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;
}
}