Create an AES Key with PowerShell

New-AESKey.ps1

Function New-AesKey {
     Param(
         [Int]$KeySize = 256,
         [Switch]$AsString
     )
     $aesManaged = New-Object "System.Security.Cryptography.AesManaged"
     $aesManaged.KeySize = $KeySize
     $aesManaged.GenerateKey()
     If($AsString) {
         Return [System.Convert]::ToBase64String($aesManaged.Key)
     } Else {
         Return $AESManaged.Key
    }
 }