amp

type Child struct {
	// ChildDesc contains the data required to derive the child hash and
	// preimage below.
	ChildDesc

	// Preimage is the child payment preimage that can be used to settle the
	// HTLC carrying Hash.
	Preimage lntypes.Preimage

	// Hash is the child payment hash that to be carried by the HTLC.
	Hash lntypes.Hash
}

type ChildDesc struct {
	// Share is one of n shares of the root seed. Once all n shares are
	// known to the receiver, the Share will also provide entropy to the
	// derivation of child hash and preimage.
	Share Share

	// Index is 32-bit value that can be used to derive up to 2^32 child
	// hashes and preimages from a single Share. This allows the payment
	// hashes sent over the network to be refreshed without needing to
	// modify the Share.
	Index uint32
}

type SeedSharer struct {
	// contains filtered or unexported fields
}

type Share [32]byte

type Sharer interface {
	// Root returns the root share of the derivation tree. This is the value
	// that will be reconstructed when combining the set of all child
	// shares.
	Root() Share

	// Child derives a child preimage and child hash given a 32-bit index.
	// Passing a different index will generate a unique preimage-hash pair
	// with high probability, allowing the payment hash carried on HTLCs to
	// be refreshed without needing to modify the share value. This would
	// typically be used when an partial payment needs to be retried if it
	// encounters routine network failures.
	Child(index uint32) *Child

	// Split returns a Sharer for the left and right child of the parent
	// Sharer. XORing the share values of both sharers always yields the
	// share value of the parent. The sender should use this to recursively
	// divide payments that are too large into smaller subpayments, knowing
	// that the shares of all nodes descending from the parent will XOR to
	// the parent's share.
	Split() (Sharer, Sharer, error)
}