Hawkynt

RC6-512 (DarkCrypt)

RC6 variant from the DarkCrypt Total Commander plugin: standard 128-bit block, 20 rounds, extended to a 512-bit (64-byte) key. The key schedule packs each 4-byte key group big-endian (vs. textbook little-endian); the data block itself remains little-endian. 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	Ron Rivest, Matt Robshaw, Ray Sidney, Yiqun Lisa Yin; DarkCrypt variant by Alexander Myasnikov
Year	1998
Origin	🇷🇺 Russia
Source	algorithms/block/darkcrypt-rc6-512.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
Non-standard key extension	512-bit key size and big-endian key-byte packing are a non-standard, unanalyzed extension of RC6.	Use AES or another vetted cipher.

Documentation

• DarkCrypt plugin (Total Commander PlugRing)
• RC6 Algorithm Specification

Test vectors

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

Vector 1 — DarkCrypt Rc6-512 — zero key/plaintext

Field	Value
key	00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000
input	00000000000000000000000000000000
expected	89353321da8ac0abf854ded7d845134b

Vector 2 — DarkCrypt Rc6-512 — incrementing key/plaintext

Field	Value
key	000102030405060708090a0b0c0d0e0f 101112131415161718191a1b1c1d1e1f 202122232425262728292a2b2c2d2e2f 303132333435363738393a3b3c3d3e3f
input	000102030405060708090a0b0c0d0e0f
expected	896e6b581c0d1a85607052b240b2f707

Vector 3 — DarkCrypt Rc6-512 — shifted incrementing key/plaintext

Field	Value
key	0102030405060708090a0b0c0d0e0f10 1112131415161718191a1b1c1d1e1f20 2122232425262728292a2b2c2d2e2f30 3132333435363738393a3b3c3d3e3f40
input	101112131415161718191a1b1c1d1e1f
expected	9f384a095e48086ebdb02763ad0e66c4

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