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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;
}
}
}
}