Trait Rng 

pub trait Rng {
    // Required method
    fn rng_fill(&mut self, buf: &mut [u8]) -> Result<(), CryptoError>;
}

Caller-provided entropy source for crypto operations that need fresh randomness (ECDSA nonces, ephemeral key generation).

Object-safe so it can be passed as &mut dyn Rng into driver traits. Production implementations wrap a hardware TRNG or a CSPRNG seeded from one. Test code may inject a deterministic implementation (seeded DRBG or fixed bytes) to get reproducible outputs for known-answer tests.

Required Methods

fn rng_fill(&mut self, buf: &mut [u8]) -> Result<(), CryptoError>

Fill buf with cryptographically secure random bytes.

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors