PowerShell

Save a Private Key as a PKCS #8 DER File

Demonstrates the Chilkat PrivateKey.SavePkcs8File method, which saves the key as unencrypted PKCS #8 DER to a file. The only argument is the destination path.

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: The file-writing counterpart to GetPkcs8ENC/GetPkcs8Pem, producing a compact binary .der in the algorithm-independent PKCS #8 container. Because it is unencrypted, the file itself is the only protection for the key — store it with restrictive permissions, or use SavePkcs8EncryptedFile to add a passphrase.

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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
}

#  Save as unencrypted PKCS #8 DER.
$success = $privKey.SavePkcs8File("qa_output/private_pkcs8.der")
if ($success -eq $false) {
    $($privKey.LastErrorText)
    exit
}

$("Saved.")