Hawkynt

DoubleKing

384-bit block cipher with 384-bit key using 32-bit words. BaseKing variant designed by Tim van Dijk for ARM architecture efficiency. Uses 11 rounds plus final transformation.

Properties

Property	Value
Category	Block Ciphers
Sub-category	Block Cipher
Security status	🧪 Experimental
Complexity	Advanced
Inventor	Tim van Dijk
Year	2017
Origin	🇳🇱 Netherlands
Source	algorithms/block/doubleking.js

Parameters

Parameter	Supported values
Key sizes	48 bytes (384 bits)
Block sizes	48 bytes (384 bits)

Security

Status: 🧪 Experimental

No vulnerabilities are recorded for this implementation.

Documentation

• Tim van Dijk’s Bachelor Thesis
• Joan Daemen’s Doctoral Dissertation — Cipher and hash function design strategies based on linear and differential cryptanalysis

References

• Joan Daemen Research Page
• Tim van Dijk’s Python Reference Implementation — DoubleKing.py from Bachelor thesis

Test vectors

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

Vector 1 — All zeros test vector

Source: Tim van Dijk’s Python reference implementation

Field	Value
key	00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000
input	00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000
expected	76eb5142993436915c1ee6a439b26f27 e84c37b317e80df0ae5519021e126855 4d76749ce0ff804a4ea3e77cd5870cd4

Vector 2 — All ones test vector

Source: Tim van Dijk’s Python reference implementation

Field	Value
key	ffffffffffffffffffffffffffffffff ffffffffffffffffffffffffffffffff ffffffffffffffffffffffffffffffff
input	ffffffffffffffffffffffffffffffff ffffffffffffffffffffffffffffffff ffffffffffffffffffffffffffffffff
expected	a8a0b4a183ea178ffb4a1d886cbb415a b7c81abf184f73658a8ab72fbad0b666 0ec77ba50c865d262c6cb47507920b60

Vector 3 — Sequential pattern test vector

Source: Tim van Dijk’s Python reference implementation

Field	Value
key	0102030405060708090a0b0c0d0e0f10 1112131415161718191a1b1c1d1e1f20 2122232425262728292a2b2c2d2e2f30
input	000102030405060708090a0b0c0d0e0f 101112131415161718191a1b1c1d1e1f 202122232425262728292a2b2c2d2e2f
expected	98c7ae8f9368cc678887c00509f089e3 62ef2f2ff303cfd17ea02296162eacb1 530310843b44c1cf15493998cb4af2b3

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