android-platform-libcore/luni/src/test/java/tests/security/SecureRandomTest.java

/*
 * Copyright (C) 2009 The Android Open Source Project
 *
 * Licensed 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 tests.security;

import dalvik.annotation.TestLevel;
import dalvik.annotation.TestTargetNew;
import dalvik.annotation.TestTargets;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.util.Arrays;
import junit.framework.TestCase;
public abstract class SecureRandomTest extends TestCase {


    private final String algorithmName;

    private int counter=0;

    protected SecureRandomTest(String name) {
        this.algorithmName = name;
    }

    protected void setUp() throws Exception {
        super.setUp();
    }

    @TestTargets({
        @TestTargetNew(
                level=TestLevel.ADDITIONAL,
                method="getInstance",
                args={String.class}
        ),
        @TestTargetNew(
                level=TestLevel.ADDITIONAL,
                method="setSeed",
                args={long.class}
        ),
        @TestTargetNew(
                level=TestLevel.ADDITIONAL,
                method="nextBytes",
                args={byte[].class}
        ),
        @TestTargetNew(
                level=TestLevel.COMPLETE,
                method="method",
                args={}
        )
    })
    public void testSecureRandom() {
        SecureRandom secureRandom1 = null;
        try {
            secureRandom1 = SecureRandom.getInstance(algorithmName);
        } catch (NoSuchAlgorithmException e) {
            fail(e.getMessage());
        }

        SecureRandom secureRandom2 = null;
        try {
            secureRandom2 = SecureRandom.getInstance(algorithmName);
        } catch (NoSuchAlgorithmException e) {
            fail(e.getMessage());
        }

        byte[] testRandom1 = getRandomBytes(secureRandom1);
        byte[] testRandom2 = getRandomBytes(secureRandom2);

        assertFalse(Arrays.equals(testRandom1, testRandom2));


    }

    private byte[] getRandomBytes(SecureRandom random) {
        byte[] randomData = new byte[64];

        random.setSeed(System.currentTimeMillis()+counter);
        counter++;

        random.nextBytes(randomData);

        return randomData;
    }
}