Share WeChat payment v3 version php decryption code

WeChat Pay V3 version applet payment php signature, signature verification, data decryption code sharing

WeChat Pay v3 version php decryption code

Required for data decryption Most PHP versions to expand to Sodium need to install

The certificate serial number can be viewed here https://myssl.com/cert_decode.html

The PHP7.4 version I use

Go directly to the code:

//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 = 'https://api.mch.weixin.qq.com/v3/pay/transactions/jsapi';
        $notify_url = url('/api/weixin/notify');
        $data = [];
        $data['appid'] = Action::config(CONFIG_WXXCX, 'app_id');
        $data['mchid'] = Action::config(CONFIG_WXXCX, 'mchid'); //商户号
        $data['description'] = 'xxx'; //描述？
        $data['out_trade_no'] = $sn; //商户系统内部订单号
        $data['time_expire'] = date('Y-m-d') . 'T' . date('H:i:s', (time() + 1800)) . '+08:00'; //订单失效时间2018-06-08T10:34:56+08:00
        $data['notify_url'] = $notify_url; //异步通知接口地址
        $data['amount'] = ['total' => $money * 100, 'currency' => 'CNY']; //金额
        $data['payer'] = ['openid' => $openid]; //用户
        $re = self::wxCurl($url, $data, 'POST');
        if (!isset($re['prepay_id'])) {
            api_fail('参数获取失败');
        }
        $result = [];
        $result['appId'] = Action::config(CONFIG_WXXCX, 'app_id');
        $result['timeStamp'] = (string)time();
        $result['nonceStr'] = uniqid();
        $result['package'] = 'prepay_id=' . $re['prepay_id'];
        $result['signType'] = 'RSA';
        $result['paySign'] = self::getPaySign($result);
        return $result;
    }
    /**
     * 查询订单
     * @param type $sn
     */
    public static function select($sn, $return = false)
    {
        $mchid = Action::config(CONFIG_WXXCX, 'mchid'); //商户号
        $url = 'https://api.mch.weixin.qq.com/v3/pay/transactions/out-trade-no/' . $sn . '?mchid=' . $mchid;
        $re = self::wxCurl($url, [], 'GET');
        if ($return) {
            return $re;
        }
        if (isset($re['trade_state']) && $re['trade_state'] == 'SUCCESS') {
            return true;
        }
        return false;
    }
    /**
     * 关闭订单
     * @param type $sn
     */
    public static function close($sn)
    {
        $mchid = Action::config(CONFIG_WXXCX, 'mchid'); //商户号
        $url = 'https://api.mch.weixin.qq.com/v3/pay/transactions/out-trade-no/' . $sn . '/close';
        $re = self::wxCurl($url, ['mchid'=>$mchid], 'POST');
        return true;
    }
    /**
     * 退款
     * @param type $sn
     */
    public static function refund($order_sn,$refund_sn,$total,$refund,$msg='退款')
    {
        $url='https://api.mch.weixin.qq.com/v3/refund/domestic/refunds';
        $data=[];
        $data['notify_url']=url('ag/weixin/notify_refund');
        $data['out_trade_no']=$order_sn;//订单号
        $data['out_refund_no']=$refund_sn;//退款单号
        $data['reason']=$msg;
        $data['amount']=['refund'=>$refund*100,'total'=>$total*100,'currency'=>'CNY'];
        $re = self::wxCurl($url, $data, 'POST');
        return $re;
    }
    //请求
    public static function wxCurl($url, $data = [], $method = 'GET')
    {
        $Authorization = self::getReSign($url, $data, $method);
        $header = [
            'Content-Type: application/json',
            'Accept: application/json',
            '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',
            'Authorization: ' . $Authorization
        ];
        $redata = $data ? json_encode($data) : '';
        $res = reCurl($url, $redata, $header);
        return $res ? json_decode($res, true) : [];
    }
    //后端请求签名
    public static function getReSign($url, $data, $method = 'GET')
    {
        $url_parts = parse_url($url);
        $canonical_url = ($url_parts['path'] . (!empty($url_parts['query']) ? "?${url_parts['query']}" : ""));
        $http_method = $method;
        $timestamp = time();
        $nonce = uniqid();
        $body = $data ? json_encode($data) : '';
        $mchid = Action::config(CONFIG_WXXCX, 'mchid'); //商户id
        $serial_no = Action::config(CONFIG_WXXCX, 'serial_no'); //证书编号
        $private_key = self::getPrivateKey(BASE_PATH . 'cert/apiclient_key.pem'); //商户私钥
        $message = $http_method . "\n" .
            $canonical_url . "\n" .
            $timestamp . "\n" .
            $nonce . "\n" .
            $body . "\n";
        openssl_sign($message, $raw_sign, $private_key, 'sha256WithRSAEncryption');
        $sign = base64_encode($raw_sign);
        $token = sprintf('mchid="%s",nonce_str="%s",timestamp="%d",serial_no="%s",signature="%s"', $mchid, $nonce, $timestamp, $serial_no, $sign);
        return 'WECHATPAY2-SHA256-RSA2048 ' . $token;
    }
    //前端小程序签名
    public static function getPaySign($result)
    {
        $private_key = self::getPrivateKey(BASE_PATH . 'cert/apiclient_key.pem'); //商户私钥
        $message = $result['appId'] . "\n" .
            $result['timeStamp'] . "\n" .
            $result['nonceStr'] . "\n" .
            $result['package'] . "\n";
        openssl_sign($message, $raw_sign, $private_key, 'sha256WithRSAEncryption');
        $sign = base64_encode($raw_sign);
        return $sign;
    }
    //验证签名
    public static function checkSign()
    {
        $header = Context::get('header');
        $serial_no = $header['wechatpay-serial'] ?? ''; //微信平台序列号
        $timeStamp = $header['wechatpay-timestamp'] ?? '';
        $nonce = $header['wechatpay-nonce'] ?? '';
        $body = Context::get('raw');
        $wx_sign = $header['wechatpay-signature'] ?? '';
        $wx_serial_no = Action::config(CONFIG_WXXCX, 'wx_serial_no');//保存的序列号
        if (!$serial_no || $wx_serial_no != $serial_no) {
            \sff\Log::write('签名过期');
            return false;
        }
        $message = $timeStamp . "\n" .
            $nonce . "\n" .
            $body . "\n";
        
        $wx_sign = base64_decode($wx_sign);
        $public_key = self::getPublicKey(BASE_PATH . 'cert/wx_public_cert.pem'); //平台公钥
        $res = openssl_verify($message, $wx_sign, $public_key, OPENSSL_ALGO_SHA256);
        if ($res == 1) {
            return true;
        }
        \sff\Log::write('验签失败');
        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 . 'cert/wx_public_cert.pem'; //'平台证书路径';
        $public_key = file_get_contents($public_key_path);
        $encrypted = '';
        if (openssl_public_encrypt($str, $encrypted, $public_key, OPENSSL_PKCS1_OAEP_PADDING)) {
            //base64编码 
            $sign = base64_encode($encrypted);
        } else {
            throw new Exception('encrypt failed');
        }
        return $sign;
    }
    //解密数据
    public static function decryptToString($ciphertext, $associatedData, $nonceStr)
    {
        $aesKey = Action::config(CONFIG_WXXCX, 'mch_keyv3'); //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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