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Send aes-gcm authEnvelopedData Encrypted Email

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Note: This example requires Chilkat v10.0.0 or later

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.

AutoIt

Local $bSuccess = False

; 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.
$oMailman = ObjCreate("Chilkat.MailMan")

$oMailman.SmtpHost = "smtp.example.com"

$oMailman.SmtpUsername = "my_smtp_login"
$oMailman.SmtpPassword = "my_smtp_password"

; The typical SMTP ports are 465 for implicit SSL/TLS or 587 for explicit SSL/TLS
$oMailman.SmtpPort = 465
$oMailman.SmtpSsl = True

; Use the recipient's certificate for encryption.
$oCert = ObjCreate("Chilkat.Cert")
$bSuccess = $oCert.LoadFromFile("c:/someDir/recipient_cert.cer")
If ($bSuccess <> True) Then
    ConsoleWrite($oCert.LastErrorText & @CRLF)
    Exit
EndIf

$oEmail = ObjCreate("Chilkat.Email")

$oEmail.Subject = "This email is encrypted"
$oEmail.Body = "This is AES-GCM encrypted mail"
$oEmail.From = "Mary <mary@example1.com>"
$bSuccess = $oEmail.AddTo("Joe","joe@example.com")

; Specify that AES-GCM w/ authEnvelopedData is to be used. 
; Also specify other params..
$oEmail.Pkcs7CryptAlg = "aes-gcm"
$oEmail.Pkcs7KeyLength = 128
$oEmail.OaepPadding = True
$oEmail.OaepHash = "sha256"
$oEmail.OaepMgfHash = "sha256"

; Indicate the email is to be sent encrypted.
$oEmail.SendEncrypted = True

; Specify the certificate to be used for encryption.
$bSuccess = $oEmail.SetEncryptCert($oCert)

$bSuccess = $oMailman.SendEmail($oEmail)
If ($bSuccess <> True) Then
    ConsoleWrite($oMailman.LastErrorText & @CRLF)
Else
    ConsoleWrite("Mail Sent!" & @CRLF)
EndIf