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Merge pull request #149 from matiu/feature/tx-signing-example 

add a tx creation and signing example
This commit is contained in:
Ryan X. Charles 2014-03-13 14:33:23 -04:00
parent 263eef3a3f be0486a427
commit fde7588125
4 changed files with 422 additions and 0 deletions
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210
examples/CreateAndSignTx.js Normal file
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var run = function() {
bitcore = typeof (bitcore) === 'undefined' ? require('../bitcore') : bitcore;
var priv = 'cTgGUrcro89yUtKeG6gHBAS14r3qp25KwTTxG9d4kEzcFxecuZDm';
var amt = '0.005';
var toAddress = 'myuAQcCc1REUgXGsCTiYhZvPPc3XxZ36G1';
var changeAddressString = 'moDz3jEo9q7CxjBDjmb13sL4SKkgo2AACE';
var feeString = '0.0001';
var safeUnspent = [
{
address: "mqSjTad2TKbPcKQ3Jq4kgCkKatyN44UMgZ",
hash: "2ac165fa7a3a2b535d106a0041c7568d03b531e58aeccdd3199d7289ab12cfc1",
vout: 1,
ts: 1394719301,
scriptPubKey: "76a9146ce4e1163eb18939b1440c42844d5f0261c0338288ac",
amount: 0.01,
confirmations: 2
}
]
;
console.log('TX Data: BTC:' + amt + ' => '+ toAddress + ', change To:' + changeAddressString ) ;
console.log('Unspends:', safeUnspent);
var wk = new bitcore.WalletKey({
network: bitcore.networks.testnet
});
wk.fromObj({ priv: priv, });
var wkObj= wk.storeObj();
var keyPairs = [{
key: wkObj.priv,
address: wkObj.addr,
}];
console.log('KEY DB IS:', keyPairs);
var Address = bitcore.Address;
var Transaction = bitcore.Transaction;
var Script = bitcore.Script;
var nets = bitcore.networks;
var z = bitcore.bignum(0);
var amt = bitcore.util.parseValue(amt);
if(z.cmp(amt) === 0 )
throw "spend amount must be greater than zero";
if(!changeAddressString)
throw "change address was not provided";
var fee = bitcore.util.parseValue(feeString || '0');
var total = bitcore.bignum(0).add(amt).add(fee);
var address = new Address(toAddress);
var sendTx = new Transaction();
var i;
var unspent = [];
var unspentAmt = bitcore.bignum(0);
for(i=0;i<safeUnspent.length;i++) {
unspent.push(safeUnspent[i]);
var amountSatoshiString = new bitcore.bignum(safeUnspent[i].amount * Math.pow(10,8)).toString();
unspentAmt = unspentAmt.add(new bitcore.bignum(amountSatoshiString));
// If > -1, we have enough to send the requested amount
if(unspentAmt.cmp(total) > -1) {
break;
}
}
if(unspentAmt.cmp(total) < 0) {
throw "you do not have enough bitcoins to send this amount";
}
var txobj = {};
txobj.version = 1;
txobj.lock_time = 0;
txobj.ins = [];
txobj.outs = [];
for(i=0;i<unspent.length;i++) {
var txin = {};
txin.s = bitcore.util.EMPTY_BUFFER;
txin.q = 0xffffffff;
var hash = new bitcore.Buffer(unspent[i].hash, 'hex');
var hashReversed = bitcore.buffertools.reverse(hash);
var vout = parseInt(unspent[i].vout);
var voutBuf = new bitcore.Buffer(4);
voutBuf.writeUInt32LE(vout, 0);
txin.o = bitcore.Buffer.concat([hashReversed, voutBuf]);
txobj.ins.push(txin);
}
// This is not used really, but we keep it for the future.
var version = address.version();
var script;
if (version == nets.livenet.addressPubkey || version == nets.testnet.addressPubkey)
script = Script.createPubKeyHashOut(address.payload());
else if (version == nets.livenet.addressScript || version == nets.testnet.addressScript)
script = Script.createP2SH(address.payload());
else
throw new Error('invalid output address');
var value = bitcore.util.bigIntToValue(amt);
var txout = {
v: value,
s: script.getBuffer(),
};
txobj.outs.push(txout);
var remainder = unspentAmt.sub(total);
if(z.cmp(amt) !== 0 ) {
var changeAddress = new Address(changeAddressString);
var changeValue = bitcore.util.bigIntToValue(remainder);
// This is not used really, but we keep it for the future.
var cversion = changeAddress.version();
var cscript;
if (cversion == nets.livenet.addressPubkey || cversion == nets.testnet.addressPubkey)
cscript = Script.createPubKeyHashOut(changeAddress.payload());
else if (cversion == nets.livenet.addressScript || cversion == nets.testnet.addressScript)
cscript = Script.createP2SH(changeAddress.payload());
else
throw new Error('invalid change output address');
var change = {
v: changeValue,
s: cscript.getBuffer(),
};
txobj.outs.push(change);
}
var tx = new Transaction(txobj);
var anypay = false;
var l = unspent.length;
var allFound = l;
// Here will be the beginning of your signing for loop
for(i=0;i < l;i++) {
var scriptBuf = new bitcore.Buffer(unspent[i].scriptPubKey, 'hex');
var s = new Script(scriptBuf);
if (s.classify() !== Script.TX_PUBKEYHASH) {
throw new Error('input script type '+ s.getRawOutType() +' not supported yet');
}
var txSigHash = tx.hashForSignature(s, i,
anypay ? Transaction.SIGHASH_ANYONECANPAY : Transaction.SIGHASH_ALL);
// txSigHash = bitcore.buffertools.reverse(txSigHash);
for(var j=0;j<keyPairs.length;j++) {
var kp = keyPairs[j];
if(kp.address === unspent[i].address) {
console.log('SIGNING With...', kp.key); //TODO
console.log('HASH TO SIGN: ',bitcore.buffertools.toHex(txSigHash)); //TODO
var wKey = new bitcore.WalletKey({network: bitcore.networks.testnet});
wKey.fromObj({
priv: kp.key,
});
console.log('PRIV KEY', bitcore.buffertools.toHex(wKey.privKey.private )); //TODO
console.log('PUB KEY', bitcore.buffertools.toHex(wKey.privKey.public )); //TODO
var sigRaw = wKey.privKey.signSync(txSigHash);
console.log('SIGNATURE: ',bitcore.buffertools.toHex(sigRaw)); //TODO
console.log('VERIFY: ',wKey.privKey.verifySignatureSync(txSigHash, sigRaw)); //TODO
var sigType = new bitcore.Buffer(1);
sigType[0] = anypay ? Transaction.SIGHASH_ANYONECANPAY : Transaction.SIGHASH_ALL;
var sig = bitcore.Buffer.concat([sigRaw, sigType]);
var scriptSig = new Script();
scriptSig.chunks.push(sig);
scriptSig.chunks.push(wKey.privKey.public);
scriptSig.updateBuffer();
tx.ins[i].s = scriptSig.getBuffer();
allFound--;
break;
}
}
}
if (allFound !== 0) {
throw new Error('could not find priv key for some inputs');
}
var txHex = tx.serialize().toString('hex');
console.log('TX HEX IS: ', txHex);
};
module.exports.run = run;
if (require.main === module) {
run();
}
////

205
examples/createTx.js Normal file
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var bitcore = require('../bitcore');
var priv = 'cTgGUrcro89yUtKeG6gHBAS14r3qp25KwTTxG9d4kEzcFxecuZDm';
var amt = '0.005';
var toAddress = 'myuAQcCc1REUgXGsCTiYhZvPPc3XxZ36G1';
var changeAddressString = 'moDz3jEo9q7CxjBDjmb13sL4SKkgo2AACE';
var feeString = '0.0001';
var safeUnspent = [
{
address: "mqSjTad2TKbPcKQ3Jq4kgCkKatyN44UMgZ",
hash: "2ac165fa7a3a2b535d106a0041c7568d03b531e58aeccdd3199d7289ab12cfc1",
vout: 1,
ts: 1394719301,
scriptPubKey: "76a9146ce4e1163eb18939b1440c42844d5f0261c0338288ac",
amount: 0.01,
confirmations: 2
}
]
;
console.log('TX Data: BTC:' + amt + ' => '+ toAddress + ', change To:' + changeAddressString ) ;
console.log('Unspends:', safeUnspent);
var wk = new bitcore.WalletKey({
network: bitcore.networks.testnet
});
wk.fromObj({ priv: priv, });
var wkObj= wk.storeObj();
var keyPairs = [{
key: wkObj.priv,
address: wkObj.addr,
}];
console.log('KEY DB IS:', keyPairs);
var Address = bitcore.Address;
var Transaction = bitcore.Transaction;
var Script = bitcore.Script;
var nets = bitcore.networks;
var z = bitcore.bignum(0);
var amt = bitcore.util.parseValue(amt);
if(z.cmp(amt) === 0 )
throw "spend amount must be greater than zero";
if(!changeAddressString)
throw "change address was not provided";
var fee = bitcore.util.parseValue(feeString || '0');
var total = bitcore.bignum(0).add(amt).add(fee);
var address = new Address(toAddress);
var sendTx = new Transaction();
var i;
var unspent = [];
var unspentAmt = bitcore.bignum(0);
for(i=0;i<safeUnspent.length;i++) {
unspent.push(safeUnspent[i]);
var amountSatoshiString = new bitcore.bignum(safeUnspent[i].amount * Math.pow(10,8)).toString();
unspentAmt = unspentAmt.add(new bitcore.bignum(amountSatoshiString));
// If > -1, we have enough to send the requested amount
if(unspentAmt.cmp(total) > -1) {
break;
}
}
if(unspentAmt.cmp(total) < 0) {
throw "you do not have enough bitcoins to send this amount";
}
var txobj = {};
txobj.version = 1;
txobj.lock_time = 0;
txobj.ins = [];
txobj.outs = [];
for(i=0;i<unspent.length;i++) {
var txin = {};
txin.s = bitcore.util.EMPTY_BUFFER;
txin.q = 0xffffffff;
var hash = new bitcore.Buffer(unspent[i].hash, 'hex');
var hashReversed = bitcore.buffertools.reverse(hash);
var vout = parseInt(unspent[i].vout);
var voutBuf = new bitcore.Buffer(4);
voutBuf.writeUInt32LE(vout, 0);
txin.o = bitcore.Buffer.concat([hashReversed, voutBuf]);
txobj.ins.push(txin);
}
// This is not used really, but we keep it for the future.
var version = address.version();
var script;
if (version == nets.livenet.addressPubkey || version == nets.testnet.addressPubkey)
script = Script.createPubKeyHashOut(address.payload());
else if (version == nets.livenet.addressScript || version == nets.testnet.addressScript)
script = Script.createP2SH(address.payload());
else
throw new Error('invalid output address');
var value = bitcore.util.bigIntToValue(amt);
var txout = {
v: value,
s: script.getBuffer(),
};
txobj.outs.push(txout);
var remainder = unspentAmt.sub(total);
if(z.cmp(amt) !== 0 ) {
var changeAddress = new Address(changeAddressString);
var changeValue = bitcore.util.bigIntToValue(remainder);
// This is not used really, but we keep it for the future.
var cversion = changeAddress.version();
var cscript;
if (cversion == nets.livenet.addressPubkey || cversion == nets.testnet.addressPubkey)
cscript = Script.createPubKeyHashOut(changeAddress.payload());
else if (cversion == nets.livenet.addressScript || cversion == nets.testnet.addressScript)
cscript = Script.createP2SH(changeAddress.payload());
else
throw new Error('invalid change output address');
var change = {
v: changeValue,
s: cscript.getBuffer(),
};
txobj.outs.push(change);
}
var tx = new Transaction(txobj);
var anypay = false;
var l = unspent.length;
var allFound = l;
// Here will be the beginning of your signing for loop
for(i=0;i < l;i++) {
var scriptBuf = new bitcore.Buffer(unspent[i].scriptPubKey, 'hex');
var s = new Script(scriptBuf);
if (s.classify() !== Script.TX_PUBKEYHASH) {
throw new Error('input script type '+ s.getRawOutType() +' not supported yet');
}
var txSigHash = tx.hashForSignature(s, i,
anypay ? Transaction.SIGHASH_ANYONECANPAY : Transaction.SIGHASH_ALL);
// txSigHash = bitcore.buffertools.reverse(txSigHash);
for(var j=0;j<keyPairs.length;j++) {
var kp = keyPairs[j];
if(kp.address === unspent[i].address) {
console.log('[wallet.js.409:address:] SIGNING With...', kp.key); //TODO
console.log('[kk.js.168:txSigHash:] HASH TO SIGN: ',bitcore.buffertools.toHex(txSigHash)); //TODO
var wKey = new bitcore.WalletKey({network: bitcore.networks.testnet});
wKey.fromObj({
priv: kp.key,
});
console.log('[kk2.js.169] PRIV KEY', bitcore.buffertools.toHex(wKey.privKey.private )); //TODO
console.log('[kk2.js.169] PUB KEY', bitcore.buffertools.toHex(wKey.privKey.public )); //TODO
var sigRaw = wKey.privKey.signSync(txSigHash);
console.log('[kk.js.168:txSigHash:] SIGNATURE: ',bitcore.buffertools.toHex(sigRaw)); //TODO
//VERIFY
console.log('[kk.js.168:txSigHash:] VERIFY: ',wKey.privKey.verifySignatureSync(txSigHash, sigRaw)); //TODO
var sigType = new bitcore.Buffer(1);
sigType[0] = anypay ? Transaction.SIGHASH_ANYONECANPAY : Transaction.SIGHASH_ALL;
var sig = bitcore.Buffer.concat([sigRaw, sigType]);
var scriptSig = new Script();
scriptSig.chunks.push(sig);
scriptSig.chunks.push(wKey.privKey.public);
scriptSig.updateBuffer();
tx.ins[i].s = scriptSig.getBuffer();
allFound--;
break;
}
}
}
if (allFound !== 0) {
throw new Error('could not find priv key for some inputs');
}
var txHex = tx.serialize().toString('hex');
console.log('[kk.js.188:ret:] OUT IS: ', txHex);
////

6
examples/example.html
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@ -90,6 +90,12 @@
print("Private: " + o.priv);
print("Public: " + o.pub);
print("Addr: " + o.addr);
var module = { exports: {} };
</script>
<script src="./CreateAndSignTx.js"></script>
<script>
run();
</script>
</body>
</html>

1
test/test.examples.js
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@ -10,6 +10,7 @@ var examples = [
'PeerManager',
'Rpc',
'SendTx',
'CreateAndSignTx',
'Script',
];