PowerShell

Export an Encrypted PKCS #8 Private Key as Encoded Text

Demonstrates the Chilkat PrivateKey.GetPkcs8EncryptedENC method, which exports the key as password-protected PKCS #8 DER and encodes the encrypted DER as text. The first argument names the binary encoding and the second is the password. The cipher is selected by Pkcs8EncryptAlg.

Note: The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background: This combines encryption with text encoding: the key is protected by a passphrase and returned as a string, ideal for storing an encrypted key in a text-only medium such as JSON or an environment variable. It is the encrypted counterpart to GetPkcs8ENC. Source the password securely.

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

$success = $false

#  Load a private key to export.
$privKey = New-Object Chilkat.PrivateKey
$success = $privKey.LoadPemFile("qa_data/private.pem")
if ($success -eq $false) {
    $($privKey.LastErrorText)
    exit
}

#  The key password is not hard-coded in a real application; obtain it from an interactive
#  prompt, environment variable, or a secrets vault.
$password = "myKeyPassword"

#  Export as password-protected PKCS #8 DER, then encode the encrypted DER as text.  The 1st
#  argument names the binary encoding and the 2nd is the password.  The cipher is selected by the
#  Pkcs8EncryptAlg property.
$encoded = $privKey.GetPkcs8EncryptedENC("base64",$password)
if ($privKey.LastMethodSuccess -eq $false) {
    $($privKey.LastErrorText)
    exit
}

$($encoded)