#include "commit_tx.h" #include "shadouble.h" #include "bitcoin_tx.h" #include "bitcoin_script.h" #include "permute_tx.h" struct bitcoin_tx *create_commit_tx(const tal_t *ctx, OpenChannel *ours, OpenChannel *theirs, const struct sha256_double *anchor_txid, unsigned int anchor_output) { struct bitcoin_tx *tx; const u8 *redeemscript; /* Now create commitment tx: one input, two outputs. */ tx = bitcoin_tx(ctx, 1, 2); /* Our input spends the anchor tx output. */ tx->input[0].txid = *anchor_txid; tx->input[0].index = anchor_output; /* First output is a P2SH to a complex redeem script (usu. for me) */ redeemscript = bitcoin_redeem_revocable(tx, ours->anchor->pubkey, ours->locktime_seconds, theirs->anchor->pubkey, ours->revocation_hash); tx->output[0].script = scriptpubkey_p2sh(tx, redeemscript); tx->output[0].script_length = tal_count(tx->output[0].script); if (ours->anchor->total < ours->commitment_fee) return tal_free(tx); tx->output[0].amount = ours->anchor->total - ours->commitment_fee; /* Second output is a simple payment to them. */ tx->output[1].script = theirs->script_to_me.data; tx->output[1].script_length = theirs->script_to_me.len; if (theirs->anchor->total < theirs->commitment_fee) return tal_free(tx); tx->output[1].amount = theirs->anchor->total - theirs->commitment_fee; permute_outputs(ours->seed, theirs->seed, 1, tx->output, 2, NULL); return tx; }