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MD5-512 (DarkCrypt)

MD5-512 as implemented in the DarkCrypt Total Commander plugin: the standard MD5 compression function used as an unkeyed-IV, non-feedback block permutation, with the 512-bit key supplying the message schedule directly. 128-bit block, 512-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-md5.js

Parameters

Parameter	Supported values
Key sizes	64 bytes (512 bits)
Block sizes	16 bytes (128 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 MD5-512 - all-zero key and plaintext

Field	Value
key	00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000
input	00000000000000000000000000000000
expected	971ccdf7813648a532d8682b39a60cf9

Vector 2 — DarkCrypt MD5-512 - incrementing key and plaintext

Field	Value
key	000102030405060708090a0b0c0d0e0f 101112131415161718191a1b1c1d1e1f 202122232425262728292a2b2c2d2e2f 303132333435363738393a3b3c3d3e3f
input	000102030405060708090a0b0c0d0e0f
expected	6d210fba8457fd414a30c8e0c470ae14

Vector 3 — DarkCrypt MD5-512 - shifted incrementing key and plaintext

Field	Value
key	0102030405060708090a0b0c0d0e0f10 1112131415161718191a1b1c1d1e1f20 2122232425262728292a2b2c2d2e2f30 3132333435363738393a3b3c3d3e3f40
input	101112131415161718191a1b1c1d1e1f
expected	dcdb82ce51a0561b5d040a1df4aad95f

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