Hawkynt

Anubis-256 (DarkCrypt)

Original (pre-tweak) Anubis block cipher, 256-bit key (N=8, R=16 rounds). Involutional SPN with byte substitution and MDS diffusion, using Barreto’s original NESSIE-submission S-box. As implemented in the DarkCrypt Total Commander plugin.

Properties

Property	Value
Category	Block Ciphers
Sub-category	Block Cipher
Security status	🎓 Educational Only
Complexity	Intermediate
Inventor	Vincent Rijmen, Paulo S.L.M. Barreto; DarkCrypt integration by Alexander Myasnikov
Year	2000
Origin	🇷🇺 Russia
Source	algorithms/block/darkcrypt-anubis256.js

Parameters

Parameter	Supported values
Key sizes	32 bytes (256 bits)
Block sizes	16 bytes (128 bits)

Security

Status: 🎓 Educational Only

Known vulnerabilities

Issue	Description	Mitigation
Related-key weakness	The original (pre-tweak) Anubis S-box construction was later replaced by a tweaked variant that removes a related-key weakness. This implementation intentionally reproduces the original, weaker S-box for DarkCrypt compatibility.	Use the tweaked Anubis variant or another vetted cipher.

Documentation

• DarkCrypt plugin (Total Commander PlugRing)
• NESSIE Project - Anubis Specification

Test vectors

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

Vector 1 — NESSIE submission test vectors for the ORIGINAL (pre-tweak) Anubis, 256-bit key, set 1 vector 0

Field	Value
key	8000000000000000000000000000000000000000000000000000000000000000
input	00000000000000000000000000000000
expected	e086ac456b3ce513edf5dfddd63b7193

Vector 2 — DarkCrypt Anubis-256 — zero key/plaintext

Field	Value
key	0000000000000000000000000000000000000000000000000000000000000000
input	00000000000000000000000000000000
expected	05199928bb3546b5ff7b0765b89ec522

Vector 3 — DarkCrypt Anubis-256 — incrementing key/plaintext

Field	Value
key	000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f
input	000102030405060708090a0b0c0d0e0f
expected	78f573817a175592b362ea43b2f3c6fc

Vector 4 — DarkCrypt Anubis-256 — shifted incrementing key/plaintext

Field	Value
key	0102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f20
input	101112131415161718191a1b1c1d1e1f
expected	099b769adfd3aa1d26cff34e238e03da

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