Function lightning::ln::chan_utils::derive_public_key

pub fn derive_public_key<T: Signing>(
    secp_ctx: &Secp256k1<T>, 
    per_commitment_point: &PublicKey, 
    base_point: &PublicKey
) -> Result<PublicKey, SecpError>

Derives a per-commitment-transaction public key (eg an htlc key or a delayed_payment key) from the base point and the per_commitment_key. This is the public equivalent of derive_private_key - using only public keys to derive a public key instead of private keys.

Note that this is infallible iff we trust that at least one of the two input keys are randomly generated (ie our own).