微信小程序獲取用戶信息後的解密操作

會對下面的結果進行操作

https://api.weixin.qq.com/sns/jscode2session?appid=APPID&secret=SECRET&js_code=JSCODE&grant_type=authorization_code

java解密操作

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.codec.binary.Base64;
/**
     * 獲取信息
     */
    public JSONObject getUserInfo(String encryptedData,String sessionkey,String iv){
        // 被加密的數據
        byte[] dataByte = Base64.decodeBase64(encryptedData);
        // 加密祕鑰
        byte[] keyByte = Base64.decodeBase64(sessionkey);
        // 偏移量
        byte[] ivByte = Base64.decodeBase64(iv);
        try {
               // 如果密鑰不足16位，那麼就補足.  這個if 中的內容很重要
            int base = 16;
            if (keyByte.length % base != 0) {
                int groups = keyByte.length / base + (keyByte.length % base != 0 ? 1 : 0);
                byte[] temp = new byte[groups * base];
                Arrays.fill(temp, (byte) 0);
                System.arraycopy(keyByte, 0, temp, 0, keyByte.length);
                keyByte = temp;
            }
            // 初始化
            Security.addProvider(new BouncyCastleProvider());
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding","BC");
            SecretKeySpec spec = new SecretKeySpec(keyByte, "AES");
            AlgorithmParameters parameters = AlgorithmParameters.getInstance("AES");
            parameters.init(new IvParameterSpec(ivByte));
            cipher.init(Cipher.DECRYPT_MODE, spec, parameters);// 初始化
            byte[] resultByte = cipher.doFinal(dataByte);
            if (null != resultByte && resultByte.length > 0) {
                String result = new String(resultByte, "UTF-8");
                return JSONObject.parseObject(result);
            }
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
        } catch (InvalidParameterSpecException e) {
            e.printStackTrace();
        } catch (IllegalBlockSizeException e) {
            e.printStackTrace();
        } catch (BadPaddingException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (InvalidKeyException e) {
            e.printStackTrace();
        } catch (InvalidAlgorithmParameterException e) {
            e.printStackTrace();
        } catch (NoSuchProviderException e) {
            e.printStackTrace();
        }
        return null;
    }

C#獲取用戶信息代碼

/// <summary> 
        /// AES解密 
        /// </summary> 
        /// <param name="inputdata">輸入的數據encryptedData</param> 
        /// <param name="AesKey">key</param> 
        /// <param name="AesIV">向量128</param> 
        /// <returns name="result">解密後的字符串</returns> 
        public string AESDecrypt(string inputdata, String AesKey, String AesIV)
        {
            try
            {
                AesIV = AesIV.Replace(" ", "+");
                AesKey = AesKey.Replace(" ", "+");
                inputdata = inputdata.Replace(" ", "+");
                byte[] encryptedData = Convert.FromBase64String(inputdata);

                RijndaelManaged rijndaelCipher = new RijndaelManaged();
                rijndaelCipher.Key = Convert.FromBase64String(AesKey); // Encoding.UTF8.GetBytes(AesKey); 
                rijndaelCipher.IV = Convert.FromBase64String(AesIV);// Encoding.UTF8.GetBytes(AesIV); 
                rijndaelCipher.Mode = CipherMode.CBC;
                rijndaelCipher.Padding = PaddingMode.PKCS7;
                ICryptoTransform transform = rijndaelCipher.CreateDecryptor();
                byte[] plainText = transform.TransformFinalBlock(encryptedData, 0, encryptedData.Length);
                string result = Encoding.UTF8.GetString(plainText);

                return result;
            }
            catch (Exception)
            {
                return null;

            }
        }