PowerShell

Export a Public Key as PEM

Demonstrates the Chilkat PublicKey.GetPem method, which returns the public key in PEM format. The only argument selects the underlying DER representation: true prefers the traditional PKCS #1 form (RSA), false uses the SubjectPublicKeyInfo form.

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: PEM is the most portable way to share a public key — the Base64 text block most tooling reads. The boolean picks the encoding: false produces the modern, algorithm-independent PUBLIC KEY (SubjectPublicKeyInfo), which is the usual choice; true produces the older RSA-specific RSA PUBLIC KEY for tools that require it. A public key is not sensitive, so the PEM can be distributed openly.

Chilkat PowerShell Downloads

Download Chilkat for PowerShell

PowerShell

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

$success = $false

#  Load a public key to export.  LoadFromFile inspects the content, so it accepts DER, PEM, XML,
#  JWK, and other supported representations.
$pubKey = New-Object Chilkat.PublicKey
$success = $pubKey.LoadFromFile("qa_data/public.pem")
if ($success -eq $false) {
    $($pubKey.LastErrorText)
    exit
}

#  Export the public key in PEM format.  The argument selects the underlying DER representation:
#  $true prefers the traditional PKCS #1 form (RSA), $false uses the SubjectPublicKeyInfo form.
$preferPkcs1 = $false
$pem = $pubKey.GetPem($preferPkcs1)
if ($pubKey.LastMethodSuccess -eq $false) {
    $($pubKey.LastErrorText)
    exit
}

$($pem)