1 package encrypt;
2
3 import java.security.Key;
4 import java.security.SecureRandom;
5 import java.util.Base64;
6 import java.util.Base64.Decoder;
7 import java.util.Base64.Encoder;
8
9 import javax.crypto.Cipher;
10 import javax.crypto.KeyGenerator;
11
12 public class DESUtil {
13 private static Key key;
14 private static String KEY_STR="myKey";//密钥
15 static{
16 try {
17 KeyGenerator generator = KeyGenerator.getInstance("DES");
18 generator.init(new SecureRandom(KEY_STR.getBytes()));
19 key = generator.generateKey();
20 generator=null;
21 } catch (Exception e) {
22
23 }
24 }
25
26 public static String getEncryptString(String str){
27 Encoder base64Encoder = Base64.getEncoder();
28 try {
29 byte[] strBytes = str.getBytes("UTF-8");
30 Cipher cipher = Cipher.getInstance("DES");
31 cipher.init(Cipher.ENCRYPT_MODE, key);
32 byte[] encryptStrBytes = cipher.doFinal(strBytes);
33 return base64Encoder.encodeToString(encryptStrBytes);
34 } catch (Exception e) {
35 e.printStackTrace();
36 }
37 return null;
38 }
39
40 public static String getDecryptString(String str){
41 Decoder base64Decoder = Base64.getDecoder();
42 try {
43 byte[] strBytes = base64Decoder.decode(str);
44 Cipher cipher = Cipher.getInstance("DES");
45 cipher.init(cipher.DECRYPT_MODE, key);
46 byte[] decryptStrBytes = cipher.doFinal(strBytes);
47 return new String(decryptStrBytes,"UTF-8");
48 } catch (Exception e) {
49 }
50 return null;
51
52 }
53 public static void main(String[] args) {
54 System.out.println(DESUtil.getEncryptString("147258"));
55 System.out.println(DESUtil.getDecryptString("VUhJSh5OPvI="));
56 }
57 }
https://www.cnblogs.com/wulm/p/6907197.html
