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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5 to JDK 1.8.
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package org.bouncycastle.pqc.math.linearalgebra;
import java.security.SecureRandom;
public class RandUtils
{
static int nextInt(SecureRandom rand, int n)
{
if ((n & -n) == n) // i.e., n is a power of 2
{
return (int)((n * (long)(rand.nextInt() >>> 1)) >> 31);
}
int bits, value;
do
{
bits = rand.nextInt() >>> 1;
value = bits % n;
}
while (bits - value + (n - 1) < 0);
return value;
}
}