java私人封装的加密jar包以及使用

浅浅的花香味﹌ 2022-06-07 06:00 198阅读 0赞

此加密方法使用密匙所以加密之后的字段内容无法做模糊查询。

测试示例结果：

![Center][]

pom.xml 加入jar依赖:

<dependency>
     <groupId>com.daixinlian</groupId>
     <artifactId>daixinlian_commons</artifactId>
     <version>1.0</version>
    </dependency>

jar包内容：

package com.daixinlian.common.encrypt;
    
    import java.security.Key;
    import java.security.SecureRandom;
    import javax.crypto.Cipher;
    import javax.crypto.KeyGenerator;
    import sun.misc.BASE64Decoder;
    import sun.misc.BASE64Encoder;
    
    public class DESUtils
    {
      private static Key key;
      private static String KEY_STR = "abcdefg";//此处为一个公共密匙
      
      static {
        try { KeyGenerator generator = KeyGenerator.getInstance("DESede");
          SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
          secureRandom.setSeed(KEY_STR.getBytes());
          generator.init(secureRandom);
          
          key = generator.generateKey();
          generator = null;
        } catch (Exception e) {
          throw new RuntimeException(e);
        }
      }
      
      public static String getEncryptString(String str)
      {
        if (str == null) {
          return null;
        }
        BASE64Encoder base64en = new BASE64Encoder();
        try {
          byte[] strBytes = str.getBytes("UTF8");
          Cipher cipher = Cipher.getInstance("DESede");
          cipher.init(1, key);
          byte[] encryptStrBytes = cipher.doFinal(strBytes);
          return base64en.encode(encryptStrBytes);
        } catch (Exception e) {
          throw new RuntimeException(e);
        }
      }
      
      public static String getDecryptString(String str)
      {
        if (str == null) {
          return null;
        }
        BASE64Decoder base64De = new BASE64Decoder();
        try {
          byte[] strBytes = base64De.decodeBuffer(str);
          Cipher cipher = Cipher.getInstance("DESede");
          cipher.init(2, key);
          byte[] decryptStrBytes = cipher.doFinal(strBytes);
          return new String(decryptStrBytes, "UTF8");
        } catch (Exception e) {
          e.printStackTrace(); }
        return str;
      }
    }

使用方法：

String encrypStr = DESUtils.getEncryptString("需要加密的字符");//返回加密字符串  
  
String decryptStr = DESUtils.getDecryptString("需要解密的字符"); //返回明文数据

代码操作示例：![Center 1][]

[Center]: /images/20220607/70acd3ced1794ec1bcc28d5d01fed960.png
[Center 1]: /images/20220607/7e850c0950524213ba666fc6b88357c7.png