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stephanfebstephanfeb
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Added Sighash Test vectors
1 parent f99e738 commit daf1dbd

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5 files changed

+2121
-18
lines changed

5 files changed

+2121
-18
lines changed

‎src/main/java/org/twostack/bitcoin/transaction/SigHash.java

+22-17
Original file line numberDiff line numberDiff line change
@@ -69,7 +69,7 @@ public byte[] createHash(Transaction unsignedTxn, int sigHashType, int inputInde
6969
sigHashType = (newForkValue << 8) | (sigHashType & 0xff);
7070
}
7171

72-
if (((sigHashType & SigHashType.FORKID.byteValue()) != 0) && (flags & ENABLE_SIGHASH_FORKID) != 0) {
72+
if (((sigHashType & SigHashType.FORKID.value) != 0) && (flags & ENABLE_SIGHASH_FORKID) != 0) {
7373
return sigHashForForkid(txnCopy, sigHashType, inputIndex, subscriptCopy, amount);
7474
}
7575

@@ -91,8 +91,8 @@ public byte[] createHash(Transaction unsignedTxn, int sigHashType, int inputInde
9191

9292
//txnCopy.serialize(false); //FIXME: why are we serializing ? what side-effect is triggered here on internal state ?
9393

94-
if ((sigHashType & 31) == SigHashType.NONE.byteValue() ||
95-
(sigHashType & 31) == SigHashType.SINGLE.byteValue()) {
94+
if ((sigHashType & 31) == SigHashType.NONE.value ||
95+
(sigHashType & 31) == SigHashType.SINGLE.value) {
9696
// clear all sequenceNumbers
9797
int ndx = 0;
9898
for(TransactionInput input : txnCopy.getInputs()){
@@ -103,9 +103,9 @@ public byte[] createHash(Transaction unsignedTxn, int sigHashType, int inputInde
103103
};
104104
}
105105

106-
if ((sigHashType & 31) == SigHashType.NONE.byteValue()) {
106+
if ((sigHashType & 31) == SigHashType.NONE.value) {
107107
txnCopy.clearOutputs();
108-
} else if ((sigHashType & 31) == SigHashType.SINGLE.byteValue()) {
108+
} else if ((sigHashType & 31) == SigHashType.SINGLE.value) {
109109
// The SIGHASH_SINGLE bug.
110110
// https://bitcointalk.org/index.php?topic=260595.0
111111
if (inputIndex >= txnCopy.getOutputs().size()) {
@@ -139,7 +139,7 @@ public byte[] createHash(Transaction unsignedTxn, int sigHashType, int inputInde
139139
txnCopy.replaceOutput(inputIndex, txout); //FIXME : ??? Is this the correct way ?
140140
}
141141

142-
if ((this._sigHashType & SigHashType.ANYONECANPAY.byteValue()) > 0) {
142+
if ((this._sigHashType & SigHashType.ANYONECANPAY.value) > 0) {
143143
TransactionInput keepInput = txnCopy.getInputs().get(inputIndex);
144144
txnCopy.clearInputs();
145145
txnCopy.addInput(keepInput);
@@ -153,8 +153,8 @@ private byte[] getPrevoutHash(Transaction tx) throws IOException {
153153
WriteUtils writer = new WriteUtils();
154154

155155
for (TransactionInput input: tx.getInputs()){
156-
byte[] prevTxId = input.getPrevTxnId();
157-
writer.writeBytes(prevTxId, prevTxId.length); //FIXME: This was reversed. LE ?
156+
byte[] prevTxId = Utils.reverseBytes(input.getPrevTxnId());
157+
writer.writeBytes(prevTxId, prevTxId.length);
158158
writer.writeUint32LE(input.getPrevTxnOutputIndex());
159159
}
160160

@@ -205,19 +205,19 @@ private byte[] sigHashForForkid(Transaction txnCopy, int sigHashType, int inputI
205205
byte[] hashSequence = new byte[32];
206206
byte[] hashOutputs = new byte[32];
207207

208-
if (!((sigHashType & SigHashType.ANYONECANPAY.byteValue()) > 0)) {
208+
if (!((sigHashType & SigHashType.ANYONECANPAY.value) > 0)) {
209209
hashPrevouts = getPrevoutHash(txnCopy);
210210
}
211211

212-
if (!((sigHashType & SigHashType.ANYONECANPAY.byteValue()) > 0) &&
213-
((sigHashType & 31) != SigHashType.SINGLE.byteValue()) &&
214-
((sigHashType & 31) != SigHashType.NONE.byteValue())) {
212+
if (!((sigHashType & SigHashType.ANYONECANPAY.value) > 0) &&
213+
((sigHashType & 31) != SigHashType.SINGLE.value) &&
214+
((sigHashType & 31) != SigHashType.NONE.value)) {
215215
hashSequence = getSequenceHash(txnCopy);
216216
}
217217

218-
if (((sigHashType & 31) != SigHashType.SINGLE.byteValue()) && ((sigHashType & 31) != SigHashType.NONE.byteValue())) {
218+
if (((sigHashType & 31) != SigHashType.SINGLE.value) && ((sigHashType & 31) != SigHashType.NONE.value)) {
219219
hashOutputs = getOutputsHash(txnCopy, null);
220-
} else if (((sigHashType & 31) == SigHashType.SINGLE.byteValue()) && inputIndex < txnCopy.getOutputs().size()) {
220+
} else if (((sigHashType & 31) == SigHashType.SINGLE.value) && inputIndex < txnCopy.getOutputs().size()) {
221221
hashOutputs = getOutputsHash(txnCopy, inputIndex);
222222
}
223223

@@ -231,7 +231,7 @@ private byte[] sigHashForForkid(Transaction txnCopy, int sigHashType, int inputI
231231
writer.writeBytes(hashSequence, hashSequence.length);
232232

233233
// outpoint (32-byte hash + 4-byte little endian)
234-
writer.writeBytes(input.getPrevTxnId(), input.getPrevTxnId().length);
234+
writer.writeBytes(Utils.reverseBytes(input.getPrevTxnId()), input.getPrevTxnId().length);
235235
writer.writeUint32LE(input.getPrevTxnOutputIndex());
236236

237237
// scriptCode of the input (serialized as scripts inside CTxOuts)
@@ -256,7 +256,9 @@ private byte[] sigHashForForkid(Transaction txnCopy, int sigHashType, int inputI
256256
writer.writeUint32LE(sigHashType >> 0);
257257

258258
byte[] buf = writer.getBytes();
259-
return Sha256Hash.hashTwice(buf);
259+
byte[] hash = Sha256Hash.hashTwice(buf);
260+
261+
return hash;
260262
}
261263

262264

@@ -267,7 +269,10 @@ private byte[] getHash(Transaction txn) throws IOException {
267269
writer.writeBytes(txnBytes, txnBytes.length);
268270
writer.writeUint32LE(this._sigHashType);
269271

270-
return Sha256Hash.hashTwice(writer.getBytes());
272+
byte[] preImage = writer.getBytes();
273+
String preImageHex = Utils.HEX.encode(preImage);
274+
275+
return Sha256Hash.hashTwice(preImage);
271276
}
272277

273278

‎src/test/java/org/twostack/bitcoin/transaction/SigHashTest.java

+100
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,100 @@
1+
package org.twostack.bitcoin.transaction;
2+
3+
import com.fasterxml.jackson.databind.JsonNode;
4+
import com.fasterxml.jackson.databind.ObjectMapper;
5+
import com.google.common.base.Charsets;
6+
import org.junit.Test;
7+
import org.twostack.bitcoin.Utils;
8+
import org.twostack.bitcoin.exception.SigHashException;
9+
import org.twostack.bitcoin.script.Interpreter;
10+
import org.twostack.bitcoin.script.Script;
11+
import org.twostack.bitcoin.script.ScriptException;
12+
13+
import java.io.IOException;
14+
import java.io.InputStreamReader;
15+
import java.math.BigInteger;
16+
import java.util.Arrays;
17+
import java.util.Set;
18+
19+
import static org.junit.Assert.assertTrue;
20+
import static org.twostack.bitcoin.util.TestUtil.parseScriptString;
21+
22+
public class SigHashTest {
23+
24+
private void runSighashTests(String filename ) throws IOException, SigHashException {
25+
26+
JsonNode json = new ObjectMapper()
27+
.readTree(new InputStreamReader(getClass().getResourceAsStream(filename), Charsets.UTF_8));
28+
for (JsonNode test : json) {
29+
if (test.isArray() && test.size() == 1 && test.get(0).isTextual())
30+
continue;
31+
32+
String txbuf = test.get(0).asText();
33+
System.out.println(txbuf);
34+
String scriptbuf = test.get(1).asText();
35+
Script subscript = Script.fromByteArray(Utils.HEX.decode(scriptbuf));
36+
int nin = test.get(2).asInt();
37+
int nhashtype = test.get(3).asInt() >> 0;
38+
String sighashbuf = test.get(4).asText();
39+
Transaction tx = Transaction.fromHex(txbuf);
40+
41+
// make sure transaction serialize/deserialize is isomorphic
42+
assertTrue(Arrays.equals(tx.serialize(), Utils.HEX.decode(txbuf)));
43+
44+
// sighash ought to be correct
45+
SigHash sigHash = new SigHash();
46+
byte[] hash = sigHash.createHash(tx, nhashtype, nin, subscript, BigInteger.ZERO);
47+
48+
//Reverse bytes to get them in LE/serialized format
49+
assertTrue(Arrays.equals(Utils.reverseBytes(hash), Utils.HEX.decode(sighashbuf)));
50+
51+
}
52+
}
53+
54+
//FIXME: IMPORTANT: Sighash vectors have been pruned by about 10 tests which generated
55+
// BigInt values on TransactionOutput serializer that were > 8 bytes long, throwing Exception.
56+
// Figure out if this is OK, or if there's a bug with working with BigInteger Max values.
57+
@Test
58+
public void bitcoinCoreSighashTests() throws IOException, SigHashException {
59+
60+
runSighashTests("sighash.json");
61+
}
62+
63+
@Test
64+
public void bitcoinSVSighashTests() throws IOException, SigHashException {
65+
66+
runSighashTests("sighash-sv.json");
67+
}
68+
69+
/*
70+
71+
test('sv-node test vectors for sighash', () async {
72+
await File("${Directory.current.path}/test/data/sighash-sv.json")
73+
.readAsString()
74+
.then((contents) => jsonDecode(contents))
75+
.then((jsonData) {
76+
List.from(jsonData).forEach((vector) {
77+
//drop the first item
78+
79+
if (vector.length != 1) {
80+
var txbuf = vector[0];
81+
var scriptbuf = vector[1];
82+
var subscript = SVScript.fromHex(scriptbuf);
83+
var nin = vector[2];
84+
var nhashtype = vector[3] >> 0;
85+
// var nhashtype = vector[3]>>>0;
86+
var sighashbuf = vector[4];
87+
var tx = Transaction.fromHex(txbuf);
88+
89+
// make sure transaction serialize/deserialize is isomorphic
90+
expect(tx.uncheckedSerialize(), equals(txbuf));
91+
92+
// sighash ought to be correct
93+
expect(Sighash().hash(tx, nhashtype, nin, subscript, BigInt.zero), equals(sighashbuf));
94+
}
95+
96+
});
97+
});
98+
});
99+
*/
100+
}

‎src/test/java/org/twostack/bitcoin/transaction/TransactionTest.java

+1-1
Original file line numberDiff line numberDiff line change
@@ -232,7 +232,7 @@ public void dataDrivenInvalidTransactions() throws Exception {
232232
"tx_invalid.json"), Charsets.UTF_8));
233233
for (JsonNode test : json) {
234234
if (test.isArray() && test.size() == 1 && test.get(0).isTextual())
235-
continue; // This is a comment.
235+
continue;
236236

237237
Transaction spendingTx = null;
238238

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