}
/// Return the seed stored in the [`RAD_SEED`] environment variable, or generate a random one.
/// Return the seed stored in the [`RAD_KEYGEN_SEED`] environment variable,
/// or generate a random one.
pub fn seed() -> crypto::Seed {
if let Ok(seed) = var(RAD_KEYGEN_SEED) {
let Ok(seed) = (0..seed.len())