Hawkynt

Hierocrypt-3 (DarkCrypt)

Hierocrypt-3, Toshiba’s NESSIE-submission nested-SPN block cipher, fixed to a 256-bit key (8 rounds, turning point 5) as used by the DarkCrypt Total Commander plugin. 128-bit block. Validated against Toshiba’s official specification.

Properties

Property Value
Category Block Ciphers
Sub-category Block Cipher
Security status 🎓 Educational Only
Complexity Advanced
Inventor Toshiba Corporation; DarkCrypt integration by Alexander Myasnikov
Year 2000
Origin 🇯🇵 Japan
Source algorithms/block/darkcrypt-hierocrypt3.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
Not selected by NESSIE Hierocrypt-3 was submitted to NESSIE but not selected for the final portfolio; cryptanalysis is comparatively limited. Use AES or another vetted, widely analyzed cipher.

Documentation

Test vectors

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

Vector 1 — Toshiba Hierocrypt-3 specification test data, 256-bit key

Field Value
key 11a180269a78dda4994746213b5a6dd6e34ffe0cc465d583aff66e1329419c94
input c16d7efca1cbafc7625cbe9c2593de2d
expected c86cd3b4a3185232e3457d638c6515c9

Vector 2 — DarkCrypt Hierocrypt-3 — zero key/plaintext

Field Value
key 0000000000000000000000000000000000000000000000000000000000000000
input 00000000000000000000000000000000
expected a509d3d04066cd974d72135b0b44f64c

Vector 3 — DarkCrypt Hierocrypt-3 — incrementing key/plaintext

Field Value
key 000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f
input 000102030405060708090a0b0c0d0e0f
expected b1921a8d0f1a281b0f7660064c586279

Vector 4 — DarkCrypt Hierocrypt-3 — shifted incrementing key/plaintext

Field Value
key 0102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f20
input 101112131415161718191a1b1c1d1e1f
expected e220dfc4b0b3e8464b518f9cb48038f2

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