# `ExFPE.FFX`
[🔗](https://github.com/g-andrade/ex_fpe/blob/v0.1.0/lib/ex_fpe/ffx.ex#L3)

FFX definitions.

# `byte_string`

```elixir
@type byte_string() :: <<_::8, _::_*8>>
```

# `key`

```elixir
@type key() :: <<_::128>> | <<_::192>> | <<_::256>>
```

# `radix`

```elixir
@type radix() :: pos_integer()
```

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*Consult [api-reference.md](api-reference.md) for complete listing*