Generate random numbers using only standard library

Overview

This Rust crate provides various random number generation utilities, including:

• Random u8,u16,u32,u64,u128 generation.
• Non negative i8,i16,i32,i64,i128 generation
• Floating-point randomness (f32 and f64) in [0,1).
• Random byte filling for buffers.
• Random range filling for slices.
• Random number generation from Range.
• High entropy random number generation by using separate thread RandomState.
• Fast but lower-entropy alternatives using thread local RandomState.

Features

• Minimal supported Rust version 1.56. Entire 2018 Rust edition is supported.
• No external dependencies beyond standard Rust library.
• Thread-based randomness: Uses separate threads for improved entropy (random_u64()).
• Secure and fast implementations for generating random numbers.
• Uniform distribution ensured for floating-point values.

Functions returning random numbers

random_u128(), random_u64(), random_u32(), random_u16(), random_u8(), random_usize()

Generates a unsigned high entropy random number in a separate thread. These numbers have uniform distribution and pass chi square test.

fast_u128(), fast_u64(), fast_u32(), fast_u16(), fast_u8(), fast_usize()

Generates a lower entropy random number from current thread.

random_f64(), random_f32()

Generates a high entropy random floating point number in a separate thread from in [0, 1) range. These numbers have uniform distribution and pass chi square test.

fast_f32(), fast_f64()

Generates a lower entropy random floating point number in [0, 1).

Helper Functions

fill_bytes(), fill_numbers()

Fills slice with random numbers with provided generator.

gen_range(), fill_range()

Generate random number from specified range.

No copyright

This code is released under a "No Copyright" license.

You may use, modify, distribute, and contribute to this code without restriction. To the extent possible under law, the author(s) of this work waive all copyright and related rights.

Licensed under CC0-1.0 OR Unlicense.