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common/derive_basepoints: complete the set of single-value derive functions.

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This helps make it explicit what we're deriving; these two were missing.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2018-07-23 11:53:02 +09:30 • committed by Christian Decker
parent dd2773dfc0
commit 5d815238cf
3 changed files with 91 additions and 3 deletions
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46
common/derive_basepoints.c
View file

@ -166,6 +166,52 @@ bool derive_funding_key(const struct secret *seed,
return true;
}
bool derive_revocation_basepoint(const struct secret *seed,
struct pubkey *revocation_basepoint,
struct secret *revocation_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 (revocation_basepoint) {
if (!pubkey_from_privkey(&keys.r, revocation_basepoint))
return false;
}
if (revocation_secret)
*revocation_secret = keys.r.secret;
return true;
}
bool derive_htlc_basepoint(const struct secret *seed,
struct pubkey *htlc_basepoint,
struct secret *htlc_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 (htlc_basepoint) {
if (!pubkey_from_privkey(&keys.h, htlc_basepoint))
return false;
}
if (htlc_secret)
*htlc_secret = keys.h.secret;
return true;
}
void towire_basepoints(u8 **pptr, const struct basepoints *b)
{
towire_pubkey(pptr, &b->revocation);

30
common/derive_basepoints.h
View file

@ -39,7 +39,7 @@ bool derive_basepoints(const struct secret *seed,
struct sha256 *shaseed);
/**
* derive_funding_key - give a (per-peer) seed, get just funding key
* derive_funding_key - given a (per-peer) seed, get just funding key
* @seed: (in) seed (derived by master daemon from counter and main seed)
* @funding_pubkey: (out) pubkey for funding tx output (if non-NULL)
* @funding_privkey: (out) privkey for funding tx output (if non-NULL)
@ -51,7 +51,7 @@ bool derive_funding_key(const struct secret *seed,
struct privkey *funding_privkey);
/**
* derive_payment_basepoint - give a (per-channel) seed, get just payment basepoint
* derive_payment_basepoint - given a (per-channel) seed, get just payment basepoint
* @seed: (in) seed (derived by master daemon from counter and main seed)
* @payment_basepoint: (out) basepoint for payment output (if non-NULL)
* @payment_secret: (out) secret for payment basepoint (if non-NULL)
@ -63,7 +63,7 @@ bool derive_payment_basepoint(const struct secret *seed,
struct secret *payment_secret);
/**
* derive_shaseed - give a (per-peer) seed, get just the shaseed
* derive_shaseed - given a (per-peer) seed, get just the shaseed
* @seed: (in) seed (derived by master daemon from counter and main seed)
* @shaseed: (out) seed for shachain
*
@ -83,6 +83,30 @@ bool derive_delayed_payment_basepoint(const struct secret *seed,
struct pubkey *delayed_payment_basepoint,
struct secret *delayed_payment_secret);
/**
* derive_revocation_basepoint - given a (per-channel) seed, get just revocation basepoint
* @seed: (in) seed (derived by master daemon from counter and main seed)
* @payment_basepoint: (out) basepoint for revocation keys (if non-NULL)
* @payment_secret: (out) secret for revocation keys (if non-NULL)
*
* This is a cut-down version of derive_basepoints.
*/
bool derive_revocation_basepoint(const struct secret *seed,
struct pubkey *revocation_basepoint,
struct secret *revocation_secret);
/**
* derive_htlc_basepoint - give a (per-channel) seed, get just htlc basepoint
* @seed: (in) seed (derived by master daemon from counter and main seed)
* @htlc_basepoint: (out) basepoint for htlc output (if non-NULL)
* @htlc_secret: (out) secret for htlc basepoint (if non-NULL)
*
* This is a cut-down version of derive_basepoints.
*/
bool derive_htlc_basepoint(const struct secret *seed,
struct pubkey *htlc_basepoint,
struct secret *htlc_secret);
/**
* per_commit_secret - get a secret for this index.
* @shaseed: the sha256 seed

18
common/test/run-derive_basepoints.c
View file

@ -151,6 +151,24 @@ int main(void)
assert(derive_shaseed(&info->seed, &info->shaseed));
assert(sha256_eq(&baseline->shaseed, &info->shaseed));
/* derive_revocation_basepoint should give same results. */
info = new_info(ctx);
assert(derive_revocation_basepoint(&info->seed, &info->basepoints.revocation,
&info->secrets.revocation_basepoint_secret));
assert(pubkey_eq(&baseline->basepoints.revocation,
&info->basepoints.revocation));
assert(secret_eq(&baseline->secrets.revocation_basepoint_secret,
&info->secrets.revocation_basepoint_secret));
/* derive_htlc_basepoint should give same results. */
info = new_info(ctx);
assert(derive_htlc_basepoint(&info->seed, &info->basepoints.htlc,
&info->secrets.htlc_basepoint_secret));
assert(pubkey_eq(&baseline->basepoints.htlc,
&info->basepoints.htlc));
assert(secret_eq(&baseline->secrets.htlc_basepoint_secret,
&info->secrets.htlc_basepoint_secret));
tal_free(ctx);
wally_cleanup(0);
return 0;