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分享微信支付v3版 php解密解密代码

藏色散人

Jul 15, 2021 pm 01:50 PM

微信支付V3版本小程序支付 php签名,验签,数据解密代码分享

微信支付v3版 php解密解密代码

数据解密需要用到sodium扩展大部分php版本需要安装

证书序列号可以在这里查看https://myssl.com/cert_decode.html

我用的php7.4版本

直接上代码:

//微信原生支付
class Wxpay
{
    /*
     * 支付(小程序支付)
     * @param type $sn        订单编号
     * @param type $money  金额
     * @param type $openid  用户小程序openid
     * @return type
     */
    public static function getPayParam($sn, $money, $openid)
    {
        $url = &#39;https://api.mch.weixin.qq.com/v3/pay/transactions/jsapi&#39;;
        $notify_url = url(&#39;/api/weixin/notify&#39;);
        $data = [];
        $data[&#39;appid&#39;] = Action::config(CONFIG_WXXCX, &#39;app_id&#39;);
        $data[&#39;mchid&#39;] = Action::config(CONFIG_WXXCX, &#39;mchid&#39;); //商户号
        $data[&#39;description&#39;] = &#39;xxx&#39;; //描述？
        $data[&#39;out_trade_no&#39;] = $sn; //商户系统内部订单号
        $data[&#39;time_expire&#39;] = date(&#39;Y-m-d&#39;) . &#39;T&#39; . date(&#39;H:i:s&#39;, (time() + 1800)) . &#39;+08:00&#39;; //订单失效时间2018-06-08T10:34:56+08:00
        $data[&#39;notify_url&#39;] = $notify_url; //异步通知接口地址
        $data[&#39;amount&#39;] = [&#39;total&#39; => $money * 100, &#39;currency&#39; => &#39;CNY&#39;]; //金额
        $data[&#39;payer&#39;] = [&#39;openid&#39; => $openid]; //用户
        $re = self::wxCurl($url, $data, &#39;POST&#39;);
        if (!isset($re[&#39;prepay_id&#39;])) {
            api_fail(&#39;参数获取失败&#39;);
        }
        $result = [];
        $result[&#39;appId&#39;] = Action::config(CONFIG_WXXCX, &#39;app_id&#39;);
        $result[&#39;timeStamp&#39;] = (string)time();
        $result[&#39;nonceStr&#39;] = uniqid();
        $result[&#39;package&#39;] = &#39;prepay_id=&#39; . $re[&#39;prepay_id&#39;];
        $result[&#39;signType&#39;] = &#39;RSA&#39;;
        $result[&#39;paySign&#39;] = self::getPaySign($result);
        return $result;
    }
    /**
     * 查询订单
     * @param type $sn
     */
    public static function select($sn, $return = false)
    {
        $mchid = Action::config(CONFIG_WXXCX, &#39;mchid&#39;); //商户号
        $url = &#39;https://api.mch.weixin.qq.com/v3/pay/transactions/out-trade-no/&#39; . $sn . &#39;?mchid=&#39; . $mchid;
        $re = self::wxCurl($url, [], &#39;GET&#39;);
        if ($return) {
            return $re;
        }
        if (isset($re[&#39;trade_state&#39;]) && $re[&#39;trade_state&#39;] == &#39;SUCCESS&#39;) {
            return true;
        }
        return false;
    }
    /**
     * 关闭订单
     * @param type $sn
     */
    public static function close($sn)
    {
        $mchid = Action::config(CONFIG_WXXCX, &#39;mchid&#39;); //商户号
        $url = &#39;https://api.mch.weixin.qq.com/v3/pay/transactions/out-trade-no/&#39; . $sn . &#39;/close&#39;;
        $re = self::wxCurl($url, [&#39;mchid&#39;=>$mchid], &#39;POST&#39;);
        return true;
    }
    /**
     * 退款
     * @param type $sn
     */
    public static function refund($order_sn,$refund_sn,$total,$refund,$msg=&#39;退款&#39;)
    {
        $url=&#39;https://api.mch.weixin.qq.com/v3/refund/domestic/refunds&#39;;
        $data=[];
        $data[&#39;notify_url&#39;]=url(&#39;ag/weixin/notify_refund&#39;);
        $data[&#39;out_trade_no&#39;]=$order_sn;//订单号
        $data[&#39;out_refund_no&#39;]=$refund_sn;//退款单号
        $data[&#39;reason&#39;]=$msg;
        $data[&#39;amount&#39;]=[&#39;refund&#39;=>$refund*100,&#39;total&#39;=>$total*100,&#39;currency&#39;=>&#39;CNY&#39;];
        $re = self::wxCurl($url, $data, &#39;POST&#39;);
        return $re;
    }
    //请求
    public static function wxCurl($url, $data = [], $method = &#39;GET&#39;)
    {
        $Authorization = self::getReSign($url, $data, $method);
        $header = [
            &#39;Content-Type: application/json&#39;,
            &#39;Accept: application/json&#39;,
            &#39;User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.90 Safari/537.36 Edg/89.0.774.63&#39;,
            &#39;Authorization: &#39; . $Authorization
        ];
        $redata = $data ? json_encode($data) : &#39;&#39;;
        $res = reCurl($url, $redata, $header);
        return $res ? json_decode($res, true) : [];
    }
    //后端请求签名
    public static function getReSign($url, $data, $method = &#39;GET&#39;)
    {
        $url_parts = parse_url($url);
        $canonical_url = ($url_parts[&#39;path&#39;] . (!empty($url_parts[&#39;query&#39;]) ? "?${url_parts[&#39;query&#39;]}" : ""));
        $http_method = $method;
        $timestamp = time();
        $nonce = uniqid();
        $body = $data ? json_encode($data) : &#39;&#39;;
        $mchid = Action::config(CONFIG_WXXCX, &#39;mchid&#39;); //商户id
        $serial_no = Action::config(CONFIG_WXXCX, &#39;serial_no&#39;); //证书编号
        $private_key = self::getPrivateKey(BASE_PATH . &#39;cert/apiclient_key.pem&#39;); //商户私钥
        $message = $http_method . "\n" .
            $canonical_url . "\n" .
            $timestamp . "\n" .
            $nonce . "\n" .
            $body . "\n";
        openssl_sign($message, $raw_sign, $private_key, &#39;sha256WithRSAEncryption&#39;);
        $sign = base64_encode($raw_sign);
        $token = sprintf(&#39;mchid="%s",nonce_str="%s",timestamp="%d",serial_no="%s",signature="%s"&#39;, $mchid, $nonce, $timestamp, $serial_no, $sign);
        return &#39;WECHATPAY2-SHA256-RSA2048 &#39; . $token;
    }
    //前端小程序签名
    public static function getPaySign($result)
    {
        $private_key = self::getPrivateKey(BASE_PATH . &#39;cert/apiclient_key.pem&#39;); //商户私钥
        $message = $result[&#39;appId&#39;] . "\n" .
            $result[&#39;timeStamp&#39;] . "\n" .
            $result[&#39;nonceStr&#39;] . "\n" .
            $result[&#39;package&#39;] . "\n";
        openssl_sign($message, $raw_sign, $private_key, &#39;sha256WithRSAEncryption&#39;);
        $sign = base64_encode($raw_sign);
        return $sign;
    }
    //验证签名
    public static function checkSign()
    {
        $header = Context::get(&#39;header&#39;);
        $serial_no = $header[&#39;wechatpay-serial&#39;] ?? &#39;&#39;; //微信平台序列号
        $timeStamp = $header[&#39;wechatpay-timestamp&#39;] ?? &#39;&#39;;
        $nonce = $header[&#39;wechatpay-nonce&#39;] ?? &#39;&#39;;
        $body = Context::get(&#39;raw&#39;);
        $wx_sign = $header[&#39;wechatpay-signature&#39;] ?? &#39;&#39;;
        $wx_serial_no = Action::config(CONFIG_WXXCX, &#39;wx_serial_no&#39;);//保存的序列号
        if (!$serial_no || $wx_serial_no != $serial_no) {
            \sff\Log::write(&#39;签名过期&#39;);
            return false;
        }
        $message = $timeStamp . "\n" .
            $nonce . "\n" .
            $body . "\n";
        
        $wx_sign = base64_decode($wx_sign);
        $public_key = self::getPublicKey(BASE_PATH . &#39;cert/wx_public_cert.pem&#39;); //平台公钥
        $res = openssl_verify($message, $wx_sign, $public_key, OPENSSL_ALGO_SHA256);
        if ($res == 1) {
            return true;
        }
        \sff\Log::write(&#39;验签失败&#39;);
        return false;
    }
    //获取私钥
    public static function getPrivateKey($filepath)
    {
        return openssl_get_privatekey(file_get_contents($filepath));
    }
    //获取公钥
    public static function getPublicKey($filepath)
    {
        return openssl_pkey_get_public(file_get_contents($filepath));
    }
    //加密数据
    public static function getEncrypt($str)
    {
//$str是待加密字符串 
        $public_key_path = BASE_PATH . &#39;cert/wx_public_cert.pem&#39;; //&#39;平台证书路径&#39;;
        $public_key = file_get_contents($public_key_path);
        $encrypted = &#39;&#39;;
        if (openssl_public_encrypt($str, $encrypted, $public_key, OPENSSL_PKCS1_OAEP_PADDING)) {
            //base64编码 
            $sign = base64_encode($encrypted);
        } else {
            throw new Exception(&#39;encrypt failed&#39;);
        }
        return $sign;
    }
    //解密数据
    public static function decryptToString($ciphertext, $associatedData, $nonceStr)
    {
        $aesKey = Action::config(CONFIG_WXXCX, &#39;mch_keyv3&#39;); //商户apiv3密钥解密
        $str = base64_decode($ciphertext);
        if (strlen($str) <= 16) {
            return &#39;&#39;;
        }
        // ext-sodium (default installed on >= PHP 7.2)
        return \sodium_crypto_aead_aes256gcm_decrypt($str, $associatedData, $nonceStr, $aesKey);
    }
    //下载平台证书
    public static function downCert()
    {
        $url = &#39;https://api.mch.weixin.qq.com/v3/certificates&#39;;
        $re = self::wxCurl($url, [], &#39;GET&#39;);
        if (!isset($re[&#39;data&#39;])) {
            api_fail(&#39;获取证书失败&#39;);
        }
        $ciphertext = $re[&#39;data&#39;][0][&#39;encrypt_certificate&#39;][&#39;ciphertext&#39;];
        $associatedData = $re[&#39;data&#39;][0][&#39;encrypt_certificate&#39;][&#39;associated_data&#39;];
        $nonceStr = $re[&#39;data&#39;][0][&#39;encrypt_certificate&#39;][&#39;nonce&#39;];
        $data = self::decryptToString($ciphertext, $associatedData, $nonceStr);
        if (!$data) {
            api_fail(&#39;获取证书解密失败&#39;);
        }
        file_put_contents(BASE_PATH . &#39;/cert/wx_public_cert.pem&#39;, $data);
        return $data;
    }
}

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