108 lines
3.1 KiB
C
108 lines
3.1 KiB
C
#include "common/psbt_internal.h"
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#include <bitcoin/script.h>
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#include <ccan/ccan/tal/tal.h>
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#include <common/psbt_open.h>
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#include <wally_psbt.h>
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#include <wire/peer_wire.h>
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#if EXPERIMENTAL_FEATURES
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static void
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psbt_input_set_final_witness_stack(const tal_t *ctx,
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struct wally_psbt_input *in,
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const struct witness_element **elements)
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{
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tal_wally_start();
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wally_tx_witness_stack_init_alloc(tal_count(elements),
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&in->final_witness);
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for (size_t i = 0; i < tal_count(elements); i++)
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wally_tx_witness_stack_add(in->final_witness,
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elements[i]->witness,
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tal_bytelen(elements[i]->witness));
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tal_wally_end(ctx);
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}
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void psbt_finalize_input(const tal_t *ctx,
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struct wally_psbt_input *in,
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const struct witness_element **elements)
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{
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psbt_input_set_final_witness_stack(ctx, in, elements);
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/* There's this horrible edgecase where we set the final_witnesses
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* directly onto the PSBT, but the input is a P2SH-wrapped input
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* (which has redeemscripts that belong in the scriptsig). Because
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* of how the internal libwally stuff works calling 'finalize'
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* on these just .. ignores it!? Murder. Anyway, here we do a final
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* scriptsig check -- if there's a redeemscript field still around we
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* just go ahead and mush it into the final_scriptsig field. */
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if (in->redeem_script) {
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u8 *redeemscript = tal_dup_arr(NULL, u8,
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in->redeem_script,
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in->redeem_script_len, 0);
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in->final_scriptsig =
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bitcoin_scriptsig_redeem(NULL,
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take(redeemscript));
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in->final_scriptsig_len =
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tal_bytelen(in->final_scriptsig);
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in->redeem_script = tal_free(in->redeem_script);
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in->redeem_script_len = 0;
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}
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}
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const struct witness_stack **
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psbt_to_witness_stacks(const tal_t *ctx,
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const struct wally_psbt *psbt,
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enum tx_role side_to_stack)
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{
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size_t stack_index;
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u64 serial_id;
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const struct witness_stack **stacks
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= tal_arr(ctx, const struct witness_stack *, psbt->num_inputs);
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stack_index = 0;
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for (size_t i = 0; i < psbt->num_inputs; i++) {
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if (!psbt_get_serial_id(&psbt->inputs[i].unknowns,
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&serial_id))
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/* FIXME: throw an error ? */
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return NULL;
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/* BOLT-78de9a79b491ae9fb84b1fdb4546bacf642dce87 #2:
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* - if is the `initiator`:
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* - MUST send even `serial_id`s
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*/
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if (serial_id % 2 == side_to_stack) {
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struct wally_tx_witness_stack *wtx_s =
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psbt->inputs[i].final_witness;
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struct witness_stack *stack =
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tal(stacks, struct witness_stack);
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/* Convert the wally_tx_witness_stack to
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* a witness_stack entry */
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stack->witness_element =
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tal_arr(stack, struct witness_element *,
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wtx_s->num_items);
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for (size_t j = 0; j < tal_count(stack->witness_element); j++) {
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stack->witness_element[j] = tal(stack,
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struct witness_element);
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stack->witness_element[j]->witness =
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tal_dup_arr(stack, u8,
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wtx_s->items[j].witness,
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wtx_s->items[j].witness_len,
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0);
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}
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stacks[stack_index++] = stack;
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}
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}
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if (stack_index == 0)
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return tal_free(stacks);
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tal_resize(&stacks, stack_index);
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return stacks;
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}
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#endif /* EXPERIMENTAL_FEATURES */
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