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https://github.com/RfidResearchGroup/proxmark3.git
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CHG: @marshmellow42 's em4x50 changes
ADD: 'analys chksum' - added a BSD styled 4 and 8 bit shift checksum
This commit is contained in:
iceman1001
parent
f9f5f45000
commit
62dc7d4a6f
2 changed files with 101 additions and 50 deletions
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@ -75,7 +75,7 @@ static uint8_t calculateLRC( uint8_t* bytes, uint8_t len) {
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return LRC;
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}
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static uint8_t calcSumCrumbAdd( uint8_t* bytes, uint8_t len, uint32_t mask) {
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static uint16_t calcSumCrumbAdd( uint8_t* bytes, uint8_t len, uint32_t mask) {
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uint8_t sum = 0;
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for (uint8_t i = 0; i < len; i++) {
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sum += CRUMB(bytes[i], 0);
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@ -86,10 +86,10 @@ static uint8_t calcSumCrumbAdd( uint8_t* bytes, uint8_t len, uint32_t mask) {
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sum &= mask;
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return sum;
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}
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static uint8_t calcSumCrumbAddOnes( uint8_t* bytes, uint8_t len, uint32_t mask) {
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static uint16_t calcSumCrumbAddOnes( uint8_t* bytes, uint8_t len, uint32_t mask) {
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return ~calcSumCrumbAdd(bytes, len, mask);
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}
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static uint8_t calcSumNibbleAdd( uint8_t* bytes, uint8_t len, uint32_t mask) {
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static uint16_t calcSumNibbleAdd( uint8_t* bytes, uint8_t len, uint32_t mask) {
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uint8_t sum = 0;
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for (uint8_t i = 0; i < len; i++) {
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sum += NIBBLE_LOW(bytes[i]);
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@ -98,10 +98,10 @@ static uint8_t calcSumNibbleAdd( uint8_t* bytes, uint8_t len, uint32_t mask) {
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sum &= mask;
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return sum;
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}
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static uint8_t calcSumNibbleAddOnes( uint8_t* bytes, uint8_t len, uint32_t mask){
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static uint16_t calcSumNibbleAddOnes( uint8_t* bytes, uint8_t len, uint32_t mask){
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return ~calcSumNibbleAdd(bytes, len, mask);
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}
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static uint8_t calcSumCrumbXor( uint8_t* bytes, uint8_t len, uint32_t mask) {
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static uint16_t calcSumCrumbXor( uint8_t* bytes, uint8_t len, uint32_t mask) {
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uint8_t sum = 0;
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for (uint8_t i = 0; i < len; i++) {
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sum ^= CRUMB(bytes[i], 0);
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@ -112,7 +112,7 @@ static uint8_t calcSumCrumbXor( uint8_t* bytes, uint8_t len, uint32_t mask) {
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sum &= mask;
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return sum;
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}
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static uint8_t calcSumNibbleXor( uint8_t* bytes, uint8_t len, uint32_t mask) {
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static uint16_t calcSumNibbleXor( uint8_t* bytes, uint8_t len, uint32_t mask) {
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uint8_t sum = 0;
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for (uint8_t i = 0; i < len; i++) {
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sum ^= NIBBLE_LOW(bytes[i]);
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@ -121,15 +121,14 @@ static uint8_t calcSumNibbleXor( uint8_t* bytes, uint8_t len, uint32_t mask) {
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sum &= mask;
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return sum;
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}
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static uint8_t calcSumByteXor( uint8_t* bytes, uint8_t len, uint32_t mask) {
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static uint16_t calcSumByteXor( uint8_t* bytes, uint8_t len, uint32_t mask) {
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uint8_t sum = 0;
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for (uint8_t i = 0; i < len; i++)
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sum ^= bytes[i];
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sum &= mask;
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return sum;
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}
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static uint8_t calcSumByteAdd( uint8_t* bytes, uint8_t len, uint32_t mask) {
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static uint16_t calcSumByteAdd( uint8_t* bytes, uint8_t len, uint32_t mask) {
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uint8_t sum = 0;
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for (uint8_t i = 0; i < len; i++)
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sum += bytes[i];
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@ -137,23 +136,21 @@ static uint8_t calcSumByteAdd( uint8_t* bytes, uint8_t len, uint32_t mask) {
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return sum;
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}
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// Ones complement
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static uint8_t calcSumByteAddOnes( uint8_t* bytes, uint8_t len, uint32_t mask) {
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static uint16_t calcSumByteAddOnes( uint8_t* bytes, uint8_t len, uint32_t mask) {
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return ~calcSumByteAdd(bytes, len, mask);
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}
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static uint8_t calcSumByteSub( uint8_t* bytes, uint8_t len, uint32_t mask) {
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static uint16_t calcSumByteSub( uint8_t* bytes, uint8_t len, uint32_t mask) {
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uint8_t sum = 0;
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for (uint8_t i = 0; i < len; i++)
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sum -= bytes[i];
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sum &= mask;
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return sum;
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}
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static uint8_t calcSumByteSubOnes( uint8_t* bytes, uint8_t len, uint32_t mask){
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static uint16_t calcSumByteSubOnes( uint8_t* bytes, uint8_t len, uint32_t mask){
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return ~calcSumByteSub(bytes, len, mask);
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}
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static uint8_t calcSumNibbleSub( uint8_t* bytes, uint8_t len, uint32_t mask) {
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static uint16_t calcSumNibbleSub( uint8_t* bytes, uint8_t len, uint32_t mask) {
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uint8_t sum = 0;
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for (uint8_t i = 0; i < len; i++) {
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sum -= NIBBLE_LOW(bytes[i]);
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@ -162,10 +159,38 @@ static uint8_t calcSumNibbleSub( uint8_t* bytes, uint8_t len, uint32_t mask) {
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sum &= mask;
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return sum;
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}
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static uint8_t calcSumNibbleSubOnes( uint8_t* bytes, uint8_t len, uint32_t mask) {
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static uint16_t calcSumNibbleSubOnes( uint8_t* bytes, uint8_t len, uint32_t mask) {
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return ~calcSumNibbleSub(bytes, len, mask);
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}
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// BSD shift checksum 8bit version
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static uint16_t calcBSDchecksum8( uint8_t* bytes, uint8_t len, uint32_t mask){
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uint16_t sum = 0;
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for(uint8_t i = 0; i < len; i++){
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sum = ((sum & 0xFF) >> 1) | ((sum & 0x1) << 7); // rotate accumulator
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sum += bytes[i]; // add next byte
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sum &= 0xFF; //
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}
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sum &= mask;
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return sum;
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}
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// BSD shift checksum 4bit version
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static uint16_t calcBSDchecksum4( uint8_t* bytes, uint8_t len, uint32_t mask){
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uint16_t sum = 0;
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for(uint8_t i = 0; i < len; i++){
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sum = ((sum & 0xF) >> 1) | ((sum & 0x1) << 3); // rotate accumulator
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sum += NIBBLE_HIGH(bytes[i]); // add high nibble
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sum &= 0xF; //
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sum = ((sum & 0xF) >> 1) | ((sum & 0x1) << 3); // rotate accumulator
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sum += NIBBLE_LOW(bytes[i]); // add low nibble
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sum &= 0xF; //
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}
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sum &= mask;
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return sum;
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}
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// measuring LFSR maximum length
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int CmdAnalyseLfsr(const char *Cmd){
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@ -261,6 +286,7 @@ int CmdAnalyseCHKSUM(const char *Cmd){
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uint8_t cmdp = 0;
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uint32_t mask = 0xFFFF;
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bool errors = false;
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bool useHeader = false;
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int len = 0;
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memset(data, 0x0, sizeof(data));
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@ -278,6 +304,11 @@ int CmdAnalyseCHKSUM(const char *Cmd){
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mask = param_get32ex(Cmd, cmdp+1, 0, 16);
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cmdp += 2;
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break;
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case 'v':
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case 'V':
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useHeader = true;
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cmdp++;
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break;
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case 'h':
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case 'H':
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return usage_analyse_checksum();
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@ -291,10 +322,12 @@ int CmdAnalyseCHKSUM(const char *Cmd){
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//Validations
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if(errors) return usage_analyse_checksum();
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PrintAndLog(" add | sub | add 1's compl | sub 1's compl | xor");
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PrintAndLog("byte nibble crumb | byte nibble | byte nibble cumb | byte nibble | byte nibble cumb");
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PrintAndLog("------------------+-------------+------------------+-----------------+--------------------");
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PrintAndLog("0x%02X 0x%02X 0x%02X | 0x%02X 0x%02X | 0x%02X 0x%02X 0x%02X | 0x%02X 0x%02X | 0x%02X 0x%02X 0x%02X",
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if (useHeader) {
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PrintAndLog(" add | sub | add 1's compl | sub 1's compl | xor");
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PrintAndLog("byte nibble crumb | byte nibble | byte nibble cumb | byte nibble | byte nibble cumb | BSD");
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PrintAndLog("------------------+-------------+------------------+-----------------+--------------------");
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}
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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",
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calcSumByteAdd(data, len, mask)
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, calcSumNibbleAdd(data, len, mask)
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, calcSumCrumbAdd(data, len, mask)
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@ -308,6 +341,8 @@ int CmdAnalyseCHKSUM(const char *Cmd){
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, calcSumByteXor(data, len, mask)
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, calcSumNibbleXor(data, len, mask)
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, calcSumCrumbXor(data, len, mask)
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, calcBSDchecksum8(data, len, mask)
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, calcBSDchecksum4(data, len, mask)
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);
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return 0;
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}
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