Function derive_tmp_channel_id

common/channel_id.c:51–67

}

void derive_tmp_channel_id(struct channel_id *channel_id,
			   const struct pubkey *opener_basepoint)
{
	struct sha256 sha;

	/* BOLT-f53ca2301232db780843e894f55d95d512f297f9 #2:
	 * If the peer's revocation basepoint is unknown
	 * (e.g. `open_channel2`), a temporary `channel_id` should be
	 * found by using a zeroed out basepoint for the unknown peer.
	 */
	u8 der_keys[PUBKEY_CMPR_LEN * 2];
	memset(der_keys, 0, PUBKEY_CMPR_LEN);
	pubkey_to_der(der_keys + PUBKEY_CMPR_LEN, opener_basepoint);
	sha256(&sha, der_keys, sizeof(der_keys));
	BUILD_ASSERT(sizeof(*channel_id) == sizeof(sha));
	memcpy(channel_id, &sha, sizeof(*channel_id));
}

/* BOLT #2:
 *