Hawkynt

GTEA 2.1 (DarkCrypt)

Generalized TEA-family block cipher from the DarkCrypt Total Commander plugin: 4-branch generalized Feistel network with an embedded 64x256-byte S-box, 16 rounds, 64-word per-key round schedule. 128-bit block, 512-bit key.

Properties

Property Value
Category Block Ciphers
Sub-category Block Cipher
Security status 🎓 Educational Only
Complexity Expert
Inventor Alexander Myasnikov (DarkCrypt / “Zarya” project)
Year 2013
Origin 🇷🇺 Russia
Source algorithms/block/darkcrypt-gtea21.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, unanalyzed design Custom generalized Feistel network with no public cryptanalysis; not recommended for real use. 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 Gtea2 — zero key/plaintext

Field Value
key 00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000
input 00000000000000000000000000000000
expected a4cd835ff232ad41f399642beaccc307

Vector 2 — DarkCrypt Gtea2 — incrementing key/plaintext

Field Value
key 000102030405060708090a0b0c0d0e0f 101112131415161718191a1b1c1d1e1f 202122232425262728292a2b2c2d2e2f 303132333435363738393a3b3c3d3e3f
input 000102030405060708090a0b0c0d0e0f
expected a4d8c0077f7dc651642d49b6348d0846

Vector 3 — DarkCrypt Gtea2 — shifted incrementing key/plaintext

Field Value
key 0102030405060708090a0b0c0d0e0f10 1112131415161718191a1b1c1d1e1f20 2122232425262728292a2b2c2d2e2f30 3132333435363738393a3b3c3d3e3f40
input 101112131415161718191a1b1c1d1e1f
expected 43dc0b53b218e42f912afa2ff48c39c0

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