ADD: found a BCARD KeyB on the net. ref: http://irq5.io/2013/04/13/decoding-bcard...

[proxmark3-svn] / armsrc / BigBuf.c

diff --git a/armsrc/BigBuf.c b/armsrc/BigBuf.c
index 7f56e9a014290c1a4b60cbfbacfc49bc9b8da02d..2fb50a47ea2e4cee910a84c333f4f90d28153ece 100644 (file)
--- a/armsrc/BigBuf.c
+++ b/armsrc/BigBuf.c
@@ -26,10 +26,9 @@ static uint16_t BigBuf_hi = BIGBUF_SIZE;
 // pointer to the emulator memory.
 static uint8_t *emulator_memory = NULL;
 
-// trace related global variables
-// (only one left). ToDo: make this static as well?
-uint16_t traceLen = 0;
-
+// trace related variables
+static uint16_t traceLen = 0;
+int tracing = 1; //Last global one.. todo static?
 
 // get the address of BigBuf
 uint8_t *BigBuf_get_addr(void)
@@ -95,3 +94,149 @@ uint16_t BigBuf_max_traceLen(void)
 {
        return BigBuf_hi;
 }
+
+void clear_trace() {
+       uint8_t *trace = BigBuf_get_addr();
+       uint16_t max_traceLen = BigBuf_max_traceLen();
+       memset(trace, 0x44, max_traceLen);
+       traceLen = 0;
+}
+
+void set_tracing(bool enable) {
+       tracing = enable;
+}
+
+/**
+ * Get the number of bytes traced
+ * @return
+ */
+uint16_t BigBuf_get_traceLen(void)
+{
+       return traceLen;
+}
+
+/**
+  This is a function to store traces. All protocols can use this generic tracer-function.
+  The traces produced by calling this function can be fetched on the client-side
+  by 'hf list raw', alternatively 'hf list <proto>' for protocol-specific
+  annotation of commands/responses.
+
+**/
+bool RAMFUNC LogTrace(const uint8_t *btBytes, uint16_t iLen, uint32_t timestamp_start, uint32_t timestamp_end, uint8_t *parity, bool readerToTag)
+{
+       if (!tracing) return FALSE;
+
+       uint8_t *trace = BigBuf_get_addr();
+
+       uint16_t num_paritybytes = (iLen-1)/8 + 1;      // number of valid paritybytes in *parity
+       uint16_t duration = timestamp_end - timestamp_start;
+
+       // Return when trace is full
+       uint16_t max_traceLen = BigBuf_max_traceLen();
+
+       if (traceLen + sizeof(iLen) + sizeof(timestamp_start) + sizeof(duration) + num_paritybytes + iLen >= max_traceLen) {
+               tracing = FALSE;        // don't trace any more
+               return FALSE;
+       }
+       // Traceformat:
+       // 32 bits timestamp (little endian)
+       // 16 bits duration (little endian)
+       // 16 bits data length (little endian, Highest Bit used as readerToTag flag)
+       // y Bytes data
+       // x Bytes parity (one byte per 8 bytes data)
+
+       // timestamp (start)
+       trace[traceLen++] = ((timestamp_start >> 0) & 0xff);
+       trace[traceLen++] = ((timestamp_start >> 8) & 0xff);
+       trace[traceLen++] = ((timestamp_start >> 16) & 0xff);
+       trace[traceLen++] = ((timestamp_start >> 24) & 0xff);
+
+       // duration
+       trace[traceLen++] = ((duration >> 0) & 0xff);
+       trace[traceLen++] = ((duration >> 8) & 0xff);
+
+       // data length
+       trace[traceLen++] = ((iLen >> 0) & 0xff);
+       trace[traceLen++] = ((iLen >> 8) & 0xff);
+
+       // readerToTag flag
+       if (!readerToTag) {
+               trace[traceLen - 1] |= 0x80;
+       }
+
+       // data bytes
+       if (btBytes != NULL && iLen != 0) {
+               memcpy(trace + traceLen, btBytes, iLen);
+       }
+       traceLen += iLen;
+
+       // parity bytes
+       if (iLen != 0) {
+               if (parity != NULL) {
+               memcpy(trace + traceLen, parity, num_paritybytes);
+               } else {
+                       memset(trace + traceLen, 0x00, num_paritybytes);
+               }
+       }
+       traceLen += num_paritybytes;
+
+       return TRUE;
+}
+
+
+int LogTraceHitag(const uint8_t * btBytes, int iBits, int iSamples, uint32_t dwParity, int readerToTag)
+{
+       /**
+         Todo, rewrite the logger to use the generic functionality instead. It should be noted, however,
+         that this logger takes number of bits as argument, not number of bytes.
+         **/
+
+       if (!tracing) return FALSE;
+
+       uint8_t *trace = BigBuf_get_addr();
+       uint16_t iLen = nbytes(iBits);
+       // Return when trace is full
+       if (traceLen + sizeof(rsamples) + sizeof(dwParity) + sizeof(iBits) + iLen > BigBuf_max_traceLen()) return FALSE;
+
+       //Hitag traces appear to use this traceformat:
+       // 32 bits timestamp (little endian,Highest Bit used as readerToTag flag)
+       // 32 bits parity
+       // 8 bits size (number of bits in the trace entry, not number of bytes)
+       // y Bytes data
+
+       rsamples += iSamples;
+       trace[traceLen++] = ((rsamples >> 0) & 0xff);
+       trace[traceLen++] = ((rsamples >> 8) & 0xff);
+       trace[traceLen++] = ((rsamples >> 16) & 0xff);
+       trace[traceLen++] = ((rsamples >> 24) & 0xff);
+
+       if (!readerToTag) {
+               trace[traceLen - 1] |= 0x80;
+       }
+
+       trace[traceLen++] = ((dwParity >> 0) & 0xff);
+       trace[traceLen++] = ((dwParity >> 8) & 0xff);
+       trace[traceLen++] = ((dwParity >> 16) & 0xff);
+       trace[traceLen++] = ((dwParity >> 24) & 0xff);
+       trace[traceLen++] = iBits;
+
+       memcpy(trace + traceLen, btBytes, iLen);
+       traceLen += iLen;
+
+       return TRUE;
+}
+
+
+// Emulator memory
+uint8_t emlSet(uint8_t *data, uint32_t offset, uint32_t length){
+       uint8_t* mem = BigBuf_get_EM_addr();
+       if(offset+length < CARD_MEMORY_SIZE)
+       {
+               memcpy(mem+offset, data, length);
+               return 0;
+       }else
+       {
+               Dbprintf("Error, trying to set memory outside of bounds! %d  > %d", (offset+length), CARD_MEMORY_SIZE);
+               return 1;
+       }
+}