CipherNCFuncTest.java

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/*
 * @test
 * @bug 8048604
 * @library ../ /lib/testlibrary
 * @summary This test verifies the assertion "There should be no transformation
 *  on the plaintext/ciphertext in encryption/decryption mechanism" for
 *  feature "NullCipher".
 */
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NullCipher;
import javax.crypto.ShortBufferException;
import jdk.testlibrary.RandomFactory;

public class CipherNCFuncTest {
    public static void main(String[] args) throws ShortBufferException,
            IllegalBlockSizeException, BadPaddingException {
        byte[] plainText = new byte[801];
        // Initialization
        RandomFactory.getRandom().nextBytes(plainText);
        Cipher ci = new NullCipher();
        // Encryption
        byte[] cipherText = new byte[ci.getOutputSize(plainText.length)];
        int offset = ci.update(plainText, 0, plainText.length, cipherText, 0);
        ci.doFinal(cipherText, offset);
        // Decryption
        byte[] recoveredText = new byte[ci.getOutputSize(cipherText.length)];
        int len = ci.doFinal(cipherText, 0, cipherText.length, recoveredText);
        // Comparison
        if (len != plainText.length ||
                !TestUtilities.equalsBlock(plainText, cipherText, len) ||
                !TestUtilities.equalsBlock(plainText, recoveredText, len)) {
            throw new RuntimeException(
                "Test failed because plainText not equal to cipherText and revoveredText");
        }
    }
}