Eth draft support

index.js

@@ -1 +1,192 @@
-module.exports = require('bindings')('cryptoforknote.node')
+module.exports = require('bindings')('cryptoforknote.node');
+
+const SHA3    = require('sha3');
+const bignum  = require('bignum');
+const bitcoin = require('bitcoinjs-lib');
+const varuint = require('varuint-bitcoin');
+const crypto  = require('crypto');
+const fastMerkleRoot = require('merkle-lib/fastRoot');
+
+function scriptCompile(addrHash) {
+  return bitcoin.script.compile([
+    bitcoin.opcodes.OP_DUP,
+    bitcoin.opcodes.OP_HASH160,
+    addrHash,
+    bitcoin.opcodes.OP_EQUALVERIFY,
+    bitcoin.opcodes.OP_CHECKSIG
+  ]);
+}
+
+function reverseBuffer(buff) {
+  let reversed = new Buffer(buff.length);
+  for (var i = buff.length - 1; i >= 0; i--) reversed[buff.length - i - 1] = buff[i];
+  return reversed;
+}
+
+function txesHaveWitnessCommit(transactions) {
+  return (
+    transactions instanceof Array &&
+    transactions[0] &&
+    transactions[0].ins &&
+    transactions[0].ins instanceof Array &&
+    transactions[0].ins[0] &&
+    transactions[0].ins[0].witness &&
+    transactions[0].ins[0].witness instanceof Array &&
+    transactions[0].ins[0].witness.length > 0
+  );
+}
+
+function sha256(buffer) {
+  return crypto.createHash('sha256').update(buffer).digest();
+};
+
+function hash256(buffer) {
+  return sha256(sha256(buffer));
+};
+
+function getMerkleRoot(transactions) {
+  if (transactions.length === 0) return new Buffer('0000000000000000000000000000000000000000000000000000000000000000', 'hex')
+  const forWitness = txesHaveWitnessCommit(transactions);
+  const hashes = transactions.map(transaction => transaction.getHash(forWitness));
+  const rootHash = fastMerkleRoot(hashes, hash256);
+  return forWitness ? hash256(Buffer.concat([rootHash, transactions[0].ins[0].witness[0]])) : rootHash;
+}
+
+let last_epoch_number;
+let last_seed_hash;
+
+module.exports.baseDiff = function() {
+  return bignum('FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF', 16);
+};
+
+module.exports.baseRavenDiff = function() {
+  return parseInt('0x00000000ff000000000000000000000000000000000000000000000000000000');
+};
+
+module.exports.RavenBlockTemplate = function(rpcData, poolAddress) {
+  const poolAddrHash = bitcoin.address.fromBase58Check(poolAddress).hash;
+
+  let txCoinbase = new bitcoin.Transaction();
+  let bytesHeight;
+  { // input for coinbase tx
+    let blockHeightSerial = rpcData.height.toString(16).length % 2 === 0 ?
+                                  rpcData.height.toString(16) :
+                            '0' + rpcData.height.toString(16);
+    bytesHeight = Math.ceil((rpcData.height << 1).toString(2).length / 8);
+    const lengthDiff  = blockHeightSerial.length/2 - bytesHeight;
+    for (let i = 0; i < lengthDiff; i++) blockHeightSerial = blockHeightSerial + '00';
+    const serializedBlockHeight = new Buffer.concat([
+      new Buffer('0' + bytesHeight, 'hex'),
+      reverseBuffer(new Buffer(blockHeightSerial, 'hex')),
+      new Buffer('00', 'hex') // OP_0
+    ]);
+
+    txCoinbase.addInput(
+      // will be used for our reserved_offset extra_nonce
+      new Buffer('0000000000000000000000000000000000000000000000000000000000000000', 'hex'),
+      0xFFFFFFFF, 0xFFFFFFFF,
+      new Buffer.concat([serializedBlockHeight, Buffer('CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC', 'hex')]) // 17 bytes
+    );
+
+    txCoinbase.addOutput(scriptCompile(poolAddrHash), Math.floor(rpcData.coinbasevalue));
+
+    if (rpcData.default_witness_commitment) {
+      txCoinbase.addOutput(new Buffer(rpcData.default_witness_commitment, 'hex'), 0);
+    }
+  }
+
+  let header = new Buffer(80);
+  { let position = 0;
+    header.writeUInt32BE(rpcData.height, position, 4);                  // height         42-46
+    header.write(rpcData.bits, position += 4, 4, 'hex');                // bits           47-50
+    header.writeUInt32BE(rpcData.curtime, position += 4, 4, 'hex');     // nTime          51-54
+    header.write('DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD', position += 4, 32, 'hex');                 // merkelRoot     55-87
+    header.write(rpcData.previousblockhash, position += 32, 32, 'hex'); // prevblockhash  88-120
+    header.writeUInt32BE(rpcData.version, position += 32, 4);           // version        121-153
+    header = reverseBuffer(header);
+  }
+  
+  let blob = new Buffer.concat([
+    header, // 80 bytes
+    new Buffer('AAAAAAAAAAAAAAAA', 'hex'), // 8 bytes
+    new Buffer('BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB', 'hex'), // 32 bytes
+    varuint.encode(rpcData.transactions.length + 1, new Buffer(varuint.encodingLength(rpcData.transactions.length + 1)), 0)
+  ]);
+  const offset1 = blob.length; 
+  blob = new Buffer.concat([ blob, new Buffer(txCoinbase.toHex(), 'hex') ]);
+
+  rpcData.transactions.forEach(function (value) {
+    blob = new Buffer.concat([ blob, new Buffer(value.data, 'hex') ]);
+  });
+
+  const EPOCH_LENGTH = 7500;
+  const epoch_number = Math.floor(rpcData.height / EPOCH_LENGTH);
+  if (last_epoch_number !== epoch_number) {
+    let sha3 = new SHA3.SHA3Hash(256);
+    if (last_epoch_number && last_epoch_number + 1 === epoch_number) {
+      last_seed_hash = sha3.update(last_seed_hash).digest();
+    } else {
+      last_seed_hash = new Buffer(32, 0);
+      for (let i = 0; i < epoch_number; i++) {
+        last_seed_hash = sha3.update(last_seed_hash).digest();
+        sha3.reset();
+      }
+    }
+    last_epoch_number = epoch_number;
+  }
+
+  const difficulty = parseFloat((module.exports.baseRavenDiff() / bignum(rpcData.target, 16).toNumber()).toFixed(9));
+
+  return {
+    blocktemplate_blob: blob.toString('hex'),
+    // reserved_offset to CCCCCC....
+    reserved_offset:    offset1 + 4 /* txCoinbase.version */ + 1 /* vinLen */  + 32 /* hash */ + 4 /* index  */ +
+                        1 /* vScript len */ + 1 /* coinbase height len */ + bytesHeight + 1 /* trailing zero byte */,
+    seed_hash:          last_seed_hash.toString('hex'),
+    difficulty:         difficulty,
+    height:             rpcData.height,
+    bits:               rpcData.bits,
+    prev_hash:          rpcData.previousblockhash,
+  };
+};
+
+function update_merkle_root_hash(blob_in, blob_out) {
+  let offset = 80 + 8 + 32;
+  const nTransactions = varuint.decode(blob_in, offset);
+  offset += varuint.decode.bytes;
+  let transactions = [];
+  for (let i = 0; i < nTransactions; ++i) {
+    const tx = bitcoin.Transaction.fromBuffer(blob_in.slice(offset), true);
+    transactions.push(tx);
+    offset += tx.byteLength();
+  }
+  getMerkleRoot(transactions).copy(blob_out, 4 + 32);
+};
+
+module.exports.convertRavenBlob = function(blobBuffer) {
+  let header = blobBuffer.slice(0, 80);
+  update_merkle_root_hash(blobBuffer, header);
+  return reverseBuffer(hash256(header));
+};
+
+module.exports.constructNewRavenBlob = function(blockTemplate, nonceBuff, mixhashBuff) {
+  update_merkle_root_hash(blockTemplate, blockTemplate);
+  nonceBuff.copy  (blockTemplate, 80, 0, 8);
+  mixhashBuff.copy(blockTemplate, 88, 0, 32);
+  return blockTemplate;
+};
+
+module.exports.constructNewDeroBlob = function(blockTemplate, nonceBuff) {
+  nonceBuff.copy(blockTemplate, 39, 0, 4);
+  return blockTemplate;
+};
+
+module.exports.EthBlockTemplate = function(rpcData) {
+  const difficulty = module.exports.baseDiff().div(bignum(rpcData[2].substr(2), 16)).toNumber();
+  return {
+    hash:               rpcData[0].substr(2),
+    seed_hash:          rpcData[1].substr(2),
+    difficulty:         difficulty,
+    height:             parseInt(rpcData[3])
+  };
+};

package.json

@@ -1,6 +1,6 @@
 {
   "name": "cryptoforknote-util",
-  "version": "8.2.0",
+  "version": "9.1.4",
   "main": "cryptoforknote-util",
   "author": {
     "name": "LucasJones",
@@ -11,8 +11,13 @@
     "url": "https://github.com/MoneroOcean/node-cryptoforknote-util.git"
   },
   "dependencies": {
+    "promise":  "*",
     "bindings": "*",
-    "nan": "^2.0.0"
+    "nan":      "^2.0.0",
+    "bignum":   "^0.13.1",
+    "sha3":     "*",
+    "varuint-bitcoin": "^1.0.4",
+    "bitcoinjs-lib":   "git+https://github.com/bitcoinjs/bitcoinjs-lib.git#533d6c2e6d0aa4111f7948b1c12003cf6ef83137"
   },
   "keywords": [
     "cryptonight",