Trait SecurityProvider 

pub trait SecurityProvider {
    // Required methods
    fn generate_seed(
        &mut self,
        level: u8,
        buf: &mut [u8],
    ) -> Result<usize, SecurityError>;
    fn validate_key(
        &self,
        level: u8,
        seed: &[u8],
        key: &[u8],
    ) -> Result<(), SecurityError>;
}

Provides seed generation and key validation for UDS SecurityAccess (0x27).

The seed/key algorithm is always application-psecific. This trait allows the server to delegate without knowing the algorithm.

Security Levels

UDS security levels use odd bytes for Request Seed (0x01, 0x03, 0x05, …) and the corresponding even byte for Send Key (0x02, 0x04, 0x06, …). The level parameter is always the RequestSeed byte (odd).

Simulation

In DST the implementation should derive seeds from the injected RNG so that the full exchange is reproducible across simulation runs.

Required Methods

fn generate_seed( &mut self, level: u8, buf: &mut [u8], ) -> Result<usize, SecurityError>

Generates a seed for the given security level.

Writes seed bytes into buf and returns the number of bytes written. On real hardware the seed must be non-deterministic (hardware RNG). In simulation derive from the seeded ace_sim::rng::Rng.

fn validate_key( &self, level: u8, seed: &[u8], key: &[u8], ) -> Result<(), SecurityError>

Validates a key against the previously generated seed.

Returns Ok(()) if the key is correct.

Dyn Compatibility

This trait is dyn compatible.

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

Implementors