Hawkynt

Pomaranch (DarkCrypt)

Cascade Jump Controlled Sequence Generator (CJCSG), the 128-bit-key stream cipher behind Pomaranch: nine cascaded jump registers whose cells switch between shift and feedback roles under a key-dependent nonlinear filter, producing keystream as the XOR of a fixed tap across all sections.

Properties

Property	Value
Category	Stream Ciphers
Sub-category	Stream Cipher
Security status	🎓 Educational Only
Complexity	Advanced
Inventor	Cees J.A. Jansen, Tor Helleseth, Alexander Kholosha
Year	2005
Origin	🇳🇴 Norway
Source	algorithms/stream/darkcrypt-pomaranch.js

Parameters

Parameter	Supported values
Key sizes	16 bytes (128 bits)
Nonce sizes	14 bytes (112 bits)

Security

Status: 🎓 Educational Only

No vulnerabilities are recorded for this implementation.

Documentation

• Cascade Jump Controlled Sequence Generator (CJCSG)
• eSTREAM Pomaranch Page

References

• DarkCrypt Total Commander plugin

Test vectors

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

Vector 1 — DarkCrypt Pomaranch - 128-bit key, zero IV keystream

Field	Value
key	000102030405060708090a0b0c0d0e0f
iv	0000000000000000000000000000
input	00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000
expected	e5d7f7c09b1f1d3f672216e3e3103fce 0619eb25cce07c03a2f8be6925248beb 5dd63ea00a03885b02c97b77aab437b9 b2642c0d78c5ddc443bc4a28032f7b44 1cc09ba2992b57b6074a370eee93503e fd988c1f2b873780f6afd0c662ee5730 648a969b2458be556a4371e1e0cd4b39 0cb028860b122db7b7116a243d56f448

Vector 2 — DarkCrypt Pomaranch - 128-bit key, zero IV, incrementing plaintext

Field	Value
key	000102030405060708090a0b0c0d0e0f
iv	0000000000000000000000000000
input	000102030405060708090a0b0c0d0e0f 101112131415161718191a1b1c1d1e1f 202122232425262728292a2b2c2d2e2f 303132333435363738393a3b3c3d3e3f
expected	e5d6f5c39f1a1b386f2b1ce8ef1d31c1 1608f936d8f56a14bae1a472393995f4 7df71c832e26ae7c2ae0515c86991996 82551e3e4cf0ebf37b8570133f12457b

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