Convert to hex

to_hex.dart

import 'dart:convert';
import 'dart:typed_data';

void main() {
  String input = "";
  Uint8List hexDecoded = hexToBytes(input);
  Uint8List base64Decoded = base64Decode(hexDecoded);
  String hexEncoded = bytesToHex(base64Decoded);
  print(hexEncoded);
}

Uint8List hexToBytes(String hex) {
  var result = Uint8List(hex.length ~/ 2);
  for (var i = 0; i < hex.length; i += 2) {
    var byte = hex.substring(i, i + 2);
    result[i ~/ 2] = int.parse(byte, radix: 16);
  }
  return result;
}

Uint8List base64Decode(Uint8List hexBytes) {
  var base64Str = utf8.decode(hexBytes);
  return base64.decode(base64Str);
}

String bytesToHex(Uint8List bytes) {
  return bytes.map((byte) => byte.toRadixString(16).padLeft(2, '0')).join('');
}