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SipHash-128

128-bit output variant of SipHash. Fast cryptographically secure PRF producing 16-byte MAC tags. Default configuration uses 2 compression rounds and 4 finalization rounds (SipHash-2-4-128).

Properties

Property	Value
Category	Message Authentication
Sub-category	Pseudo-Random Function
Security status	🛡️ Secure
Complexity	Intermediate
Inventor	Jean-Philippe Aumasson, Daniel J. Bernstein
Year	2012
Origin	🇨🇭 Switzerland
Source	algorithms/mac/siphash128.js

Parameters

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

Capabilities

Flag	Value
NeedsKey	Yes

Security

Status: 🛡️ Secure

No vulnerabilities are recorded for this implementation.

Documentation

• SipHash Paper
• SipHash Official Repository
• BouncyCastle SipHash128 Reference

References

• RFC 9018 (DNS Cookie usage)
• SipHash Test Vectors
• BouncyCastle Test Suite

Test vectors

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

Vector 1 — SipHash-128 Official Vector #0 (empty input)

Field	Value
key	000102030405060708090a0b0c0d0e0f
input	(empty)
expected	a3817f04ba25a8e66df67214c7550293

Vector 2 — SipHash-128 Official Vector #1 (1 byte: 0x00)

Field	Value
key	000102030405060708090a0b0c0d0e0f
input	00
expected	da87c1d86b99af44347659119b22fc45

Vector 3 — SipHash-128 Official Vector #2 (2 bytes: 0x00, 0x01)

Field	Value
key	000102030405060708090a0b0c0d0e0f
input	0001
expected	8177228da4a45dc7fca38bdef60affe4

Vector 4 — SipHash-128 Official Vector #3 (3 bytes: 0x00, 0x01, 0x02)

Field	Value
key	000102030405060708090a0b0c0d0e0f
input	000102
expected	9c70b60c5267a94e5f33b6b02985ed51

Vector 5 — SipHash-128 Official Vector #7 (7 bytes)

Field	Value
key	000102030405060708090a0b0c0d0e0f
input	00010203040506
expected	a1f1ebbed8dbc153c0b84aa61ff08239

Vector 6 — SipHash-128 Official Vector #15 (15 bytes)

Field	Value
key	000102030405060708090a0b0c0d0e0f
input	000102030405060708090a0b0c0d0e
expected	5493e99933b0a8117e08ec0f97cfc3d9

Vector 7 — SipHash-128 Official Vector #31 (31 bytes)

Field	Value
key	000102030405060708090a0b0c0d0e0f
input	000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e
expected	2939b0183223fafc1723de4f52c43d35

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