AES-128 and Integer overflow detected in keyspace of mask

[strcmp]

Thanks for the fast response!

Actually, it's all hex. I forgot to mention in the OP (corrected).
Example of hashes.txt

Code:

45a32b45274d523f29528e53f4eea320:64b25e189238b3cc59e46e39ff726432

I also came up with 3.4e38 candidates.

What if I would know the first 2 (of the 16) bytes of the key?
This would reduce the candidates to 14.
What would be the mask syntax?