57 lines
1.7 KiB
C
57 lines
1.7 KiB
C
#include "bitcoin/pubkey.h"
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#include "bitcoin/script.h"
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#include "bitcoin/shadouble.h"
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#include "bitcoin/tx.h"
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#include "close_tx.h"
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#include "permute_tx.h"
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#include "protobuf_convert.h"
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struct bitcoin_tx *create_close_tx(const tal_t *ctx,
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OpenChannel *ours,
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OpenChannel *theirs,
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OpenAnchor *anchor,
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uint64_t to_us, uint64_t to_them)
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{
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struct bitcoin_tx *tx;
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const u8 *redeemscript;
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struct pubkey ourkey, theirkey;
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struct sha256 redeem;
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/* Now create close tx: one input, two outputs. */
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tx = bitcoin_tx(ctx, 1, 2);
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/* Our input spends the anchor tx output. */
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proto_to_sha256(anchor->txid, &tx->input[0].txid.sha);
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tx->input[0].index = anchor->output_index;
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tx->input[0].input_amount = anchor->amount;
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/* Outputs goes to final pubkey */
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if (!proto_to_pubkey(ours->final_key, &ourkey))
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return tal_free(tx);
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if (!proto_to_pubkey(theirs->final_key, &theirkey))
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return tal_free(tx);
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proto_to_sha256(ours->revocation_hash, &redeem);
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/* One output is to us. */
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tx->output[0].amount = to_us;
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redeemscript = bitcoin_redeem_single(tx, &ourkey);
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tx->output[0].script = scriptpubkey_p2sh(tx, redeemscript);
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tx->output[0].script_length = tal_count(tx->output[0].script);
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/* Other output is to them. */
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tx->output[1].amount = to_them;
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redeemscript = bitcoin_redeem_single(tx, &theirkey);
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tx->output[1].script = scriptpubkey_p2sh(tx, redeemscript);
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tx->output[1].script_length = tal_count(tx->output[1].script);
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assert(tx->output[0].amount + tx->output[1].amount
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<= tx->input[0].input_amount);
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tx->fee = tx->input[0].input_amount
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- (tx->output[0].amount + tx->output[1].amount);
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permute_outputs(tx->output, 2, NULL);
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return tx;
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}
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