Crate rand_core

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Random number generation traits

This crate is mainly of interest to crates publishing implementations of RngCore. Other users are encouraged to use the rand crate instead which re-exports the main traits and error types.

RngCore is the core trait implemented by algorithmic pseudo-random number generators and external random-number sources.

SeedableRng is an extension trait for construction from fixed seeds and other random number generators.

Error is provided for error-handling. It is safe to use in no_std environments.

The impls and le sub-modules include a few small functions to assist implementation of RngCore.


The BlockRngCore trait and implementation helpers
Helper functions for implementing RngCore functions.
Little-Endian utilities


Error type of random number generators
A random number generator that retrieves randomness from the operating system.


A marker trait used to indicate that an RngCore or BlockRngCore implementation is supposed to be cryptographically secure.
The core of a random number generator.
A random number generator that can be explicitly seeded.