PHP

Set Cert and Private Key for S/MIME Decryption

Demonstrates the Chilkat Imap.SetDecryptCert2 method, which specifies a certificate together with a separately supplied private key for decrypting S/MIME messages. The first argument is the Cert and the second is the PrivateKey. This example loads the certificate and key from separate files.

Note: The certificate path is relative to the application's current working directory. Supply the path to your own certificate file.

Background: Sometimes the certificate (the public part) and the private key are stored separately — a .cer alongside a PEM key file, for instance. This method pairs them explicitly, whereas SetDecryptCert expects a single Cert that already provides its private key. After the pairing, subsequently downloaded S/MIME messages are decrypted automatically.

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<?php

use Chilkat2\Cert;
use Chilkat2\Imap;
use Chilkat2\PrivateKey;

// Demonstrates the Imap.SetDecryptCert2 method, which specifies a certificate together with a
// separately supplied private key for decrypting S/MIME messages.  The 1st argument is the
// Cert and the 2nd is the PrivateKey.

$imap = new Imap();

$imap->Ssl = true;
$imap->Port = 993;

try {
    $imap->Connect('imap.example.com');

    $imap->Login('user@example.com', 'myPassword');

    // Load the certificate and its private key from separate files.
    $cert = new Cert();
    $cert->LoadFromFile('qa_data/smime.cer');

    $privKey = new PrivateKey();
    $privKey->LoadPemFile('qa_data/smime_privkey.pem');

    // Use the cert and key to automatically decrypt subsequently downloaded S/MIME messages.
    $imap->SetDecryptCert2($cert, $privKey);

    $imap->Disconnect();
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}