信息计算2019级2班4号袁敏婷

袁敏婷

4.5MOOC视频

袁敏婷

1. package mimaxue;
   
2. import java.util.Base64;
   
3. import javax.crypto.Cipher;
   
4. import javax.crypto.spec.IvParameterSpec;
   
5. import javax.crypto.spec.SecretKeySpec;
   
6. public class AES {
   
7.     private static final String defaultV = "6859505890402435";
   
8.     private static final String key = "好好学习,天天向上";
   
9.     private static SecretKeySpec getKey(String strKey) throws Exception {
   
10.         byte[] arrBTmp = strKey.getBytes();
    
11.         byte[] arrB = new byte[16];
    
12.         for (int i = 0; i < arrBTmp.length && i < arrB.length; i++) {
    
13.             arrB[i] = arrBTmp[i];
    
14.         }
    
15.         SecretKeySpec skeySpec = new SecretKeySpec(arrB, "AES");
    
16.         return skeySpec;
    
17.     }
    
18.    
    
19.     public static String encryptBase64(String content) throws Exception {
    
20.                 final Base64.Encoder encoder = Base64.getEncoder();
    
21.         SecretKeySpec skeySpec = getKey(key);
    
22.         Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
    
23.         IvParameterSpec iv = new IvParameterSpec(defaultV.getBytes());
    
24.         cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
    
25.         byte[] encrypted = cipher.doFinal(content.getBytes());
    
26.         String encodedText = encoder.encodeToString(encrypted);
    
27.         return encodedText;
    
28.     }
    
29.    
    
30.     public static String decryptBase64(String content) throws Exception {
    
31.             final Base64.Decoder decoder = Base64.getDecoder();
    
32.             SecretKeySpec skeySpec = getKey(key);
    
33.         Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
    
34.         IvParameterSpec iv = new IvParameterSpec(defaultV.getBytes());
    
35.         cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
    
36.         byte[] base64 = decoder.decode(content);
    
37.         byte[] original = cipher.doFinal(base64);
    
38.         String originalString = new String(original);
    
39.         return originalString;
    
40.     }
    
41. 
    
42.     public static void main(String[] args) throws Exception {
    
43.             String encryptBase64 = encryptBase64("明文：信息计算2019级2班4号袁敏婷");
    
44.             System.out.println("密文："+encryptBase64);
    
45.             String decryptBase64 = decryptBase64(encryptBase64);
    
46.             System.out.println(decryptBase64);
    
47.         }
    
48. }

复制代码