The seed must be uniform, secret and secret_seed_length bytes long.
pub fn init(secret_seed: [secret_seed_length]u8) Self
pub fn init(secret_seed: [secret_seed_length]u8) Self {
var self: Self = .{ .state = undefined, .offset = 0 };
Cipher.stream(&self.state, 0, secret_seed, nonce);
return self;
}