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libhsmd: Migrate handle_get_per_commitment_point

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This commit is contained in:
Christian Decker
2021-04-21 21:00:53 +02:00
committed by Rusty Russell
parent eab4aeaed3
commit e7007a7f36
2 changed files with 43 additions and 49 deletions
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43
hsmd/libhsmd.c
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@@ -721,6 +721,46 @@ static u8 *handle_channel_update_sig(struct hsmd_client *c, const u8 *msg_in)
return towire_hsmd_cupdate_sig_reply(NULL, cu);
}
/*~ This get the Nth a per-commitment point, and for N > 2, returns the
* grandparent per-commitment secret. This pattern is because after
* negotiating commitment N-1, we send them the next per-commitment point,
* and reveal the previous per-commitment secret as a promise not to spend
* the previous commitment transaction. */
static u8 *handle_get_per_commitment_point(struct hsmd_client *c, const u8 *msg_in)
{
struct secret channel_seed;
struct sha256 shaseed;
struct pubkey per_commitment_point;
u64 n;
struct secret *old_secret;
if (!fromwire_hsmd_get_per_commitment_point(msg_in, &n))
return hsmd_status_malformed_request(c, msg_in);
get_channel_seed(&c->id, c->dbid, &channel_seed);
if (!derive_shaseed(&channel_seed, &shaseed))
return hsmd_status_bad_request(c, msg_in, "bad derive_shaseed");
if (!per_commit_point(&shaseed, &per_commitment_point, n))
return hsmd_status_bad_request_fmt(
c, msg_in, "bad per_commit_point %" PRIu64, n);
if (n >= 2) {
old_secret = tal(tmpctx, struct secret);
if (!per_commit_secret(&shaseed, old_secret, n - 2)) {
return hsmd_status_bad_request_fmt(
c, msg_in, "Cannot derive secret %" PRIu64, n - 2);
}
} else
old_secret = NULL;
/*~ hsm_client_wire.csv marks the secret field here optional, so it only
* gets included if the parameter is non-NULL. We violate 80 columns
* pretty badly here, but it's a recommendation not a religion. */
return towire_hsmd_get_per_commitment_point_reply(
NULL, &per_commitment_point, old_secret);
}
u8 *hsmd_handle_client_message(const tal_t *ctx, struct hsmd_client *client,
const u8 *msg)
{
@@ -753,7 +793,6 @@ u8 *hsmd_handle_client_message(const tal_t *ctx, struct hsmd_client *client,
case WIRE_HSMD_SIGN_REMOTE_HTLC_TO_US:
case WIRE_HSMD_SIGN_PENALTY_TO_US:
case WIRE_HSMD_SIGN_LOCAL_HTLC_TX:
case WIRE_HSMD_GET_PER_COMMITMENT_POINT:
case WIRE_HSMD_SIGN_REMOTE_COMMITMENT_TX:
case WIRE_HSMD_SIGN_REMOTE_HTLC_TX:
case WIRE_HSMD_SIGN_MUTUAL_CLOSE_TX:
@@ -780,6 +819,8 @@ u8 *hsmd_handle_client_message(const tal_t *ctx, struct hsmd_client *client,
return handle_sign_node_announcement(client, msg);
case WIRE_HSMD_CUPDATE_SIG_REQ:
return handle_channel_update_sig(client, msg);
case WIRE_HSMD_GET_PER_COMMITMENT_POINT:
return handle_get_per_commitment_point(client, msg);
case WIRE_HSMD_DEV_MEMLEAK:
case WIRE_HSMD_ECDH_RESP: