Create PKCS7 Attached/Opaque Signature (S/MIME)

Create an S/MIME message with a PKCS7 attached/opaque signature.

Download Chilkat MIME ActiveX

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<%
set mime = Server.CreateObject("Chilkat.Mime")

success = mime.UnlockComponent("Anything for 30-day trial")
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( mime.LastErrorText) & "</pre>"

End If

'  Load a certificate w/ private key for signing.
'  There are many ways of getting a certificate object:
'  from a pfx file, from .cer and private-key files, from the
'  Windows registry-based certificate stores, etc.
'  For this example, we'll use a pre-installed cert from
'  a certificate store.
set cert = Server.CreateObject("Chilkat.Cert")
success = cert.LoadByCommonName("Chilkat Software, Inc.")
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( cert.LastErrorText) & "</pre>"

End If

'  Create a very simple MIME message to be signed:
mime.AddHeaderField "Subject","This is a test"
mime.AddHeaderField "MyCustomHeader","abc123"
mime.ContentType = "text/plain"
mime.SetBody "This is a plain-text body."

'  Examine the MIME prior to signing:
Response.Write "<pre>" & Server.HTMLEncode( "--- MIME prior to signing ---") & "</pre>"
Response.Write "<pre>" & Server.HTMLEncode( mime.GetMime()) & "</pre>"

'  The MIME prior to signing looks like this:
'  -------------------------------------------------------------------------------
'  
Subject: This is a test
MyCustomHeader: abc123
Content-Type: text/plain

This is a plain-text body.
'  -------------------------------------------------------------------------------

'  The default hash algorithm used in the signing process is "SHA1".
'  To change it, set the SigningHashAlg property:
mime.SigningHashAlg = "SHA256"

'  Convert the MIME to PKCS7 signed-data.
success = mime.ConvertToSigned(cert)
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( mime.LastErrorText) & "</pre>"

End If

'  Examine the signed MIME
Response.Write "<pre>" & Server.HTMLEncode( "--- MIME converted to PKCS7 signed-data ---") & "</pre>"
Response.Write "<pre>" & Server.HTMLEncode( mime.GetMime()) & "</pre>"

'  The MIME after signing looks like this:
'  -------------------------------------------------------------------------------
'  
Subject: This is a test
MyCustomHeader: abc123
Content-Disposition: attachment; filename="smime.p7m"
Content-Transfer-Encoding: base64
Content-Type: application/x-pkcs7-mime;
 name="smime.p7m"; smime-type="signed-data"

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'  -------------------------------------------------------------------------------

%>
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