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Xoroshiro128+

Xoroshiro128+ is a fast, small-state pseudo-random number generator with a 128-bit state. The + variant uses simple addition as the scrambler, making it the fastest in the xoroshiro family but with lower statistical quality than ++ and **. Suitable for non-cryptographic applications where speed is critical.

Properties

Property	Value
Category	Random Number Generators
Sub-category	Non-Cryptographic PRNG
Security status	🎓 Educational Only
Complexity	Beginner
Inventor	David Blackman, Sebastiano Vigna
Year	2016
Origin	🇮🇹 Italy
Source	algorithms/random/xoroshiro128plus.js

Parameters

Parameter	Supported values
Seed sizes	8 bytes (64 bits)

Capabilities

Flag	Value
IsDeterministic	Yes
IsCryptographicallySecure	No

Security

Status: 🎓 Educational Only

No vulnerabilities are recorded for this implementation.

Documentation

• Official Reference Implementation
• xoshiro / xoroshiro generators and the PRNG shootout
• Original Paper: Scrambled Linear Pseudorandom Number Generators (2018)

References

• Wikipedia: Xoroshiro128+
• PCG: A Quick Look at Xoshiro256**

Test vectors

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

Vector 1 — Seed=0: First four 64-bit outputs from xoroshiro128+

Field	Value
seed	0000000000000000
outputSize	32
input	null
expected	1e4c37c8688527892e36f5cee7d6e1c9e155f41286c4260d4cefb1612219f897

Vector 2 — Seed=1: First four 64-bit outputs from xoroshiro128+

Field	Value
seed	0100000000000000
outputSize	32
input	null
expected	dfbd3bfdf4d84bef9114e6ea7c358e4c711c063ae9ccf7432d15e6a0f88f4e78

Vector 3 — Seed=12345: First four 64-bit outputs

Field	Value
seed	3930000000000000
outputSize	32
input	null
expected	dfce102c79e21e26220cf0ea6baca21a7cab5c2e2d7f5a87e5f01a10f78bee25

Vector 4 — Seed=0xDEADBEEF: First four 64-bit outputs

Field	Value
seed	efbeadde00000000
outputSize	32
input	null
expected	e781e0a656fcb46978eba13167201a7dc7b3940db918a1fd48e5552a046db39f

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