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ScriptBuilder: add a method that creates a multisig input script.

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This commit is contained in:
Mike Hearn 2013-04-26 13:51:00 +02:00
parent d537c8017a
commit 8a63fbd075
1 changed files with 14 additions and 2 deletions
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16
core/src/main/java/com/google/bitcoin/script/ScriptBuilder.java
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@ -18,6 +18,7 @@ package com.google.bitcoin.script;
import com.google.bitcoin.core.Address; import com.google.bitcoin.core.Address;
import com.google.bitcoin.core.ECKey; import com.google.bitcoin.core.ECKey;
import com.google.bitcoin.core.Transaction;
import com.google.common.collect.Lists; import com.google.common.collect.Lists;
import java.util.Arrays; import java.util.Arrays;
@ -49,7 +50,7 @@ public class ScriptBuilder {
return this; return this;
} }
public ScriptBuilder smallNum(byte num) { public ScriptBuilder smallNum(int num) {
checkArgument(num >= 0, "Cannot encode negative numbers with smallNum"); checkArgument(num >= 0, "Cannot encode negative numbers with smallNum");
checkArgument(num <= 16, "Cannot encode numbers larger than 16 with smallNum"); checkArgument(num <= 16, "Cannot encode numbers larger than 16 with smallNum");
chunks.add(new ScriptChunk(true, new byte[]{(byte)Script.encodeToOpN(num)})); chunks.add(new ScriptChunk(true, new byte[]{(byte)Script.encodeToOpN(num)}));
@ -102,7 +103,7 @@ public class ScriptBuilder {
checkArgument(threshold <= pubkeys.size()); checkArgument(threshold <= pubkeys.size());
checkArgument(pubkeys.size() <= 16); // That's the max we can represent with a single opcode. checkArgument(pubkeys.size() <= 16); // That's the max we can represent with a single opcode.
ScriptBuilder builder = new ScriptBuilder(); ScriptBuilder builder = new ScriptBuilder();
builder.smallNum((byte)threshold); builder.smallNum((byte) threshold);
for (ECKey key : pubkeys) { for (ECKey key : pubkeys) {
builder.data(key.getPubKey()); builder.data(key.getPubKey());
} }
@ -110,4 +111,15 @@ public class ScriptBuilder {
builder.op(OP_CHECKMULTISIG); builder.op(OP_CHECKMULTISIG);
return builder.build(); return builder.build();
} }
/** Create a program that satisfies an OP_CHECKMULTISIG program. */
public static Script createMultiSigInputScript(List<ECKey.ECDSASignature> signatures,
Transaction.SigHash sigHash, boolean anyoneCanPay) {
checkArgument(signatures.size() <= 16); // Max allowable.
ScriptBuilder builder = new ScriptBuilder();
builder.smallNum(0); // Work around a bug in CHECKMULTISIG that is now a required part of the protocol.
for (ECKey.ECDSASignature signature : signatures)
builder.data(appendByte(signature.encodeToDER(),(byte) ((sigHash.ordinal() + 1) | (anyoneCanPay ? 0x80 : 0))));
return builder.build();
}
} }