129 lines
3.9 KiB
JavaScript
129 lines
3.9 KiB
JavaScript
function signOne(hash, addrStr, keys) {
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var keyObj = keys[addrStr];
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var rawPrivKey = new Buffer(keyObj.priv, 'hex');
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var key = new KeyModule.Key();
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key.private = rawPrivKey;
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var signature = key.signSync(hash);
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return signature;
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}
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function signTxIn(nIn, tx, txInputs, network, keys, scripts) {
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// locate TX input needing a signature
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var txin = tx.ins[nIn];
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var scriptSig = txin.getScript();
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// locate TX output, within txInputs
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var txoutHash = txin.getOutpointHash();
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if (!(txoutHash in txInputs))
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throw new Error("signTxIn missing input hash");
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var txFrom = txInputs[txoutHash];
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var txoutIndex = txin.getOutpointIndex();
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if (txFrom.outs.length >= txoutIndex)
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throw new Error("signTxIn missing input index");
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var txout = txFrom.outs[txoutIndex];
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var scriptPubKey = txout.getScript();
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// detect type of transaction, and extract useful elements
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var txType = scriptPubKey.classify();
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if (txType == TX_UNKNOWN)
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throw new Error("unknown TX type");
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var scriptData = scriptPubKey.capture();
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// if P2SH, lookup the script
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var subscriptRaw = undefined;
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var subscript = undefined;
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var subType = undefined;
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var subData = undefined;
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if (txType == TX_SCRIPTHASH) {
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var addr = new Address(network.P2SHVersion, scriptData[0]);
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var addrStr = addr.toString();
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if (!(addrStr in scripts))
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throw new Error("unknown script hash address");
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subscriptRaw = new Buffer(scripts[addrStr], 'hex');
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subscript = new Script(subscriptRaw);
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subType = subscript.classify();
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if (subType == TX_UNKNOWN)
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throw new Error("unknown subscript TX type");
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subData = subscript.capture();
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}
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var hash = tx.hashForSignature(scriptPubKey, i, 0);
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switch (txType) {
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case TX_PUBKEY:
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// already signed
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if (scriptSig.chunks.length > 0)
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return;
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var pubkeyhash = util.sha256ripe160(scriptData[0]);
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var addr = new Address(network.addressVersion, pubkeyhash);
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var addrStr = addr.toString();
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if (!(addrStr in keys))
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throw new Error("unknown pubkey");
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var signature = signOne(hash, addrStr, keys);
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scriptSig.writeBytes(signature);
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break;
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case TX_PUBKEYHASH:
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// already signed
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if (scriptSig.chunks.length > 0)
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return;
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var addr = new Address(network.addressVersion, scriptData[0]);
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var addrStr = addr.toString();
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if (!(addrStr in keys))
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throw new Error("unknown pubkey hash address");
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var signature = signOne(hash, addrStr, keys);
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scriptSig.writeBytes(signature);
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scriptSig.writeBytes(key.public);
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break;
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case TX_SCRIPTHASH:
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// already signed
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if (scriptSig.chunks.length > 0)
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return;
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var addr = new Address(network.addressVersion, subData[0]);
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var addrStr = addr.toString();
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if (!(addrStr in keys))
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throw new Error("unknown script(pubkey hash) address");
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var signature = signOne(hash, addrStr, keys);
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scriptSig.writeBytes(signature);
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scriptSig.writeBytes(key.public);
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break;
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case TX_MULTISIG:
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while (scriptSig.chunks.length < scriptData.length) {
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scriptSig.writeBytes(util.EMPTY_BUFFER);
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}
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for (var i = 0; i < scriptData.length; i++) {
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// skip already signed
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if (scriptSig.chunks[i].length > 0)
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continue;
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var pubkeyhash = util.sha256ripe160(scriptSig.chunks[i]);
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var addr = new Address(network.addressVersion, pubkeyhash);
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var addrStr = addr.toString();
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if (!(addrStr in keys))
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continue;
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var signature = signOne(hash, addrStr, keys);
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scriptSig.chunks[i] = signature;
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}
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break;
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}
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if (txtype == TX_SCRIPTHASH)
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scriptSig.writeBytes(subscriptRaw);
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}
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exports.Transaction = function Transaction(tx, txInputs, network, keys, scripts) {
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for (var i = 0; i < tx.ins.length; i++)
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signTxIn(i, tx, txInputs, network, keys, scripts);
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};
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