JAVA Aes加密解密

Aes 加密两种方式为什么加出来的不一样？求大神讲解

第一种

 1    /**
 2      * 加密
 3      * @param content
 4      * @param keyBytes
 5      * @param iv
 6      * @return
 7      * @throws Exception
 8      */
 9     public String AES_CBC_Encrypt(byte[] content, byte[] keyBytes, byte[] iv) throws Exception{
10         try{
11             KeyGenerator keyGenerator= KeyGenerator.getInstance("AES");
12             keyGenerator.init(128, new SecureRandom(keyBytes) );
13             SecretKey key=keyGenerator.generateKey();
14             Cipher cipher=Cipher.getInstance("AES/CBC/PKCS5Padding");
15             cipher.init(Cipher.ENCRYPT_MODE, key, new IvParameterSpec(iv));
16             byte[] result=cipher.doFinal(content);
17             return Base64.encodeBase64String(result);
18         }catch (Exception e) {
19             e.printStackTrace();
20             throw e;
21         }
22     }
23 
24     /**
25      * 解密
26      * @param content
27      * @param keyBytes
28      * @param iv
29      * @return
30      * @throws Exception
31      */
32     public String AES_CBC_Decrypt(byte[] content, byte[] keyBytes, byte[] iv) throws Exception{
33         try{
34 
35             KeyGenerator keyGenerator=KeyGenerator.getInstance("AES");
36             keyGenerator.init(128, new SecureRandom(keyBytes));//key长可设为128，192，256位，这里只能设为128
37             SecretKey key=keyGenerator.generateKey();
38             Cipher cipher=Cipher.getInstance("AES/CBC/PKCS5Padding");
39             cipher.init(Cipher.DECRYPT_MODE, key, new IvParameterSpec(iv));
40 
41             byte[] result=cipher.doFinal(content);
42             return Base64.encodeBase64String(result);
43         }catch (Exception e) {
44             e.printStackTrace();
45             throw e;
46         }
47     }

第二种

 1 /**
 2      * 提供密钥和向量进行加密
 3      *
 4      * @param sSrc
 5      * @param key
 6      * @param iv
 7      * @return
 8      * @throws Exception
 9      */
10     public static String Encrypt(String sSrc, byte[] key, byte[] iv) throws Exception {
11         SecretKeySpec skeySpec = new SecretKeySpec(key, "AES");
12         Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");// "算法/模式/补码方式"
13         IvParameterSpec _iv = new IvParameterSpec(iv);// 使用CBC模式，需要一个向量iv，可增加加密算法的强度
14         cipher.init(Cipher.ENCRYPT_MODE, skeySpec, _iv);
15         byte[] encrypted = cipher.doFinal(sSrc.getBytes("utf-8"));
16         return Base64.encodeBase64String(encrypted);
17     }
18     /**
19      * 提供密钥和向量进行解密
20      *
21      * @param sSrc
22      * @param key
23      * @param iv
24      * @return
25      * @throws Exception
26      */
27     public static String Decrypt(String sSrc, byte[] key, byte[] iv) throws Exception {
28         SecretKeySpec skeySpec = new SecretKeySpec(key, "AES");
29         Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
30         IvParameterSpec _iv = new IvParameterSpec(iv);
31         cipher.init(Cipher.DECRYPT_MODE, skeySpec, _iv);
32         byte[] encrypted = Base64.decodeBase64(sSrc);
33         byte[] original = cipher.doFinal(encrypted);
34         return new String(original, "utf-8");
35     }