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dSFMT-521 (Double precision SIMD-oriented Fast Mersenne Twister)

dSFMT-521 is a variant of Mersenne Twister optimized for generating double precision floating point numbers directly. It has period 2^521-1 and generates IEEE 754 doubles in range [1, 2) with 52-bit mantissa precision, though this JavaScript version uses portable scalar implementation.

Properties

Property	Value
Category	Random Number Generators
Sub-category	Pseudo-Random Number Generator
Security status	🎓 Educational Only
Complexity	Advanced
Inventor	Mutsuo Saito and Makoto Matsumoto
Year	2007
Origin	🇯🇵 Japan
Source	algorithms/random/dsfmt.js

Parameters

Parameter	Supported values
Seed sizes	4 bytes (32 bits)

Capabilities

Flag	Value
IsDeterministic	Yes
IsCryptographicallySecure	No

Security

Status: 🎓 Educational Only

No vulnerabilities are recorded for this implementation.

Documentation

• Official dSFMT Website
• dSFMT Paper: A PRNG specialized in double precision floating point numbers
• GitHub Repository: MersenneTwister-Lab/dSFMT

References

• Reference Implementation (C code)
• dSFMT-521 Parameters
• Test Vectors (double precision output)

Test vectors

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

Vector 1 — [dSFMT-521 seed 0, doubles 1-5 in 1,2) - reference prints 1.421944098478936 1.957408659873361 1.190111011127383 1.632549872377003 1.616831120464805

Field	Value
seed	00000000
outputSize	40
input	null
expected	(empty)

Vector 2 — [dSFMT-521 seed 0, doubles 6-10 in 1,2) - reference prints 1.984390160895336 1.643335574461273 1.739347032660861 1.228605414113949 1.052731243538065

Field	Value
seed	00000000
skipBytes	40
outputSize	40
input	null
expected	(empty)

Vector 3 — [dSFMT-521 seed 0, doubles 11-15 in 1,2) - reference prints 1.772446323308858 1.114863567000073 1.636605378654444 1.087462000589056 1.391044934734219

Field	Value
seed	00000000
skipBytes	80
outputSize	40
input	null
expected	(empty)

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