(PHP Extension) Find Certificate for Email Encryption

Demonstrates finding the recipient's certificate in the Windows certificate store and using it to send encrypted email.

Chilkat PHP Downloads PHP Extension for Windows, Linux, MacOS, Alpine Linux, Solaris

<?php

// The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number.
// For example, if using Chilkat v9.5.0.48, then include as shown here:
include("chilkat_9_5_0.php");

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

$mailman = new CkMailMan();

// Set the SMTP server.
$mailman->put_SmtpHost('smtp.example.com');

// Create a new email object
$email = new CkEmail();

$email->put_Subject('This email is encrypted');
$email->put_Body('This is a digitally encrypted mail');
$email->put_From('Joe <joe@example.com>');
// Emails are encrypted using the recipient's certificate.
$recipientEmailAddr = 'jane@example2.com';
$email->AddTo('Jane',$recipientEmailAddr);

// Indicate that the email is to be sent encrypted.
$email->put_SendEncrypted(true);

// This example demonstrates finding the email encryption certificate
// on a Windows system where the certificate is stored in the Windows 
// certificate store.

$cert = new CkCert();
// The recipient's certificate is used to encrypt.
// (Because the recipient is the only one in possession of the private key to decrypt.)
$success = $cert->LoadByEmailAddress($recipientEmailAddr);
if ($success != true) {
    print $cert->lastErrorText() . "\n";
    exit;
}

// Specify the certificate to be used for encryption.
$success = $email->SetEncryptCert($cert);

$success = $mailman->SendEmail($email);
if ($success != true) {
    print $mailman->lastErrorText() . "\n";
}
else {
    print 'Encrypted Mail Sent!' . "\n";
}


?>