class Utils {
/**
*
* @param first
* @param second
* @return -1 on success, -2 if length differs, otherwise the index that failed
*/
public static int compareArrays(byte[] first, byte[] second) {
if(first.length != second.length) return -2;
for (int i = 0; i < first.length; i++) {
if(first[i] != second[i])
return i;
}
return -1;
}
}