(PowerShell) Export Digital Certificate's Public Key

The ExportPublicKey method can be called to get a certificate's public key. It can then be saved to any of a number of formats: (1) OpenSSL DER, (2) OpenSSL PEM, (3) RSA DER, (4) XML.

Chilkat .NET Downloads Chilkat .NET Assemblies

Add-Type -Path "C:\chilkat\ChilkatDotNet47-9.5.0-x64\ChilkatDotNet47.dll"

$cert = New-Object Chilkat.Cert

# LoadFromFile will load virtually any certificate format file.
# It will auto-recognize the format and load appropiately.
$success = $cert.LoadFromFile("/Users/chilkat/testData/cer/chilkat.cer")
if ($success -ne $true) {
    $($cert.LastErrorText)
    exit
}

# Get the public key:

$pubkey = $cert.ExportPublicKey()
if ($cert.LastMethodSuccess -eq $false) {
    $($cert.LastErrorText)
    exit
}

# Save to various formats:
$success = $pubkey.SaveDerFile($false,"/Users/chilkat/testData/pubkeys/chilkat_pkcs8.der")
if ($success -ne $true) {
    $($pubkey.LastErrorText)

    exit
}

$success = $pubkey.SavePemFile($false,"/Users/chilkat/testData/pubkeys/chilkat.pem")
if ($success -ne $true) {
    $($pubkey.LastErrorText)

    exit
}

$success = $pubkey.SaveDerFile($true,"/Users/chilkat/testData/pubkeys/chilkat_pkcs1.der")
if ($success -ne $true) {
    $($pubkey.LastErrorText)

    exit
}

$success = $pubkey.SaveXmlFile("/Users/chilkat/testData/pubkeys/chilkat.xml")
if ($success -ne $true) {
    $($pubkey.LastErrorText)

    exit
}

$("Public key exported to all file formats.")