buildElement1 function

BigInt buildElement1(Map<String, dynamic> tx)

Build element_1 for L2HashSignature @param {Object} tx - Transaction object returned by encodeTransaction @returns {BigInt} element_1 L2 signature

Implementation

BigInt buildElement1(Map<String, dynamic> tx) {
  BigInt res = BigInt.zero;

  final toEthereumAddress = BigInt.parse(
      tx['toEthereumAddress'] != null
          ? tx['toEthereumAddress'].substring(2)
          : '0',
      radix: 16);
  double amount = tx['amount'] != null ? double.parse(tx['amount']) : 0;
  final amountF = BigInt.from(
          HermezCompressedAmount.compressAmount(amount).value.toInt()) <<
      160;
  final maxNumBatch =
      BigInt.from(tx['maxNumBatch'] != null ? tx['maxNumBatch'] : 0) << 200;

  res = res + toEthereumAddress; // ethAddr --> 160 bits
  res = res + amountF; // amountF --> 40 bits
  res = res + maxNumBatch; // maxNumBatch --> 32 bits

  return res;
}