updated parameters and better question asking for rsa/ecc

csr.ps1

@@ -1,13 +1,33 @@
 param(
-    $rsa,
+    [switch]$rsa,
+    [switch]$ecc,
     $hostnames
 )
 
-if (-not $PSBoundParameters.ContainsKey('rsa')) {
-    $test = read-host "Do you want a RSA (r) or EEC (e) cert? (e/r)"
+function Get-RSAorECC {
+    [cmdletbinding()]
+    param(
+        [Parameter(Mandatory)]
+        [string]$title, 
+        [Parameter(Mandatory)]
+        [string]$question
+    )
 
-    if ($test -eq "r") {
-        $rsa = $True        
+    # list of choices for the user
+    $choices  = '&RSA', '&ECC'
+    # prompt the user to confirm
+    $decision = $Host.UI.PromptForChoice($title, $question, $choices, 1)
+    # return value if 0, user entered r for RSA
+    if ($decision -eq 0) {
+        return "RSA"
+    } else {
+        return "ECC"
+    }
+}
+
+if (-not $rsa -and -not $ecc) {
+    if ($(Get-RSAorECC) -eq "RSA") {
+        $rsa = $true        
     }
 }