test/jdk/sun/security/tools/keytool/Serial64.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 */

/*
 * @test
 * @bug 8221257 8222275
 * @summary Improve serial number generation mechanism for keytool -gencert
 * @library /test/lib
 * @key randomness
 */

import jdk.test.lib.SecurityTools;

import java.io.File;
import java.io.FileInputStream;
import java.math.BigInteger;
import java.security.KeyStore;
import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;

public class Serial64 {

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

        boolean see64 = false;

        see64 |= see64(genkeypair("ca"));
        see64 |= see64(genkeypair("user"));

        keytool("-certreq -alias user -file req");

        for (int i = 3; i <= 30; i++) {
            see64 |= see64(gencert());
            if (i >= 10 && see64) {
                // As long as we have generated >=10 (non-negative) SNs and
                // at least one is 64 bit it's good to go.
                return;
            }
        }

        // None is 64 bit. There is a chance of 2^-30 we reach here.
        // Or, maybe we do have a bug?
        throw new RuntimeException("No 64-bit serial number");
    }

    static boolean see64(BigInteger sn) {
        System.out.println(sn.toString(16));

        if (sn.signum() != 1) {
            throw new RuntimeException("Must be positive");
        }
        return sn.bitLength() == 64;
    }

    static void keytool(String s) throws Exception {
        SecurityTools.keytool("-storepass changeit -keypass changeit "
                + "-keystore ks -keyalg rsa " + s)
                .shouldHaveExitValue(0);
    }

    static BigInteger genkeypair(String a) throws Exception {
        keytool("-genkeypair -alias " + a + " -dname CN=" + a);
        return ((X509Certificate)KeyStore.getInstance(
                new File("ks"), "changeit".toCharArray())
                    .getCertificate(a)).getSerialNumber();
    }

    static BigInteger gencert() throws Exception {
        keytool("-gencert -alias ca -infile req -outfile cert");
        try (FileInputStream fis = new FileInputStream("cert")) {
            return ((X509Certificate)CertificateFactory.getInstance("X.509")
                    .generateCertificate(fis)).getSerialNumber();
        }
    }
}