在PHP中，我必须使用ARUBA作为CA通过HTTP（RFC 3161）使用时间戳协议对文档进行签名。
阿鲁巴的文件说：
要为基准添加时间戳，必须调用 url https://servizi.arubapec.it/tsa/ngrequest.php 使用 POST 方法。在 POST 正文中，您必须插入结构 TimeStampReq （RFC 3161） 在 DER 中编码。
如何使用 php 发出请求？
你可以在php中使用curl函数。
好的，这是我编辑/修改的tcpdf.php的一部分。
//Send request to TSA Server with Curl
if(extension_loaded('curl')) {
$hdaLog .= "'nCurl was already Loaded'nCurl is sending tsRequest to '"".$this->timestamp_url."'"";
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $this->timestamp_url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_USERAGENT, '1');
curl_setopt($ch, CURLOPT_POSTFIELDS, $raw_data);
$tsResponse = curl_exec($ch);
if($tsResponse != false) {
$hdaLog .= "'ntsRequest is sent";
} else {
hdaLog("$hdaLog'ncan't send tsRequest, Timestamp failed",'w');
}
//parse ts response
$hexTs = bin2hex($tsResponse);
$tsparse = asn1parse($hexTs);
$tsparse0 = asn1parse($tsparse[0][1]);
if(count($tsparse0 > 1)) { //Remove response status data, only take timeStampToken
$timeStamp = seq($tsparse0[1][1]);
} else {
$timeStamp = seq($tsparse0[0][1]);
}
//Add timestamp to TCPDF Signature
$timeStamp = seq("060B2A864886F70D010910020E".set($timeStamp));
$pkcs7 = int($pa1[0][1]).seq($pa1[1][1]).seq($pa1[2][1]).explicit(0, $pa1[3][1]).seq($pa1[4][1]).oct($pa1[5][1]);
$time = seq($pkcs7.explicit(1,$timeStamp));
$aa=seq(int(1). set($p3[1][1]).seq($p3[2][1]).explicit(0, $p3[3][1]).set($time));
$hdaSignature = seq("06092A864886F70D010702".explicit(0,($aa)))."0000";
$signature = $hdaSignature;
hdaLog("$hdaLog'nTimestamp Success");
} else {
$hdaLog .= "'nCurl was not loaded, trying to load it...";
if(@dl('php_curl.dll')) {
$hdaLog .= "'nCurl successfully Loaded";
} else {
hdaLog("$hdaLog'nCurl failed to load timestamping failed", 'w');
}
}