Java实现DES编码加解密 - 密钥为: Text

1. 编写工具类

   public class DesPasswordUtil {
   
       public static final String WIFI_DES_KEY = "TmuhP9PD";
   
       /**
        * 生成密钥
        *
        * @return {@link String }
        * @throws Exception 例外
        */
       public static SecretKeySpec createKeyFromText(String keyStr) throws Exception {
           if (keyStr.length() != 8) {
               throw new IllegalArgumentException("密钥长度必须为8个字符");
           }
           byte[] keyBytes = new byte[8];
           for (int i = 0; i < 8; i++) {
               keyBytes[i] = (byte) keyStr.charAt(i);
           }
           return new SecretKeySpec(keyBytes, "DES");
       }
   
       /**
        * 加密
        *
        * @param data 数据
        * @param key  钥匙
        * @return {@link String }
        * @throws Exception 例外
        */
       public static String encrypt(String data, SecretKeySpec key) throws Exception {
           Cipher cipher = Cipher.getInstance("DES");
           cipher.init(Cipher.ENCRYPT_MODE, key);
           byte[] encryptedBytes = cipher.doFinal(data.getBytes("UTF-8"));
           return Base64.getEncoder().encodeToString(encryptedBytes);
       }
   
       public static String decrypt(String encryptedData, SecretKeySpec key) throws Exception {
           Cipher cipher = Cipher.getInstance("DES");
           cipher.init(Cipher.DECRYPT_MODE, key);
           byte[] decodedBytes = Base64.getDecoder().decode(encryptedData);
           byte[] decryptedBytes = cipher.doFinal(decodedBytes);
           return new String(decryptedBytes, "UTF-8");
       }
   
   

2. 测试用例

   public static void main(String[] args) {
       try {
           String key = DesPasswordUtil.WIFI_DES_KEY;
           System.out.println("生成的密钥：" + DesPasswordUtil.WIFI_DES_KEY);
   
           SecretKeySpec keySpec = DesPasswordUtil.createKeyFromText(key);
   
           String data = "qwe123456!";
           String encryptedData = DesPasswordUtil.encrypt(data, keySpec);
           System.out.println("加密后的数据：" + encryptedData);
   
           String decryptedData = DesPasswordUtil.decrypt(encryptedData, keySpec);
           System.out.println("解密后的数据：" + decryptedData);
       } catch (Exception e) {
           e.printStackTrace();
       }
   }
   

3. 输出结果

   生成的密钥：TmuhP9PD
   加密后的数据：G/uUbLmmnTFL1S9oEUzsNw==
   解密后的数据：qwe123456!