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bitcoin_tx: bitcoin_txid_from_hex helper.

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Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2015-06-05 12:35:46 +09:30
parent e1532ce044
commit 6048a15db9
3 changed files with 30 additions and 16 deletions
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24
bitcoin_tx.c
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@ -287,3 +287,27 @@ struct bitcoin_tx *bitcoin_tx_from_file(const tal_t *ctx,
return tx;
}
/* <sigh>. Bitcoind represents hashes as little-endian for RPC. This didn't
* stick for blockids (everyone else uses big-endian, eg. block explorers),
* but it did stick for txids. */
static void reverse_bytes(u8 *arr, size_t len)
{
unsigned int i;
for (i = 0; i < len / 2; i++) {
unsigned char tmp = arr[i];
arr[i] = arr[len - 1 - i];
arr[len - 1 - i] = tmp;
}
}
bool bitcoin_txid_from_hex(const char *hexstr, size_t hexstr_len,
struct sha256_double *txid)
{
if (!hex_decode(hexstr, hexstr_len, txid, sizeof(*txid)))
return false;
reverse_bytes(txid->sha.u.u8, sizeof(txid->sha.u.u8));
return true;
}

4
bitcoin_tx.h
View File

@ -50,4 +50,8 @@ struct bitcoin_tx *bitcoin_tx(const tal_t *ctx, varint_t input_count,
struct bitcoin_tx *bitcoin_tx_from_file(const tal_t *ctx,
const char *filename);
/* Parse hex string to get txid (reversed, a-la bitcoind). */
bool bitcoin_txid_from_hex(const char *hexstr, size_t hexstr_len,
struct sha256_double *txid);
#endif /* LIGHTNING_BITCOIN_TX_H */

18
open-channel.c
View File

@ -14,6 +14,7 @@
#include "pkt.h"
#include "bitcoin_script.h"
#include "bitcoin_address.h"
#include "bitcoin_tx.h"
#include "pubkey.h"
#include "shadouble.h"
#include <openssl/ec.h>
@ -40,20 +41,6 @@ static void opt_show_bits(char buf[OPT_SHOW_LEN], const u64 *bits)
opt_show_ulonglongval_si(buf, &ll);
}
/* <sigh>. Bitcoind represents hashes as little-endian for RPC. This didn't
* stick for blockids (everyone else uses big-endian, eg. block explorers),
* but it did stick for txids. */
static void reverse_bytes(u8 *arr, size_t len)
{
unsigned int i;
for (i = 0; i < len / 2; i++) {
unsigned char tmp = arr[i];
arr[i] = arr[len - 1 - i];
arr[len - 1 - i] = tmp;
}
}
static BitcoinInput *parse_anchor_input(const tal_t *ctx, const char *spec)
{
BitcoinInput *in = tal(ctx, BitcoinInput);
@ -68,9 +55,8 @@ static BitcoinInput *parse_anchor_input(const tal_t *ctx, const char *spec)
if (!slash)
errx(1, "Expected / in <txid>/<num>/<satoshis>/<hexscript>");
if (!hex_decode(spec, slash - spec, &txid, sizeof(txid)))
if (!bitcoin_txid_from_hex(spec, slash - spec, &txid))
errx(1, "Expected 256-bit hex txid before /");
reverse_bytes(txid.sha.u.u8, sizeof(txid.sha.u.u8));
in->txid = sha256_to_proto(in, &txid.sha);
in->output = l = strtol(slash + 1, &end, 10);