Hawkynt

Threefish-512-TW (DarkCrypt)

Threefish-512 as implemented in the DarkCrypt Total Commander plugin build “TW1.2”: standard 72-round/permutation/rotation/tweak structure, but with a non-standard key-schedule parity constant (0x5555555555555555). 512-bit block, 512-bit key + 128-bit tweak.

Properties

Property	Value
Category	Block Ciphers
Sub-category	Block Cipher
Security status	🎓 Educational Only
Complexity	Advanced
Inventor	Bruce Schneier, Niels Ferguson, Stefan Lucks, Doug Whiting, Mihir Bellare, Tadayoshi Kohno, Jon Callas, Jesse Walker (base Threefish); DarkCrypt variant by Alexander Myasnikov
Year	2008
Origin	🇷🇺 Russia
Source	algorithms/block/darkcrypt-threefish512tw.js

Parameters

Parameter	Supported values
Key sizes	80 bytes (640 bits)
Block sizes	64 bytes (512 bits)

Security

Status: 🎓 Educational Only

Known vulnerabilities

Issue	Description	Mitigation
Non-standard variant	Modified Threefish-512 with an unanalyzed key-schedule constant; unanalyzed and not recommended for real use.	Use AES or another vetted cipher.

Documentation

• DarkCrypt plugin (Total Commander PlugRing)
• The Skein Hash Function Family / Threefish specification

Test vectors

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

Vector 1 — DarkCrypt Threefish-512-tweak — zero key/tweak/plaintext

Field	Value
key	00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000
input	00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000
expected	54c48fea2dac72222c0380d1a1a9f768 4d47bd90fc491724dc599e1824b6b30a e22db97e841482db209c0e6974c2111a d6c691984919c11f987fc2d132379fb4

Vector 2 — DarkCrypt Threefish-512-tweak — incrementing key/tweak/plaintext

Field	Value
key	000102030405060708090a0b0c0d0e0f 101112131415161718191a1b1c1d1e1f 202122232425262728292a2b2c2d2e2f 303132333435363738393a3b3c3d3e3f 404142434445464748494a4b4c4d4e4f
input	000102030405060708090a0b0c0d0e0f 101112131415161718191a1b1c1d1e1f 202122232425262728292a2b2c2d2e2f 303132333435363738393a3b3c3d3e3f
expected	54eba34f9c4492af834cc2cb46ac1611 7e9100f6c3f9ec2240f22750038a0ff1 144bf2448bebcd6bc6919270a2a18322 091f60b4345a1c8a5538d57058a22def

Vector 3 — DarkCrypt Threefish-512-tweak — shifted incrementing key/tweak/plaintext

Field	Value
key	0102030405060708090a0b0c0d0e0f10 1112131415161718191a1b1c1d1e1f20 2122232425262728292a2b2c2d2e2f30 3132333435363738393a3b3c3d3e3f40 4142434445464748494a4b4c4d4e4f50
input	101112131415161718191a1b1c1d1e1f 202122232425262728292a2b2c2d2e2f 303132333435363738393a3b3c3d3e3f 404142434445464748494a4b4c4d4e4f
expected	95d7e6e756799a33da241d309d8f23ea 7b8436ac36380e90bfc8a3eac0ebcabe 302a0472ded6d94a97484fc7e02b21dc 95ad2fab5e85fd26547ebd2ff1a9ca47

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