PowerShell

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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Add-Type -Path "C:\chilkat\ChilkatDotNet47-x64\ChilkatDotNet47.dll"

$success = $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.

$imap = New-Object Chilkat.Imap

$imap.Ssl = $true
$imap.Port = 993

$success = $imap.Connect("imap.example.com")
if ($success -eq $false) {
    $($imap.LastErrorText)
    exit
}

$success = $imap.Login("user@example.com","myPassword")
if ($success -eq $false) {
    $($imap.LastErrorText)
    exit
}

#  Load the PFX data into a BinData.
$bdPfx = New-Object Chilkat.BinData
$success = $bdPfx.LoadFile("qa_data/smime.pfx")
if ($success -eq $false) {
    $($bdPfx.LastErrorText)
    exit
}

#  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.

#  Add the PFX as a source for S/MIME certificates and private keys.  Call once per source.
$success = $imap.AddPfxSourceBd($bdPfx,$pfxPassword)
if ($success -eq $false) {
    $($imap.LastErrorText)
    exit
}

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

$success = $imap.Disconnect()
if ($success -eq $false) {
    $($imap.LastErrorText)
    exit
}