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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;
}