aljaz/lightning
1
0
Fork 0
mirror of https://github.com/aljazceru/lightning.git synced 2026-01-06 07:34:21 +01:00
Code Issues Packages Projects Releases Wiki Activity

common/derive_basepoints: add routines to get a specific secret.

Browse Source 
Often we only need a single secret, so it's clearer to have routines
to do just that.  When we change to the lnd key scheme, there will be
no benefit in calculating them all together.

This also adds a test!

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2018-07-09 20:47:59 +09:30
committed by Christian Decker
parent b2b85100d7
commit 64008e275a
3 changed files with 281 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

79
common/derive_basepoints.c
View File

@@ -87,6 +87,85 @@ bool per_commit_point(const struct sha256 *shaseed,
return true;
}
bool derive_payment_basepoint(const struct secret *seed,
struct pubkey *payment_basepoint,
struct secret *payment_secret)
{
struct keys {
struct privkey f, r, h, p, d;
struct sha256 shaseed;
} keys;
hkdf_sha256(&keys, sizeof(keys), NULL, 0, seed, sizeof(*seed),
"c-lightning", strlen("c-lightning"));
if (payment_basepoint) {
if (!pubkey_from_privkey(&keys.p, payment_basepoint))
return false;
}
if (payment_secret)
*payment_secret = keys.p.secret;
return true;
}
bool derive_delayed_payment_basepoint(const struct secret *seed,
struct pubkey *delayed_payment_basepoint,
struct secret *delayed_payment_secret)
{
struct keys {
struct privkey f, r, h, p, d;
struct sha256 shaseed;
} keys;
hkdf_sha256(&keys, sizeof(keys), NULL, 0, seed, sizeof(*seed),
"c-lightning", strlen("c-lightning"));
if (delayed_payment_basepoint) {
if (!pubkey_from_privkey(&keys.d, delayed_payment_basepoint))
return false;
}
if (delayed_payment_secret)
*delayed_payment_secret = keys.d.secret;
return true;
}
bool derive_shaseed(const struct secret *seed, struct sha256 *shaseed)
{
struct keys {
struct privkey f, r, h, p, d;
struct sha256 shaseed;
} keys;
hkdf_sha256(&keys, sizeof(keys), NULL, 0, seed, sizeof(*seed),
"c-lightning", strlen("c-lightning"));
*shaseed = keys.shaseed;
return true;
}
bool derive_funding_key(const struct secret *seed,
struct pubkey *funding_pubkey,
struct privkey *funding_privkey)
{
struct privkey f;
hkdf_sha256(&f, sizeof(f), NULL, 0, seed, sizeof(*seed),
"c-lightning", strlen("c-lightning"));
if (funding_pubkey) {
if (!pubkey_from_privkey(&f, funding_pubkey))
return false;
}
if (funding_privkey)
*funding_privkey = f;
return true;
}
void towire_basepoints(u8 **pptr, const struct basepoints *b)
{
towire_pubkey(pptr, &b->revocation);