php SHA1withRSA算法签名

    public function getSign($data,$key){
        foreach ($data as $k => $v)
        {
            $Parameters[$k] = $v;
        }
        //签名步骤一：按字典序排序参数
        ksort($Parameters);
        $data = $this->formatBizQueryParaMap($Parameters, false);

        $sign = $this->SHA1withRSA($data,$key); 
        // //签名步骤二：在string后加入KEY
        // $String = $String."&key=".$key;
        // //签名步骤三：MD5加密
        // $String = md5($String);
        // //签名步骤四：所有字符转为大写
        // $result = strtoupper($String);
        return $sign;      
    }
    public function SHA1withRSA($data,$key){
        $certs = array();
        openssl_pkcs12_read(file_get_contents($key), $certs, "1106@123"); //其中1106@123为你的证书密码

        if(!$certs) return ;
        $signature = '';  
        openssl_sign($data, $signature, $certs['pkey']);
        return base64_encode($signature);  
    }