Qortal/altcoinj
3
0
Fork 0
mirror of https://github.com/Qortal/altcoinj.git synced 2025-01-31 07:12:17 +00:00
Code Issues Projects Releases Wiki Activity

Fix extra signature added to the full scriptSig

Browse Source
This commit is contained in:
Kosta Korenkov 2014-09-09 22:07:33 +07:00
parent 3e5e3496ea
commit cf5089697b
2 changed files with 17 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
core/src/main/java/com/google/bitcoin/script/ScriptBuilder.java
View File

@ -203,7 +203,8 @@ public class ScriptBuilder {
/**
* Returns a copy of the given scriptSig with the signature inserted in the given position.
*
* This function assumes that any missing sigs have OP_0 placeholders.
* This function assumes that any missing sigs have OP_0 placeholders. If given scriptSig already has all the signatures
* in place, IllegalArgumentException will be thrown.
*
* @param targetIndex where to insert the signature
* @param sigsPrefixCount how many items to copy verbatim (e.g. initial OP_0 for multisig)
@ -215,6 +216,12 @@ public class ScriptBuilder {
List<ScriptChunk> inputChunks = scriptSig.getChunks();
int totalChunks = inputChunks.size();
// Check if we have a place to insert, otherwise just return given scriptSig unchanged.
// We assume here that OP_0 placeholders always go after the sigs, so
// to find if we have sigs missing, we can just check the chunk in latest sig position
boolean hasMissingSigs = inputChunks.get(totalChunks - sigsSuffixCount - 1).equalsOpCode(OP_0);
checkArgument(hasMissingSigs, "ScriptSig is already filled with signatures");
// copy the prefix
for (ScriptChunk chunk: inputChunks.subList(0, sigsPrefixCount))
builder.addChunk(chunk);

10
core/src/test/java/com/google/bitcoin/script/ScriptTest.java
View File

@ -153,7 +153,7 @@ public class ScriptTest {
}
@Test
public void testCreateEmptyInputScript() throws Exception {
public void createAndUpdateEmptyInputScript() throws Exception {
TransactionSignature dummySig = TransactionSignature.dummy();
ECKey key = new ECKey();
@ -196,6 +196,14 @@ public class ScriptTest {
assertThat(inputScript.getChunks().get(1).data, equalTo(dummySig.encodeToBitcoin()));
assertThat(inputScript.getChunks().get(2).data, equalTo(dummySig.encodeToBitcoin()));
assertThat(inputScript.getChunks().get(3).data, equalTo(multisigScript.getProgram()));
// updating scriptSig with no missing signatures
try {
ScriptBuilder.updateScriptWithSignature(inputScript, dummySig.encodeToBitcoin(), 1, 1, 1);
fail("Exception expected");
} catch (Exception e) {
assertEquals(IllegalArgumentException.class, e.getClass());
}
}
private Script parseScriptString(String string) throws IOException {