Classic ASP

S/MIME Encrypt .eml without Sending

Demonstrates how to encrypt an email using the recipient's digital certificate. This example just encrypts, and does not send the email.

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Classic ASP

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<%
success = 0

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

set email = Server.CreateObject("Chilkat.Email")

success = email.LoadEml("c:/temp/email/unencrypted.eml")
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( email.LastErrorText) & "</pre>"
    Response.End
End If

' The email content is encrypted using AES with a 256-bit key, operating in GCM mode, which provides authenticated encryption.
email.Pkcs7CryptAlg = "aes-gcm"
email.Pkcs7KeyLength = 256
email.OaepPadding = 1
email.OaepHash = "sha256"
email.OaepMgfHash = "sha256"

set cert = Server.CreateObject("Chilkat.Cert")
success = cert.LoadFromFile("c/temps/cert/recipient.cer")
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( cert.LastErrorText) & "</pre>"
    Response.End
End If

email.SendEncrypted = 1
success = email.SetEncryptCert(cert)

set sbSmime = Server.CreateObject("Chilkat.StringBuilder")

' The mailman object applies the encryption by rendering the email according to the instructions (property settings) provided in the email object.
' No email is sent.
set mailman = Server.CreateObject("Chilkat.MailMan")
success = mailman.RenderToMimeSb(email,sbSmime)
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( mailman.LastErrorText) & "</pre>"
    Response.End
End If

success = sbSmime.WriteFile("c:/temp/encryptedEmail.eml","utf-8",0)
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( mailman.LastErrorText) & "</pre>"
    Response.End
End If

Response.Write "<pre>" & Server.HTMLEncode( "Success!") & "</pre>"

%>
</body>
</html>