openssl_pkcs7_sign(）:文件AppleWWDRCA.cer中没有证书 - openssl_pkcs7_sign(): no certificates in file AppleWWDRCA.cer

openssl_pkcs7_sign(): no certificates in file AppleWWDRCA.cer

我需要创建一个分离的PKCS7签名，以便与Apple Wallet通行证一起使用。

代码

private function createSignature()
{
    $cert = '/etc/ssl/local.crt';
    $key = '/etc/ssl/local.key';
    $wwdr = '/var/www/app/storage/passes/AppleWWDRCA.cer';
    $headers = [
        'signing-time' => (new DateTime())->format('o-m-d H:i:s'),
    ];
    return openssl_pkcs7_sign("$this->dir/manifest.json", "$this->dir/signature",
        $cert, $key, $headers, PKCS7_DETACHED, $wwdr);
}

错误

openssl_pkcs7_sign(): no certificates in file, /var/www/app/storage/passes/AppleWWDRCA.cer

AppleWWDRCA.cer已从下载https://www.apple.com/certificateauthority/.我下载的确切证书是WWDR Certificate (Expiring 02/07/23)。我已经查看了该文件，并确认它不是空白的。我是不是少了一步？

通过将AppleWWDR.cer添加到我的钥匙链中并将其从钥匙链导出为.pem文件，问题得到了解决。