Hawkynt

Threefish

Tweakable block cipher family designed as part of the Skein hash function. Threefish-512 uses 512-bit blocks and keys with 72 rounds, optimized for 64-bit platforms and resistance to timing attacks.

Properties

Property	Value
Category	Block Ciphers
Sub-category	Block Cipher
Security status	Not classified
Complexity	Advanced
Inventor	Bruce Schneier, Niels Ferguson, Stefan Lucks, Doug Whiting, Mihir Bellare, Tadayoshi Kohno, Jon Callas, Jesse Walker
Year	2008
Origin	🇺🇸 United States
Source	algorithms/block/threefish.js

Parameters

Parameter	Supported values
Key sizes	64 bytes (512 bits)
Block sizes	64 bytes (512 bits)

Security

Status: not classified — treat as unverified.

No vulnerabilities are recorded for this implementation.

Documentation

• The Skein Hash Function Family
• Threefish Specification
• NIST SHA-3 Submission

References

• Threefish Cryptanalysis
• Skein/Threefish Security Analysis
• NIST SHA-3 Competition Analysis

Test vectors

1 vector ship with this algorithm and run in the test suite. Byte values are hexadecimal.

Vector 1 — Threefish-512 all zeros test vector

Field	Value
key	00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000
input	00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000
expected	b1a2bbc6ef6025bc40eb3822161f36e3 75d1bb0aee3186fbd19e47c5d479947b 7bc2f8586e35f0cff7e7f03084b0b7b1 f1ab3961a580a3e97eb41ea14a6d7bbe

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