php7以上 不支持mcrypt_module_open方法問題【微信開放平台】

轉發鏈接：

https://blog.csdn.net/zchare/article/details/81234942?utm_medium=distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-2.channel_param&depth_1-utm_source=distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-2.channel_param

 

由於做微信第三方平台，加密解密處理時 mcrypt_module_open()函數在7.1中被貶低，將在7.2中被移除，要用openssl_decrypt()函數代替。廢話不多說了。直接給代碼

對明文加密：

原代碼

//獲得16位隨機字符串，填充到明文之前
$random = $this->getRandomStr();
$text = $random . pack("N", strlen($text)) . $text . $appid;
// 網絡字節序
$size = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC);
$module = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, '');
$iv = substr($this->key, 0, 16);
//使用自定義的填充方式對明文進行補位填充
$pkc_encoder = new PKCS7Encoder;
$text = $pkc_encoder->encode($text);
mcrypt_generic_init($module, $this->key, $iv);
//加密
$encrypted = mcrypt_generic($module, $text);
mcrypt_generic_deinit($module);
mcrypt_module_close($module);

修改為

$random = $this->getRandomStr();
$text = $random . pack("N", strlen($text)) . $text . $appid;
$iv = substr($this->key, 0, 16);
$pkc_encoder = new PKCS7Encoder;
$text = $pkc_encoder->encode($text);
$encrypted = openssl_encrypt($text, 'AES-256-CBC', $this->key, OPENSSL_RAW_DATA|OPENSSL_ZERO_PADDING, $iv);

對密文解密：

原代碼

//使用BASE64對需要解密的字符串進行解碼
$ciphertext_dec = base64_decode($encrypted);
$module = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, '');
$iv = substr($this->key, 0, 16);
mcrypt_generic_init($module, $this->key, $iv);
 
//解密
$decrypted = mdecrypt_generic($module, $ciphertext_dec);
mcrypt_generic_deinit($module);
mcrypt_module_close($module);

修改為

$ciphertext_dec = base64_decode($encrypted);
$iv = substr($this->key, 0, 16);
$decrypted = openssl_decrypt($ciphertext_dec, 'AES-256-CBC', $this->key, OPENSSL_RAW_DATA|OPENSSL_ZERO_PADDING, $iv);