Struct FnCodex 

pub struct FnCodex<F> { /* private fields */ }

Wrap a user-provided closure as a Codex.

The closure is presumed to be an involution; nothing in the type system enforces this and violating the property will corrupt every stored key. Test your closure with the property test in the codex integration suite before using it in production.

Examples

use key_vault::codex::{Codex, FnCodex};

// XOR with a fixed mask is an involution.
let codex = FnCodex::new(|b: u8| b ^ 0x5a);
assert_eq!(codex.decode(codex.encode(0x42)), 0x42);

Implementations

impl<F> FnCodex<F>

where F: Fn(u8) -> u8 + Send + Sync,

pub fn new(f: F) -> Self

Wrap the given involution.

Trait Implementations

impl<F> Codex for FnCodex<F>

where F: Fn(u8) -> u8 + Send + Sync,

fn encode(&self, byte: u8) -> u8

Transform a byte on the way into storage.

fn decode(&self, byte: u8) -> u8

Transform a byte on the way out of storage.