test/jdk/java/security/SecureRandom/DefaultProvider.java

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import static java.lang.System.out;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;

/**
 * @test
 * @bug 8048356
 * @summary Assert default provider used on all OS for SecureRandom
 */
public class DefaultProvider {

    private static final String OS_NAME = System.getProperty("os.name");
    private static final String WINDOWS = "Windows";

    public static void main(String[] args) throws NoSuchAlgorithmException {
        out.println("Operating System: " + OS_NAME);

        /* Test default provider used with constructor */
        out.println("TEST: Default provider with constructor");
        SecureRandom secureRandom = new SecureRandom();
        String provider = secureRandom.getProvider().getName();
        if (!provider.equals(System.getProperty("test.provider.name", "SUN"))) {
            throw new RuntimeException("Unexpected provider name: "
                    + provider);
        }
        out.println("Passed, default provider with constructor: " + provider);

        /* Test default provider with getInstance(String algorithm) */
        out.println("TEST: SHA1PRNG supported on all platforms by SUN provider");
        String algorithm = "SHA1PRNG";
        provider = System.getProperty("test.provider.name", "SUN");

        SecureRandom instance = SecureRandom.getInstance(algorithm);
        assertInstance(instance, algorithm, provider);
        out.println("Passed.");

        if (!OS_NAME.startsWith(WINDOWS)) {
            out.println("TEST: NativePRNG supported on all platforms"
                    + "(except Windows), by SUN provider");
            algorithm = "NativePRNG";
            provider = System.getProperty("test.provider.name", "SUN");
        } else {
            out.println(
                    "TEST: Windows-PRNG supported on windows by SunMSCAPI provider");
            algorithm = "Windows-PRNG";
            provider = "SunMSCAPI";
        }
        instance = SecureRandom.getInstance(algorithm);
        assertInstance(instance, algorithm, provider);
        out.println("Passed.");
    }

    private static void assertInstance(SecureRandom instance,
            String expectedAlgorithm,
            String expectedProvider) {
        if (instance != null) {
            if (!expectedAlgorithm.equalsIgnoreCase(instance.getAlgorithm())) {
                throw new RuntimeException("Expected algorithm:"
                        + expectedAlgorithm + " actual: " + instance.getAlgorithm());
            }

            if (!expectedProvider.equalsIgnoreCase(instance.getProvider().getName())) {
                throw new RuntimeException("Expected provider: "
                        + expectedProvider + " actual: "
                        + instance.getProvider().getName());
            }
        } else {
            throw new RuntimeException("Secure instance is not created");
        }
    }
}