新增小程序调用示例

新增小程序调用示例

Author: Leslin

application/api/utils/wxBizDataCrypt.php

@@ -0,0 +1,68 @@
+<?php
+namespace app\api\utils;
+
+/**
+ * 
+ */
+class wxBizDataCrypt
+{
+
+public static $OK = 0;
+public static $IllegalAesKey = -41001;
+public static $IllegalIv = -41002;
+public static $IllegalBuffer = -41003;
+public static $DecodeBase64Error = -41004;
+
+private $appid;
+private $sessionKey;
+
+/**
+ * 构造函数
+ * @param $sessionKey string 用户在小程序登录后获取的会话密钥
+ * @param $appid string 小程序的appid
+ */
+public function __construct( $appid, $sessionKey)
+{
+$this->sessionKey = $sessionKey;
+$this->appid = $appid;
+}
+
+
+/**
+ * 检验数据的真实性，并且获取解密后的明文.
+ * @param $encryptedData string 加密的用户数据
+ * @param $iv string 与用户数据一同返回的初始向量
+ * @param $data string 解密后的原文
+ *
+ * @return int 成功0，失败返回对应的错误码
+ */
+public function decryptData( $encryptedData, $iv )
+{
+if (strlen($this->sessionKey) != 24) {
+return self::$IllegalAesKey;
+}
+$aesKey=base64_decode($this->sessionKey);
+
+ 
+if (strlen($iv) != 24) {
+return self::$IllegalIv;
+}
+$aesIV=base64_decode($iv);
+
+$aesCipher=base64_decode($encryptedData);
+
+$result=openssl_decrypt( $aesCipher, "AES-128-CBC", $aesKey, 1, $aesIV);
+
+$dataObj=json_decode( $result );
+if( $dataObj == NULL )
+{
+return self::$IllegalBuffer;
+}
+if( $dataObj->watermark->appid != $this->appid )
+{
+return self::$IllegalBuffer;
+}
+$data = $result;
+return $data;
+}
+}