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(Classic ASP) Load Signed and/or Encrypted Email and Unwrap Security Layers

The LoadEml method loads an email (.eml file containing the MIME of an email) and automatically unwraps the digital signature and encryption security layers. A program can then examine the properties of the email object to see what was unwrapped.

Chilkat ActiveX Downloads

ActiveX for 32-bit and 64-bit Windows

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<%
set email = Server.CreateObject("Chilkat_9_5_0.Email")

'  Provide PFX/.p12 files for any certs+keys needed for decryption.
'  Signature verification does not need anything extra.
'  (Also, Chilkat will automatically find and use pre-installed certs + private keys needed for decryption
'  on a Windows system.)
success = email.AddPfxSourceFile("/pfxFiles/certs_and_keys_1.pfx","pfxPassword1")
If (success <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( email.LastErrorText) & "</pre>"
    Response.End
End If

success = email.AddPfxSourceFile("/pfxFiles/certs_and_keys_2.pfx","pfxPassword2")
If (success <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( email.LastErrorText) & "</pre>"
    Response.End
End If

'  ...

'  Load a potentially signed and/or encrypted email.
success = email.LoadEml("someDir/someEmail.eml")

'  If the email was signed and/or encrypted, it was "unwrapped", i.e.
'  the email is already decrypted and in a state as if it were never signed or encrypted.

'  You may check to see if the email was received encrypted or signed, and if so,
'  whether it was successfully unwrapped and who signed or encrypted it:
If (email.ReceivedEncrypted = 1) Then

    Response.Write "<pre>" & Server.HTMLEncode( "This email was encrypted.") & "</pre>"
    If (email.Decrypted = 1) Then
        Response.Write "<pre>" & Server.HTMLEncode( "This email was successfully decrypted.  It was encrypted by:") & "</pre>"
        Response.Write "<pre>" & Server.HTMLEncode( email.EncryptedBy) & "</pre>"
    Else
        Response.Write "<pre>" & Server.HTMLEncode( "This email was not decrypted.") & "</pre>"
    End If

End If

If (email.ReceivedSigned = 1) Then

    Response.Write "<pre>" & Server.HTMLEncode( "This email was signed.") & "</pre>"
    If (email.SignaturesValid = 1) Then
        Response.Write "<pre>" & Server.HTMLEncode( "The signature was verified.  It was signed by:") & "</pre>"
        Response.Write "<pre>" & Server.HTMLEncode( email.SignedBy) & "</pre>"
    Else
        Response.Write "<pre>" & Server.HTMLEncode( "The signature verification failed.") & "</pre>"
    End If

End If

'  At this point, the contents of the email, including attachments, can be accessed normally..

%>
</body>
</html>

 

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