Hawkynt

MD5-Karn (DarkCrypt)

MD5-Karn as implemented in the DarkCrypt Total Commander plugin: a 3-round unbalanced Feistel-like network over two 128-bit halves, using full standard MD5 compressions (with Davies-Meyer feedback) as the round function. 256-bit block, 768-bit key.

Properties

Property	Value
Category	Block Ciphers
Sub-category	Block Cipher
Security status	🎓 Educational Only
Complexity	Intermediate
Inventor	Alexander Myasnikov (DarkCrypt plugin)
Year	2013
Origin	🇷🇺 Russia
Source	algorithms/block/darkcrypt-mdckarn.js

Parameters

Parameter	Supported values
Key sizes	96 bytes (768 bits)
Block sizes	32 bytes (256 bits)

Security

Status: 🎓 Educational Only

No vulnerabilities are recorded for this implementation.

Documentation

• DarkCrypt plugin (Total Commander PlugRing)
• RFC 1321: The MD5 Message-Digest Algorithm

Test vectors

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

Vector 1 — DarkCrypt MD5-Karn - all-zero key and plaintext

Field	Value
key	00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000
input	0000000000000000000000000000000000000000000000000000000000000000
expected	452acc3a076ef6fd75da6abbfc31a513d85b25d31090fa2fb34475086902748b

Vector 2 — DarkCrypt MD5-Karn - incrementing key and plaintext

Field	Value
key	000102030405060708090a0b0c0d0e0f 101112131415161718191a1b1c1d1e1f 202122232425262728292a2b2c2d2e2f 303132333435363738393a3b3c3d3e3f 404142434445464748494a4b4c4d4e4f 505152535455565758595a5b5c5d5e5f
input	000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f
expected	0606ccc436fabe0f4bf8c063af689e809ef6381e01659ec52da0972954f94f2c

Vector 3 — DarkCrypt MD5-Karn - shifted incrementing key and plaintext

Field	Value
key	0102030405060708090a0b0c0d0e0f10 1112131415161718191a1b1c1d1e1f20 2122232425262728292a2b2c2d2e2f30 3132333435363738393a3b3c3d3e3f40 4142434445464748494a4b4c4d4e4f50 5152535455565758595a5b5c5d5e5f60
input	101112131415161718191a1b1c1d1e1f202122232425262728292a2b2c2d2e2f
expected	91e968de04795d5eb92b3bcb32cb57550f5dc79886427010fea8633b037feffa

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