content: package cn.org.alan.exam.utils;
  
  import org.apache.tomcat.util.codec.binary.Base64;
  import org.springframework.stereotype.Component;
  
  import javax.crypto.Cipher;
  import javax.crypto.spec.IvParameterSpec;
  import javax.crypto.spec.SecretKeySpec;
  
  /**
   * 安全工具类
   *
   * @Author Alan
   * @Version
   * @Date 2024/6/8 9:57 AM
   */
  @Component
  public class SecretUtils {
      /***
       * key和iv值可以随机生成
       */
      private static String KEY = "63eeac68cf074c8c";
  
      private static String IV = "63eeac68cf074c8c";
  
      /***
       * 加密
       * @param  data 要加密的数据
       * @return encrypt
       */
      public static String encrypt(String data) {
          return encrypt(data, KEY, IV);
      }
  
      /***
       * param data 需要解密的数据
       * 调用desEncrypt（）方法
       */
      public static String desEncrypt(String data) {
          return desEncrypt(data, KEY, IV);
      }
  
      /**
       * 加密方法
       *
       * @param data 要加密的数据
       * @param key  加密key
       * @param iv   加密iv
       * @return 加密的结果
       */
      private static String encrypt(String data, String key, String iv) {
          try {
              //"算法/模式/补码方式"NoPadding PkcsPadding
              Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
              int blockSize = cipher.getBlockSize();
  
              byte[] dataBytes = data.getBytes();
              int plaintextLength = dataBytes.length;
              if (plaintextLength % blockSize != 0) {
                  plaintextLength = plaintextLength + (blockSize - (plaintextLength % blockSize));
              }
  
              byte[] plaintext = new byte[plaintextLength];
              System.arraycopy(dataBytes, 0, plaintext, 0, dataBytes.length);
  
              SecretKeySpec keyspec = new SecretKeySpec(key.getBytes(), "AES");
              IvParameterSpec ivspec = new IvParameterSpec(iv.getBytes());
  
              cipher.init(Cipher.ENCRYPT_MODE, keyspec, ivspec);
              byte[] encrypted = cipher.doFinal(plaintext);
  
  //            return new Base64().encodeToString(encrypted);
              return Base64.encodeBase64String(encrypted);
  
          } catch (Exception e) {
              e.printStackTrace();
              return null;
          }
      }
  
      /**
       * 解密方法
       *
       * @param data 要解密的数据
       * @param key  解密key
       * @param iv   解密iv
       * @return 解密的结果
       */
      private static String desEncrypt(String data, String key, String iv) {
          try {
              byte[] encrypted1 = new Base64().decode(data);
  
              Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
              SecretKeySpec keySpec = new SecretKeySpec(key.getBytes(), "AES");
              IvParameterSpec ivSpec = new IvParameterSpec(iv.getBytes());
              cipher.init(Cipher.DECRYPT_MODE, keySpec, ivSpec);
              byte[] original = cipher.doFinal(encrypted1);
              return new String(original).trim();
          } catch (Exception e) {
              e.printStackTrace();
              return null;
          }
      }
  
  }
  
  