When decoding the applet, the mcrypt extension cannot be used in PHP 7.0 or above. The old version of the decryption solution

The content shared with you in this article is that the mcrypt extension of PHP 7.0 or above cannot use the old version of the decryption solution when decoding the mini program. It has a certain reference value. Friends in need can refer to it

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WXBizDataCrypt.php

class	WXBizDataCrypt	{

				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,	$iv,	&$data)	{
						if	(strlen($this->sessionKey)	!=	24)	{
								return	ErrorCode::$IllegalAesKey;
						}
						$aesKey	=	base64_decode($this->sessionKey);


						if	(strlen($iv)	!=	24)	{
								return	ErrorCode::$IllegalIv;
						}
						$aesIV	=	base64_decode($iv);

						$aesCipher	=	base64_decode($encryptedData);

						$pc	=	new	Prpcrypt($aesKey);
						$result	=	$pc->decrypt($aesCipher,	$aesIV);

						if	($result[0]	!=	0)	{
								return	$result[0];
						}

						$dataObj	=	json_decode($result[1]);
						if	($dataObj	==	NULL)	{
								return	ErrorCode::$IllegalBuffer;
						}
						if	($dataObj->watermark->appid	!=	$this->appid)	{
								return	ErrorCode::$IllegalBuffer;
						}
						$data	=	$result[1];
						return	ErrorCode::$OK;
				}
			// 	// 注释这一段是7.0以上版本
			// public function decryptData( $encryptedData, $iv, &$data )
			//     {
			//         if (strlen($this->sessionKey) != 24) {
			//             return ErrorCode::$IllegalAesKey;
			//         }
			//         $aesKey=base64_decode($this->sessionKey);
			        
			//         if (strlen($iv) != 24) {
			//             return ErrorCode::$IllegalIv;
			//         }
			//         $aesIV=base64_decode($iv);
			//         // $aesCipher=base64_decode($encryptedData);
			//         $aesCipher=$encryptedData;
			//         $pc = new Prpcrypt($aesKey);
			//         $result = $pc->decrypt($aesCipher,$aesIV);
			//      //   var_dump($result);
			//         if ($result[0] != 0) {
			//             return $result[0];
			//         }
			     
			//         $dataObj=json_decode( $result[1] );
			//         if( $dataObj  == NULL )
			//         {
			//             return ErrorCode::$IllegalBuffer.'--';
			//         }
			//         if( $dataObj->watermark->appid != $this->appid )
			//         {
			//             return ErrorCode::$IllegalBuffer.';;';
			//         }
			//         $data = $result[1];
			//         return ErrorCode::$OK;
			//     }

		}

PKCS7Encoder.php

##

		class	PKCS7Encoder	{

				public	static	$block_size	=	16;

				/**
					* 对需要加密的明文进行填充补位
					* @param $text 需要进行填充补位操作的明文
					* @return 补齐明文字符串
					*/
				function	encode($text)	{
						$block_size	=	PKCS7Encoder::$block_size;
						$text_length	=	strlen($text);
						//计算需要填充的位数
						$amount_to_pad	=	PKCS7Encoder::$block_size	-	(	$text_length	%	PKCS7Encoder::$block_size	);
						if	($amount_to_pad	==	0)	{
								$amount_to_pad	=	PKCS7Encoder::block_size;
						}
						//获得补位所用的字符
						$pad_chr	=	chr($amount_to_pad);
						$tmp	=	"";
						for	($index	=	0;	$index	<	$amount_to_pad;	$index++)	{
								$tmp	.=	$pad_chr;
						}
						return	$text	.	$tmp;
				}

				/**
					* 对解密后的明文进行补位删除
					* @param decrypted 解密后的明文
					* @return 删除填充补位后的明文
					*/
				function	decode($text)	{

						$pad	=	ord(substr($text,	-1));
						if	($pad	<	1	||	$pad	>	32)	{
								$pad	=	0;
						}
						return	substr($text,	0,	(strlen($text)	-	$pad));
				}

		}

		/**
			* Prpcrypt class
			*
			* 
			*/
		class	Prpcrypt	{

				public	$key;

				public	function	__construct($k)	{
						$this->key	=	$k;
				}

				/**
					* 对密文进行解密
					* @param string $aesCipher 需要解密的密文
					* @param string $aesIV 解密的初始向量
					* @return string 解密得到的明文
					*/
				public	function	decrypt($aesCipher,	$aesIV)	{

						try	{

								$module	=	mcrypt_module_open(MCRYPT_RIJNDAEL_128,	&#39;&#39;,	MCRYPT_MODE_CBC,	&#39;&#39;);

								mcrypt_generic_init($module,	$this->key,	$aesIV);

								//解密
								$decrypted	=	mdecrypt_generic($module,	$aesCipher);
								mcrypt_generic_deinit($module);
								mcrypt_module_close($module);
						}	catch	(Exception	$e)	{
								return	array(ErrorCode::$IllegalBuffer,	null);
						}


						try	{
								//去除补位字符
								$pkc_encoder	=	new	PKCS7Encoder;
								$result	=	$pkc_encoder->decode($decrypted);
						}	catch	(Exception	$e)	{
								//print $e;
								return	array(ErrorCode::$IllegalBuffer,	null);
						}
						return	array(0,	$result);
				}

                                  //php 7.0版本
				 // public function decrypt( $aesCipher, $aesIV )
				 //    {
				 //        try {
				            
				 //            // $module = mcrypt_module_open(MCRYPT_RIJNDAEL_128, &#39;&#39;, MCRYPT_MODE_CBC, &#39;&#39;);
				            
				 //            // mcrypt_generic_init($module, $this->key, $aesIV);
				 //            // //解密
				 //            // $decrypted = mdecrypt_generic($module, $aesCipher);
				 //            // mcrypt_generic_deinit($module);
				 //            // mcrypt_module_close($module);
				 //            $decrypted = openssl_decrypt($aesCipher,&#39;AES-128-CBC&#39;,$this->key,OPENSSL_ZERO_PADDING,$aesIV);
				 //            // var_dump($decrypted);
				 //        } catch (Exception $e) {
				 //            return array(ErrorCode::$IllegalBuffer, null);
				 //        }
				 //        try {
				 //            //去除补位字符
				 //            $pkc_encoder = new PKCS7Encoder;
				 //            $result = $pkc_encoder->decode($decrypted);
				 //        } catch (Exception $e) {
				 //            //print $e;
				 //            return array(ErrorCode::$IllegalBuffer, null);
				 //        }
				 //        return array(0, $result);
				 //    }

		}

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