if (N < 2 || (N & (N - 1)) != 0) {
throw new IllegalArgumentException("N must be a power of 2 greater than 1");
}
+ if (r <= 0) {
+ throw new IllegalArgumentException("Parameter r zero or negative");
+ }
+ if (p <= 0) {
+ throw new IllegalArgumentException("Parameter p zero or negative");
+ }
if (N > MAX_VALUE / 128 / r) {
throw new IllegalArgumentException("Parameter N is too large");