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wally: Use libwally only to serialize transactions

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Signed-off-by: Christian Decker <decker.christian@gmail.com>
This commit is contained in:
Christian Decker 2019-03-22 17:52:15 +01:00 committed by Rusty Russell
parent 9fe481b967
commit 3ae19479a8
1 changed files with 10 additions and 51 deletions
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61
bitcoin/tx.c
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@ -122,23 +122,6 @@ void bitcoin_tx_input_set_script(struct bitcoin_tx *tx, int innum, u8 *script)
wally_tx_set_input_script(tx->wtx, innum, script, tal_bytelen(script));
}
static void push_tx_input(const struct bitcoin_tx_input *input,
const u8 *input_script,
void (*push)(const void *, size_t, void *), void *pushp)
{
push(&input->txid, sizeof(input->txid), pushp);
push_le32(input->index, push, pushp);
push_varint_blob(input_script, push, pushp);
push_le32(input->sequence_number, push, pushp);
}
static void push_tx_output(const struct bitcoin_tx_output *output,
void (*push)(const void *, size_t, void *), void *pushp)
{
push_amount_sat(output->amount, push, pushp);
push_varint_blob(output->script, push, pushp);
}
/* BIP 141:
* It is followed by stack items, with each item starts with a var_int
* to indicate the length. */
@ -202,45 +185,21 @@ static void push_tx(const struct bitcoin_tx *tx,
void (*push)(const void *, size_t, void *), void *pushp,
bool bip144)
{
varint_t i;
int res;
size_t len, written;
u8 *serialized;;
u8 flag = 0;
push_le32(tx->wtx->version, push, pushp);
if (bip144 && uses_witness(tx))
flag |= SEGREGATED_WITNESS_FLAG;
flag |= WALLY_TX_FLAG_USE_WITNESS;
/* BIP 141: The flag MUST be a 1-byte non-zero value. */
/* ie. if no flags set, we fallback to pre-BIP144-style */
if (flag) {
u8 marker = 0;
/* BIP 144 */
/* marker char Must be zero */
/* flag char Must be nonzero */
push(&marker, 1, pushp);
push(&flag, 1, pushp);
}
wally_tx_get_length(tx->wtx, flag, &len);
serialized = tal_arr(tmpctx, u8, len);
push_varint(tal_count(tx->input), push, pushp);
for (i = 0; i < tal_count(tx->input); i++) {
const u8 *input_script = tx->input[i].script;
if (override_script) {
if (input_num == i)
input_script = override_script;
else
input_script = NULL;
}
push_tx_input(&tx->input[i], input_script, push, pushp);
}
push_varint(tal_count(tx->output), push, pushp);
for (i = 0; i < tal_count(tx->output); i++)
push_tx_output(&tx->output[i], push, pushp);
if (flag & SEGREGATED_WITNESS_FLAG)
push_witnesses(tx, push, pushp);
push_le32(tx->wtx->locktime, push, pushp);
res = wally_tx_to_bytes(tx->wtx, flag, serialized, len, &written);
assert(res == WALLY_OK && len == written);
push(serialized, len, pushp);
tal_free(serialized);
}
static void push_sha(const void *data, size_t len, void *shactx_)