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Android example source code file (CryptoTest.java)

This example Android source code file (CryptoTest.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" TM.

Java - Android tags/keywords

android, cryptotest, digest, hash, hashes, iterations, md4, md4digest, md5digest, mediumtest, sha-1, sha1digest, test, testcase, time

The CryptoTest.java Android example source code

/*
 * Copyright (C) 2008 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 android.core;

import junit.framework.Assert;
import junit.framework.TestCase;

import org.apache.harmony.xnet.provider.jsse.OpenSSLMessageDigest;
import org.bouncycastle.crypto.Digest;
import org.bouncycastle.crypto.ExtendedDigest;
import org.bouncycastle.crypto.digests.MD4Digest;
import org.bouncycastle.crypto.digests.MD5Digest;
import org.bouncycastle.crypto.digests.SHA1Digest;
import android.test.suitebuilder.annotation.LargeTest;
import android.test.suitebuilder.annotation.MediumTest;

/**
 * Implements unit tests for our JNI wrapper around OpenSSL. We use the
 * existing Bouncy Castle implementation as our test oracle.
 */
public class CryptoTest extends TestCase {

    /**
     * Processes the two given message digests for the same data and checks
     * the results. Requirement is that the results must be equal, the digest
     * implementations must have the same properties, and the new implementation
     * must be faster than the old one.
     * 
     * @param oldDigest The old digest implementation, provided by Bouncy Castle 
     * @param newDigest The new digest implementation, provided by OpenSSL
     */
    public void doTestMessageDigest(Digest oldDigest, Digest newDigest) {
        final int ITERATIONS = 10;
        
        byte[] data = new byte[1024];
        
        byte[] oldHash = new byte[oldDigest.getDigestSize()];
        byte[] newHash = new byte[newDigest.getDigestSize()];
        
        Assert.assertEquals("Hash names must be equal", oldDigest.getAlgorithmName(), newDigest.getAlgorithmName());
        Assert.assertEquals("Hash sizes must be equal", oldHash.length, newHash.length);
        Assert.assertEquals("Hash block sizes must be equal", ((ExtendedDigest)oldDigest).getByteLength(), ((ExtendedDigest)newDigest).getByteLength());
        for (int i = 0; i < data.length; i++) {
            data[i] = (byte)i;
        }

        long oldTime = 0;
        long newTime = 0;
        
        for (int j = 0; j < ITERATIONS; j++) {
            long t0 = System.currentTimeMillis();
            for (int i = 0; i < 4; i++) {
                oldDigest.update(data, 0, data.length);
            }
            int oldLength = oldDigest.doFinal(oldHash, 0);
            long t1 = System.currentTimeMillis();
    
            oldTime = oldTime + (t1 - t0);
            
            long t2 = System.currentTimeMillis();
            for (int i = 0; i < 4; i++) {
                newDigest.update(data, 0, data.length);
            }
            int newLength = newDigest.doFinal(newHash, 0);
            long t3 = System.currentTimeMillis();

            newTime = newTime + (t3 - t2);
            
            Assert.assertEquals("Hash sizes must be equal", oldLength, newLength);
    
            for (int i = 0; i < oldLength; i++) {
                Assert.assertEquals("Hashes[" + i + "] must be equal", oldHash[i], newHash[i]);
            }
        }

        android.util.Log.d("CryptoTest", "Time for " + ITERATIONS + " x old hash processing: " + oldTime + " ms");
        android.util.Log.d("CryptoTest", "Time for " + ITERATIONS + " x new hash processing: " + newTime + " ms");
        
        // Assert.assertTrue("New hash should be faster", newTime < oldTime);
    }
    
    /**
     * Tests the MD4 implementation.
     */
    @MediumTest
    public void testMD4() {
        Digest oldDigest = new MD4Digest();
        Digest newDigest = OpenSSLMessageDigest.getInstance("MD4");
        doTestMessageDigest(oldDigest, newDigest);
    }
    
    /**
     * Tests the MD5 implementation.
     */
    @MediumTest
    public void testMD5() {
        Digest oldDigest = new MD5Digest();
        Digest newDigest = OpenSSLMessageDigest.getInstance("MD5");
        doTestMessageDigest(oldDigest, newDigest);
    }
    
    /**
     * Tests the SHA-1 implementation.
     */
    @MediumTest
    public void testSHA1() {
        Digest oldDigest = new SHA1Digest();
        Digest newDigest = OpenSSLMessageDigest.getInstance("SHA-1");
        doTestMessageDigest(oldDigest, newDigest);
    }
    
}

Other Android examples (source code examples)

Here is a short list of links related to this Android CryptoTest.java source code file:

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