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Set Cert and Private Key for S/MIME Decryption

Demonstrates the Chilkat Imap.SetDecryptCert2 method, which specifies a certificate together with a separately supplied private key for decrypting S/MIME messages. The first argument is the Cert and the second is the PrivateKey. This example loads the certificate and key from separate files.

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

Background: Sometimes the certificate (the public part) and the private key are stored separately — a .cer alongside a PEM key file, for instance. This method pairs them explicitly, whereas SetDecryptCert expects a single Cert that already provides its private key. After the pairing, subsequently downloaded S/MIME messages are decrypted automatically.

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

$success = $false

#  Demonstrates the Imap.SetDecryptCert2 method, which specifies a certificate together with a
#  separately supplied private key for decrypting S/MIME messages.  The 1st argument is the
#  Cert and the 2nd is the PrivateKey.

$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 certificate and its private key from separate files.
$cert = New-Object Chilkat.Cert
$success = $cert.LoadFromFile("qa_data/smime.cer")
if ($success -eq $false) {
    $($cert.LastErrorText)
    exit
}

$privKey = New-Object Chilkat.PrivateKey
$success = $privKey.LoadPemFile("qa_data/smime_privkey.pem")
if ($success -eq $false) {
    $($privKey.LastErrorText)
    exit
}

#  Use the cert and key to automatically decrypt subsequently downloaded S/MIME messages.
$success = $imap.SetDecryptCert2($cert,$privKey)
if ($success -eq $false) {
    $($imap.LastErrorText)
    exit
}

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