_t mask) {
+static uint16_t calcSumByteXor( uint8_t* bytes, uint8_t len, uint32_t mask) {
uint8_t sum = 0;
for (uint8_t i = 0; i < len; i++)
sum ^= bytes[i];
sum &= mask;
return sum;
}
-
-static uint8_t calcSumByteAdd( uint8_t* bytes, uint8_t len, uint32_t mask) {
+static uint16_t calcSumByteAdd( uint8_t* bytes, uint8_t len, uint32_t mask) {
uint8_t sum = 0;
for (uint8_t i = 0; i < len; i++)
sum += bytes[i];
return sum;
}
// Ones complement
-static uint8_t calcSumByteAddOnes( uint8_t* bytes, uint8_t len, uint32_t mask) {
- return ~calcSumByteAdd(bytes, len, mask);
+static uint16_t calcSumByteAddOnes( uint8_t* bytes, uint8_t len, uint32_t mask) {
+ return (~calcSumByteAdd(bytes, len, mask) & mask);
}
-
-
-static uint8_t calcSumByteSub( uint8_t* bytes, uint8_t len, uint32_t mask) {
+static uint16_t calcSumByteSub( uint8_t* bytes, uint8_t len, uint32_t mask) {
uint8_t sum = 0;
for (uint8_t i = 0; i < len; i++)
sum -= bytes[i];
sum &= mask;
return sum;
}
-static uint8_t calcSumByteSubOnes( uint8_t* bytes, uint8_t len, uint32_t mask){
- return ~calcSumByteSub(bytes, len, mask);
+static uint16_t calcSumByteSubOnes( uint8_t* bytes, uint8_t len, uint32_t mask){
+ return (~calcSumByteSub(bytes, len, mask) & mask);
}
-static uint8_t calcSumNibbleSub( uint8_t* bytes, uint8_t len, uint32_t mask) {
+static uint16_t calcSumNibbleSub( uint8_t* bytes, uint8_t len, uint32_t mask) {
uint8_t sum = 0;
for (uint8_t i = 0; i < len; i++) {
sum -= NIBBLE_LOW(bytes[i]);
sum &= mask;
return sum;
}
-static uint8_t calcSumNibbleSubOnes( uint8_t* bytes, uint8_t len, uint32_t mask) {
- return ~calcSumNibbleSub(bytes, len, mask);
+static uint16_t calcSumNibbleSubOnes( uint8_t* bytes, uint8_t len, uint32_t mask) {
+ return (~calcSumNibbleSub(bytes, len, mask) & mask);
+}
+
+// BSD shift checksum 8bit version
+static uint16_t calcBSDchecksum8( uint8_t* bytes, uint8_t len, uint32_t mask){
+ uint16_t sum = 0;
+ for(uint8_t i = 0; i < len; i++){
+ sum = ((sum & 0xFF) >> 1) | ((sum & 0x1) << 7); // rotate accumulator
+ sum += bytes[i]; // add next byte
+ sum &= 0xFF; //
+ }
+ sum &= mask;
+ return sum;
+}
+// BSD shift checksum 4bit version
+static uint16_t calcBSDchecksum4( uint8_t* bytes, uint8_t len, uint32_t mask){
+ uint16_t sum = 0;
+ for(uint8_t i = 0; i < len; i++){
+ sum = ((sum & 0xF) >> 1) | ((sum & 0x1) << 3); // rotate accumulator
+ sum += NIBBLE_HIGH(bytes[i]); // add high nibble
+ sum &= 0xF; //
+ sum = ((sum & 0xF) >> 1) | ((sum & 0x1) << 3); // rotate accumulator
+ sum += NIBBLE_LOW(bytes[i]); // add low nibble
+ sum &= 0xF; //
+ }
+ sum &= mask;
+ return sum;
}
// measuring LFSR maximum length
uint8_t data[50];
uint8_t cmdp = 0;
- uint32_t mask = 0xFF;
+ uint32_t mask = 0xFFFF;
bool errors = false;
+ bool useHeader = false;
int len = 0;
memset(data, 0x0, sizeof(data));
mask = param_get32ex(Cmd, cmdp+1, 0, 16);
cmdp += 2;
break;
+ case 'v':
+ case 'V':
+ useHeader = true;
+ cmdp++;
+ break;
case 'h':
case 'H':
return usage_analyse_checksum();
//Validations
if(errors) return usage_analyse_checksum();
- PrintAndLog("\nByte Add | 0x%X", calcSumByteAdd(data, len, mask));
- PrintAndLog("Nibble Add | 0x%X", calcSumNibbleAdd(data, len, mask));
- PrintAndLog("Crumb Add | 0x%X", calcSumCrumbAdd(data, len, mask));
-
- PrintAndLog("\nByte Subtract | 0x%X", calcSumByteSub(data, len, mask));
- PrintAndLog("Nibble Subtract | 0x%X", calcSumNibbleSub(data, len, mask));
-
- PrintAndLog("\nCHECKSUM - One's complement");
- PrintAndLog("Byte Add | 0x%X", calcSumByteAddOnes(data, len, mask));
- PrintAndLog("Nibble Add | 0x%X", calcSumNibbleAddOnes(data, len, mask));
- PrintAndLog("Crumb Add | 0x%X", calcSumCrumbAddOnes(data, len, mask));
-
- PrintAndLog("Byte Subtract | 0x%X", calcSumByteSubOnes(data, len, mask));
- PrintAndLog("Nibble Subtract | 0x%X", calcSumNibbleSubOnes(data, len, mask));
-
- PrintAndLog("\nXOR");
- PrintAndLog("Byte Xor | 0x%X", calcSumByteXor(data, len, mask));
- PrintAndLog("Nibble Xor | 0x%X", calcSumNibbleXor(data, len, mask));
-
+ if (useHeader) {
+ PrintAndLog(" add | sub | add 1's compl | sub 1's compl | xor");
+ PrintAndLog("byte nibble crumb | byte nibble | byte nibble cumb | byte nibble | byte nibble cumb | BSD |");
+ PrintAndLog("------------------+-------------+------------------+-----------------+--------------------");
+ }
+ PrintAndLog("0x%X 0x%X 0x%X | 0x%X 0x%X | 0x%X 0x%X 0x%X | 0x%X 0x%X | 0x%X 0x%X 0x%X | 0x%X 0x%X |\n",
+ calcSumByteAdd(data, len, mask)
+ , calcSumNibbleAdd(data, len, mask)
+ , calcSumCrumbAdd(data, len, mask)
+ , calcSumByteSub(data, len, mask)
+ , calcSumNibbleSub(data, len, mask)
+ , calcSumByteAddOnes(data, len, mask)
+ , calcSumNibbleAddOnes(data, len, mask)
+ , calcSumCrumbAddOnes(data, len, mask)
+ , calcSumByteSubOnes(data, len, mask)
+ , calcSumNibbleSubOnes(data, len, mask)
+ , calcSumByteXor(data, len, mask)
+ , calcSumNibbleXor(data, len, mask)
+ , calcSumCrumbXor(data, len, mask)
+ , calcBSDchecksum8(data, len, mask)
+ , calcBSDchecksum4(data, len, mask)
+ );
return 0;
}
}
int CmdAnalyseHid(const char *Cmd){
+ uint8_t key[8] = {0};
+ uint8_t key_std_format[8] = {0};
+ uint8_t key_iclass_format[8] = {0};
uint8_t data[16] = {0};
bool isReverse = FALSE;
int len = 0;
param_gethex_ex(Cmd, 1, data, &len);
if ( len%2 ) return usage_analyse_hid();
- len >>= 1;
-
- if ( isReverse )
+ len >>= 1;
+
+ memcpy(key, data, 8);
+
+ if ( isReverse ) {
generate_rev(data, len);
- else
+ permutekey_rev(key, key_std_format);
+ printf(" holiman iclass key | %s \n", sprint_hex(key_std_format, 8));
+ }
+ else {
generate(data, len);
+ permutekey(key, key_iclass_format);
+ printf(" holiman std key | %s \n", sprint_hex(key_iclass_format, 8));
+ }
return 0;
}
projects / proxmark3-svn / blobdiff