(PHP Extension) Send Encrypted Email using Certificate in Apple Keychain

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Send encrypted (S/MIME) email using a certificate found in the Apple Keychain.

Note: This example requires Chilkat v10.1.2 or later.

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<?php

include("chilkat.php");
// Use "chilkat_9_5_0.php" for versions of Chilkat < 10.0.0

$email = new CkEmail();
$email->put_Subject('This email is encrypted');
$email->put_Body('This is a S/MIME encrypted mail');
$email->put_From('Joe <joe@example.com>');

// Emails are encrypted using the recipient's certificate.
$recipientEmailAddr = 'jane@example2.com';
$email->AddTo('',$recipientEmailAddr);

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

$cert = new CkCert();

// -----------------------------------------------
// This example requires Chilkat v10.1.2 or later.
// -----------------------------------------------

// The recipient's certificate is used to encrypt.
// This will load the certificate from the Apple Keychain.
$success = $cert->LoadByEmailAddress($recipientEmailAddr);
if ($success != true) {
    print $cert->lastErrorText() . "\n";
    exit;
}

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

$mailman = new CkMailMan();
$mailman->put_SmtpHost('smtp.example.com');
$mailman->put_SmtpUsername('joe@example.com');
$mailman->put_SmtpPort(587);
$mailman->put_StartTLS(true);

// We'll get the SMTP password from the Apple Keychain.
// See how we originally saved the email credentials to the Keychain here:
// Save Email Credentials in Apple Keychain or Windows Credentials Manager
$secrets = new CkSecrets();

// On Windows, this is the Windows Credentials Manager
// On MacOS/iOS, it is the Apple Keychain
$secrets->put_Location('local_manager');

// Specify the name of the secret.
// service and username are required.
// appName and domain are optional.
// Note: The values are arbitrary and can be anything you want.
$json = new CkJsonObject();
$json->UpdateString('appName','MyEmailApp');
$json->UpdateString('service','SMTP');
$json->UpdateString('domain','example.com');
$json->UpdateString('username','joe@example.com');

$mailman->put_SmtpPassword($secrets->getSecretStr($json));

// Send the encrypted email.
// The email is encrypted and sent within the SendEmail function.
$success = $mailman->SendEmail($email);
if ($success != true) {
    print $mailman->lastErrorText() . "\n";
    exit;
}

print 'Encrypted email sent!' . "\n";

?>