Lua Requires Chilkat v9.5.0.67+

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. Lua

local chilkat = require("chilkat")

-- 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.)
local cert = chilkat.Cert.new()
local success = cert:load_from_file("qa_data/rsaes-oaep/cert.pem")
if not success then
    print(cert.last_error_text)
    return
end

local email = chilkat.Email.new()

-- 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:add_to("Chilkat GMail", "chilkat.support@gmail.com")

-- Set the email object properties to indicate the desired encryption.
email.pkcs7_crypt_alg = "aes"
-- If AES-256 is desired, set the following property to 256.
email.pkcs7_key_length = 128
email.oaep_padding = true
-- Other choices for the OAEP hash algorithm are "sha1", "sha384", and "sha512"
email.oaep_hash = "sha256"

-- Provide the certificate to be used for encryption
email:add_encrypt_cert(cert)

-- Don't forget to indicate that the email should be encrypted when sent..
email.send_encrypted = true

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

-- Set the SMTP settings for your email account on your mail server.
mailman.smtp_username = "SMTP_LOGIN"
mailman.smtp_password = "SMTP_PASSWORD"
mailman.smtp_host = "MY_SMTP_DOMAIN_OR_IP"
mailman.smtp_port = 587
mailman.start_tls = true

-- Send the email.  The mailman will encrypt the email as directed by the
-- property settings of the email object.
success = mailman:send_email(email)
if not success then
    print(mailman.last_error_text)
    return
end

success = mailman:close_smtp_connection()
if not success then
    print("Connection to SMTP server not closed cleanly.")
end

print("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=