Update legbrute for even threads

Updated legbrute to use an even number of threads and display the starting key of every key block. Useful in case the operation needs to be halted and resumed

client/src/cmdhficlass.c

@@ -3937,7 +3937,7 @@ static int CmdHFiClassLegRecLookUp(const char *Cmd) {
         arg_str1(NULL, "csn", "<hex>", "Specify CSN as 8 hex bytes"),
         arg_str1(NULL, "epurse", "<hex>", "Specify ePurse as 8 hex bytes"),
         arg_str1(NULL, "macs", "<hex>", "MACs"),
-        arg_str1(NULL, "pk", "<hex>", "Partial Key"),
+        arg_str1(NULL, "pk", "<hex>", "Partial Key from legrec or starting key of keyblock from legbrute"),
         arg_param_end
     };
     CLIExecWithReturn(ctx, Cmd, argtable, false);
@@ -4009,7 +4009,7 @@ static int CmdHFiClassLegRecLookUp(const char *Cmd) {
     PrintAndLogEx(SUCCESS, "Starting Key: %s", sprint_hex(startingKey, 8));
 
     uint32_t keycount = 1000000;
-    uint32_t keys_per_thread = 200000;
+    uint32_t keys_per_thread = 250000;
     uint32_t num_threads = keycount / keys_per_thread;
     pthread_t threads[num_threads];
     ThreadData thread_data[num_threads];
@@ -4057,8 +4057,11 @@ static int CmdHFiClassLegRecLookUp(const char *Cmd) {
             return PM3_EINVARG;
         }
 
-        PrintAndLogEx(INFO, "Generating diversified keys...");
+        PrintAndLogEx(INFO, "Generating diversified keys...Index: " _YELLOW_("%d")" of ~1099511",block_index);
         for (uint32_t t = 0; t < num_threads; t++) {
+            if(!t){
+                PrintAndLogEx(SUCCESS, "KeyBlock Starting Key: %s", sprint_hex(thread_data[t].keyBlock[0], 8));
+            }
             GenerateMacKeyFrom(csn, CCNR, true, false, (uint8_t *)thread_data[t].keyBlock, keys_per_thread, prekey + (block_index * keycount) + (t * keys_per_thread));
         }