Hawkynt

SHAKE256

SHAKE256 is an extendable-output function (XOF) from NIST FIPS 202 with 256-bit security. Can produce variable-length output, making it suitable for applications requiring arbitrary hash lengths.

Properties

Property	Value
Category	Hash Functions
Sub-category	SHA-3 XOF
Variant	256
Security status	Not classified
Complexity	Intermediate
Inventor	Guido Bertoni, Joan Daemen, Michaël Peeters, Gilles Van Assche
Year	2015
Origin	🇧🇪 Belgium
Source	algorithms/hash/shake.js

Parameters

Parameter	Supported values
Output sizes	1 byte (8 bits) to 1024 bytes (8192 bits)

Security

Status: not classified — treat as unverified.

No vulnerabilities are recorded for this implementation.

Documentation

• NIST FIPS 202
• Keccak Team

References

• Crypto++ SHAKE
• NIST Test Vectors

Test vectors

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

Vector 1 — SHAKE256: Empty, 64 bytes (Crypto++)

Field	Value
outputSize	64
input	(empty)
expected	46b9dd2b0ba88d13233b3feb743eeb24 3fcd52ea62b81b82b50c27646ed5762f d75dc4ddd8c0f200cb05019d67b592f6 fc821c49479ab48640292eacb3b7c4be

Vector 2 — SHAKE256: Single byte, 64 bytes (Crypto++)

Field	Value
outputSize	64
input	af
expected	b7cbfeda173533a5fb72340c9af14b82 545bc9fa02828da3b6773094289fb8fe 75cff7d0bdfb6015f3068907a1ba2461 1631d1dbe4eadf8d95a9f6b6021231b7

Vector 3 — SHAKE256: Two bytes, 64 bytes (Crypto++)

Field	Value
outputSize	64
input	4fd6
expected	426d6fcdfb2387a470c4b55b999315c6 9c9cbbcac337b98d5f5cb38accfe99e2 b195432bb464b2e857ff20db2a10563b f93fb518e6f246397c1c86ce19a7c1c1

Vector 4 — SHAKE256: Four bytes, 64 bytes (Crypto++)

Field	Value
outputSize	64
input	fae3e468
expected	5b3f24082085a8e223cdfdc2d644f559 befef6ef22288d87717cc7af1a9fcb18 dfde7ad7e38838015894f7acc98e420d b10ded4e85837b1b19cfe0007dc3fc4a

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