VB.NET

Add a PFX Source (BinData) for S/MIME Decryption

Demonstrates the Chilkat Imap.AddPfxSourceBd method, which adds PFX data held in a BinData as a source of certificates and private keys for S/MIME processing. The first argument is the BinData and the second is the PFX password. Call it once for each additional source.

Note: The certificate path is relative to the application's current working directory. Supply the path to your own certificate file.

Background: When downloading encrypted (S/MIME) email, Chilkat needs the recipient's private key to decrypt it. Adding one or more PFX sources gives Chilkat a pool of keys to search; the matching key is used automatically as messages are fetched. The BinData form is handy when the PFX comes from memory — a database blob or a downloaded buffer — rather than a file on disk. On Windows and macOS the system certificate stores are also searched automatically.

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Dim success As Boolean = False

'  Demonstrates the Imap.AddPfxSourceBd method, which adds PFX data (from a BinData) as a
'  source of certificates and private keys for S/MIME decryption.  The 1st argument is the
'  BinData containing the PFX, and the 2nd is the PFX password.

Dim imap As New Chilkat.Imap

imap.Ssl = True
imap.Port = 993

success = imap.Connect("imap.example.com")
If (success = False) Then
    Debug.WriteLine(imap.LastErrorText)
    Exit Sub
End If

success = imap.Login("user@example.com","myPassword")
If (success = False) Then
    Debug.WriteLine(imap.LastErrorText)
    Exit Sub
End If


'  Load the PFX data into a BinData.
Dim bdPfx As New Chilkat.BinData
success = bdPfx.LoadFile("qa_data/smime.pfx")
If (success = False) Then
    Debug.WriteLine(bdPfx.LastErrorText)
    Exit Sub
End If


'  The PFX password is not hard-coded in source.  Insert code here to obtain it from an
'  interactive prompt, environment variable, or a secrets vault.
Dim pfxPassword As String

'  Add the PFX as a source for S/MIME certificates and private keys.  Call once per source.
success = imap.AddPfxSourceBd(bdPfx,pfxPassword)
If (success = False) Then
    Debug.WriteLine(imap.LastErrorText)
    Exit Sub
End If


'  Messages downloaded after this are automatically decrypted when a matching key is found.

success = imap.Disconnect()
If (success = False) Then
    Debug.WriteLine(imap.LastErrorText)
    Exit Sub
End If