136 lines
4.9 KiB
JavaScript
136 lines
4.9 KiB
JavaScript
module.exports = require('bindings')('cryptoforknote.node');
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const SHA3 = require('sha3');
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const bignum = require('bignum');
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const bitcoin = require('bitcoinjs-lib');
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const promise = require('promise');
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const merklebitcoin = promise.denodeify(require('merkle-bitcoin'));
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function scriptCompile(addrHash) {
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return bitcoin.script.compile([
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bitcoin.opcodes.OP_DUP,
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bitcoin.opcodes.OP_HASH160,
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addrHash,
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bitcoin.opcodes.OP_EQUALVERIFY,
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bitcoin.opcodes.OP_CHECKSIG
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]);
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}
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function reverseBuffer(buff) {
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let reversed = new Buffer(buff.length);
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for (var i = buff.length - 1; i >= 0; i--) reversed[buff.length - i - 1] = buff[i];
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return reversed;
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}
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function getMerkleRoot(rpcData, generateTxRaw) {
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hashes = [ reverseBuffer(new Buffer(generateTxRaw, 'hex')).toString('hex') ];
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rpcData.transactions.forEach(function (value) {
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if (value.txid !== undefined) {
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hashes.push(value.txid);
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} else {
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hashes.push(value.hash);
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}
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});
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if (hashes.length === 1) return hashes[0];
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return Object.values(merklebitcoin(hashes))[2].root;
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};
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function varIntBuffer(n) {
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if (n < 0xfd) {
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return new Buffer([n]);
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} else if (n <= 0xffff) {
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let buff = new Buffer(3);
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buff[0] = 0xfd;
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buff.writeUInt16LE(n, 1);
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return buff;
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} else if (n <= 0xffffffff) {
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let buff = new Buffer(5);
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buff[0] = 0xfe;
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buff.writeUInt32LE(n, 1);
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return buff;
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} else {
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let buff = new Buffer(9);
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buff[0] = 0xff;
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buff.writeUInt64LE(n, 1);
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return buff;
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}
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};
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module.exports.RavenBlockTemplate = function(rpcData, poolAddress) {
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// epoch length
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const EPOCH_LENGTH = 7500;
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const poolAddrHash = bitcoin.address.fromBase58Check(poolAddress).hash;
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let txCoinbase = new bitcoin.Transaction();
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{ // input for coinbase tx
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let blockHeightSerial = rpcData.height.toString(16).length % 2 === 0 ?
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rpcData.height.toString(16) :
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'0' + rpcData.height.toString(16);
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const bytesHeight = Math.ceil((rpcData.height << 1).toString(2).length / 8);
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const lengthDiff = blockHeightSerial.length/2 - bytesHeight;
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for (let i = 0; i < lengthDiff; i++) blockHeightSerial = blockHeightSerial + '00';
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const serializedBlockHeight = new Buffer.concat([
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new Buffer('0' + bytesHeight, 'hex'),
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reverseBuffer(new Buffer(blockHeightSerial, 'hex')),
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new Buffer('00', 'hex') // OP_0
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]);
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txCoinbase.addInput(
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new Buffer('0000000000000000000000000000000000000000000000000000000000000000', 'hex'),
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0xFFFFFFFF, 0xFFFFFFFF,
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new Buffer.concat([serializedBlockHeight, Buffer('6b6177706f77', 'hex')])
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);
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txCoinbase.addOutput(scriptCompile(poolAddrHash), Math.floor(rpcData.coinbasevalue));
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if (rpcData.default_witness_commitment !== undefined) {
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txCoinbase.addOutput(new Buffer(rpcData.default_witness_commitment, 'hex'), 0);
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}
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}
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const merkleRoot = getMerkleRoot(rpcData, txCoinbase.getHash().toString('hex'));
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let header = new Buffer(80);
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{ let position = 0;
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header.writeUInt32BE(rpcData.height, position, 4); // height 42-46
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header.write(rpcData.bits, position += 4, 4, 'hex'); // bits 47-50
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header.writeUInt32BE(rpcData.curtime, position += 4, 4, 'hex'); // nTime 51-54
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header.write(merkleRoot, position += 4, 32, 'hex'); // merkelRoot 55-87
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header.write(rpcData.previousblockhash, position += 32, 32, 'hex'); // prevblockhash 88-120
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header.writeUInt32BE(rpcData.version, position += 32, 4); // version 121-153
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header = reverseBuffer(header);
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}
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let blob = new Buffer.concat([
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header, // 80 bytes
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new Buffer('EEEEEEEEEEEEEEEE', 'hex'), // 8 bytes
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new Buffer('EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE', 'hex'), // 32 bytes
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varIntBuffer(rpcData.transactions.length + 1)
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]);
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const offset1 = blob.length;
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blob = new Buffer.concat([ blob, new Buffer(txCoinbase.toHex(), 'hex') ]);
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rpcData.transactions.forEach(function (value) {
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blob = new Buffer.concat([ blob, new Buffer(value.data, 'hex') ]);
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});
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let sha3 = new SHA3.SHA3Hash(256);
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let seedhash_buf = new Buffer(32, 0);
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const epoch_number = Math.floor(rpcData.height / EPOCH_LENGTH);
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for (let i=0; i < epoch_number; i++) {
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seedhash_buf = sha3.update(seedhash_buf).digest();
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sha3.reset();
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}
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const seed_hash = seedhash_buf.toString('hex');
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const diff1 = 0x00000000ff000000000000000000000000000000000000000000000000000000;
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const difficulty = parseFloat((diff1 / bignum(rpcData.target, 16).toNumber()).toFixed(9));
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return {
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blocktemplate_blob: blob,
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reserved_offset: offset1 + 4 /* txCoinbase.version */ + 1 /* txCoinbase.marker */ + 1 /* txCoinbase.flag */ + 1 /* txCoinbase.vinLen */,
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seed_hash: seed_hash,
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difficulty: difficulty,
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height: rpcData.height,
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rpc: rpcData,
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};
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};
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