mirror of
https://github.com/ElementsProject/lightning.git
synced 2024-11-19 18:11:28 +01:00
85ff95e829
To avoid everything pulling in HTLCs stuff to the opening daemon, we split the channel and commit_tx routines into initial_channel and initial_commit_tx (no HTLC support) and move full HTLC supporting versions into channeld. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
83 lines
2.1 KiB
C
83 lines
2.1 KiB
C
#include <assert.h>
|
|
#include <ccan/crypto/hkdf_sha256/hkdf_sha256.h>
|
|
#include <ccan/crypto/sha256/sha256.h>
|
|
#include <ccan/crypto/shachain/shachain.h>
|
|
#include <common/derive_basepoints.h>
|
|
#include <common/utils.h>
|
|
|
|
bool derive_basepoints(const struct privkey *seed,
|
|
struct pubkey *funding_pubkey,
|
|
struct basepoints *basepoints,
|
|
struct secrets *secrets,
|
|
struct sha256 *shaseed)
|
|
{
|
|
struct keys {
|
|
struct privkey f, r, p, d;
|
|
struct sha256 shaseed;
|
|
} keys;
|
|
|
|
hkdf_sha256(&keys, sizeof(keys), NULL, 0, seed, sizeof(*seed),
|
|
"c-lightning", strlen("c-lightning"));
|
|
|
|
if (secrets) {
|
|
secrets->funding_privkey = keys.f;
|
|
secrets->revocation_basepoint_secret = keys.r.secret;
|
|
secrets->payment_basepoint_secret = keys.p.secret;
|
|
secrets->delayed_payment_basepoint_secret = keys.d.secret;
|
|
}
|
|
|
|
if (funding_pubkey) {
|
|
if (!pubkey_from_privkey(&keys.f, funding_pubkey))
|
|
return false;
|
|
}
|
|
|
|
if (basepoints) {
|
|
if (!pubkey_from_privkey(&keys.r, &basepoints->revocation)
|
|
|| !pubkey_from_privkey(&keys.p, &basepoints->payment)
|
|
|| !pubkey_from_privkey(&keys.d, &basepoints->delayed_payment))
|
|
return false;
|
|
}
|
|
|
|
/* BOLT #3:
|
|
*
|
|
* A node MUST select an unguessable 256-bit seed for each connection,
|
|
* and MUST NOT reveal the seed.
|
|
*/
|
|
if (shaseed)
|
|
*shaseed = keys.shaseed;
|
|
|
|
return true;
|
|
}
|
|
|
|
void per_commit_secret(const struct sha256 *shaseed,
|
|
struct sha256 *commit_secret,
|
|
u64 per_commit_index)
|
|
{
|
|
shachain_from_seed(shaseed, shachain_index(per_commit_index),
|
|
commit_secret);
|
|
}
|
|
|
|
bool per_commit_point(const struct sha256 *shaseed,
|
|
struct pubkey *commit_point,
|
|
u64 per_commit_index)
|
|
{
|
|
struct sha256 per_commit_secret;
|
|
|
|
/* Derive new per-commitment-point. */
|
|
shachain_from_seed(shaseed, shachain_index(per_commit_index),
|
|
&per_commit_secret);
|
|
|
|
/* BOLT #3:
|
|
*
|
|
* The `per_commitment_point` is generated using EC multiplication:
|
|
*
|
|
* per_commitment_point = per_commitment_secret * G
|
|
*/
|
|
if (secp256k1_ec_pubkey_create(secp256k1_ctx,
|
|
&commit_point->pubkey,
|
|
per_commit_secret.u.u8) != 1)
|
|
return false;
|
|
|
|
return true;
|
|
}
|