made a multi threaded version of ht2crack2search since the file lookups should benefit from it. In the friendly competition with @mwalker33 where I think his version beats mine

CHANGELOG.md

@@ -3,6 +3,7 @@ All notable changes to this project will be documented in this file.
 This project uses the changelog in accordance with [keepchangelog](http://keepachangelog.com/). Please use this to write notable changes, which is not the same as git commit log...
 
 ## [unreleased][unreleased]
+- Added a multi-threaded of ht2crack2search (@iceman1001)
 - Fixed ISO14443a bounds-checking because @doegex found cards not following ISO14443a when fuzzed (@iceman1001)
 - Added `mfkey32nested`: recovering partial nested authentication with known nT (@doegox)
 - Added support for dumping FM11RF08S data at once (@doegox)

tools/hitag2crack/crack2/Makefile

@@ -5,7 +5,7 @@ MYCFLAGS = -D_GNU_SOURCE
 MYDEFS =
 MYLDLIBS = -lpthread
 
-BINS = ht2crack2buildtable ht2crack2search ht2crack2gentest
+BINS = ht2crack2buildtable ht2crack2search ht2crack2gentest ht2crack2search_multi
 INSTALLTOOLS = $(BINS)
 
 include ../../../Makefile.host
@@ -20,3 +20,4 @@ endif
 ht2crack2buildtable : $(OBJDIR)/ht2crack2buildtable.o $(MYOBJS)
 ht2crack2search : $(OBJDIR)/ht2crack2search.o $(MYOBJS)
 ht2crack2gentest : $(OBJDIR)/ht2crack2gentest.o $(MYOBJS)
+ht2crack2search_multi : $(OBJDIR)/ht2crack2search_multi.o $(MYOBJS)