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77 lines
2.4 KiB
77 lines
2.4 KiB
#ifndef LIGHTNING_COMMON_DERIVE_BASEPOINTS_H
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#define LIGHTNING_COMMON_DERIVE_BASEPOINTS_H
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#include "config.h"
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#include <assert.h>
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#include <bitcoin/privkey.h>
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#include <bitcoin/pubkey.h>
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#include <ccan/build_assert/build_assert.h>
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#include <ccan/crypto/shachain/shachain.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 htlc;
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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 htlc_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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*/
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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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/**
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* per_commit_secret - get a secret for this index.
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* @shaseed: the sha256 seed
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* @commit_secret: the returned per-commit secret.
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* @per_commit_index: (in) which @commit_secret to return.
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*/
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void per_commit_secret(const struct sha256 *shaseed,
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struct sha256 *commit_secret,
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u64 per_commit_index);
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/**
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* per_commit_point - get the per-commit-point for this index.
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* @shaseed: the sha256 seed
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* @commit_point: the returned per-commit point.
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* @per_commit_index: (in) which @commit_point to return.
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*/
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bool per_commit_point(const struct sha256 *shaseed,
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struct pubkey *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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BUILD_ASSERT((1ULL << SHACHAIN_BITS)-1 == 281474976710655);
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assert(per_commit_index < (1ULL << SHACHAIN_BITS));
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return (1ULL << SHACHAIN_BITS)-1 - per_commit_index;
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}
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static inline u64 revocations_received(const struct shachain *shachain)
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{
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return (1ULL << SHACHAIN_BITS) - (shachain_next_index(shachain) + 1);
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}
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#endif /* LIGHTNING_COMMON_DERIVE_BASEPOINTS_H */
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