# Purpose: Encode Powershell scripts/functions into Base64. Useful when copying scripts to clipboard to paste in RDP sessions.

# Author: Sam Granger

# Version: 2016.08.23

# ToRun Set-ExecutionPolicy -Scope CurrentUser -ExecutionPolicy Bypass -Force

##############

## INIT ##

##############

Param( [string]$scriptPath,

[string]$outputPath,

[int]$splitBy

)

Set-StrictMode -version 2

$date = Get-Date -format yyyy-MM-dd-HHmmss

$thisscriptname = $MyInvocation.MyCommand.Name

$username = $env:username

$VERSION = "2016.08.23"

##################

## Static ##

##################

$firstLine = "`$base64 = `"`""

$lastLine1 = "[string]`$UTF8 = `$([System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String(`"`$base64`")) -split(`"``n`") | foreach {[System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String(`"`$_`"))}) -join(`"``n`")"

$lastLine2 = "Invoke-Expression `$UTF8"

##################

## FUNCTIONS ##

##################

function usage {

Write-Host -foregroundcolor "yellow" "Usage : $thisscriptname"

Write-Host -foregroundcolor "yellow" " -scriptPath 'path-to-script-to-convert'"

Write-Host -foregroundcolor "yellow" " [-outputPath 'path-to-output-encoded-script (default: scriptPath)]'"

Write-Host -foregroundcolor "yellow" " [-splitBy 'no.-of-lines-to-split-base64-by' (default: 5)]"

Write-Host

Write-Host

Write-Host -foregroundcolor "yellow" "Example: .\$thisscriptname -scriptPath "".\myscript.ps1"" ";

}

###################

## MAIN ##

###################

#Check if parameters are supplied

if (!($scriptPath)) {

usage;

exit 1

}

if (!($outputPath)) {

$outputPath = Split-Path $scriptPath;

}

#Default to '5' if no splitby Lenght specified

if (!($splitBy)) {

$splitBy = 5}

#Create outputFile name

$scriptName = (Get-Item $scriptPath).Basename

$outputFile = "$outputPath\$($scriptName)_base64.ps1"

Write-Host "[*] Base64 encoding '$scriptPath' to '$outputFile"

#Import Script

Write-host "[*] Importing script"

$importScript = Get-Content $scriptPath -encoding UTF8

#Convert each line to base64

$base64Script = @()

foreach ($line in $importScript) {

$base64Script += [System.Convert]::ToBase64String([System.Text.Encoding]::UTF8.GetBytes($line))

}

#Convert entire script to base64

Write-Host "[*] Converting to Base64"

$base64ScriptToString = $base64Script -join("`n") #Convert varible to string

$base64Long = [System.Convert]::ToBase64String([System.Text.Encoding]::UTF8.GetBytes($base64ScriptToString))

#Get length of base64 encoding

$lenTotal = $base64Long.Length

$lenSplit = [math]::round($lenTotal/$splitBy) + 1

Write-Host "[!] Base64 Length: $lenTotal `t Split No.: $splitBy `t Split Size: $lenSplit"

#Write first line of file

Write-Host "[*] Preparing output file"

$firstLine | Out-File $outputFile

Write-Host "[*] Splitting file out to '$outputFile'"

$endLength = -1

foreach($i in 1..$splitBy) {

$splitMulti = $splitBy - $i

$startLength = $endLength + 1

$endLength = $lenTotal - $($lenSplit*$splitMulti)

Write-Host "Start Length: $startLength `t End Length: $endLength `t i:$i"

$splitText = $base64Long[$startLength..$endLength] -join("")

"`$base64 += `"$splitText`"" | Out-File -append $outputFile

$i++

}

Write-Host "[*] Finalizing output file"

$lastLine1 | Out-File -append $outputFile

$lastLine2 | Out-File -append $outputFile

#Done

Write-Host "[**] Done"