SmallPrimeExponentP.java

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 /*
 * @test
 * @bug 8023546 8151834
 * @modules java.base/sun.security.x509
 *          java.base/sun.security.tools.keytool
 * @summary Test prime exponent (p) lengths 63 and 65 bytes with SunMSCAPI.
 *         The seed 76 has the fastest test execution now (only 5 rounds) and is
 *         hard-coded in run tag. This number might change if algorithms for
 *         RSA key pair generation or BigInteger prime searching gets updated.
 * @requires os.family == "windows"
 * @run main SmallPrimeExponentP 76
 */
import sun.security.tools.keytool.CertAndKeyGen;
import sun.security.x509.X500Name;

import java.security.KeyStore;
import java.security.SecureRandom;
import java.security.cert.X509Certificate;
import java.security.interfaces.RSAPrivateCrtKey;
import java.util.Random;

public class SmallPrimeExponentP {

    public static void main(String argv[]) throws Exception {

        long seed = Long.parseLong(argv[0]);
        System.out.println("Seed for SecureRandom = " + seed + "L");

        KeyStore ks = KeyStore.getInstance("Windows-MY");
        ks.load(null, null);

        CertAndKeyGen ckg = new CertAndKeyGen("RSA", "SHA1withRSA");
        ckg.setRandom(new MySecureRandom(seed));

        boolean see63 = false;
        boolean see65 = false;
        while (!see63 || !see65) {
            ckg.generate(1024);
            RSAPrivateCrtKey k = (RSAPrivateCrtKey) ckg.getPrivateKey();

            int len = k.getPrimeExponentP().toByteArray().length;
            System.out.println("Length of P = " + len);
            if (len == 63 || len == 65) {
                if (len == 63) {
                    if (see63) {
                        continue;
                    } else {
                        see63 = true;
                    }
                }
                if (len == 65) {
                    if (see65) {
                        continue;
                    } else {
                        see65 = true;
                    }
                }
                ks.setKeyEntry("anything", k, null, new X509Certificate[]{
                    ckg.getSelfCertificate(new X500Name("CN=Me"), 1000)
                });
            }
        }
        ks.store(null, null);
    }

    static class MySecureRandom extends SecureRandom {

        final Random random;

        public MySecureRandom(long seed) {
            random = new Random(seed);
        }

        @Override
        public void nextBytes(byte[] bytes) {
            random.nextBytes(bytes);
        }
    }
}