/**
* 获取sha256签名 php
* @param string $sign_str 签名串
*
* @return string
*/
public function get_sign_sha256_rsa($sign_str="")
{
// echo "<pre>";
// var_dump($sign_str);
// die;
// echo "</pre>";
// SHA256 with RSA
//使用商户私钥对摘要信息进行 RSA 签名(签名类型为 SHA256),得到二进制的签名值
$private_key = file_get_contents("./cert/apiclient_key.pem"); //证书内容格式不对
// echo "<pre>";
// var_dump($private_key);
// die;
// echo "</pre>";
$binary_signature = "";
$priv_key_id = openssl_pkey_get_private($private_key); //获取私钥
openssl_sign($sign_str, $binary_signature, $priv_key_id, OPENSSL_ALGO_SHA256);
$sign = base64_encode($binary_signature);
return $sign;
}
https://wechatpay-api.gitbook.io/wechatpay-api-v3/ren-zheng/qian-ming-he-zheng-shu