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CryptoTest.javaAPI DocAndroid 1.5 API5005Wed May 06 22:42:02 BST 2009android.core

CryptoTest

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

Fields Summary
Constructors Summary
Methods Summary
public voiddoTestMessageDigest(org.bouncycastle.crypto.Digest oldDigest, org.bouncycastle.crypto.Digest newDigest)
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

        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);
public voidtestMD2()
Tests the MD2 implementation.

        Digest oldDigest = new MD2Digest();
        Digest newDigest = OpenSSLMessageDigest.getInstance("MD2");
        doTestMessageDigest(oldDigest, newDigest);
public voidtestMD4()
Tests the MD4 implementation.

        Digest oldDigest = new MD4Digest();
        Digest newDigest = OpenSSLMessageDigest.getInstance("MD4");
        doTestMessageDigest(oldDigest, newDigest);
public voidtestMD5()
Tests the MD5 implementation.

        Digest oldDigest = new MD5Digest();
        Digest newDigest = OpenSSLMessageDigest.getInstance("MD5");
        doTestMessageDigest(oldDigest, newDigest);
public voidtestSHA1()
Tests the SHA-1 implementation.

        Digest oldDigest = new SHA1Digest();
        Digest newDigest = OpenSSLMessageDigest.getInstance("SHA-1");
        doTestMessageDigest(oldDigest, newDigest);