Hawkynt

Rabbit (DarkCrypt)

DarkCrypt port of the Rabbit stream cipher. Identical state machine to RFC 4503, but the keystream words are serialized in little-endian order instead of RFC 4503’s byte-swapped output format.

Properties

Property	Value
Category	Stream Ciphers
Sub-category	Stream Cipher
Security status	Not classified
Complexity	Intermediate
Inventor	Martin Boesgaard, Mette Vesterager, Thomas Pedersen, Jesper Christiansen, Ove Scavenius
Year	2003
Origin	Not specified
Source	algorithms/stream/darkcrypt-rabbit.js

Parameters

Parameter	Supported values
Key sizes	16 bytes (128 bits)
Block sizes	1 byte (8 bits) to 65536 bytes (524288 bits)

Security

Status: not classified — treat as unverified.

No vulnerabilities are recorded for this implementation.

Documentation

• RFC 4503 Specification
• eSTREAM Portfolio
• DarkCrypt plugin (Total Commander PlugRing)

References

• Cryptico Rabbit Reference Source (eSTREAM archive)
• DarkCrypt / Zarya Total Commander plugin

Test vectors

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

Vector 1 — DarkCrypt Rablib – sequential key/IV, 128 zero bytes

Field	Value
key	000102030405060708090a0b0c0d0e0f
iv	0000000000000000
input	00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000
expected	a8f7e69b6940a78d136a5c154a157952 a6e4235859e30220ea686436bb38ef53 9c2940556b09ecd7fea2b0ac8307f169 6265a3d644281c39c9cd5e1e2f9be4d0 0d482cb85a874aa55197d99f877c9d91 a1489eac8571e85bb7cd2a2d8ff4c183 b91f57377310fde711b6ecd2a8e98887 e1b3bcfbc0c29134e109c3b92dac44cd

Vector 2 — DarkCrypt Rablib – sequential key/IV, incrementing 64-byte input

Field	Value
key	000102030405060708090a0b0c0d0e0f
iv	0000000000000000
input	000102030405060708090a0b0c0d0e0f 101112131415161718191a1b1c1d1e1f 202122232425262728292a2b2c2d2e2f 303132333435363738393a3b3c3d3e3f
expected	a8f6e4986d45a18a1b63561e4618775d b6f5314b4df61437f2717e2da725f14c bc0862764f2ccaf0d68b9a87af2adf46 525491e5701d2a0ef1f4642513a6daef

Vector 3 — eSTREAM Rabbit Set 6, vector#3 - stream[0..63], exercises IV setup

Field	Value
key	0f62b5085bae0154a7fa4da0f34699ec
iv	288ff65dc42b92f9
input	00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000
expected	613cb0ba96aff6cacf2a459a102a7f78 ca985cf8fdd1474018758e36ae9923f5 19d13d718daf8d7c0c109b79d5749439 b7efa4c4c9c8d29dc5b3888314a6816f

Vector 4 — Crypto++ / eSTREAM reference rabbit.txt - all-zero key, no IV setup

Field	Value
key	00000000000000000000000000000000
input	0000000000000000000000000000000000000000000000000000000000000000
expected	02f74a1c26456bf5ecd6a536f05457b1a78ac689476c697b390c9cc515d8e888

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