PHP

Send Encrypted Email using RSAES-OAEP with AES-128 CBC and SHA256

See more SMTP Examples

Demonstrates how to send encrypted email using RSAES-OAEP with SHA256 and AES-128 content encryption.

Note: This example requires Chilkat v9.5.0.67 or greater.

Chilkat2 PHP

<?php

use Chilkat2\Cert;
use Chilkat2\Email;
use Chilkat2\MailMan;

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

// Load an RSA-based certificate.
// (Encrypting an email only requires the public key.  Decrypting an email requires the private key.)
$cert = new Cert();
try {
    $cert->LoadFromFile('qa_data/rsaes-oaep/cert.pem');

    $email = new Email();

    // Create a simple email.
    $email->Subject = 'Sample RSAES-OAEP Encrypted Email';
    $email->Body = 'Sample RSAES-OAEP Encrypted Email';
    $email->From = 'support@chilkatsoft.com';

    // Add a recipient.
    // (The email is encrypted using the recipient's certificate.
    // If sending to multiple recipients, then the AddEncryptCert method would
    // need to be called once for each recipient's certificate.)
    $email->AddTo('Chilkat GMail', 'chilkat.support@gmail.com');

    // Set the email object properties to indicate the desired encryption.
    $email->Pkcs7CryptAlg = 'aes';
    // If AES-256 is desired, set the following property to 256.
    $email->Pkcs7KeyLength = 128;
    $email->OaepPadding = true;
    // Other choices for the OAEP hash algorithm are "sha1", "sha384", and "sha512"
    $email->OaepHash = 'sha256';

    // Provide the certificate to be used for encryption
    $email->AddEncryptCert($cert);

    // Don't forget to indicate that the email should be encrypted when sent..
    $email->SendEncrypted = true;

    // The mailman object will do the RSAES-OAEP encryption when sending.
    $mailman = new MailMan();

    // Set the SMTP settings for your email account on your mail server.
    $mailman->SmtpUsername = 'SMTP_LOGIN';
    $mailman->SmtpPassword = 'SMTP_PASSWORD';
    $mailman->SmtpHost = 'MY_SMTP_DOMAIN_OR_IP';
    $mailman->SmtpPort = 587;
    $mailman->StartTLS = true;

    // Send the email.  The mailman will encrypt the email as directed by the
    // property settings of the email object.
    $mailman->SendEmail($email);
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\n";
    exit;
}

try {
    $mailman->CloseSmtpConnection();
} catch (\Chilkat2\Exception $e) {
    echo "Connection to SMTP server not closed cleanly.\n";
}

echo "Mail Sent!\n";

// -----------------------------------------------------------
// This is an example of an RSAES-OAEP encrypted email
// -----------------------------------------------------------

// MIME-Version: 1.0
// Date: Thu, 27 Apr 2017 08:43:32 -0500
// Message-ID: <772DC039F0259C474BAC60240EA2BA2272402308@CHILKAT13>
// Content-Type: application/pkcs7-mime; name="smime.p7m"; smime-type="enveloped-data"
// Content-Transfer-Encoding: base64
// X-Priority: 3 (Normal)
// Subject: Sample RSAES-OAEP Encrypted Email
// From: support@chilkatsoft.com
// To: "Chilkat GMail" <chilkat.support@gmail.com>
// Content-Disposition: attachment; filename="smime.p7m"
//
// MIICWQYJKoZIhvcNAQcDoIICSjCCAkYCAQAxggGgMIIBnAIBADB1MGgxCzAJBgNVBAYTAlVTMQsw
// CQYDVQQIDAJJTDEQMA4GA1UEBwwHV2hlYXRvbjEhMB8GA1UECgwYSW50ZXJuZXQgV2lkZ2l0cyBQ
// dHkgTHRkMRcwFQYDVQQDDA5DaGlsa2F0V2lkZ2V0cwIJAMRwugDmvniwMBwGCSqGSIb3DQEBBzAP
// oA0wCwYJYIZIAWUDBAIBBIIBABr0E1dKJjK0FAYRz/NCtJmBeB0nUxgcuBnhGPI/UeyGub3cCo+K
// G5F4/iVTBJqVvYIF5+fvBnyTginwv7OiUiFWLyihiFC3NIyZJO22+XMHpNatCffTPZk10WswkTgk
// G3ApnRvGQAaldnFD0Hs8drPU4vBvY9QsjT7YDGa6u2NMX+sr1ewEZArqU0mNfJ6RsEYd5FQbFEVF
// qLmnz8Dt+yhoJlUtfUd8TXIeqHRJ7RxKOTSzlBZaAdTv2QX4oL9IcAgZeTg5iw+yRPkSAwWyg+I/
// 7fybLsUpRGDHTGUU+AvHvP0kYKa1mkvccBVEC/+4hEyhpS1tWIR5ByY6vM76Z+8wgZwGCSqGSIb3
// DQEHATAdBglghkgBZQMEAQIEEKqD0YDHX1NsVDaV32UczpeAcLteQyRPTV4hATjwcPiVelPfeWNs
// xZKRGaEBqLM8+Y+V4ciCFoOlgJuOcP4m1PTHyilfzd+SCsKz5l1C7+sfPf36n2aacX6IWga59Bz5
// QbWrOHDUT7O5PnGwKVgQFw3Cj4GrdPGWKcoqxB0HuKnj3WA=