PHP ActiveX

Clear the Encryption Certificates of an Email

Demonstrates the Chilkat Email.ClearEncryptCerts method, which clears the internal list of explicitly specified certificates used when sending encrypted email — the certificates previously added with AddEncryptCert or SetEncryptCert. This example adds a recipient certificate and then clears the list.

Background: When encrypting to multiple recipients you register each one's certificate with AddEncryptCert. If an Email object is reused for different sets of recipients, those registered certificates would otherwise persist. ClearEncryptCerts resets that list so the next encrypted message is protected for exactly the intended recipients — a useful safeguard against accidentally encrypting for a stale recipient.

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<?php

$success = 0;

//  Demonstrates the ClearEncryptCerts method, which clears the internal list of explicitly
//  specified certificates used for sending encrypted email (the certificates added by
//  AddEncryptCert / SetEncryptCert).

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

//  Add a recipient certificate to the encryption cert list...
$cert = new COM("Chilkat.Cert");
$success = $cert->LoadFromFile('qa_data/certs/recipient.cer');
if ($success == 0) {
    print $cert->LastErrorText . "\n";
    exit;
}

$success = $email->AddEncryptCert($cert);
if ($success == 0) {
    print $email->LastErrorText . "\n";
    exit;
}

//  ...then clear all explicitly-specified encryption certificates.
$email->ClearEncryptCerts();

print 'Cleared the explicitly-specified encryption certificates.' . "\n";

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

?>