Add Base64 Encode Decode in PowerShell (#4713)

Author: rzuckerm

archive/p/powershell/Base64EncodeDecode.ps1

@@ -0,0 +1,38 @@
+function Show-Usage() {
+    Write-Host "Usage: please provide a mode and a string to encode/decode"
+    Exit 1
+}
+
+function Get-Base64Encode([string]$Str) {
+    $Bytes = [Text.Encoding]::Ascii.GetBytes($Str)
+    [Convert]::ToBase64String($Bytes)
+}
+
+function Get-Base64Decode([string]$Str) {
+    $Bytes = [Convert]::FromBase64String($Str)
+    [Text.Encoding]::Ascii.GetString($Bytes)
+}
+
+if ($args.Length -lt 2 -or -not $args[1]) {
+    Show-Usage
+}
+
+$Mode = $args[0]
+$Str = $args[1]
+switch ($Mode) {
+    "encode" {
+        $Result = Get-Base64Encode($Str)
+    }
+    "decode" {
+        try {
+            $Result = Get-Base64Decode($Str)
+        } catch [Management.Automation.MethodInvocationException] {
+            Show-Usage
+        }
+    }
+    default {
+        Show-Usage 
+    }
+}
+
+Write-Host $Result