PHP Extension

Sign String to create a CAdES-T Signature, using HTTP Proxy to Access Timestamp Server

This example will sign a string to create a CAdEST-T signature. It will use an HTTP proxy to access the timestamp server. PHP Extension

<?php

include("chilkat.php");

$success = false;

$crypt = new CkCrypt2();

$cert = new CkCert();
$cert->put_SmartCardPin('123456');
$success = $cert->LoadFromSmartcard('');
if ($success != true) {
    print $cert->lastErrorText() . "\n";
    exit;
}

$success = $crypt->SetSigningCert($cert);

// Use SHA-256 rather than the default of SHA-1
$crypt->put_HashAlgorithm('sha256');

// Create JSON that tells Chilkat what signing attributes to include:
$attrs = new CkJsonObject();
$attrs->UpdateBool('contentType',true);
$attrs->UpdateBool('signingTime',true);
$attrs->UpdateBool('messageDigest',true);
$attrs->UpdateBool('signingCertificateV2',true);

// A CAdES-T signature is one that includes a timestampToken created by an online TSA (time stamping authority).
// We must include the TSA's URL, as well as a few options to indicate what is desired.
// Except for the TSA URL, the options shown here are typically what you would need.
$attrs->UpdateBool('timestampToken.enabled',true);
$attrs->UpdateString('timestampToken.tsaUrl','https://freetsa.org/tsr');
$attrs->UpdateBool('timestampToken.addNonce',false);
$attrs->UpdateBool('timestampToken.requestTsaCert',true);
$attrs->UpdateString('timestampToken.hashAlg','sha256');

$crypt->put_SigningAttributes($attrs->emit());

$strToSign = 'Hello World!';

$bd = new CkBinData();
$bd->AppendString($strToSign,'utf-8');

// -------------------------------------------------------------------------
// The purpose of this example is to show how an HTTP object with custom
// settings can be used to access the Internet when signing.
// Access to the Internet is needed to communicate with the timestamp server.
$http = new CkHttp();
// This can be a domain name, hostname, or IP address.
$http->put_ProxyDomain('172.16.16.56');
$http->put_ProxyPort(808);
$http->put_ProxyLogin('myProxyLogin');
$http->put_ProxyPassword('myProxyPassword');
$crypt->SetTsaHttpObj($http);
// -------------------------------------------------------------------------

// This creates the CAdES-T signature.  During the signature creation, it
// communicates with the TSA to get a timestampToken.
// The contents of bd are signed and replaced with the CAdES-T signature (which embeds the original content).
$success = $crypt->OpaqueSignBd($bd);
if ($success != true) {
    print $crypt->lastErrorText() . "\n";
    exit;
}

// Get the signature in base64 format:
print $bd->getEncoded('base64_mime') . "\n";

print 'Success.' . "\n";

?>