PHP

Set the Signing Certificate for an Email

Demonstrates the Chilkat Email.SetSigningCert method, which sets the certificate (with access to its private key) used to create a digital signature when sending signed email. This example loads the signing certificate from a PFX, sets it, and enables signed sending.

Background: Signing uses your own private key (the opposite of encrypting, which uses the recipient's public key), so the signing certificate must include private-key access. A PFX (PKCS#12) file bundles the certificate and its private key together, which is why it is loaded here with LoadPfxFile. If the certificate and key are in separate files, use SetSigningCert2 instead.

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<?php

use Chilkat2\Cert;
use Chilkat2\Email;

// Demonstrates the SetSigningCert method, which sets the certificate (with access to its
// private key) used for creating a digital signature when sending signed email.

$email = new Email();
$email->Subject = 'Signed email';
$email->Body = 'This message will be sent with a digital signature.';
$email->From = 'alice@example.com';
$email->AddTo('Bob', 'bob@example.com');

// Load a signing certificate together with its private key from a PFX file.
$cert = new Cert();
try {
    $cert->LoadPfxFile('qa_data/certs/signer.pfx', 'pfx_password');

    // Set the certificate used to create the signature.
    $email->SetSigningCert($cert);
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

// Request that the email be sent with a digital signature.
$email->SendSigned = true;

echo "Signing certificate set.\n";

// Note: The path "qa_data/certs/signer.pfx" is a relative local filesystem path,
// relative to the current working directory of the running application.