57 lines
1.8 KiB
C
57 lines
1.8 KiB
C
#ifndef LIGHTNING_LIGHTNINGD_DERIVE_BASEPOINTS_H
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#define LIGHTNING_LIGHTNINGD_DERIVE_BASEPOINTS_H
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#include "config.h"
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#include <bitcoin/privkey.h>
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#include <bitcoin/pubkey.h>
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struct sha256;
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struct basepoints {
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struct pubkey revocation;
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struct pubkey payment;
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struct pubkey delayed_payment;
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};
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struct secrets {
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struct privkey funding_privkey;
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struct secret revocation_basepoint_secret;
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struct secret payment_basepoint_secret;
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struct secret delayed_payment_basepoint_secret;
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};
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/**
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* derive_basepoints - given a (per-peer) seed, get the basepoints
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* @seed: (in) seed (derived by master daemon from counter and main seed)
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* @funding_pubkey: (out) pubkey for funding tx output (if non-NULL)
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* @basepoints: (out) basepoints for channel (if non-NULL)
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* @secrets: (out) basepoints for channel (if non-NULL)
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* @shaseed: (out) seed for shachain (if non-NULL)
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* @per_commit_point: (out) per-commit-point for @per_commit_index (if non-NULL)
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* @per_commit_index: (in) which @per_commit_point to set.
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*/
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bool derive_basepoints(const struct privkey *seed,
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struct pubkey *funding_pubkey,
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struct basepoints *basepoints,
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struct secrets *secrets,
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struct sha256 *shaseed,
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struct pubkey *per_commit_point,
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u64 per_commit_index);
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/* Give up secret for index-1, and generate per-commitment point for N+1. */
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bool next_per_commit_point(const struct sha256 *shaseed,
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struct sha256 *old_commit_secret,
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struct pubkey *per_commit_point,
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u64 per_commit_index);
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/* BOLT #3:
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*
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* the first secret used MUST be index 281474976710655, and then the index
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* decremented.
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*/
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static inline u64 shachain_index(u64 per_commit_index)
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{
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assert(per_commit_index < (1ULL << 48));
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return 281474976710655ULL - per_commit_index;
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}
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#endif /* LIGHTNING_LIGHTNINGD_DERIVE_BASEPOINTS_H */
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