ras 加解密类，支持截取

class RsaEncrypt
{
    private $_privateKey = false;
 private $_publicKey = false;
 /**
 * 私钥解密
 * @param $data 需解密的数据
 * @return string 解密后的数据
 */

 public function __construct()
 {
 //header('Content-Type:text/html;charset=utf-8');
 }

 /**
 * @param $content
 * @return string
 * 解析字符串
 */
 public function decryptByPrivate($content){
 $rsa_bit = 2048;
 $one = $rsa_bit/8;
 $encrypted = hex2bin($content);
 $decrytped = '';
 $num = ceil(strlen($encrypted) / $one);
 for($i = 0; $i < $num; $i++){
 $data_part = substr($encrypted,$i * $one,$one);
 $de = '';
 if(openssl_private_decrypt($data_part,$de,$this->getPrivateKey())){
 $decrytped .=$de;
 }else{
 print_r(openssl_error_string());exit;
 };
 }
 return $decrytped;
 }

 /**
 * 公钥解密
 ** @param $data 需解密的数据
 * @return string 解密后的数据
 */
 public function decryptByPublic($data){
 $decrypted = '';
 openssl_public_decrypt($data,$decrypted,$this->getPublicKey());
 openssl_free_key($this->_publicKey);
 return $decrypted;
 }

 /**
 * 银联公钥解密
 ** @param $data 需解密的数据
 * @return string 解密后的数据
 */
 public function decryptByYinlianPublic($data){
 $decrypted = '';
 openssl_public_decrypt($data,$decrypted,$this->getYinlianPublicKey());
 return $decrypted;
 }
 
 
 
 
 
 
 /**
 * 私钥加密
 * @param $data 需加密的数据
 * @return string 加密后的数据
 */
 public function encryptionByPrivate($data){
 $crypto = '';
 $data = json_encode($data);
 foreach (str_split($data, 117) as $chunk) {
 openssl_private_encrypt($chunk, $encryptData, $this->getPrivateKey());
 $crypto .= $encryptData;
 }
 openssl_free_key($this->_privateKey);
 return bin2hex($crypto);

 }

 /**
 * 公钥加密
 * @param $data 需加密的数据
 * @return string 加密后的数据
 */
 public function encryptionByPublic($data){
 $crypto = '';
 $data = json_encode($data);
 foreach (str_split($data, 117) as $chunk) {
 openssl_public_encrypt($chunk,$encryptData, $this->getPublicKey());
 $crypto .= $encryptData;
 }
 return bin2hex($crypto);
 }

 public function encryptionByYinlianPublic($data){
 $crypto = '';
 $data = json_encode($data);
 foreach (str_split($data, 117) as $chunk) {
 openssl_public_encrypt($chunk, $encryptData, $this->getYinlianPublicKey());
 $crypto .= $encryptData;
 }
 return bin2hex($crypto);

 }

 /**
 * 获取私钥文件数据
 * @return bool|resource
 */
 private function getPrivateKey(){
 if($this->_privateKey == false ){
 $key = file_get_contents(dirname(__FILE__) . '/pem/private_key.pem');
 $this->_privateKey = openssl_pkey_get_private($key);
 }
 return $this->_privateKey;
 }

 /**
 * 获取公钥文件数据
* @return bool|resource
 */
private function getPublicKey(){
if($this->_publicKey == false){
$key = file_get_contents(dirname(__FILE__) . '/pem/public_key.pem');
$this->_publicKey = openssl_pkey_get_public($key);
}
return $this->_publicKey;
}

/**
 * 获取银联公钥
* @return resource
 */
private function getYinlianPublicKey(){
$key = file_get_contents((dirname(__FILE__).'/pem/yinlian_public_key.pem'));
$public_key = openssl_pkey_get_public($key);
return $public_key;
}


public function sign($data){
$method = 'SHA256';
openssl_sign($data,$sign,$this->getPrivateKey(),$method);
return $sign;
}

/**
 * 验签
* @param $content
 * @return mixed
 */
public function verify($content){
$method = 'SHA256';
if(!openssl_verify($data,$content, $content,$this->getPublicKey(),$method)){
$error = openssl_error_string();
var_dump($error);
}else{
 var_dump($data);
}
return $data;
}
}