Hawkynt

Sobbikashi (DarkCrypt)

128-bit block, 512-bit key cipher from the DarkCrypt Total Commander plugin. A CAST-256-shaped generalized Feistel network (standard Type1/2/3 F-functions and S-boxes) run for 14 quad-rounds with a custom 512-bit key schedule.

Properties

Property	Value
Category	Block Ciphers
Sub-category	Block Cipher
Security status	🎓 Educational Only
Complexity	Expert
Inventor	Alexander Myasnikov (DarkCrypt / “Zarya” project)
Year	2009
Origin	🇷🇺 Russia
Source	algorithms/block/darkcrypt-sobbikashi.js

Parameters

Parameter	Supported values
Key sizes	64 bytes (512 bits)
Block sizes	16 bytes (128 bits)

Security

Status: 🎓 Educational Only

Known vulnerabilities

Issue	Description	Mitigation
Unanalyzed non-standard construction	Uses CAST-256’s public round-function formulas but with a non-standard round count and a custom, unanalyzed 512-bit key schedule with unused (always-zero) subkey slots for the first six quad-rounds.	Use AES or another vetted cipher.

Documentation

• DarkCrypt plugin (Total Commander PlugRing)
• CAST-256 (RFC 2612) - the round-function family this cipher borrows from

Test vectors

3 vectors ship with this algorithm and run in the test suite. Byte values are hexadecimal.

Vector 1 — DarkCrypt Sobbikashi — zero key/plaintext

Field	Value
key	00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000
input	00000000000000000000000000000000
expected	76c519ced2629aa405fa4f8bd08618c1

Vector 2 — DarkCrypt Sobbikashi — incrementing key/plaintext

Field	Value
key	000102030405060708090a0b0c0d0e0f 101112131415161718191a1b1c1d1e1f 202122232425262728292a2b2c2d2e2f 303132333435363738393a3b3c3d3e3f
input	000102030405060708090a0b0c0d0e0f
expected	fbb5cefcc945ba334ed378109f8a503d

Vector 3 — DarkCrypt Sobbikashi — shifted incrementing key/plaintext

Field	Value
key	0102030405060708090a0b0c0d0e0f10 1112131415161718191a1b1c1d1e1f20 2122232425262728292a2b2c2d2e2f30 3132333435363738393a3b3c3d3e3f40
input	101112131415161718191a1b1c1d1e1f
expected	8779a3bc256932680273875f4c9861f7

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