Tracking Issue for deterministic random number generation

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Feature gate: #![feature(deterministic_random_chacha8)]

This is a tracking issue for DeterministicRandomSource, a deterministic random number generation that will always generate the same values for a given seed.

Public API

// core::random;

pub struct DeterministicRandomSource { .. }

impl DeterministicRandomSource {
    pub const fn from_seed(seed: [u8; 32]) -> DeterministicRandomSource;
    pub const fn seed(&self) -> &[u8; 32];
}

impl RandomSource for DeterministicRandomSource { .. }
impl Random for DeterministicRandomSource { .. }

Steps / History

• ACP: https://github.com/rust-lang/libs-team/issues/394
• Implementation: #...
• Final comment period (FCP)^1
• Stabilization PR

Unresolved Questions

• Is ChaCha8 the right random number generator to use? Given that this RNG should not be used for cryptographic purposes, ChaCha8 might be a bit overkill.
• Does the seed function make sense?

Start with the proposed public API for DeterministicRandomSource and the linked ACP in libs-team issue #394. Review the unresolved questions about ChaCha8 and seed(), then determine how the missing implementation, final comment period, and stabilization PR would be addressed. Done means the implementation and stabilization steps are complete.