Modifiations to hash type 18100 to support binary seeds

[slothsec]

Hmm on further investigation this may not be possible since running 
"hashcat -m18100 -a3 -o totp.potfile totp.hashes -1 ABCDEFGHIJKLMNOPQRSTUVWXYZ234567 ?1?1?1?1?1?1?1?1?1?1?1?1?1?1?1?1 --force"

results in 
"Integer overflow detected in keyspace of mask: ?1?1?1?1?1?1?1?1?1?1?1?1?1?1?1?1"

Is there some other way to attack the non ascii/base32_decoded seed?