How do I crack substr hash?

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Here is a little code I wrote for your "problem": http://pastebin.com/Mmv7T9AD

In my tests I was able to crack/collide nearly every possible first-2^32-bit-MD5 hash in less then 15 minutes, no need for hashcat patch.

root@ht:~# time /root/maskprocessor-0.69/mp64.bin ?d?d?d?d?d?d?d?d?d?d?d?d?d?d | ./subhash aaaaaaaa
Password matches: 00003433277101

real 12m4.230s
user 12m9.510s
sys 1m3.508s

root@ht:~# time /root/maskprocessor-0.69/mp64.bin ?d?d?d?d?d?d?d?d?d?d?d?d?d?d | ./subhash deadbeef
Password matches: 00003428718063

real 10m6.153s
user 11m30.499s
sys 1m35.158s