How can I instantiate a predictable and secure random number generator which will generate consistent random numbers across Java versions and operating systems?
The following code used to work in Java 8 but no longer works in Java 10:
import java.security.SecureRandom;
public class PredictableRandom {
public static void main(String[] args) {
PredictableRandom predictableRandom = new PredictableRandom();
predictableRandom.execute();
}
private void execute() {
SecureRandom secureRandom = new SecureRandom();
System.out.println(secureRandom.getAlgorithm());
System.out.println(secureRandom.getProvider());
long seed = 12345678L;
secureRandom.setSeed(seed);
System.out.println(secureRandom.nextLong());
SecureRandom secureRandom2 = new SecureRandom();
secureRandom2.setSeed(seed);
System.out.println(secureRandom2.nextLong());
}
}
In Java 8 - good, different random objects generate the same random number:
SHA1PRNG
SUN version 1.8
3325995872096263519
3325995872096263519
In Java 10 - bad, different random objects generate different random number:
DRBG
SUN version 10
-3526685326322256981
-2373261409119309182
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