Java

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 Java

import com.chilkatsoft.chilkat2.Cert;
import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.Email;
import com.chilkatsoft.chilkat2.MailMan;

public class ChilkatExample {

    public static void main(String[] args) {
        // 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 cert = new Cert();
        try {
            cert.loadFromFile("qa_data/rsaes-oaep/cert.pem");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        Email email = new Email();

        // Create a simple email.
        email.setSubject("Sample RSAES-OAEP Encrypted Email");
        email.setBody("Sample RSAES-OAEP Encrypted Email");
        email.setFrom("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.setPkcs7CryptAlg("aes");
        // If AES-256 is desired, set the following property to 256.
        email.setPkcs7KeyLength(128);
        email.setOaepPadding(true);
        // Other choices for the OAEP hash algorithm are "sha1", "sha384", and "sha512"
        email.setOaepHash("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.setSendEncrypted(true);

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

        // Set the SMTP settings for your email account on your mail server.
        mailman.setSmtpUsername("SMTP_LOGIN");
        mailman.setSmtpPassword("SMTP_PASSWORD");
        mailman.setSmtpHost("MY_SMTP_DOMAIN_OR_IP");
        mailman.setSmtpPort(587);
        mailman.setStartTLS(true);

        // Send the email.  The mailman will encrypt the email as directed by the
        // property settings of the email object.
        try {
            mailman.sendEmail(email);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        try {
            mailman.closeSmtpConnection();
        } catch (ChilkatException e) {
            System.out.println("Connection to SMTP server not closed cleanly.");
        }

        System.out.println("Mail Sent!");

        // -----------------------------------------------------------
        // 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=
    }
}