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/*

 * @test

 * @bug 6578538

 * @summary com.sun.crypto.provider.SunJCE instance leak using KRB5 and

 *     LoginContext

 * @author Brad Wetmore

 *

 * @run main/othervm -Xmx2m -XX:OldSize=1m -XX:NewSize=512k TestProviderLeak

 *

 * The original test invocation is below, but had to use the above

 * workaround for bug 6923123.

 *

 * run main/othervm -Xmx2m TestProviderLeak

 */

/*

 * We force the leak to become a problem by specifying the minimum

 * size heap we can (above).  In current runs on a server and client

 * machine, it took roughly 220-240 iterations to have the memory leak

 * shut down other operations.  It complained about "Unable to verify

 * the SunJCE provider."

 */

import javax.crypto.*;

import javax.crypto.spec.*;

public class TestProviderLeak {

    private static void dumpMemoryStats(String s) throws Exception {

        Runtime rt = Runtime.getRuntime();

        System.out.println(s + ":\t" +

            rt.freeMemory() + " bytes free");

    }

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

        SecretKeyFactory skf =

            SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1", "SunJCE");

        PBEKeySpec pbeKS = new PBEKeySpec(

            "passPhrase".toCharArray(), new byte [] { 0 }, 5, 512);

        for (int i = 0; i <= 1000; i++) {

            try {

                skf.generateSecret(pbeKS);

                if ((i % 20) == 0) {

                     // Calling gc() isn't dependable, but doesn't hurt.

                     // Gives better output in leak cases.

                    System.gc();

                    dumpMemoryStats("Iteration " + i);

                }

            } catch (Exception e) {

                dumpMemoryStats("\nException seen at iteration " + i);

                throw e;

            }

        }

    }

}