Hawkynt

SHISHUA

SHISHUA is the fastest PRNG in the world, achieving 0.06 cycles per byte on modern x86-64 processors. Designed by Thaddée Tyl using a shift-shuffle-add pattern with large state (16 x 64-bit), it passes PractRand beyond 32 TiB while delivering exceptional speed.

Properties

Property	Value
Category	Random Number Generators
Sub-category	High-Performance PRNG
Security status	🎓 Educational Only
Complexity	Advanced
Inventor	Thaddée Tyl
Year	2020
Origin	🇫🇷 France
Source	algorithms/random/shishua.js

Parameters

Parameter	Supported values
Seed sizes	32 bytes (256 bits)

Capabilities

Flag	Value
IsDeterministic	Yes
IsCryptographicallySecure	No

Security

Status: 🎓 Educational Only

No vulnerabilities are recorded for this implementation.

Documentation

• SHISHUA Official Repository
• Blog Post: SHISHUA - The Fastest PRNG In The World
• Reference C Implementation (Scalar)
• Official Test Vectors

References

• PractRand Statistical Testing Suite
• BigCrush Test Suite (TestU01)

Test vectors

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

Vector 1 — Seed Zero: First 128 bytes (official test vector)

Field	Value
seed	0000000000000000000000000000000000000000000000000000000000000000
outputSize	128
input	null
expected	955d96f90fb4aa53092d82e63a7c09e2 2ca5a4a5a75a5a39dc68b4125de7ce2b 6b6efef58bd9cc4212dd744e81fd18b9 58f0625d38efcc1b6fdb0da336f7e5ee 6bdbe8ea5cda40c75344d0d5bfc1d507 e02cf51208711bea8882cfd6ccf71d06 62c75ef1985df2c6d56d3d2e35dad685 3ac176b74db7e026512dce348ba603f1

Vector 2 — Seed Pi: First 128 bytes (digits of pi as seed)

Field	Value
seed	243f6a8885a308d313198a2e03707344a409382229f31d0082efa98ec4e6c894
outputSize	128
input	null
expected	fa62a926dc1fbf00f13ce868459b6f74 4bbf2b57505ed8160e4ed92a2ef6965c 01b5c9e79d84d8d95f0db74a47f4acc8 25cc0b2e3b90030a1d443cd827a842e0 6e8fa0c1b28e183de393067911dc9293 0d85acdedbb32304d0befe74efbbbf19 c1150a347845a22793b7b24d4b4f6eb6 c0dc42546a9bcd5073faa19cb4d1d287

Vector 3 — Seed Zero: 512 bytes (extended output test)

Field	Value
seed	0000000000000000000000000000000000000000000000000000000000000000
outputSize	512
input	null
expected	955d96f90fb4aa53092d82e63a7c09e2 2ca5a4a5a75a5a39dc68b4125de7ce2b 6b6efef58bd9cc4212dd744e81fd18b9 58f0625d38efcc1b6fdb0da336f7e5ee … (512 bytes; the full value is in the source)

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