Lua Requires Chilkat v10.0.0+

Send aes-gcm authEnvelopedData Encrypted Email

See more SMTP Examples

Demonstrates how to send encrypted email using 128-bit AES in GCM mode.

"AES-GCM" (Advanced Encryption Standard - Galois/Counter Mode) is a cryptographic algorithm that provides both encryption and integrity protection (authentication). When used in the context of email security with "authEnvelopedData", it often refers to a method of securely sending encrypted and authenticated email content.

Here’s a brief breakdown:

• AES-GCM: Combines symmetric encryption (AES) with authentication, ensuring both the confidentiality and integrity of the message. It generates an authentication tag to detect any unauthorized changes.
• authEnvelopedData: Refers to a type of structure used in secure email protocols (like S/MIME) to package encrypted content. It contains the encrypted data and associated encrypted session keys.
• Email Security: When applied to emails, AES-GCM ensures the email content is encrypted (confidential) and also tamper-resistant (authenticated), with the encryption keys typically shared securely using asymmetric encryption (e.g., public key infrastructure, or PKI).

In short, AES-GCM with "authEnvelopedData" provides a way to encrypt and authenticate emails, making them confidential and resistant to tampering.

Lua

local chilkat = require("chilkat")

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

-- The mailman object is used for sending and receiving email.
local mailman = chilkat.MailMan.new()

mailman.smtp_host = "smtp.example.com"

mailman.smtp_username = "my_smtp_login"
mailman.smtp_password = "my_smtp_password"

-- The typical SMTP ports are 465 for implicit SSL/TLS or 587 for explicit SSL/TLS
mailman.smtp_port = 465
mailman.smtp_ssl = true

-- Use the recipient's certificate for encryption.
local cert = chilkat.Cert.new()
local success = cert:load_from_file("c:/someDir/recipient_cert.cer")
if not success then
    print(cert.last_error_text)
    return
end

local email = chilkat.Email.new()

email.subject = "This email is encrypted"
email.body = "This is AES-GCM encrypted mail"
email.from = "Mary <mary@example1.com>"
success = email:add_to("Joe", "joe@example.com")

-- Specify that AES-GCM w/ authEnvelopedData is to be used.
-- Also specify other params..
email.pkcs7_crypt_alg = "aes-gcm"
email.pkcs7_key_length = 128
email.oaep_padding = true
email.oaep_hash = "sha256"
email.oaep_mgf_hash = "sha256"

-- Indicate the email is to be sent encrypted.
email.send_encrypted = true

-- Specify the certificate to be used for encryption.
success = email:set_encrypt_cert(cert)

success = mailman:send_email(email)
if not success then
    print(mailman.last_error_text)
else
    print("Mail Sent!")
end