使用PHP实现RSA或RSA2算法的签名和验签

class RSA
{
    /**
     * RSA签名
     * @param $data 待签名数据
     * @param $private_key 私钥字符串
     * return 签名结果
     */
    function rsaSign($data, $private_key,$sign_type='OPENSSL_ALGO_SHA1') {

            $search = [
                    "-----BEGIN RSA PRIVATE KEY-----",
                    "-----END RSA PRIVATE KEY-----",
                    "\n",
                    "\r",
                    "\r\n"
            ];

            $private_key=str_replace($search,"",$private_key);
            $private_key=$search[0] . PHP_EOL . wordwrap($private_key, 64, "\n", true) . PHP_EOL . $search[1];
            $res=openssl_get_privatekey($private_key);

            if($res)
            {
                    openssl_sign($data, $sign,$res,$sign_type);
                    openssl_free_key($res);
            }else {
                    exit("私钥格式有误");
            }
            $sign = base64_encode($sign);
            return $sign;
    }

    /**
     * RSA验签
     * @param $data 待签名数据
     * @param $public_key 公钥字符串
     * @param $sign 要校对的的签名结果
     * return 验证结果
     */
    function rsaCheck($data, $public_key, $sign,$sign_type='OPENSSL_ALGO_SHA1')  {
            $search = [
                    "-----BEGIN PUBLIC KEY-----",
                    "-----END PUBLIC KEY-----",
                    "\n",
                    "\r",
                    "\r\n"
            ];
            $public_key=str_replace($search,"",$public_key);
            $public_key=$search[0] . PHP_EOL . wordwrap($public_key, 64, "\n", true) . PHP_EOL . $search[1];
            $res=openssl_get_publickey($public_key);
            if($res)
            {
                    $result = (bool)openssl_verify($data, base64_decode($sign), $res);
                    openssl_free_key($res);
            }else{
                    exit("公钥格式有误!");
            }
            return $result;
    }

}

$str = '11223344';

echo '待签名的数据是' . $str . '<hr>';

$obj = new RSA();
//
$sign = $obj->rsaSign($str,file_get_contents('./private.txt'));

echo '签名后的数据是' . $sign . '<hr>';

if($obj->rsaCheck($str,file_get_contents('./public.txt'),$sign)){
    echo '验证成功';
}else{
    echo '验证失败';
}

//签名 RSA2
openssl_sign($data, $sign,$res,OPENSSL_ALGO_SHA256);

//验签 RSA2
openssl_verify($data, base64_decode($sign), $res,OPENSSL_ALGO_SHA256);