We need this for signing segwitness txs. Unfortunately, we don't have it
for transactions we received as hex, only ones we created; to make this safe
we use a pointer which is NULL if we don't know, and those will crash if
we try to sign or check their sigs.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This could only happen via our RPC interface (bitcoind should not give
us bad txs!) but it's better to be robust.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
We got the -> second translation wrong by a factor of 512, and also we
need to move the median time in our tests otherwise bitcoind won't let
us spend the tx.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Without Alpha, it's superfluous. We're about to add segwit support,
but linearization requires a more powerful approach, and segwit
signature checking is completely different and really deserves its
own function.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
I had already disabled it, and this clears the decks for Segregated Witness
which gives us everything we want.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
We don't want to re-create them internally, ever.
The test-cli tools are patched to generate them all the time, but
they're not performance critical.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
All the members of the transaction should be allocated off the
transaction, as they have the same lifetime.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
I got confused navigating these, especially since Alpha and Bitcoin
have diverged (BIP68 was proposed after Elements Alpha).
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
The format for both the nSequence field and the stack arg for
OP_CHECKSEQUENCEVERIFY is either:
Time-relative: [Bit 22 = 1] 00000 <time-shifted-by-9>
Block-relative: [Bit 22 = 0] 00000 <number of blocks>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This happens for CSV, for example (3-byte encoding), and bitcoind treats
too-long encodings as non-standard.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
The libsecp change broke signature checking. Disable it for now,
with a big FIXME. The next version should have a method for S value
checking, and also compact serialization.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
The latest version of the BIP doesn't use inversion, but does use
bitshifts.
It also uncovered a bug in the test scripts: the block timestamps
creep forward when we generate large numbers of blocks (UpdateTime
insists it be > GetMedianTimePast() so it's valid). We need to take
this into account when waiting for the median to move (reduced it from
60 to 30 seconds, since that adds about 14 seconds).
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
As documented in the paper; it's also two bytes shorter, and allows
us to use the exact same script for three cases.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
It doesn't matter until we start setting sequence numbers properly,
so hasn't been noticed until now.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
The even-S check was based on https://github.com/sipa/bitcoin/commit/a81cd9680
which was replaced by a low-S check in commit e0e14e43d9586409e42919f6cb955540134cda2a
Abstract out and fix the check.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Rusty Russell