DES加解密

 package encrypt;

 import java.security.Key;
 import java.security.SecureRandom;
 import java.util.Base64;
 import java.util.Base64.Decoder;
 import java.util.Base64.Encoder;

 import javax.crypto.Cipher;
 import javax.crypto.KeyGenerator;

 public class DESUtil {
     private static Key key;
     private static String KEY_STR="myKey";//密钥
     static{
         try {
             KeyGenerator generator = KeyGenerator.getInstance("DES");
             generator.init(new SecureRandom(KEY_STR.getBytes()));
             key = generator.generateKey();
             generator=null;
         } catch (Exception e) {

         }
     }

     public static String getEncryptString(String str){
         Encoder base64Encoder = Base64.getEncoder();
         try {
             byte[] strBytes = str.getBytes("UTF-8");
             Cipher cipher = Cipher.getInstance("DES");
             cipher.init(Cipher.ENCRYPT_MODE, key);
             byte[] encryptStrBytes = cipher.doFinal(strBytes);
             return base64Encoder.encodeToString(encryptStrBytes);
         } catch (Exception e) {
             e.printStackTrace();
         }
         return null;
     }

     public static String getDecryptString(String str){
         Decoder base64Decoder = Base64.getDecoder();
         try {
             byte[] strBytes = base64Decoder.decode(str);
             Cipher cipher = Cipher.getInstance("DES");
             cipher.init(cipher.DECRYPT_MODE, key);
             byte[] decryptStrBytes = cipher.doFinal(strBytes);
             return new String(decryptStrBytes,"UTF-8");
         } catch (Exception e) {
         }
         return null;

     }
     public static void main(String[] args) {
         System.out.println(DESUtil.getEncryptString("147258"));
         System.out.println(DESUtil.getDecryptString("VUhJSh5OPvI="));
     }
 }

https://www.cnblogs.com/wulm/p/6907197.html