yescrypt_crack - Yescrypt Hash Cracker

cyclone

Title: Yescrypt Hash Cracker
Author: cyclone
URL: https://github.com/cyclone-github/yescrypt_crack
Description:

./yescrypt_crack.bin -h hash.txt -w wordlist.txt
 -------------------------------------------------- 
|            Cyclone's Yescrypt Cracker            |
| https://github.com/cyclone-github/yescrypt_crack |
 -------------------------------------------------- 

Hash file:      hash.txt
Total Hashes:   26
CPU Threads:    56
Wordlist:       wordlist.txt
Backend:        auto
GPU selection:  all
GPU batch:      1280
2026/08/20 11:54:25 Counting wordlist lines...
2026/08/20 11:54:25 Tuning GPU...
2026/08/20 11:54:26 OpenCL GPU 0: NVIDIA GeForce RTX 4090, 23.5 GiB VRAM, batch cap 1280, self-test passed
2026/08/20 11:54:26 OpenCL GPU 1: NVIDIA GeForce RTX 4090, 23.5 GiB VRAM, batch cap 1280, self-test passed
2026/08/20 11:54:26 Working...
2026/08/20 11:55:26 Cracked: 0/26  7338.51 H/s	01m:00s/--
2026/08/20 11:56:26 Cracked: 0/26  7391.90 H/s	02m:00s/--
2026/08/20 11:57:26 Cracked: 0/26  7416.85 H/s	03m/1d:17h:06m
2026/08/20 11:58:26 Cracked: 0/26  7434.64 H/s	04m/1d:20h:21m
2026/08/20 11:59:26 Cracked: 0/26  7441.04 H/s	05m/1d:13h:26m

Info:

I originally wrote this tool in 2025 since yescrypt had become the default shadow hash for many popular Linux distros such as Debian, Ubuntu, RHEL, Fedora, Arch, etc, and due to the very limited hash cracking tools that supported yescrypt at that time.

yescrypt_crack supports OpenCL GPU acceleration for yescrypt and gost-yescrypt. GPU mode is used by default when a supported OpenCL GPU is available, and CPU mode is avaialble by using flag -cpu. All R&D has been performed on Debian 12/13 Linux. Cross platform support for Windows has been implemented, but is not guaranteed. For best results, Linux is recommended. Mac is not supported from v0.4.0 onward, but is supported on v0.3.1.

Example hash:plain:

$y$j9T$ss392e/1r/sS364AbKyZU1$Z6lrn5PE2YqIDbgeH590BnPC5fP8BFrkRgOhvo8WKVC:yescrypt_crack
$gy$j9T$pFEYYB6sbVC37XBX.uMqK/$xY/CaU3ESVzvfR9YErup5kUn2FiHSOoqgAx1zUA99u1:yescrypt_crack

Supported options:

-w {wordlist} (omit -w to read from stdin)
-h {yescrypt_hash_file}
-o {output} (omit -o to write to stdout)
-t {cpu threads} (selects CPU mode)
-s {print status every nth sec}
-gpu [all|0,1|list] (default: all GPUs; omit value to use all GPUs)
-cpu (force CPU mode)
-b {gpu batch size} (optional; 0 = auto)

-version (version info)
-help (usage instructions)

Examples:

./yescrypt_crack.bin -h hashes.txt -w wordlist.txt -o found.txt

./yescrypt_crack.bin -h hashes.txt -w wordlist.txt -gpu

./yescrypt_crack.bin -h hashes.txt -w wordlist.txt -gpu 0,1

./yescrypt_crack.bin -h hashes.txt -w wordlist.txt -gpu 0,1 -b 1280 -s 10 

./yescrypt_crack.bin -h hashes.txt -w wordlist.txt -cpu -t 16 -s 10

cat wordlist | ./yescrypt_crack.bin -h hashes.txt

./yescrypt_crack.bin -gpu list

For backwards compatibility, explicitly specifying -cpu selects CPU mode.

Credits:

yescrypt_crack was written by cyclone in Go
The yescrypt algorithm was designed by Solar Designer: https://www.openwall.com/yescrypt/
The CPU yescrypt implementation in yescrypt_cpu.go is adapted from openwall/yescrypt-go: https://github.com/openwall/yescrypt-go
The GPU SMix/PWX implementation in kernels/yescrypt.cl are adapted from hashcat's yescrypt OpenCL implementation: https://github.com/hashcat/hashcat/blob/master/OpenCL/inc_hash_yescrypt.cl
Streebog-256 is provided by github.com/tarantool/go-gostcrypto/streebog.
See THIRD_PARTY_NOTICES.md for upstream copyright notices and license terms.

Changelog:

https://github.com/cyclone-github/yescrypt_crack/blob/main/CHANGELOG.md

cyclone

Source code v0.2.0; 2025-03-06 uploaded to GitHub.
https://github.com/cyclone-github/yescrypt_crack

cyclone

Release v0.3.1; 2026-08-08
https://github.com/cyclone-github/yescrypt_crack/releases/tag/v0.3.1

add gost-yescrypt support

cyclone

v0.4.0-dev adds OpenCL support. Thanks to @64nickel for testing on his 12x 4090 cluster.
https://infosec.exchange/@cyclone/117134021102477783

hashpwn