org.apache.hadoop.crypto.random.TestOsSecureRandom.java Source code

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Here is the source code for org.apache.hadoop.crypto.random.TestOsSecureRandom.java

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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.hadoop.crypto.random;

import java.io.IOException;
import java.util.Arrays;

import org.apache.commons.lang.SystemUtils;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.util.Shell.ShellCommandExecutor;
import org.junit.Assume;
import org.junit.Test;

public class TestOsSecureRandom {

    private static OsSecureRandom getOsSecureRandom() throws IOException {
        Assume.assumeTrue(SystemUtils.IS_OS_LINUX);
        OsSecureRandom random = new OsSecureRandom();
        random.setConf(new Configuration());
        return random;
    }

    @Test(timeout = 120000)
    public void testRandomBytes() throws Exception {
        OsSecureRandom random = getOsSecureRandom();
        // len = 16
        checkRandomBytes(random, 16);
        // len = 32
        checkRandomBytes(random, 32);
        // len = 128
        checkRandomBytes(random, 128);
        // len = 256
        checkRandomBytes(random, 256);
        random.close();
    }

    /**
     * Test will timeout if secure random implementation always returns a 
     * constant value.
     */
    private void checkRandomBytes(OsSecureRandom random, int len) {
        byte[] bytes = new byte[len];
        byte[] bytes1 = new byte[len];
        random.nextBytes(bytes);
        random.nextBytes(bytes1);

        while (Arrays.equals(bytes, bytes1)) {
            random.nextBytes(bytes1);
        }
    }

    /**
     * Test will timeout if secure random implementation always returns a 
     * constant value.
     */
    @Test(timeout = 120000)
    public void testRandomInt() throws Exception {
        OsSecureRandom random = getOsSecureRandom();

        int rand1 = random.nextInt();
        int rand2 = random.nextInt();
        while (rand1 == rand2) {
            rand2 = random.nextInt();
        }
        random.close();
    }

    /**
     * Test will timeout if secure random implementation always returns a 
     * constant value.
     */
    @Test(timeout = 120000)
    public void testRandomLong() throws Exception {
        OsSecureRandom random = getOsSecureRandom();

        long rand1 = random.nextLong();
        long rand2 = random.nextLong();
        while (rand1 == rand2) {
            rand2 = random.nextLong();
        }
        random.close();
    }

    /**
     * Test will timeout if secure random implementation always returns a 
     * constant value.
     */
    @Test(timeout = 120000)
    public void testRandomFloat() throws Exception {
        OsSecureRandom random = getOsSecureRandom();

        float rand1 = random.nextFloat();
        float rand2 = random.nextFloat();
        while (rand1 == rand2) {
            rand2 = random.nextFloat();
        }
        random.close();
    }

    /**
     * Test will timeout if secure random implementation always returns a 
     * constant value.
     */
    @Test(timeout = 120000)
    public void testRandomDouble() throws Exception {
        OsSecureRandom random = getOsSecureRandom();

        double rand1 = random.nextDouble();
        double rand2 = random.nextDouble();
        while (rand1 == rand2) {
            rand2 = random.nextDouble();
        }
        random.close();
    }

    @Test(timeout = 120000)
    public void testRefillReservoir() throws Exception {
        OsSecureRandom random = getOsSecureRandom();

        for (int i = 0; i < 8196; i++) {
            random.nextLong();
        }
        random.close();
    }
}