Hawkynt

Shebamik (DarkCrypt)

160-bit block, 512-bit key cipher from the DarkCrypt Total Commander plugin. The SHA-1 compression function (five-word ARX state, ROTL5/ROTL30, Ch/Parity/Maj/Parity boolean functions, standard SHA-1 round constants) run as an 80-round keyed block cipher: an 80-word round-subkey schedule replaces SHA-1’s message schedule and the round update accumulates additively so the transform is invertible. ADD whitening before the rounds, XOR whitening after. RC6/Blowfish-style key schedule driven by a fixed substitution table feeding two chained RC4-style key schedules.

Properties

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

Parameters

Parameter Supported values
Key sizes 64 bytes (512 bits)
Block sizes 20 bytes (160 bits)

Security

Status: 🎓 Educational Only

Known vulnerabilities

Issue Description Mitigation
Obscure unanalyzed variant Non-standard SHA-1-derived block cipher construction with no public cryptanalysis. Use AES or another vetted cipher.

Documentation

Test vectors

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

Vector 1 — DarkCrypt Shebamik - zero key/plaintext

Field Value
key 00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000
input 0000000000000000000000000000000000000000
expected 8131febb310fdfec6f15093f3303554a853d10f9

Vector 2 — DarkCrypt Shebamik - incrementing key/plaintext

Field Value
key 000102030405060708090a0b0c0d0e0f 101112131415161718191a1b1c1d1e1f 202122232425262728292a2b2c2d2e2f 303132333435363738393a3b3c3d3e3f
input 000102030405060708090a0b0c0d0e0f10111213
expected a799446a556109c89206395da9d5fef887bd61c6

Vector 3 — DarkCrypt Shebamik - shifted incrementing key/plaintext

Field Value
key 0102030405060708090a0b0c0d0e0f10 1112131415161718191a1b1c1d1e1f20 2122232425262728292a2b2c2d2e2f30 3132333435363738393a3b3c3d3e3f40
input 101112131415161718191a1b1c1d1e1f20212223
expected 27ba0df9df9ec6df8b0486f517e9f480843d88e7

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