SHARK-A variant from the DarkCrypt Total Commander plugin: a non-standard SHARK derivative with a GF(2^8) plaintext-whitening multiplier, six full-diffusion rounds (no separate S-box-only final round) and a rejection-sampled round-key schedule. 64-bit block, 128-bit key.
| Property | Value |
|---|---|
| Category | Block Ciphers |
| Sub-category | Block Cipher |
| Security status | 🎓 Educational Only |
| Complexity | Expert |
| Inventor | Vincent Rijmen, Joan Daemen, Bart Preneel, Anton Bosselaers, Erik De Win (base SHARK); DarkCrypt variant by Alexander Myasnikov |
| Year | 2013 |
| Origin | 🇷🇺 Russia |
| Source | algorithms/block/darkcrypt-shark-a.js |
| Parameter | Supported values |
|---|---|
| Key sizes | 16 bytes (128 bits) |
| Block sizes | 8 bytes (64 bits) |
Status: 🎓 Educational Only
| Issue | Description | Mitigation |
|---|---|---|
| Non-standard variant | Bespoke SHARK derivative with an undocumented key schedule and round structure; unanalyzed and not recommended for real use. | Use AES or another vetted cipher. |
3 vectors ship with this algorithm and run in the test suite. Byte values are hexadecimal.
Vector 1 — DarkCrypt Shark — zero key/plaintext
| Field | Value |
|---|---|
key |
00000000000000000000000000000000 |
input |
0000000000000000 |
expected |
446d7d01312bb9ce |
Vector 2 — DarkCrypt Shark — incrementing key/plaintext
| Field | Value |
|---|---|
key |
000102030405060708090a0b0c0d0e0f |
input |
0001020304050607 |
expected |
c91316734048a0f9 |
Vector 3 — DarkCrypt Shark — shifted incrementing key/plaintext
| Field | Value |
|---|---|
key |
0102030405060708090a0b0c0d0e0f10 |
input |
1011121314151617 |
expected |
081b61f75f592646 |