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a83e45fec2
We currently make sure that all the bitcoin_tx input scripts are NULL and set the input script of the input we're signing, so we can easily reuse the tx hashing code for signature checks. This means that we sometimes jump through hoops to make sure input scripts are NULL, and also means that the tx can't be const. Put more logic inside bitcoin/tx so it can simply ignore things we don't want to hash. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
80 lines
2.1 KiB
C
80 lines
2.1 KiB
C
#ifndef LIGHTNING_BITCOIN_TX_H
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#define LIGHTNING_BITCOIN_TX_H
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#include "config.h"
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#include "shadouble.h"
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#include "signature.h"
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#include "varint.h"
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#include <ccan/short_types/short_types.h>
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#include <ccan/structeq/structeq.h>
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#include <ccan/tal/tal.h>
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struct bitcoin_txid {
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struct sha256_double shad;
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};
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/* Define bitcoin_txid_eq */
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STRUCTEQ_DEF(bitcoin_txid, 0, shad.sha.u);
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struct bitcoin_tx {
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u32 version;
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struct bitcoin_tx_input *input;
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struct bitcoin_tx_output *output;
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u32 lock_time;
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};
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struct bitcoin_tx_output {
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u64 amount;
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u8 *script;
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};
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struct bitcoin_tx_input {
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struct bitcoin_txid txid;
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u32 index; /* output number referred to by above */
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u8 *script;
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u32 sequence_number;
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/* Value of the output we're spending (NULL if unknown). */
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u64 *amount;
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/* Only if BIP141 used. */
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u8 **witness;
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};
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/* SHA256^2 the tx: simpler than sha256_tx */
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void bitcoin_txid(const struct bitcoin_tx *tx, struct bitcoin_txid *txid);
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/* Useful for signature code. */
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void sha256_tx_for_sig(struct sha256_double *h, const struct bitcoin_tx *tx,
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unsigned int input_num,
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const u8 *script,
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const u8 *witness_script);
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/* Linear bytes of tx. */
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u8 *linearize_tx(const tal_t *ctx, const struct bitcoin_tx *tx);
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/* Get weight of tx in Sipa. */
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size_t measure_tx_weight(const struct bitcoin_tx *tx);
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/* Allocate a tx: you just need to fill in inputs and outputs (they're
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* zeroed with inputs' sequence_number set to FFFFFFFF) */
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struct bitcoin_tx *bitcoin_tx(const tal_t *ctx, varint_t input_count,
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varint_t output_count);
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/* This takes a raw bitcoin tx in hex. */
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struct bitcoin_tx *bitcoin_tx_from_hex(const tal_t *ctx, const char *hex,
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size_t hexlen);
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/* Parse hex string to get txid (reversed, a-la bitcoind). */
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bool bitcoin_txid_from_hex(const char *hexstr, size_t hexstr_len,
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struct bitcoin_txid *txid);
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/* Get hex string of txid (reversed, a-la bitcoind). */
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bool bitcoin_txid_to_hex(const struct bitcoin_txid *txid,
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char *hexstr, size_t hexstr_len);
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/* Internal de-linearization functions. */
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struct bitcoin_tx *pull_bitcoin_tx(const tal_t *ctx,
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const u8 **cursor, size_t *max);
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#endif /* LIGHTNING_BITCOIN_TX_H */
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