PKCS7 Encrypt using Multiple Certificates

Encrypts MIME using multiple digital certificates. Calls AddEncryptCert once per certificate, followed by a call to EncryptN. The MIME may be decrypted by any owner of one of the certificates + its associated private key.

Download Chilkat MIME ActiveX

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

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

'  Build a simple MIME message to be encrypted:
mime.AddHeaderField "Content-Type","text/plain"
mime.AddHeaderField "abc","123"
mime.SetBody "This is a test"

'  A digital certificate is required to create PKCS7 encrypted MIME.
'  It can come from a variety of sources: .cer file, .pfx file, PEM files,
'  an in-memory representation, or directly from a Windows
'  registry-based certificate store.

'  Load one cert from a .cer file:
set cert1 = Server.CreateObject("Chilkat.Cert")
success = cert1.LoadFromFile("myCert.cer")
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( cert1.LastErrorText) & "</pre>"

End If

'  Load another cert from the Windows registry store:
set cert2 = Server.CreateObject("Chilkat.Cert")
success = cert2.LoadByCommonName("Chilkat Sales")
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( cert2.LastErrorText) & "</pre>"

End If

'  Tell the MIME object to use these certs for encrypting:
'  (AddEncryptCert shouldn't fail if we already know it contains
'  a valid certificate..)
success = mime.AddEncryptCert(cert1)
success = mime.AddEncryptCert(cert2)

'  Encrypt the MIME:
success = mime.EncryptN()
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( mime.LastErrorText) & "</pre>"

End If

'  Display the MIME:
Response.Write "<pre>" & Server.HTMLEncode( mime.GetMime()) & "</pre>"

'  The resulting S/MIME looks something like this:
'  
abc: 123
Content-Disposition: attachment; filename="smime.p7m"
Content-Transfer-Encoding: base64
Content-Type: application/x-pkcs7-mime;
 name="smime.p7m"

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</html>