PHP

Set the Decryption Certificate for an Email

Demonstrates the Chilkat Email.SetDecryptCert method, which explicitly provides a certificate (with access to its private key) for decrypting a received encrypted email. Set the certificate before loading the encrypted message so Chilkat can decrypt it automatically. This example loads the certificate from a PFX, sets it, and then loads an encrypted email.

Background: Decrypting S/MIME email requires the recipient's private key. On Windows and macOS, Chilkat can find an installed certificate automatically, but when the key lives in a standalone PFX file you provide it explicitly with SetDecryptCert. A PFX (PKCS#12) bundles the certificate and its private key in one password-protected file. If the certificate and key are in separate files, use SetDecryptCert2 instead.

Chilkat PHP Downloads

Download Chilkat for PHP

Chilkat2 PHP

<?php

use Chilkat2\Cert;
use Chilkat2\Email;

// Demonstrates the SetDecryptCert method, which explicitly provides a certificate (with
// access to its private key) for decrypting a received encrypted email.  Set the cert
// before loading the encrypted email so it can be decrypted automatically.

$email = new Email();

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

    // Provide the certificate to use for decryption.
    $email->SetDecryptCert($cert);

    // Load the encrypted email; Chilkat decrypts it using the certificate.
    $email->LoadEml('qa_data/eml/encrypted.eml');
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

echo 'ReceivedEncrypted = ', ($email->ReceivedEncrypted ? 'true' : 'false'), "\n";
echo 'Decrypted = ', ($email->Decrypted ? 'true' : 'false'), "\n";

// Note: Paths such as "qa_data/..." are relative local filesystem paths,
// relative to the current working directory of the running application.