Coverage Summary for Class: Rskip92MerkleProofBuilder (co.rsk.mine)
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Rskip92MerkleProofBuilder |
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1 /*
2 * This file is part of RskJ
3 * Copyright (C) 2018 RSK Labs Ltd.
4 *
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU Lesser General Public License as published by
7 * the Free Software Foundation, either version 3 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General Public License
16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
17 */
18 package co.rsk.mine;
19
20 import co.rsk.bitcoinj.core.BtcBlock;
21 import co.rsk.bitcoinj.core.Sha256Hash;
22 import co.rsk.bitcoinj.core.Utils;
23 import co.rsk.peg.utils.PartialMerkleTreeFormatUtils;
24 import org.bouncycastle.util.encoders.Hex;
25 import org.ethereum.util.ByteUtil;
26
27 import java.util.List;
28 import java.util.stream.Stream;
29
30 /**
31 * Builds RSKIP 92 Merkle proofs
32 */
33 public class Rskip92MerkleProofBuilder implements MerkleProofBuilder {
34
35 @Override
36 public byte[] buildFromMerkleHashes(
37 BtcBlock blockWithHeaderOnly,
38 List<String> merkleHashesString,
39 int blockTxnCount) {
40 Stream<byte[]> hashesStream = merkleHashesString.stream()
41 .map(mh -> Utils.reverseBytes(Hex.decode(mh)));
42 return mergeHashes(hashesStream);
43 }
44
45 @Override
46 public byte[] buildFromTxHashes(BtcBlock blockWithHeaderOnly, List<String> txHashesString) {
47 return buildFromFullPmt(
48 new GenesisMerkleProofBuilder().buildFromTxHashes(blockWithHeaderOnly, txHashesString)
49 );
50 }
51
52 @Override
53 public byte[] buildFromBlock(BtcBlock bitcoinMergedMiningBlock) {
54 return buildFromFullPmt(
55 new GenesisMerkleProofBuilder().buildFromBlock(bitcoinMergedMiningBlock)
56 );
57 }
58
59 /**
60 * This takes a full PMT and slices and rearranges the needed pieces for the new serialization format.
61 * It would make sense to re-implement this as a standalone algorithm, but reusing the PMT is enough for now.
62 */
63 private byte[] buildFromFullPmt(byte[] pmtSerialized) {
64 Stream<byte[]> hashesStream = PartialMerkleTreeFormatUtils.streamIntermediateHashes(pmtSerialized)
65 .map(Sha256Hash::getBytes);
66 return mergeHashes(hashesStream);
67 }
68
69 private byte[] mergeHashes(Stream<byte[]> hashesStream) {
70 byte[][] hashes = hashesStream
71 .skip(1) // skip the coinbase
72 .toArray(byte[][]::new);
73 return ByteUtil.merge(hashes);
74 }
75 }