PHP and timestamp protocol - php

Question

In PHP i must sign a document with the Timestamp Protocol via HTTP (RFC 3161) using ARUBA as CA.
The Aruba's documentation says:
To time-stamp a datum you must call the url https://servizi.arubapec.it/tsa/ngrequest.php
with a POST method. In the POST body you must insert the structure TimeStampReq (RFC 3161)
encode in DER.
How can i make the request using the php?

Answer 1

you can use curl function in php.
Ok, This is part of my edited/modified tcpdf.php.
//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');
}
}