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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 features a 128-bit state, 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/xoshiro-plusplus.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 (Xoshiro128++)
• xoshiro / xoroshiro generators and the PRNG shootout
• Original Paper: Scrambled Linear Pseudorandom Number Generators (2018)

References

• Wikipedia: Xoroshiro128+
• Rust SmallRng (uses xoshiro128++)
• Java RandomGenerator (includes xoshiro128++)

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	a4f2ce6940989589be3eb9ee379984999131ee28

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

Field	Value
seed	01000000
outputSize	20
input	null
expected	fa6c3236d177304e8dcdf4485771d5ec85edafa7

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

Field	Value
seed	2a000000
outputSize	20
input	null
expected	8261ca0447e7ab9a7705c7a3d606ff3e5e1d4920

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

Field	Value
seed	39300000
outputSize	20
input	null
expected	8a1d79000e7e11b369576395cbb730d0456116da

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