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支付宝某些业务只能使用公钥证书方式来验签
如：即使转账
红包等
笔者就要实现这样一个功能，【单笔转账到支付宝账户】，采用支付宝公钥证书签名来实现。
话不多说，流程先走起
第一步：下载支付宝秘钥生成器
由于我们使用的是php鱼油，点击pkcs1（非java适用）
按照上面图中的 三个步骤操作，操作完成后，点击【打开文件位置】，可以看到下面这些文件
会有
- 一个csr文件
- 一个公钥
- 一个私钥
我们将csr文件上传到支付宝 接口加签方式 里面，然后讲下图里面的三个整数下载下来
分别是：
- alipayCertPublicKey_RSA2.crt
- alipayRootCert.crt
- appCertPublicKey_202100000023232.crt
第二步，配置PHP配置
我们将 上面生成的三个文件复制到证书目录，如图：
配置代码如下：
<?php
return ['app_id' => '', // 支付宝应用的appid'alipay_root_cert_sn' => BASE_PATH . '/cert/alipayRootCert.crt', // 支付宝根证书在自己服务器的绝对路径'app_cert_sn' => BASE_PATH . '/cert/appCertPublicKey_2021000199651454.crt', // 应用公钥证书在自己服务器绝对路径'rsa_private_key' => '' // 这个是RSA签名，特别要注意的是，是我们第一步中的对应自己域名的那个私钥哦
];
编写AlipayTransServer
class AlipayTransfers
{protected $appId;//私钥值protected $rsaPrivateKey;/*** @var string*/private $charset;public function __construct($appid, $saPrivateKey){$this->appId = $appid;$this->charset = 'utf8';$this->rsaPrivateKey = $saPrivateKey;}/*** 转帐* @param float $totalFee 转账金额，单位：元。* @param string $outTradeNo 商户转账唯一订单号* @param string $remark 转帐备注* @return array*/public function doPay($totalFee, $outTradeNo, $account, $realName, $remark = ''){//请求参数$requestConfigs = array('out_biz_no' => $outTradeNo,'payee_type' => 'ALIPAY_LOGONID','payee_account' => $account,'payee_real_name' => $realName, //收款方真实姓名'amount' => $totalFee, //转账金额，单位：元。'remark' => $remark, //转账备注（选填）);$commonConfigs = array(//公共参数'app_id' => $this->appId,'method' => 'alipay.fund.trans.toaccount.transfer', //接口名称'format' => 'JSON','charset' => $this->charset,'sign_type' => 'RSA2','timestamp' => date('Y-m-d H:i:s'),'alipay_root_cert_sn' => $this->getRootCertSN(BASE_PATH . '/cert/alipayRootCert.crt'),//支付宝根证书SN（alipay_root_cert_sn）'app_cert_sn' => $this->getCertSN(BASE_PATH . '/cert/appCertPublicKey_2021000199651454.crt'), //应用公钥证书SN（app_cert_sn）'version' => '1.0','biz_content' => json_encode($requestConfigs),);$commonConfigs["sign"] = $this->generateSign($commonConfigs, $commonConfigs['sign_type']);$result = $this->curlPost('https://openapi.alipay.com/gateway.do', $commonConfigs);$resultArr = json_decode($result, true);if (empty($resultArr)) {$result = iconv('GBK', 'UTF-8//IGNORE', $result);return json_decode($result, true);}return $resultArr;}public function generateSign($params, $signType = "RSA"){return $this->sign($this->getSignContent($params), $signType);}protected function sign($data, $signType = "RSA"){$priKey = $this->rsaPrivateKey;$res = "-----BEGIN RSA PRIVATE KEY-----\n" .wordwrap($priKey, 64, "\n", true) ."\n-----END RSA PRIVATE KEY-----";($res) or die('您使用的私钥格式错误，请检查RSA私钥配置');if ("RSA2" == $signType) {openssl_sign($data, $sign, $res, version_compare(PHP_VERSION, '5.4.0', '<') ? SHA256 : OPENSSL_ALGO_SHA256); //OPENSSL_ALGO_SHA256是php5.4.8以上版本才支持} else {openssl_sign($data, $sign, $res);}$sign = base64_encode($sign);return $sign;}/*** 校验$value是否非空* if not set ,return true;* if is null , return true;**/protected function checkEmpty($value){if (!isset($value))return true;if ($value === null)return true;if (trim($value) === "")return true;return false;}public function getSignContent($params){ksort($params);$stringToBeSigned = "";$i = 0;foreach ($params as $k => $v) {if (false === $this->checkEmpty($v) && "@" != substr($v, 0, 1)) {// 转换成目标字符集$v = $this->characet($v, $this->charset);if ($i == 0) {$stringToBeSigned .= "$k" . "=" . "$v";} else {$stringToBeSigned .= "&" . "$k" . "=" . "$v";}$i++;}}unset ($k, $v);return $stringToBeSigned;}/*** 转换字符集编码* @param $data* @param $targetCharset* @return string*/function characet($data, $targetCharset){if (!empty($data)) {$fileType = $this->charset;if (strcasecmp($fileType, $targetCharset) != 0) {$data = mb_convert_encoding($data, $targetCharset, $fileType);}}return $data;}public function curlPost($url = '', $postData = '', $options = array()){if (is_array($postData)) {$url = $url . '?' . http_build_query($postData);cli_log($url);}$ch = curl_init();curl_setopt($ch, CURLOPT_URL, $url);curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);curl_setopt($ch, CURLOPT_TIMEOUT, 30); //设置cURL允许执行的最长秒数if (!empty($options)) {curl_setopt_array($ch, $options);}//https请求 不验证证书和hostcurl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);$data = curl_exec($ch);curl_close($ch);return $data;}/*** 从证书中提取**** @param $cert* @return string*/public function getCertSN($certPath){$cert = file_get_contents($certPath);$ssl = openssl_x509_parse($cert);$SN = md5($this->array2string(array_reverse($ssl['issuer'])) . $ssl['serialNumber']);return $SN;}/*** 提取根证书**** @param $cert 根证书* @return string|null*/public function getRootCertSN($certPath){$cert = file_get_contents($certPath);$array = explode("-----END CERTIFICATE-----", $cert);$SN = null;for ($i = 0; $i < count($array) - 1; $i++) {$ssl[$i] = openssl_x509_parse($array[$i] . "-----END CERTIFICATE-----");if (strpos($ssl[$i]['serialNumber'], '0x') === 0) {$ssl[$i]['serialNumber'] = $this->hex2dec($ssl[$i]['serialNumber']);}if ($ssl[$i]['signatureTypeLN'] == "sha1WithRSAEncryption" || $ssl[$i]['signatureTypeLN'] == "sha256WithRSAEncryption") {if ($SN == null) {$SN = md5($this->array2string(array_reverse($ssl[$i]['issuer'])) . $ssl[$i]['serialNumber']);} else {$SN = $SN . "_" . md5($this->array2string(array_reverse($ssl[$i]['issuer'])) . $ssl[$i]['serialNumber']);}}}return $SN;}/*** 0x转高精度数字* @param $hex* @return int|string*/protected function hex2dec($hex){$dec = 0;$len = strlen($hex);for ($i = 1; $i <= $len; $i++) {$dec = bcadd($dec, bcmul(strval(hexdec($hex[$i - 1])), bcpow('16', strval($len - $i))));}return $dec;}protected function array2string($array){$string = [];if ($array && is_array($array)) {foreach ($array as $key => $value) {$string[] = $key . '=' . $value;}}return implode(',', $string);}
}实现业务部分：
/*** 转账提现* @param $realName 收款人真实姓名* @param $account 收款人账号* @param $amount 付款金额* @param string $remark 付款备注* @return array|void*/public function transfer($realName, $account, $amount, $remark = '提现'){$aliConfig = config('alipay');$aliTransfers = new Transfers($aliConfig['app_id'], $aliConfig['rsa_private_key']);$outTradeNo = date('Ymd') . time() . rand_string(6, true);return $aliTransfers->doPay($amount, $outTradeNo, $account, $realName, $remark);}