Classic ASP

Remove All S/MIME Security Layers (UnwrapSecurity)

Demonstrates the Chilkat Mime.UnwrapSecurity method, which removes supported S/MIME security layers and restores the underlying MIME content. It takes no arguments and handles both layer orders: signed-then-encrypted and encrypted-then-signed.

Note: The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background: A message can be both signed and encrypted, in either order, producing nested S/MIME wrappers. UnwrapSecurity peels them all off in one call — verifying signatures and decrypting as it goes — so you do not have to detect the layering and call Verify and Decrypt in the right sequence yourself. Decryption still requires the recipient's certificate and private key to be configured.

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Classic ASP

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

'  Demonstrates the Mime.UnwrapSecurity method, which removes supported S/MIME security layers and
'  restores the underlying MIME content.  It takes no arguments and handles both layer orders
'  (signed-then-encrypted and encrypted-then-signed).

set mime = Server.CreateObject("Chilkat.Mime")
success = mime.LoadMimeFile("qa_data/secured.eml")
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( mime.LastErrorText) & "</pre>"
    Response.End
End If

'  A single call peels off the signature and/or encryption layers.  (Decryption requires the
'  appropriate certificate/private key to be configured first.)
success = mime.UnwrapSecurity()
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( mime.LastErrorText) & "</pre>"
    Response.End
End If

Response.Write "<pre>" & Server.HTMLEncode( "Security layers removed. Content-Type is now: " & mime.ContentType) & "</pre>"

%>
</body>
</html>