Classic ASP

Set the Decryption Certificate for an Email

Demonstrates the Chilkat Email.SetDecryptCert method, which explicitly provides a certificate (with access to its private key) for decrypting a received encrypted email. Set the certificate before loading the encrypted message so Chilkat can decrypt it automatically. This example loads the certificate from a PFX, sets it, and then loads an encrypted email.

Background: Decrypting S/MIME email requires the recipient's private key. On Windows and macOS, Chilkat can find an installed certificate automatically, but when the key lives in a standalone PFX file you provide it explicitly with SetDecryptCert. A PFX (PKCS#12) bundles the certificate and its private key in one password-protected file. If the certificate and key are in separate files, use SetDecryptCert2 instead.

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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 SetDecryptCert method, which explicitly provides a certificate (with
'  access to its private key) for decrypting a received encrypted email.  Set the cert
'  before loading the encrypted email so it can be decrypted automatically.

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

'  Load a certificate together with its private key from a PFX file.
set cert = Server.CreateObject("Chilkat.Cert")
success = cert.LoadPfxFile("qa_data/certs/decryption.pfx","pfx_password")
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( cert.LastErrorText) & "</pre>"
    Response.End
End If

'  Provide the certificate to use for decryption.
success = email.SetDecryptCert(cert)
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( email.LastErrorText) & "</pre>"
    Response.End
End If

'  Load the encrypted email; Chilkat decrypts it using the certificate.
success = email.LoadEml("qa_data/eml/encrypted.eml")
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( email.LastErrorText) & "</pre>"
    Response.End
End If

Response.Write "<pre>" & Server.HTMLEncode( "ReceivedEncrypted = " & email.ReceivedEncrypted) & "</pre>"
Response.Write "<pre>" & Server.HTMLEncode( "Decrypted = " & email.Decrypted) & "</pre>"

'  Note: Paths such as "qa_data/..." are relative local filesystem paths,
'  relative to the current working directory of the running application.

%>
</body>
</html>