Fix 15 snoop (#752)

[proxmark3-svn] / client / cmdhf15.c

diff --git a/client/cmdhf15.c b/client/cmdhf15.c
index e5f4af31cc9fa08ae8029fa9726ec6fd8fc857f7..da83ccafd4b9b73b5d110121d39c4e085c585e5f 100644 (file)
--- a/client/cmdhf15.c
+++ b/client/cmdhf15.c
@@ -38,15 +38,54 @@
 #include "protocols.h"
 #include "cmdmain.h"
 
-#define FrameSOF              Iso15693FrameSOF
-#define Logic0                                         Iso15693Logic0
-#define Logic1                                         Iso15693Logic1
-#define FrameEOF                                       Iso15693FrameEOF
-
 #define Crc(data,datalen)     Iso15693Crc(data,datalen)
 #define AddCrc(data,datalen)  Iso15693AddCrc(data,datalen)
 #define sprintUID(target,uid)  Iso15693sprintUID(target,uid)
 
+// SOF defined as
+// 1) Unmodulated time of 56.64us
+// 2) 24 pulses of 423.75khz
+// 3) logic '1' (unmodulated for 18.88us followed by 8 pulses of 423.75khz)
+
+static const int Iso15693FrameSOF[] = {
+       -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+       -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+        1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,
+        1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,
+       -1, -1, -1, -1,
+       -1, -1, -1, -1,
+        1,  1,  1,  1,
+        1,  1,  1,  1
+};
+static const int Iso15693Logic0[] = {
+        1,  1,  1,  1,
+        1,  1,  1,  1,
+       -1, -1, -1, -1,
+       -1, -1, -1, -1
+};
+static const int Iso15693Logic1[] = {
+       -1, -1, -1, -1,
+       -1, -1, -1, -1,
+        1,  1,  1,  1,
+        1,  1,  1,  1
+};
+
+// EOF defined as
+// 1) logic '0' (8 pulses of 423.75khz followed by unmodulated for 18.88us)
+// 2) 24 pulses of 423.75khz
+// 3) Unmodulated time of 56.64us
+
+static const int Iso15693FrameEOF[] = {
+        1,  1,  1,  1,
+        1,  1,  1,  1,
+       -1, -1, -1, -1,
+       -1, -1, -1, -1,
+        1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,
+        1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,
+       -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+       -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1
+};
+
 // structure and database for uid -> tagtype lookups 
 typedef struct { 
        uint64_t uid;
@@ -293,8 +332,8 @@ int CmdHF15Demod(const char *Cmd)
        // First, correlate for SOF
        for (i = 0; i < 200; i++) {
                int corr = 0;
-               for (j = 0; j < arraylen(FrameSOF); j += skip) {
-                       corr += FrameSOF[j] * GraphBuffer[i + (j / skip)];
+               for (j = 0; j < arraylen(Iso15693FrameSOF); j += skip) {
+                       corr += Iso15693FrameSOF[j] * GraphBuffer[i + (j / skip)];
                }
                if (corr > max) {
                        max = corr;
@@ -302,28 +341,28 @@ int CmdHF15Demod(const char *Cmd)
                }
        }
        PrintAndLog("SOF at %d, correlation %d", maxPos,
-               max / (arraylen(FrameSOF) / skip));
+               max / (arraylen(Iso15693FrameSOF) / skip));
        
-       i = maxPos + arraylen(FrameSOF) / skip;
+       i = maxPos + arraylen(Iso15693FrameSOF) / skip;
        int k = 0;
        uint8_t outBuf[20];
        memset(outBuf, 0, sizeof(outBuf));
        uint8_t mask = 0x01;
        for (;;) {
                        int corr0 = 0, corr00 = 0, corr01 = 0, corr1 = 0, corrEOF = 0;
-                       for(j = 0; j < arraylen(Logic0); j += skip) {
-                               corr0 += Logic0[j]*GraphBuffer[i+(j/skip)];
+                       for(j = 0; j < arraylen(Iso15693Logic0); j += skip) {
+                               corr0 += Iso15693Logic0[j]*GraphBuffer[i+(j/skip)];
                        }
                        corr01 = corr00 = corr0;
-                       for(j = 0; j < arraylen(Logic0); j += skip) {
-                               corr00 += Logic0[j]*GraphBuffer[i+arraylen(Logic0)/skip+(j/skip)];
-                               corr01 += Logic1[j]*GraphBuffer[i+arraylen(Logic0)/skip+(j/skip)];
+                       for(j = 0; j < arraylen(Iso15693Logic0); j += skip) {
+                               corr00 += Iso15693Logic0[j]*GraphBuffer[i+arraylen(Iso15693Logic0)/skip+(j/skip)];
+                               corr01 += Iso15693Logic1[j]*GraphBuffer[i+arraylen(Iso15693Logic0)/skip+(j/skip)];
                        }
-                       for(j = 0; j < arraylen(Logic1); j += skip) {
-                               corr1 += Logic1[j]*GraphBuffer[i+(j/skip)];
+                       for(j = 0; j < arraylen(Iso15693Logic1); j += skip) {
+                               corr1 += Iso15693Logic1[j]*GraphBuffer[i+(j/skip)];
                        }
-                       for(j = 0; j < arraylen(FrameEOF); j += skip) {
-                               corrEOF += FrameEOF[j]*GraphBuffer[i+(j/skip)];
+                       for(j = 0; j < arraylen(Iso15693FrameEOF); j += skip) {
+                               corrEOF += Iso15693FrameEOF[j]*GraphBuffer[i+(j/skip)];
                        }
                        // Even things out by the length of the target waveform.
                        corr00 *= 2;
@@ -335,17 +374,17 @@ int CmdHF15Demod(const char *Cmd)
                                PrintAndLog("EOF at %d", i);
                                break;
                } else if (corr1 > corr0) {
-                       i += arraylen(Logic1) / skip;
+                       i += arraylen(Iso15693Logic1) / skip;
                        outBuf[k] |= mask;
                } else {
-                       i += arraylen(Logic0) / skip;
+                       i += arraylen(Iso15693Logic0) / skip;
                }
                mask <<= 1;
                if (mask == 0) {
                        k++;
                        mask = 0x01;
                }
-               if ((i + (int)arraylen(FrameEOF)) >= GraphTraceLen) {
+               if ((i + (int)arraylen(Iso15693FrameEOF)) >= GraphTraceLen) {
                        PrintAndLog("ran off end!");
                        break;
                }
@@ -374,10 +413,9 @@ int CmdHF15Read(const char *Cmd)
 }
 
 // Record Activity without enabling carrier
-// TODO: currently it DOES enable the carrier
-int CmdHF15Record(const char *Cmd)
+int CmdHF15Snoop(const char *Cmd)
 {
-       UsbCommand c = {CMD_RECORD_RAW_ADC_SAMPLES_ISO_15693};
+       UsbCommand c = {CMD_SNOOP_ISO_15693};
        SendCommand(&c);
        return 0;
 }
@@ -514,7 +552,7 @@ static command_t CommandTable15[] =
        {"help",    CmdHF15Help,    1, "This help"},
        {"demod",   CmdHF15Demod,   1, "Demodulate ISO15693 from tag"},
        {"read",    CmdHF15Read,    0, "Read HF tag (ISO 15693)"},
-       {"record",  CmdHF15Record,  0, "Record Samples (ISO 15693)"}, // atrox
+       {"snoop",   CmdHF15Snoop,   0, "Eavesdrop ISO 15693 communications"},
        {"reader",  CmdHF15Reader,  0, "Act like an ISO15693 reader"},
        {"sim",     CmdHF15Sim,     0, "Fake an ISO15693 tag"},
        {"cmd",     CmdHF15Cmd,     0, "Send direct commands to ISO15693 tag"},