mf 1k sim reader attack cleanup

[proxmark3-svn] / armsrc / util.c

diff --git a/armsrc/util.c b/armsrc/util.c
index 2d3aab9ca2a56703f4e50737e6f62eeb9cbe7ee9..1dd8dc7544fe1cb2989548692f8449f19b6ca621 100644 (file)
--- a/armsrc/util.c
+++ b/armsrc/util.c
@@ -12,9 +12,30 @@
 #include "util.h"
 #include "string.h"
 #include "apps.h"
+#include "BigBuf.h"
+
+
+
+void print_result(char *name, uint8_t *buf, size_t len) {
+   uint8_t *p = buf;
+
+   if ( len % 16 == 0 ) {
+          for(; p-buf < len; p += 16)
+       Dbprintf("[%s:%d/%d] %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x",
+                               name,
+                               p-buf,
+                               len,
+                               p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7],p[8], p[9], p[10], p[11], p[12], p[13], p[14], p[15]
+          );
+   }
+   else {
+   for(; p-buf < len; p += 8)
+       Dbprintf("[%s:%d/%d] %02x %02x %02x %02x %02x %02x %02x %02x", name, p-buf, len, p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7]);
+   }
+}
 
 size_t nbytes(size_t nbits) {
-       return (nbits/8)+((nbits%8)>0);
+       return (nbits >> 3)+((nbits % 8) > 0);
 }
 
 uint32_t SwapBits(uint32_t value, int nrbits) {
@@ -45,6 +66,26 @@ uint64_t bytes_to_num(uint8_t* src, size_t len)
        return num;
 }
 
+// RotateLeft - Ultralight, Desfire
+void rol(uint8_t *data, const size_t len){
+    uint8_t first = data[0];
+    for (size_t i = 0; i < len-1; i++) {
+        data[i] = data[i+1];
+    }
+    data[len-1] = first;
+}
+void lsl (uint8_t *data, size_t len) {
+    for (size_t n = 0; n < len - 1; n++) {
+        data[n] = (data[n] << 1) | (data[n+1] >> 7);
+    }
+    data[len - 1] <<= 1;
+}
+
+int32_t le24toh (uint8_t data[3])
+{
+    return (data[2] << 16) | (data[1] << 8) | data[0];
+}
+
 void LEDsoff()
 {
        LED_A_OFF();
@@ -225,17 +266,17 @@ void FormatVersionInformation(char *dst, int len, const char *prefix, void *vers
 {
        struct version_information *v = (struct version_information*)version_information;
        dst[0] = 0;
-       strncat(dst, prefix, len);
+       strncat(dst, prefix, len-1);
        if(v->magic != VERSION_INFORMATION_MAGIC) {
-               strncat(dst, "Missing/Invalid version information", len - strlen(dst) - 1);
+               strncat(dst, "Missing/Invalid version information\n", len - strlen(dst) - 1);
                return;
        }
        if(v->versionversion != 1) {
-               strncat(dst, "Version information not understood", len - strlen(dst) - 1);
+               strncat(dst, "Version information not understood\n", len - strlen(dst) - 1);
                return;
        }
        if(!v->present) {
-               strncat(dst, "Version information not available", len - strlen(dst) - 1);
+               strncat(dst, "Version information not available\n", len - strlen(dst) - 1);
                return;
        }
 
@@ -248,6 +289,7 @@ void FormatVersionInformation(char *dst, int len, const char *prefix, void *vers
 
        strncat(dst, " ", len - strlen(dst) - 1);
        strncat(dst, v->buildtime, len - strlen(dst) - 1);
+       strncat(dst, "\n", len - strlen(dst) - 1);
 }
 
 //  -------------------------------------------------------------------------
@@ -262,11 +304,12 @@ void FormatVersionInformation(char *dst, int len, const char *prefix, void *vers
 
 void StartTickCount()
 {
-//  must be 0x40, but on my cpu - included divider is optimal
-//  0x20 - 1 ms / bit 
-//  0x40 - 2 ms / bit
-
-       AT91C_BASE_RTTC->RTTC_RTMR = AT91C_RTTC_RTTRST + 0x001D; // was 0x003B
+       // This timer is based on the slow clock. The slow clock frequency is between 22kHz and 40kHz.
+       // We can determine the actual slow clock frequency by looking at the Main Clock Frequency Register.
+    uint16_t mainf = AT91C_BASE_PMC->PMC_MCFR & 0xffff;                // = 16 * main clock frequency (16MHz) / slow clock frequency
+       // set RealTimeCounter divider to count at 1kHz:
+       AT91C_BASE_RTTC->RTTC_RTMR = AT91C_RTTC_RTTRST | ((256000 + (mainf/2)) / mainf);
+       // note: worst case precision is approx 2.5%
 }
 
 /*
@@ -388,4 +431,3 @@ uint32_t RAMFUNC GetCountSspClk(){
        }
 }
 
-