(PowerShell) Generate an RSA Key and Get as Base64 DER

Demonstrates how to generate a 2048-bit RSA key and return the public and private parts as unencrypted Base64 encoded DER.

Chilkat .NET Downloads Chilkat .NET Assemblies

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

# This example assumes the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

$rsa = New-Object Chilkat.Rsa

# Generate a 2048-bit key.  Chilkat RSA supports
$success = $rsa.GenerateKey(2048)
if ($success -ne $true) {
    $($rsa.LastErrorText)
    exit
}

# Get the public part of the key.
$pubKey = $rsa.ExportPublicKeyObj()

# There are two possible formats for representing the RSA public key 
# in ASN.1 (DER).  The possible formats are PKCS1 and PKCS8.
# We can get either by setting bChoosePkcs1 to $true or $false.
$bChoosePkcs1 = $true
$pubKeyBase64Der = $pubKey.GetEncoded($bChoosePkcs1,"base64")
$("Public Key Base64 DER:")
$($pubKeyBase64Der)

# Now get the private key as Base64 DER:
# Get the private part of the key.
# (Note: A public key is actually just a subset of the private key.  
#  If you have the private key, you also have the public key.
#  Thus Chilkat provides a method to get the public key from the private key.)
$privKey = $rsa.ExportPrivateKeyObj()

# Again, we can get PKCS1 or PKCS8, but with different methods:
$privKeyPkcs1 = $privKey.GetPkcs1ENC("base64")
$("Private Key PKCS1 Base64 DER:")
$($privKeyPkcs1)

$privKeyPkcs8 = $privKey.GetPkcs8ENC("base64")
$("Private Key PKCS8 Base64 DER:")
$($privKeyPkcs8)