PHP

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.

Chilkat2 PHP

<?php

use Chilkat2\BinData;
use Chilkat2\Cert;
use Chilkat2\Crypt2;
use Chilkat2\JsonObject;

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

$crypt = new Crypt2();

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

// If we wish to provide the smartcard PIN (otherwise the user will be prompted by the operating system).
$cert->SmartCardPin = '000000';
try {
    $cert->LoadFromSmartcard('');

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

    $crypt->SetSigningCert($cert);

    // Use SHA-256 rather than the default of SHA-1
    $crypt->HashAlgorithm = 'sha256';

    // Create JSON that tells Chilkat what signing attributes to include:
    $attrs = new JsonObject();
    $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->SigningAttributes = $attrs->Emit();

    $strToSign = 'THIS IS MY ID';

    $bd = new BinData();
    $bd->AppendString($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).
    $crypt->OpaqueSignBd($bd);
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

// Get the signature in base64 format:
echo $bd->GetEncoded('base64_mime'), "\n";

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

echo "Success.\n";