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daemon: permute input in steal transaction.

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This is just generally good practice.  All our other txs are single-input,
so we've not needed to permute inputs before.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2016-05-06 16:22:11 +09:30
parent 082eaf406e
commit 604122e787
1 changed files with 8 additions and 2 deletions
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10
daemon/peer.c
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@ -11,6 +11,7 @@
#include "log.h"
#include "names.h"
#include "peer.h"
#include "permute_tx.h"
#include "pseudorand.h"
#include "secrets.h"
#include "state.h"
@ -888,6 +889,7 @@ static void resolve_cheating(struct peer *peer)
struct bitcoin_tx *steal_tx;
u8 **wscripts;
size_t i, n, num_to_steal;
int *map;
peer->closing_onchain.resolved
= tal_arrz(tx, const struct bitcoin_tx *, tal_count(ci->map));
@ -988,14 +990,18 @@ static void resolve_cheating(struct peer *peer)
}
assert(n == num_to_steal);
/* This obscures the order in which HTLCs were received, at least. */
map = tal_arr(steal_tx, int, num_to_steal);
permute_inputs(steal_tx->input, steal_tx->input_count, map);
/* Now, we can sign them all (they're all of same form). */
for (n = 0; n < num_to_steal; n++) {
struct bitcoin_signature sig;
sig.stype = SIGHASH_ALL;
peer_sign_steal_input(peer, steal_tx, n, wscripts[n], &sig.sig);
peer_sign_steal_input(peer, steal_tx, map[n], wscripts[n], &sig.sig);
steal_tx->input[n].witness
steal_tx->input[map[n]].witness
= bitcoin_witness_secret(steal_tx,
ci->revocation_preimage,
sizeof(*ci->revocation_preimage),