code: public String decodeHex(String hash){
        String result = "";
        long[] numbers = this.decrypt(hash);
  
  	  for (long number : numbers) {
  		  result += Long.toHexString(number).substring(1);
  	  }
  
        return result;
    }
docs: Decrypt string to numbers
  
  @param hash the encrypt string
  @return decryped numbers