(PHP ActiveX) S/MIME Encrypt .eml without Sending

See more Email Object Examples

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows Note: The php_com_dotnet.dll may need to be enabled inside of php.ini.

<?php

$success = 0;

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

$email = new COM("Chilkat.Email");

$success = $email->LoadEml('c:/temp/email/unencrypted.eml');
if ($success == 0) {
    print $email->LastErrorText . "\n";
    exit;
}

// The email content is encrypted using AES with a 256-bit key, operating in GCM mode, which provides authenticated encryption.
$email->Pkcs7CryptAlg = 'aes-gcm';
$email->Pkcs7KeyLength = 256;
$email->OaepPadding = 1;
$email->OaepHash = 'sha256';
$email->OaepMgfHash = 'sha256';

$cert = new COM("Chilkat.Cert");
$success = $cert->LoadFromFile('c/temps/cert/recipient.cer');
if ($success == 0) {
    print $cert->LastErrorText . "\n";
    exit;
}

$email->SendEncrypted = 1;
$email->SetEncryptCert($cert);

$sbSmime = new COM("Chilkat.StringBuilder");

// The mailman object applies the encryption by rendering the email according to the instructions (property settings) provided in the email object.
// No email is sent.
$mailman = new COM("Chilkat.MailMan");
$success = $mailman->RenderToMimeSb($email,$sbSmime);
if ($success == 0) {
    print $mailman->LastErrorText . "\n";
    exit;
}

$success = $sbSmime->WriteFile('c:/temp/encryptedEmail.eml','utf-8',0);
if ($success == 0) {
    print $mailman->LastErrorText . "\n";
    exit;
}

print 'Success!' . "\n";

?>