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							69 lines
						
					
					
						
							1.6 KiB
						
					
					
				
			
		
		
		
			
			
			
				
					
				
				
					
				
			
		
		
	
	
							69 lines
						
					
					
						
							1.6 KiB
						
					
					
				
								<?php
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								/**
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								 * 对微信小程序用户加密数据的解密示例代码.
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								 *
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								 * @copyright Copyright (c) 1998-2014 Tencent Inc.
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								 */
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								include_once "errorCode.php";
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								class WXBizDataCrypt
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								{
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								    private $appid;
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								    private $sessionKey;
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								    /**
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								     * 构造函数
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								     * @param $sessionKey string 用户在小程序登录后获取的会话密钥
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								     * @param $appid string 小程序的appid
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								     */
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								    public function __construct( $appid, $sessionKey)
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								    {
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								        $this->sessionKey = $sessionKey;
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								        $this->appid = $appid;
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								    }
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								    /**
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								     * 检验数据的真实性,并且获取解密后的明文.
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								     * @param $encryptedData string 加密的用户数据
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								     * @param $iv string 与用户数据一同返回的初始向量
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								     * @param $data string 解密后的原文
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								     *
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								     * @return int 成功0,失败返回对应的错误码
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								     */
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								    public function decryptData( $encryptedData, $iv, &$data )
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								    {
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								        if (strlen($this->sessionKey) != 24) {
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								            return ErrorCode::$IllegalAesKey;
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								        }
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								        $aesKey=base64_decode($this->sessionKey);
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								        if (strlen($iv) != 24) {
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								            return ErrorCode::$IllegalIv;
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								        }
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								        $aesIV=base64_decode($iv);
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								        $aesCipher=base64_decode($encryptedData);
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								        $result=openssl_decrypt( $aesCipher, "AES-128-CBC", $aesKey, 1, $aesIV);
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								        $dataObj=json_decode( $result );
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								        if( $dataObj  == NULL )
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								        {
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								            return ErrorCode::$IllegalBuffer;
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								        }
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								        if( $dataObj->watermark->appid != $this->appid )
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								        {
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								            return ErrorCode::$IllegalBuffer;
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								        }
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								        $data = $result;
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								        return ErrorCode::$OK;
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								    }
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								}
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