微信小程序加密数据解密算法 java

获取用户头像、昵称、手机号等授权信息，需解密

java 微信小程序加密数据解密算法

 1     /**
 2      * 加密数据解密
 3      *
 4      * @param encryptedData
 5      * @param sessionKey
 6      * @param iv
 7      * @return
 8      */
 9     private String decrypt(String encryptedData, String sessionKey, String iv) {
10         String result = "";
11         try {
12             byte[] resultByte = AES.decrypt(Base64.decodeBase64(encryptedData),
13                     Base64.decodeBase64(sessionKey),
14                     Base64.decodeBase64(iv));
15             if (null != resultByte && resultByte.length > 0) {
16                 result = new String(resultByte, "UTF-8");
17             }
18         } catch (Exception e) {
19             e.printStackTrace();
20         }
21         return result;
22     }

AES 解密工具类

 1 import org.bouncycastle.jce.provider.BouncyCastleProvider;
 2 
 3 import javax.crypto.BadPaddingException;
 4 import javax.crypto.Cipher;
 5 import javax.crypto.IllegalBlockSizeException;
 6 import javax.crypto.NoSuchPaddingException;
 7 import javax.crypto.spec.IvParameterSpec;
 8 import javax.crypto.spec.SecretKeySpec;
 9 import java.security.*;
10 
11 public class AES {
12     public static boolean initialized = false;
13 
14     /**
15      * AES解密
16      *
17      * @param content
18      *            密文
19      * @return
20      * @throws InvalidAlgorithmParameterException
21      * @throws NoSuchProviderException
22      */
23     public static byte[] decrypt(byte[] content, byte[] keyByte, byte[] ivByte) throws InvalidAlgorithmParameterException {
24         initialize();
25         try {
26             Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding");
27             Key sKeySpec = new SecretKeySpec(keyByte, "AES");
28             cipher.init(Cipher.DECRYPT_MODE, sKeySpec, generateIv(ivByte));// 初始化
29             byte[] result = cipher.doFinal(content);
30             return result;
31         } catch (NoSuchAlgorithmException e) {
32             e.printStackTrace();
33         } catch (NoSuchPaddingException e) {
34             e.printStackTrace();
35         } catch (InvalidKeyException e) {
36             e.printStackTrace();
37         } catch (IllegalBlockSizeException e) {
38             e.printStackTrace();
39         } catch (BadPaddingException e) {
40             e.printStackTrace();
41         } catch (NoSuchProviderException e) {
42             // TODO Auto-generated catch block
43             e.printStackTrace();
44         } catch (Exception e) {
45             // TODO Auto-generated catch block
46             e.printStackTrace();
47         }
48         return null;
49     }
50 
51     public static void initialize() {
52         if (initialized) {
53             return;
54         }
55         Security.addProvider(new BouncyCastleProvider());
56         initialized = true;
57     }
58 
59     // 生成iv
60     public static AlgorithmParameters generateIv(byte[] iv) throws Exception {
61         AlgorithmParameters params = AlgorithmParameters.getInstance("AES");
62         params.init(new IvParameterSpec(iv));
63         return params;
64     }
65 }

View Code

以下情况，有可能导致解密失效：

1、短时间的多次 wx.login

2、授权回调里，又再次 wx.login

也就是，没事不要瞎调用 wx.login