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fea412dd94
This brings us up to 955e874acc535ab2c74c1cf0eab61896ea4224ff in https://github.com/lightningnetwork/lightning-rfc This doesn't actually change anything; the only actual change is held back for the next commit. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
56 lines
1.8 KiB
C
56 lines
1.8 KiB
C
#include <lightningd/key_derive.h>
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#include <lightningd/keyset.h>
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bool derive_keyset(const struct pubkey *per_commitment_point,
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const struct pubkey *self_payment_basepoint,
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const struct pubkey *other_payment_basepoint,
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const struct pubkey *self_delayed_basepoint,
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const struct pubkey *other_revocation_basepoint,
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struct keyset *keyset)
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{
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/* BOLT #3:
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*
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* ### `localkey`, `remotekey`, `local_delayedkey` and
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* `remote_delayedkey` Derivation
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*
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* These keys are simply generated by addition from their base points:
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*
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* pubkey = basepoint + SHA256(per_commitment_point || basepoint)*G
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*
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* The `localkey` uses the local node's `payment_basepoint`,
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* `remotekey` uses the remote node's `payment_basepoint`, the
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* `local_delayedkey` uses the local node's
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* `delayed_payment_basepoint`, and the `remote_delayedkey` uses the
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* remote node's `delayed_payment_basepoint`.
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*/
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if (!derive_simple_key(self_payment_basepoint,
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per_commitment_point,
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&keyset->self_payment_key))
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return false;
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if (!derive_simple_key(other_payment_basepoint,
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per_commitment_point,
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&keyset->other_payment_key))
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return false;
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if (!derive_simple_key(self_delayed_basepoint,
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per_commitment_point,
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&keyset->self_delayed_payment_key))
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return NULL;
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/* BOLT #3:
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*
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* ### `revocationkey` Derivation
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*
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* The `revocationkey` is a blinded key: when a node wishes to create
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* a new commitment for a remote node, it uses its own
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* `revocation_basepoint` and the remote node's `per_commitment_point`
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* to derive a new `revocationkey` for the commitment.
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*/
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if (!derive_revocation_key(other_revocation_basepoint,
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per_commitment_point,
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&keyset->self_revocation_key))
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return false;
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return true;
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}
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