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1eb3c9d2b3
This is mainly used to filter for transactions that may be of interest to us, i.e., whether one of our keys is the recipient. It currently does onyl simple scriptpubkey checks, but will eventually be extended to use bloomfilters and add more sophisticated checks. For now the goal is to speed up the processing of blocks during startup. Signed-off-by: Christian Decker <decker.christian@gmail.com>
55 lines
1.3 KiB
C
55 lines
1.3 KiB
C
#include "txfilter.h"
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#include <bitcoin/script.h>
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#include <ccan/crypto/ripemd160/ripemd160.h>
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#include <common/utils.h>
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struct txfilter {
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u8 **scriptpubkeys;
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};
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struct txfilter *txfilter_new(const tal_t *ctx)
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{
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struct txfilter *filter = tal(ctx, struct txfilter);
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filter->scriptpubkeys = tal_arr(filter, u8*, 0);
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return filter;
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}
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static void txfilter_add_scriptpubkey(struct txfilter *filter, u8 *script)
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{
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size_t count = tal_count(filter->scriptpubkeys);
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tal_resize(&filter->scriptpubkeys, count + 1);
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filter->scriptpubkeys[count] = tal_dup_arr(filter, u8, script, tal_len(script), 0);
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}
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void txfilter_add_derkey(struct txfilter *filter, u8 derkey[33])
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{
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tal_t *tmpctx = tal_tmpctx(filter);
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u8 *skp, *p2sh;
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skp = scriptpubkey_p2wpkh_derkey(tmpctx, derkey);
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p2sh = scriptpubkey_p2sh(tmpctx, skp);
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txfilter_add_scriptpubkey(filter, take(skp));
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txfilter_add_scriptpubkey(filter, take(p2sh));
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tal_free(tmpctx);
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}
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bool txfilter_match(const struct txfilter *filter, const struct bitcoin_tx *tx)
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{
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u8 *oscript;
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for (size_t i = 0; i < tal_count(tx->output); i++) {
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oscript = tx->output[i].script;
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for (size_t j = 0; j < tal_count(filter->scriptpubkeys); j++) {
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if (scripteq(oscript, filter->scriptpubkeys[j]))
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return true;
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}
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}
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return false;
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}
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