2022年9月记录（AES加密）

1.AES加密

参考Java 中的加密算法： AES - 知乎

    public static byte[] encryptECB(byte[] data, byte[] key) throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
        Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
        cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(key, "AES"));
        byte[] result = cipher.doFinal(data);
        return result;
    }

    public static byte[] decryptECB(byte[] data, byte[] key) throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
        Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
        cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(key, "AES"));
        byte[] result = cipher.doFinal(data);
        return result;
    }

//    public static void main(String[] args) throws IllegalBlockSizeException, InvalidKeyException, BadPaddingException, NoSuchAlgorithmException, NoSuchPaddingException {
//        String data = "123"; // 待加密的明文
//        String key = "11abcdef11abcdef"; // key 长度只能是 16、24 或 32 字节
//
//        byte[] ciphertext = encryptECB(data.getBytes(), key.getBytes());
//        System.out.println("ECB 模式加密结果（Base64）：" + Base64.getEncoder().encodeToString(ciphertext));
//
//        byte[] plaintext = decryptECB(ciphertext, key.getBytes());
//        System.out.println("解密结果：" + new String(plaintext));
//    }
    public static byte[] encryptCBC(byte[] data, byte[] key, byte[] iv) throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException, InvalidAlgorithmParameterException {
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(key, "AES"), new IvParameterSpec(iv));
        byte[] result = cipher.doFinal(data);
        return result;
    }

    public static byte[] decryptCBC(byte[] data, byte[] key, byte[] iv) throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException, InvalidAlgorithmParameterException {
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(key, "AES"), new IvParameterSpec(iv));
        byte[] result = cipher.doFinal(data);
        return result;
    }

    public static void main(String[] args) throws IllegalBlockSizeException, InvalidKeyException, BadPaddingException, NoSuchAlgorithmException, NoSuchPaddingException, InvalidAlgorithmParameterException {
        String data = "Hello World"; // 待加密的原文
        String key = "12345678abcdefgh"; // key 长度只能是 16、24 或 32 字节
        String iv = "iviviviviviviviv"; // CBC 模式需要用到初始向量参数

        byte[] ciphertext = encryptCBC(data.getBytes(), key.getBytes(), iv.getBytes());
        System.out.println("CBC 模式加密结果（Base64）：" + Base64.getEncoder().encodeToString(ciphertext));

        byte[] plaintext = decryptCBC(ciphertext, key.getBytes(), iv.getBytes());
        System.out.println("解密结果：" + new String(plaintext));
    }

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