微信小程序获取用户信息后的解密操作

叁歲伎倆 2022-04-23 12:28 277阅读 0赞

会对下面的结果进行操作

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;
    /**
         * 获取信息
         */
        public JSONObject getUserInfo(String encryptedData,String sessionkey,String iv){
            // 被加密的数据
            byte[] dataByte = Base64.decodeBase64(encryptedData);
            // 加密秘钥
            byte[] keyByte = Base64.decodeBase64(sessionkey);
            // 偏移量
            byte[] ivByte = Base64.decodeBase64(iv);
            try {
                   // 如果密钥不足16位，那么就补足.  这个if 中的内容很重要
                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\#获取用户信息代码

/// <summary> 
            /// AES解密 
            /// </summary> 
            /// <param name="inputdata">输入的数据encryptedData</param> 
            /// <param name="AesKey">key</param> 
            /// <param name="AesIV">向量128</param> 
            /// <returns name="result">解密后的字符串</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;
    
                }
            }