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+--- Thread: Issue with ChaCha20 (/thread-8710.html)
Issue with ChaCha20 - Mem5 - 10-11-2019
Hi,
Trying to crack the sample ChaCha20 hash from the source code :
Code:
static const char *ST_PASS = "hashcat";
static const char *ST_HASH = "$chacha20$*0400000000000003*35*0200000000000001*3961626364656667*8a152c57a7a856a8";Code:
hashcat -m 15400 cha.hash wdlist.txtCode:
Status...........: Exhausted
Hash.Name........: ChaCha20
Hash.Target......: $chacha20$*0400000000000003*35*0200000000000001*3961626364656667*8a152c57a7a856a8
Guess.Queue......: 1/1 (100.00%)
Speed.#1.........: 0 H/s (0.00ms) @ Accel:128 Loops:1 Thr:1024 Vec:1
Speed.#*.........: 0 H/s
Recovered........: 0/1 (0.00%) Digests
Progress.........: 1/1 (100.00%)
Rejected.........: 1/1 (100.00%)
...Why Rejected.........: 1/1 (100.00%) ?
Same result on hashcat v5.1.0 and beta 5.1.0+1394.
Same result with the hash from samlple page https://hashcat.net/wiki/doku.php?id=example_hashes
Thanks.
RE: Issue with ChaCha20 - philsmd - 10-12-2019
hmm, I see the problem here. it's not very clear what is going on (at least for the general hashcat user ! )
The key in theory is always 32 bytes, but it's neither mentioned within the example wiki page, nor is the ST_PASS in src/modules/module_15400.c correctly reflecting this fact (even though module_pw_min () and module_pw_max () set the password length to 32 fixed (but "hashcat" is used for ST_PASS).
for now this password will work:
$HEX[6861736863617400000000000000000000000000000000000000000000000000]
i.e. "hashcat" but expanded to 32 bytes with NUL bytes appended (up to 32 bytes)
Since the code is able to do the expansion internally, we should just set pw_min to 0 i.e. in module_pw_min (), or skip it entirely since the default minimum password is zero.
We probably need a github issue for this mentioning to remove the pw_min restriction.
RE: Issue with ChaCha20 - Mem5 - 10-12-2019
Got it.
Thanks, I've created a github issue : https://github.com/hashcat/hashcat/issues/2199