问将任何java对象加密为base64字符串。

EN

public static void main(String[] args) throws Exception {

    // input, a date and message
    Date date = new Date();
    String message = "hello world";

    // AES-128 key (replace by a real 256 bit key in your case)
    SecretKey aesKey = new SecretKeySpec(new byte[128 / Byte.SIZE], "AES");

    // default nonce sizes for GCM, using a constant should be preferred
    int nonceSize = 96;
    int tagSize = 128;

    String cts;
    try (StringWriter stringWriter = new StringWriter(); PrintWriter out = new PrintWriter(stringWriter)) {

        for (Integer i = 0; i < 10; i++) {
            byte[] randomNonce = createRandomIV(nonceSize);
            GCMParameterSpec gcmSpec = new GCMParameterSpec(128, randomNonce);

            byte[] encodedMessage = message.getBytes(StandardCharsets.UTF_8);

            ByteBuffer encodedNumberDateAndMessage = ByteBuffer.allocate(Integer.BYTES + Long.BYTES + encodedMessage.length);

            encodedNumberDateAndMessage.putInt(i);
            encodedNumberDateAndMessage.putLong(date.getTime());
            encodedNumberDateAndMessage.put(encodedMessage);
            // for reading we need to flip the buffer
            encodedNumberDateAndMessage.flip();

            ByteBuffer encryptedNumberDateAndMessage =
                    ByteBuffer.allocate(nonceSize / Byte.SIZE + encodedNumberDateAndMessage.limit() + tagSize / Byte.SIZE);

            encryptedNumberDateAndMessage.put(randomNonce);

            Cipher gcm = Cipher.getInstance("AES/GCM/NoPadding");
            gcm.init(Cipher.ENCRYPT_MODE, aesKey, gcmSpec);

            gcm.doFinal(encodedNumberDateAndMessage, encryptedNumberDateAndMessage);
            // not required, we'll be using array() method
            // encryptedNumberDateAndMessage.flip();

            // we can use the full array as there 
            String base64Ciphertext = Base64.getEncoder().encodeToString(encryptedNumberDateAndMessage.array());
            if (i != 0) {
                out.write('\n');
            }
            out.write(base64Ciphertext);
        }
        cts = stringWriter.toString();
    }
    System.out.println(cts);

    // TODO decrypt ciphertexts in cts
    // hint use BufferedReader to read lines and don't forget to strip off the IV/Nonce first
}

private static byte[] createRandomIV(int sizeInBits) {
    if (sizeInBits % Byte.SIZE != 0) {
        throw new IllegalArgumentException("Invalid IV size, must be a multiple of 8 bits");
    }
    byte[] randomNonce = new byte[sizeInBits / Byte.SIZE];
    SecureRandom rbg = new SecureRandom();
    rbg.nextBytes(randomNonce);
    return randomNonce;
}

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public class Main {
    static Random rand = new SecureRandom();

public static IvParameterSpec generateIv() {
    byte[] ivBytes = new byte[16];
    rand.nextBytes(ivBytes);
    return new IvParameterSpec(ivBytes);
}

public static void main(String[] args) throws Exception {

    for (Integer i = 0; i < 10; i++) {

        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        ObjectOutput oos = new ObjectOutputStream(bos);
        oos.writeObject(i);
        oos.flush();

        byte[] data = bos.toByteArray();

        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        IvParameterSpec iv = generateIv();
        cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec("&E(H+MbQeThWmZq4".getBytes("UTF-8"), "AES"), iv);

        String base64output = Base64.getEncoder().encodeToString(cipher.doFinal(data));
        System.out.println(i + " - " + base64output);
    }
}
}

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