Possibility for a workaround keyspace-calculation? reason inside

Possibility for a workaround keyspace-calculation? reason inside - Printable Version

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Possibility for a workaround keyspace-calculation? reason inside - Snoopy - 03-26-2021

regarding to this
https://hashcat.net/wiki/doku.php?id=frequently_asked_questions#what_is_a_keyspace

Code:
In other words, hashcat's --keyspace is specifically designed to optimize distribution of work, and is not a literal representation of the total possible keyspace for a given attack.

OKAY got it
but
in mode -a 3 it says

Code:
-a 3 – multiply the number of possible characters in each mask position for the base loop mask, excluding the mod loop mask – please just use --keyspace switch ;)

okay this is the reason for these numbers

Code:
mp64.exe --combinations ?a -> 95

hashcat --keyspace -a 3 ?a -> 1

mp64.exe --combinations ?a?a?a?a?a?a?a?a -> 6634204312890625

hashcat --keyspace -a 3 ?a?a?a?a?a?a?a?a -> 7737809375

so basically in -a 3 the keyspace should always? be smaller than the actual combinations, because of the excluded mod loop

BUT why maskprocessor is capable of doing things like

Code:
mp64.exe --combinations ?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a (24*?a)

11007294638326990593

BUT

hahscat fails on

hashcat --keyspace -a 3 ?a?a?a?a?a?a?a?a?a?a (10*?a)

Integer overflow detected in keyspace of mask: ?a?a?a?a?a?a?a?a?a?a

yeah i/we can feed hashcat from stdin with maskprocessor but is there a workaround to bypass this keyspace calculation problem?

RE: Possibility for a workaround keyspace-calculation? reason inside - Chick3nman - 03-27-2021

(03-26-2021, 11:56 AM)Snoopy Wrote:
Code:
mp64.exe --combinations ?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a?a (24*?a) 11007294638326990593 BUT hahscat fails on hashcat --keyspace -a 3 ?a?a?a?a?a?a?a?a?a?a (10*?a) Integer overflow detected in keyspace of mask: ?a?a?a?a?a?a?a?a?a?a

yeah i/we can feed hashcat from stdin with maskprocessor but is there a workaround to bypass this keyspace calculation problem?

This is not a problem. Your keyspace at the bottom there exceeds the size of a unsigned 32 bit integer, meaning hashcat is unable to store the keyspace in the format we have chosen for it. We COULD bump it up to 64 bit everywhere needed, though it would be a good bit of work i would think, but doing so makes no sense anyways. A keyspace as large as ?a*10 is very very rare to even be feasible, much less something you should ever be running. ?a*24 could not be completed in our fastest algorithm with all the computers on earth. It makes little sense to try and load keyspaces that large so for now, we have left the keyspace value limited to its current size.

RE: Possibility for a workaround keyspace-calculation? reason inside - Snoopy - 03-29-2021

i was just wondering when stumbling upon this twitter thread by Royce

https://twitter.com/tychotithonus/status/1314424307208970240

cracking a sha256 of length 10, okay it was not ?a, just ?l?u?d but quite close

the ?a*24 was just a test to see if maskprocessor also throw this error ( i know combinations are not the same like keyspace)