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
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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 = '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($str) <= 16) {
return '';
}
// ext-sodium (default installed on >= PHP 7.2)
return \sodium_crypto_aead_aes256gcm_decrypt($str, $associatedData, $nonceStr, $aesKey);
}
//下载平台证书
public static function downCert()
{
$url = 'https://api.mch.weixin.qq.com/v3/certificates';
$re = self::wxCurl($url, [], 'GET');
if (!isset($re['data'])) {
api_fail('获取证书失败');
}
$ciphertext = $re['data'][0]['encrypt_certificate']['ciphertext'];
$associatedData = $re['data'][0]['encrypt_certificate']['associated_data'];
$nonceStr = $re['data'][0]['encrypt_certificate']['nonce'];
$data = self::decryptToString($ciphertext, $associatedData, $nonceStr);
if (!$data) {
api_fail('获取证书解密失败');
}
file_put_contents(BASE_PATH . '/cert/wx_public_cert.pem', $data);
return $data;
}
} 
