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70 lines
2.3 KiB
70 lines
2.3 KiB
#include <common/key_derive.h>
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#include <common/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_htlc_basepoint,
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const struct pubkey *other_htlc_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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* ### `localpubkey`, `remotepubkey`, `local_htlcpubkey`,
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* `remote_htlcpubkey`, `local_delayedpubkey`, and
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* `remote_delayedpubkey` Derivation
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*
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* These pubkeys 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 `localpubkey` uses the local node's `payment_basepoint`; the
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* `remotepubkey` uses the remote node's `payment_basepoint`; the
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* `local_delayedpubkey` uses the local node's
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* `delayed_payment_basepoint`; the `local_htlcpubkey` uses the local
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* node's `htlc_basepoint`; and the `remote_delayedpubkey` 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_htlc_basepoint,
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per_commitment_point,
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&keyset->self_htlc_key))
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return false;
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if (!derive_simple_key(other_htlc_basepoint,
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per_commitment_point,
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&keyset->other_htlc_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 false;
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/* BOLT #3:
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*
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* ### `revocationpubkey` Derivation
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*
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* The `revocationpubkey` is a blinded key: when the local node wishes
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* to create a new commitment for the 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 `revocationpubkey` 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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