Hawkynt

Twofish

AES finalist cipher by Bruce Schneier with key-dependent S-boxes and MDS matrix. Supports 128, 192, and 256-bit keys with excellent security analysis.

Properties

Property	Value
Category	Block Ciphers
Sub-category	Block Cipher
Security status	Not classified
Complexity	Advanced
Inventor	Bruce Schneier, John Kelsey, Doug Whiting, David Wagner, Chris Hall, Niels Ferguson
Year	1998
Origin	🇺🇸 United States
Source	algorithms/block/twofish.js

Parameters

Parameter	Supported values
Key sizes	16 bytes (128 bits); 24 bytes (192 bits); 32 bytes (256 bits)
Block sizes	16 bytes (128 bits)

Security

Status: not classified — treat as unverified.

No vulnerabilities are recorded for this implementation.

Documentation

• Twofish Algorithm Specification
• Twofish: A 128-Bit Block Cipher
• NIST AES Candidate Submission

References

• Crypto++ Twofish Implementation
• libgcrypt Twofish Implementation
• Bouncy Castle Twofish Implementation

Test vectors

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

Vector 1 — DarkCrypt Twofish vector 1/zero

Field	Value
key	0000000000000000000000000000000000000000000000000000000000000000
input	00000000000000000000000000000000
expected	57ff739d4dc92c1bd7fc01700cc8216f

Vector 2 — DarkCrypt Twofish vector 2/incr

Field	Value
key	000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f
input	000102030405060708090a0b0c0d0e0f
expected	8ef0272c42db838bcf7b07af0ec30f38

Vector 3 — DarkCrypt Twofish vector 3/incr2

Field	Value
key	0102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f20
input	101112131415161718191a1b1c1d1e1f
expected	36b0770fe4c470de19f63edf1a73e707

Vector 4 — Twofish ECB 128-bit Key Test Vector

Field	Value
key	00000000000000000000000000000000
input	00000000000000000000000000000000
expected	9f589f5cf6122c32b6bfec2f2ae8c35a

Vector 5 — Twofish ECB 128-bit Key Test Vector #2

Field	Value
key	00000000000000000000000000000000
input	9f589f5cf6122c32b6bfec2f2ae8c35a
expected	d491db16e7b1c39e86cb086b789f5419

Vector 6 — Twofish ECB 192-bit Key Test Vector

Field	Value
key	000000000000000000000000000000000000000000000000
input	00000000000000000000000000000000
expected	efa71f788965bd4453f860178fc19101

Vector 7 — Twofish ECB 256-bit Key Test Vector

Field	Value
key	0000000000000000000000000000000000000000000000000000000000000000
input	00000000000000000000000000000000
expected	57ff739d4dc92c1bd7fc01700cc8216f

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