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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 and up.

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package org.bouncycastle.crypto.test;

import java.math.BigInteger;

import org.bouncycastle.util.BigIntegers;
import org.bouncycastle.util.test.SimpleTest;
import org.bouncycastle.util.test.TestRandomData;

public class BigIntegersTest
    extends SimpleTest
{
    public String getName()
    {
        return "BigIntegers";
    }

    public void performTest()
        throws Exception
    {
        BigInteger min = BigInteger.valueOf(5);
        isTrue(min.equals(BigIntegers.createRandomPrime(min.bitLength(), 1,
            new TestRandomData(BigIntegers.asUnsignedByteArray(min)))));

        BigInteger max = BigInteger.valueOf(743);
        isTrue(max.equals(BigIntegers.createRandomPrime(max.bitLength(), 1,
            new TestRandomData(BigIntegers.asUnsignedByteArray(max)))));
    }

    public static void main(String[] args)
        throws Exception
    {
        runTest(new BigIntegersTest());
    }
}