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Xoshiro128**

Xoshiro128** is a 32-bit all-purpose, rock-solid pseudo-random number generator with excellent speed and statistical properties. It uses a multiplication-based scrambler for superior statistical quality, passes all BigCrush tests, and is ideal for embedded systems, GPUs, and JavaScript environments.

Properties

Property	Value
Category	Random Number Generators
Sub-category	Non-Cryptographic PRNG
Security status	🎓 Educational Only
Complexity	Intermediate
Inventor	David Blackman, Sebastiano Vigna
Year	2018
Origin	🇮🇹 Italy
Source	algorithms/random/xoshiro128starstar.js

Parameters

Parameter	Supported values
Seed sizes	1 byte (8 bits) to 4 bytes (32 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+
• Comparison: ** vs ++ scrambler

Test vectors

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

Vector 1 — Seed=0: First five 32-bit outputs from xoshiro128**

Field	Value
seed	00000000
outputSize	20
input	null
expected	2037b06a9e34ae0224504996391367e59272d943

Vector 2 — Seed=1: First five 32-bit outputs from xoshiro128**

Field	Value
seed	01000000
outputSize	20
input	null
expected	d4197117e52d9681b39a60e37ac1bc7c8e542c6f

Vector 3 — Seed=42: First five 32-bit outputs from xoshiro128**

Field	Value
seed	2a000000
outputSize	20
input	null
expected	3d945d27b4aab9d94e30a104211041369c97ee88

Vector 4 — Seed=12345: First five 32-bit outputs

Field	Value
seed	39300000
outputSize	20
input	null
expected	b30b2a41dd95190c658600df663db8e2e47d12f9

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