mirror of
https://github.com/RfidResearchGroup/proxmark3.git
synced 2024-09-22 00:06:13 +08:00
263 lines
8.4 KiB
C
263 lines
8.4 KiB
C
//-----------------------------------------------------------------------------
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// Copyright (C) 2016 iceman
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//
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// This code is licensed to you under the terms of the GNU GPL, version 2 or,
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// at your option, any later version. See the LICENSE.txt file for the text of
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// the license.
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//-----------------------------------------------------------------------------
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// Analyse bytes commands
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//-----------------------------------------------------------------------------
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#include "cmdanalyse.h"
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static int CmdHelp(const char *Cmd);
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int usage_analyse_lcr(void) {
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PrintAndLog("Specifying the bytes of a UID with a known LRC will find the last byte value");
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PrintAndLog("needed to generate that LRC with a rolling XOR. All bytes should be specified in HEX.");
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PrintAndLog("");
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PrintAndLog("Usage: analyse lcr [h] <bytes>");
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PrintAndLog("Options:");
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PrintAndLog(" h This help");
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PrintAndLog(" <bytes> bytes to calc missing XOR in a LCR");
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PrintAndLog("");
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PrintAndLog("Samples:");
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PrintAndLog(" analyse lcr 04008064BA");
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PrintAndLog("expected output: Target (BA) requires final LRC XOR byte value: 5A");
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return 0;
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}
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int usage_analyse_checksum(void) {
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PrintAndLog("The bytes will be added with eachother and than limited with the applied mask");
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PrintAndLog("Finally compute ones' complement of the least significant bytes");
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PrintAndLog("");
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PrintAndLog("Usage: analyse chksum [h] b <bytes> m <mask>");
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PrintAndLog("Options:");
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PrintAndLog(" h This help");
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PrintAndLog(" b <bytes> bytes to calc missing XOR in a LCR");
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PrintAndLog(" m <mask> bit mask to limit the outpuyt");
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PrintAndLog("");
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PrintAndLog("Samples:");
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PrintAndLog(" analyse chksum b 137AF00A0A0D m FF");
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PrintAndLog("expected output: 0x61");
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return 0;
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}
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int usage_analyse_crc(void){
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PrintAndLog("A stub method to test different crc implementations inside the PM3 sourcecode. Just because you figured out the poly, doesn't mean you get the desired output");
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PrintAndLog("");
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PrintAndLog("Usage: analyse crc [h] <bytes>");
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PrintAndLog("Options:");
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PrintAndLog(" h This help");
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PrintAndLog(" <bytes> bytes to calc crc");
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PrintAndLog("");
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PrintAndLog("Samples:");
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PrintAndLog(" analyse crc 137AF00A0A0D");
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return 0;
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}
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static uint8_t calculateLRC( uint8_t* bytes, uint8_t len) {
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uint8_t LRC = 0;
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for (uint8_t i = 0; i < len; i++)
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LRC ^= bytes[i];
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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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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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sum += CRUMB(bytes[i], 2);
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sum += CRUMB(bytes[i], 4);
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sum += CRUMB(bytes[i], 6);
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}
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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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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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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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sum += NIBBLE_HIGH(bytes[i]);
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}
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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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return ~calcSumNibbleAdd(bytes, len, mask);
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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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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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// Ones complement
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static uint8_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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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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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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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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sum -= NIBBLE_HIGH(bytes[i]);
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}
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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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return ~calcSumNibbleSub(bytes, len, mask);
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}
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int CmdAnalyseLCR(const char *Cmd) {
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uint8_t data[50];
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char cmdp = param_getchar(Cmd, 0);
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if (strlen(Cmd) == 0|| cmdp == 'h' || cmdp == 'H') return usage_analyse_lcr();
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int len = 0;
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param_gethex_ex(Cmd, 0, data, &len);
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if ( len%2 ) return usage_analyse_lcr();
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len >>= 1;
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uint8_t finalXor = calculateLRC(data, len);
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PrintAndLog("Target [%02X] requires final LRC XOR byte value: 0x%02X",data[len-1] ,finalXor);
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return 0;
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}
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int CmdAnalyseCRC(const char *Cmd) {
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char cmdp = param_getchar(Cmd, 0);
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if (strlen(Cmd) == 0 || cmdp == 'h' || cmdp == 'H') return usage_analyse_crc();
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int len = strlen(Cmd);
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if ( len & 1 ) return usage_analyse_crc();
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// add 1 for null terminator.
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uint8_t *data = malloc(len+1);
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if ( data == NULL ) return 1;
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if ( param_gethex(Cmd, 0, data, len)) {
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free(data);
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return usage_analyse_crc();
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}
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len >>= 1;
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//PrintAndLog("\nTests with '%s' hex bytes", sprint_hex(data, len));
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PrintAndLog("\nTests of reflection. Two current methods in source code");
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PrintAndLog(" reflect(0x3e23L,3) is %04X == 0x3e26", reflect(0x3e23L,3) );
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PrintAndLog(" SwapBits(0x3e23L,3) is %04X == 0x3e26", SwapBits(0x3e23L,3) );
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PrintAndLog(" 0xB400 == %04X", reflect( (1 << 16 | 0xb400),16) );
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//
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// Test of CRC16, '123456789' string.
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//
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PrintAndLog("\nTests with '123456789' string");
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uint8_t dataStr[] = { 0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39 };
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uint8_t legic8 = CRC8Legic(dataStr, sizeof(dataStr));
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PrintAndLog("LEGIC: CRC16: %X", CRC16Legic(dataStr, sizeof(dataStr), legic8));
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//these below has been tested OK.
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PrintAndLog("Confirmed CRC Implementations");
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PrintAndLog("LEGIC: CRC8 : %X (0xC6 expected)", legic8);
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PrintAndLog("MAXIM: CRC8 : %X (0xA1 expected)", CRC8Maxim(dataStr, sizeof(dataStr)));
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PrintAndLog("DNP : CRC16: %X (0x82EA expected)", CRC16_DNP(dataStr, sizeof(dataStr)));
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PrintAndLog("CCITT: CRC16: %X (0xE5CC expected)", CRC16_CCITT(dataStr, sizeof(dataStr)));
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free(data);
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return 0;
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}
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int CmdAnalyseCHKSUM(const char *Cmd){
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uint8_t data[50];
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uint8_t cmdp = 0;
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uint32_t mask = 0xFF;
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bool errors = false;
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int len = 0;
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memset(data, 0x0, sizeof(data));
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while(param_getchar(Cmd, cmdp) != 0x00) {
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switch(param_getchar(Cmd, cmdp)) {
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case 'b':
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case 'B':
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param_gethex_ex(Cmd, cmdp+1, data, &len);
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if ( len%2 ) errors = true;
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len >>= 1;
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cmdp += 2;
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break;
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case 'm':
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case 'M':
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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 'h':
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case 'H':
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return usage_analyse_checksum();
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default:
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PrintAndLog("Unknown parameter '%c'", param_getchar(Cmd, cmdp));
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errors = true;
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break;
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}
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if(errors) break;
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}
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//Validations
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if(errors) return usage_analyse_checksum();
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PrintAndLog("\nByte Add | 0x%X", calcSumByteAdd(data, len, mask));
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PrintAndLog("Nibble Add | 0x%X", calcSumNibbleAdd(data, len, mask));
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PrintAndLog("Crumb Add | 0x%X", calcSumCrumbAdd(data, len, mask));
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PrintAndLog("\nByte Subtract | 0x%X", calcSumByteSub(data, len, mask));
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PrintAndLog("Nibble Subtract | 0x%X", calcSumNibbleSub(data, len, mask));
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PrintAndLog("\nCHECKSUM - One's complement");
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PrintAndLog("Byte Add | 0x%X", calcSumByteAddOnes(data, len, mask));
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PrintAndLog("Nibble Add | 0x%X", calcSumNibbleAddOnes(data, len, mask));
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PrintAndLog("Crumb Add | 0x%X", calcSumCrumbAddOnes(data, len, mask));
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PrintAndLog("Byte Subtract | 0x%X", calcSumByteSubOnes(data, len, mask));
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PrintAndLog("Nibble Subtract | 0x%X", calcSumNibbleSubOnes(data, len, mask));
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return 0;
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}
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int CmdAnalyseDates(const char *Cmd){
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// look for datestamps in a given array of bytes
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PrintAndLog("To be implemented. Feel free to contribute!");
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return 0;
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}
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static command_t CommandTable[] = {
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{"help", CmdHelp, 1, "This help"},
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{"lcr", CmdAnalyseLCR, 1, "Generate final byte for XOR LRC"},
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{"crc", CmdAnalyseCRC, 1, "Stub method for CRC evaluations"},
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{"chksum", CmdAnalyseCHKSUM, 1, "Checksum with adding, masking and one's complement"},
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{"dates", CmdAnalyseDates, 1, "Look for datestamps in a given array of bytes"},
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{NULL, NULL, 0, NULL}
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};
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int CmdAnalyse(const char *Cmd) {
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clearCommandBuffer();
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CmdsParse(CommandTable, Cmd);
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return 0;
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}
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int CmdHelp(const char *Cmd) {
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CmdsHelp(CommandTable);
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return 0;
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}
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