docs: public static BIG hashModOrder(byte[] data) {
          HASH256 hash = new HASH256();
          for (byte b : data) {
              hash.process(b);
          }
  
          byte[] hasheddata = hash.hash();
  
          BIG ret = BIG.fromBytes(hasheddata);
          ret.mod(IdemixUtils.GROUP_ORDER);
  
          return ret;
      }