PHP Extension

Sign String to create a CAdES-T Signature

See more CAdES Examples

This example will sign a string to create a CAdEST-T signature.

Note: This example requires Chilkat v9.5.0.78 or greater.

PHP Extension

<?php

include("chilkat.php");

$success = false;

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

$crypt = new CkCrypt2();

// This example will use the certificate + private key currently inserted into a smartcard reader.
$cert = new CkCert();

// If we wish to provide the smartcard PIN (otherwise the user will be prompted by the operating system).
$cert->put_SmartCardPin('000000');
$success = $cert->LoadFromSmartcard('');
if ($success != true) {
    print $cert->lastErrorText() . "\n";
    exit;
}

// Note: It is also possible to use certs from .pfx/.p12, .pem, or other sources such as 
// pre-installed Windows certificates.

$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 = 'THIS IS MY ID';

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

// 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";

// Or save the signature to a file.
$bd->WriteFile('qa_output/cades-t_sample.p7m');

print 'Success.' . "\n";

?>