Hawkynt

Schwaemm256-128

NIST Lightweight Cryptography finalist using SPARKLE-384 permutation. Primary recommended variant with 256-bit nonce and 128-bit security.

Properties

Property	Value
Category	Authenticated Encryption
Sub-category	Authenticated Encryption
Security status	🧪 Experimental
Complexity	Intermediate
Inventor	Christoph Dobraunig, Maria Eichlseder, Florian Mendel, Martin Schläffer
Year	2019
Origin	Not specified
Source	algorithms/aead/sparkle.js

Parameters

Parameter	Supported values
Key sizes	16 bytes (128 bits)
Tag sizes	16 bytes (128 bits)

Capabilities

Flag	Value
SupportsDetached	No

Security

Status: 🧪 Experimental

No vulnerabilities are recorded for this implementation.

Documentation

• NIST LWC Sparkle Specification
• Sparkle Project Website
• NIST LWC Final Round

References

• Official Sparkle Reference Implementation
• rweather/lwc-finalists C Reference (embedded-optimized)

Test vectors

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

Vector 1 — NIST LWC KAT Count=1 (empty PT, empty AD)

Field	Value
key	000102030405060708090a0b0c0d0e0f
nonce	000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f
associatedData	(empty)
input	(empty)
expected	9e3f9f2e8e26e7d00a9eb92730717a51

Vector 2 — NIST LWC KAT Count=2 (empty PT, 1-byte AD)

Field	Value
key	000102030405060708090a0b0c0d0e0f
nonce	000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f
associatedData	00
input	(empty)
expected	57f83c3e696ae65582dd27fe6fc2f239

Vector 3 — NIST LWC KAT Count=17 (empty PT, 16-byte AD)

Field	Value
key	000102030405060708090a0b0c0d0e0f
nonce	000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f
associatedData	000102030405060708090a0b0c0d0e0f
input	(empty)
expected	07126e0ff608d8eb866a4b7e33bf7b21

Vector 4 — NIST LWC KAT Count=34 (1-byte PT, empty AD)

Field	Value
key	000102030405060708090a0b0c0d0e0f
nonce	000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f
associatedData	(empty)
input	00
expected	9b6f7db3323c0b372a4584082e5ab4265c

Vector 5 — NIST LWC KAT Count=529 (16-byte PT, empty AD)

Field	Value
key	000102030405060708090a0b0c0d0e0f
nonce	000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f
associatedData	(empty)
input	000102030405060708090a0b0c0d0e0f
expected	9bac759db8d6d0c50ea19385a3456ba7bfae89698782544828f11895d2ee85e9

Vector 6 — NIST LWC KAT Count=1057 (32-byte PT, empty AD)

Field	Value
key	000102030405060708090a0b0c0d0e0f
nonce	000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f
associatedData	(empty)
input	000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f
expected	9bac759db8d6d0c50ea19385a3456ba7 e061097ccb2683b3f4253c36569a3d15 a3a5e0afdfe60754eb50684fe945aa6a

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