RichardHJensen

public class AClassWithOnlyOnePrimitive {
    private int intValue;

    public int getIntValue() {
        return intValue;
    }

    public void setIntValue(int intValue) {
        this.intValue = intValue;
    }

RichardHJensen

public class EntryKeyIsVowel implements Predicate<Map.Entry<String,String>> {
    public boolean apply(Map.Entry<String, String> input) {
        return input.getKey().matches("^[aeiouAEIOU].*");
    }

    public boolean equals(Object obj) {
        return this.getClass() == obj.getClass();
    }

}

RichardHJensen

public class JCEExampleTest {
    @Test
    public void decryptingCiphertextShouldReturnOriginalPlaintext() {
        assertEquals("Original Plaintext", decrypt(encrypt("Original Plaintext")));
    }

    private String decrypt(String cipherText) {
        return null;
    }

RichardHJensen

public class JCEExampleTest {
    @Test
    public void decryptingCiphertextShouldReturnOriginalPlaintext() {
        assertEquals("Original Plaintext", decrypt(encrypt("Original Plaintext")));
    }

    private String decrypt(String cipherText) {
        return cipherText;
    }

RichardHJensen

        byte[] sessionKey = null;
        byte[] iv = new byte[] { 0x7F, 0x6E, 0x5D, 0x4C, 0x3B, 0x2A, 0x19, 0x08 };
        byte[] ciphertext = null;
        Cipher cipher;
        try {
            KeyGenerator kGen = KeyGenerator.getInstance("AES");
            kGen.init(128);
            sessionKey = kGen.generateKey().getEncoded();
            cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
            //You can use ENCRYPT_MODE or DECRYPT_MODE

RichardHJensen

    private String encrypt(String plainText) {
        byte[] sessionKey = null; //Where you get this from is beyond the scope of this post
        byte[] iv = null; //Ditto
        byte[] ciphertext = null;
        Cipher cipher;
        try {
            cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
            //You can use ENCRYPT_MODE or DECRYPT_MODE
            cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(sessionKey, "AES"), new IvParameterSpec(iv));

RichardHJensen

public class JCEExampleTest {
    @Test
    public void decryptingCiphertextShouldReturnOriginalPlaintext() {

    }
}

RichardHJensen

    @Test
    public void decryptingCiphertextShouldReturnOriginalPlaintext() {
        assertEquals("Original Plaintext", decrypt(encrypt("Original Plaintext")));

    }

RichardHJensen

public class JCEExampleTest {

    private byte[] sessionKey = null;
    private final byte[] iv = new byte[] { 0x7F, 0x6E, 0x5D, 0x4C, 0x3B, 0x2A, 0x19, 0x08,
                             0x77, 0x66, 0x55, 0x44, 0x33, 0x22, 0x11, 0x00 };

    @Test
    public void decryptingCiphertextShouldReturnOriginalPlaintext() {
        assertEquals("Original Plaintext", decrypt(encrypt("Original Plaintext")));
    }

RichardHJensen

    private String decrypt(String cipherText) {
        byte[] plaintext = null;
        Cipher cipher;
        try {
            cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
            //You can use ENCRYPT_MODE or DECRYPT_MODE
            cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(sessionKey, "AES"), new IvParameterSpec(iv));

            plaintext = cipher.doFinal(new sun.misc.BASE64Decoder().decodeBuffer(cipherText));
        } catch (NoSuchAlgorithmException e) {