php jwt 算法

<?php
class JwtBase {
    //头部
    private static $header=array(
        'alg'=>'HS256', //生成signature的算法
        'typ'=>'JWT'  //类型
    );
    //使用HMAC生成信息摘要时所使用的密钥
    private static $key='zhouein';

    /**
     * 获取jwt token
     * @return bool|string
     */
    public static function getToken(array $payload)
    {
        $arr = [
            'iss'=>'yamecent', //该JWT的签发者
            'iat'=>time(), //签发时间
            'exp'=>time()+3600*24*15, //过期时间
            'nbf'=>time(), //该时间之前不接收处理该Token
            'sub'=>'', //面向的用户
            'jti'=>md5(uniqid('JWT').time()) //该Token唯一标识
        ];
        $payload = array_merge($arr,$payload);
        if(is_array($payload))
        {
            $base64header=self::base64UrlEncode(json_encode(self::$header,JSON_UNESCAPED_UNICODE));
            $base64payload=self::base64UrlEncode(json_encode($payload,JSON_UNESCAPED_UNICODE));
            $token=$base64header.'.'.$base64payload.'.'.self::signature($base64header.'.'.$base64payload,self::$key,self::$header['alg']);
            return $token;
        }else{
            return false;
        }
    }

    /**
     * 验证token是否有效,默认验证exp,nbf,iat时间
     * @param string $Token 需要验证的token
     * @return bool|string
     */
    public static function verifyToken($Token)
    {
        $tokens = explode('.', $Token);
        if (count($tokens) != 3)
            return false;

        list($base64header, $base64payload, $sign) = $tokens;

        //获取jwt算法
        $base64decodeheader = json_decode(self::base64UrlDecode($base64header), JSON_OBJECT_AS_ARRAY);
        echo "验证码为:".self::signature($base64header . '.' . $base64payload, self::$key, $base64decodeheader['alg']);
            ECHO "<BR>";
            echo "你输入的验证码为:".$sign;
        if (empty($base64decodeheader['alg']))
            return false;

        //签名验证
        if (self::signature($base64header . '.' . $base64payload, self::$key, $base64decodeheader['alg']) !== $sign)
            return false;

        $payload = json_decode(self::base64UrlDecode($base64payload), JSON_OBJECT_AS_ARRAY);

        //签发时间大于当前服务器时间验证失败
        if (isset($payload['iat']) && $payload['iat'] > time())
            return false;

        //过期时间小宇当前服务器时间验证失败
        if (isset($payload['exp']) && $payload['exp'] < time())
            return false;

        //该nbf时间之前不接收处理该Token
        if (isset($payload['nbf']) && $payload['nbf'] > time())
            return false;

        return $payload;
    }

    /**
     * base64UrlEncode  https://jwt.io/ 中base64UrlEncode编码实现
     * @param string $input 需要编码的字符串
     * @return string
     */
    private static function base64UrlEncode($input)
    {
        return str_replace('=', '', strtr(base64_encode($input), '+/', '-_'));
    }

    /**
     * base64UrlEncode https://jwt.io/ 中base64UrlEncode解码实现
     * @param string $input 需要解码的字符串
     * @return bool|string
     */
    private static function base64UrlDecode($input)
    {
        $remainder = strlen($input) % 4;
        if ($remainder) {
            $addlen = 4 - $remainder;
            $input .= str_repeat('=', $addlen);
        }
        return base64_decode(strtr($input, '-_', '+/'));
    }

    /**
     * HMACSHA256签名  https://jwt.io/ 中HMACSHA256签名实现
     * @param string $input 为base64UrlEncode(header).".".base64UrlEncode(payload)
     * @param string $key
     * @param string $alg  算法方式
     * @return mixed
     */
    private static function signature($input, $key, $alg = 'HS256')
    {
        $alg_config=array(
            'HS256'=>'sha256'
        );
        return self::base64UrlEncode(hash_hmac($alg_config[$alg], $input, $key,true));
    }
}
//////////////////////////////1.生成token////////////
$token_a = JwtBase::getToken(['user_id'=>'0000']);
echo $token_a;
echo "<br>";
//////////////////////////////2.生成token////////////
$payload    = array(
  "password"=> "128DEdddddd",
  "device_id"=> "790e5476-66eb-47f6-906b-206f81d71f52",
  "scope"=> "msso onstar mag_subscriber mag_visitor",
  "grant_type"=> "password",
  "username"=> "1533ddddddd",
  "timestamp"=> "2021-08-20T02:34:07.276Z",
  "client_id"=> "ONSTAR_CHINA_MOBILE_AND_80",
  "nonce"=> "17b2d6c0-f180-11eb-b486-bd377c2a82c6",
  "assertion"=> null 
    );
$jwt=new JwtBase();
$token_b=$jwt->getToken($payload);
//$token = $Jwt->getToken(['user_id'=>'111']);
echo $token_b;
//////////////////////1.验证//////////////////////
$data_a = JwtBase::verifyToken('eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.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.jL_HSfiBDzw4F0jEgRKs04eIBrvqpUQuhPWR3M0lzGY验证码为:-E_8YsLTcrzWOu9_XYRTGTyLEmjer6-lBbHhJbJXJWc');
var_dump($data_a);
//////////////////////2.验证//////////////////////
$data_b = $jwt->verifyToken($token_b);
var_dump($data_b);