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#ifndef LIGHTNING_COMMON_DERIVE_BASEPOINTS_H
#define LIGHTNING_COMMON_DERIVE_BASEPOINTS_H
#include "config.h"
#include <assert.h>
#include <bitcoin/privkey.h>
#include <bitcoin/pubkey.h>
#include <ccan/build_assert/build_assert.h>
#include <ccan/crypto/shachain/shachain.h>
struct sha256;
struct basepoints {
struct pubkey revocation;
struct pubkey payment;
struct pubkey htlc;
struct pubkey delayed_payment;
};
struct secrets {
struct privkey funding_privkey;
struct secret revocation_basepoint_secret;
struct secret payment_basepoint_secret;
struct secret htlc_basepoint_secret;
struct secret delayed_payment_basepoint_secret;
};
/**
* derive_basepoints - given a (per-peer) seed, get the basepoints
* @seed: (in) seed (derived by master daemon from counter and main seed)
* @funding_pubkey: (out) pubkey for funding tx output (if non-NULL)
* @basepoints: (out) basepoints for channel (if non-NULL)
* @secrets: (out) basepoints for channel (if non-NULL)
* @shaseed: (out) seed for shachain (if non-NULL)
*/
bool derive_basepoints(const struct privkey *seed,
struct pubkey *funding_pubkey,
struct basepoints *basepoints,
struct secrets *secrets,
struct sha256 *shaseed);
/**
* per_commit_secret - get a secret for this index.
* @shaseed: the sha256 seed
* @commit_secret: the returned per-commit secret.
* @per_commit_index: (in) which @commit_secret to return.
*/
void per_commit_secret(const struct sha256 *shaseed,
struct sha256 *commit_secret,
u64 per_commit_index);
/**
* per_commit_point - get the per-commit-point for this index.
* @shaseed: the sha256 seed
* @commit_point: the returned per-commit point.
* @per_commit_index: (in) which @commit_point to return.
*/
bool per_commit_point(const struct sha256 *shaseed,
struct pubkey *commit_point,
u64 per_commit_index);
/* BOLT #3:
*
* the first secret used MUST be index 281474976710655, and then the index
* decremented.
*/
static inline u64 shachain_index(u64 per_commit_index)
{
BUILD_ASSERT((1ULL << SHACHAIN_BITS)-1 == 281474976710655);
assert(per_commit_index < (1ULL << SHACHAIN_BITS));
return (1ULL << SHACHAIN_BITS)-1 - per_commit_index;
}
static inline u64 revocations_received(const struct shachain *shachain)
{
return (1ULL << SHACHAIN_BITS) - (shachain_next_index(shachain) + 1);
}
#endif /* LIGHTNING_COMMON_DERIVE_BASEPOINTS_H */