EncodeDecodeToFromBase64.ps1
|
<#PSScriptInfo
.VERSION 1.0 .GUID 0c680374-770b-4ec8-a924-ab9bdb1c4ace .AUTHOR Sammy .COMPANYNAME Microsoft Canada .COPYRIGHT Free (I took and enhanced it from some forum discussion) .TAGS Base64, Encode, Decode, String .PROJECTURI https://github.com/SammyKrosoft/Encode-File-to-Base64-String-And-Decode .RELEASENOTES N/A #> <# .DESCRIPTION This script contains functions to encode and decode files in and from Base64 .EXAMPLE EncodeBase64ToFile -FilePath "$($env:USERPROFILE)\Downloads\MyFile.exe" -Compress -Verbose Will encode the file specified in the current users's Downloads folder, and compress it .EXAMPLE DecodeBase64StringFromFile -FilePathContainingBase64Code $DestBase64EncodedFile -DestinationFile $FileName #> Write-Host "You now have 2 functions you can use in this PowerShell session:" WRite-Host "EncodeBase64ToFile -FilePath <path of the file to encode in Base64> [-Compress] [-DestinationBase64StringFile <Path of the destination Base64 file (Optional - will generate from original file name if not specified)>]" -ForegroundColor Yellow Write-Host "DecodeBase64StringFromFile -FilePAthContainingBase64Code <Path of the file to decode> [-DestinationFile <Path of the destination file (optional - will generate from Base64 file name if not specified)>]" -ForegroundColor Yellow Write-Host "Usage:" Write-Host "----------------------------------------------------------------------------------------------------------------------" Write-Host "To encode a file (EXE, JPG, whatever) to a Base64 string in a file:" Write-Host " -> EncodeBase64ToFile -FilePath c:\temp\myExecutable.exe" -ForegroundColor Yellow Write-Host " => will encode the ""myExecutable.exe"" file" Write-Host " into a base64 file named myExecutableexe.txt (extension merged in the file name, and appended "".txt"" new" Write-Host " extension." Write-Host "-----------------------------------------------------------------------------------------------------------------------" Write-Host "To decode a previously Base64 encoded file into its original form:" Write-Host " -> DecodeBase64StringFromFile -FilePathContainingBase64Code c:\temp\myExecutableexe.txt" -ForegroundColor Yellow Write-Host " => will decode the ""myExecutableexe.txt"" (note the ""exe"" substring in the file name) and rename it to ""myExecutable.exe"" " Function EncodeBase64ToFile { [CmdletBinding()] Param( [Parameter(Mandatory = $true, Position = 0)][String] $FilePath , [Parameter(Mandatory = $false)][String]$DestinationBase64StringFile, # Optionnally compress the Base64 file [Parameter(Mandatory = $false)][Switch]$Compress ) #SamHeader $StopWatch = [System.Diagnostics.Stopwatch]::StartNew() If(!(Test-Path $FilePath)){ Write-Host "File specified $FilePath not found ... please use an existing file path and try again !" -ForegroundColor Yellow -BackgroundColor Red $StopWatch.Stop() $StopWatch.Elapsed | Fl TotalSeconds Exit } If ($DestinationBase64StringFile -eq "" -or $DestinationBase64StringFile -eq $Null) { Write-Verbose "-DestinationBase64StringFile not specified ... constructing with current file name specified: $FilePath" $strFileName = (Get-Item $FileName).Name $strFileNameOneWord = $strFileName -join "\." $DestinationBase64StringFile = $strFileNameOneWord + ".txt" Write-Verbose "-DestinationBase64StringFile constructed from $FilePath : $DestinationBase64StringFile" } Write-Verbose "Beginning TRY sequence with current options -Filepath $FilePath and -DestinationBase64StringFile $DestinationBase64StringFile ..." Try { Write-Verbose "Trying to convert file specified to Base64 string... it can be long if the file you try to encode is big !" $Base64String = [Convert]::ToBase64String([IO.File]::ReadAllBytes($FilePath)) Write-Verbose "Finished converting with success !" Write-Verbose "Pouring the Base64 generated code into the destination file $($env:userprofile)\Documents\$DestinationBase64StringFile" Set-Content -Value $Base64String -Path "$($env:userprofile)\Documents\$DestinationBase64StringFile" Write-Host "Done !" -ForegroundColor Green } Catch { Write-Verbose "Something went wrong ... We're in the CATCH section ..." Write-Host "Something went wrong :-(" -ForegroundColor Yellow -BackgroundColor Red } If ($Compress){ Write-Verbose "Specified the -Compress parameter, compressing file... " $CompressArchiveFileName = "$($Env:USERPROFILE)\Documents\$($DestinationBase64StringFile)_$(Get-Date -F ddMMMyyyy_hhmmss).zip" Write-Verbose "Entering TRY sequence to try to compress the Base64 file to $CompressArchiveFileName" Try { Write-Verbose "Trying to compress (REQUIRES POWERSHELL 5 and above !!)..." Compress-Archive -LiteralPath $DestinationBase64StringFile -DestinationPath $CompressArchiveFileName -CompressionLevel Optimal -Force Write-Verbose "File successfully compressed to $CompressArchiveFileName !" } Catch { Write-Verbose "Something happened ... unable to compress the file or to write the destination for compression..." Write-Host "Unable to compress to $CompressArchiveFileName ... " } } $StopWatch.Stop() $StopWatch.Elapsed | Fl TotalSeconds } Function DecodeBase64StringFromFile { [CmdletBinding()] param ( [Parameter(Mandatory = $True, Position = 0)] [String] $FilePathContainingBase64Code, [Parameter(Mandatory = $true, Position = 1)] [String] $DestinationFile ) $StopWatch = [System.Diagnostics.Stopwatch]::StartNew() If(!(Test-Path $FilePathContainingBase64Code)){ Write-Host "File specified $FilePathContainingBase64Code not found ... please use an existing file path and try again !" -ForegroundColor Yellow -BackgroundColor Red $StopWatch.Stop() $StopWatch.Elapsed | Fl TotalSeconds Exit } # Below sequence transforms a file name previously converted with EncodeBase64ToFile PowerShell function into the filename extension # Note that the first thing we do is removing the .txt extension (4 last characters) and then the last 3 letters are the file extension # and the other letters are the file name withtou the extension... and finally we re-build the file name by concatenating # the file name without extension, with a dot, with the extension (3 last letters) # Example : $FilePathContainingBase64Code = "Timberexe.txt" that will become Timberexe, then Timber, then Timber.exe if ($DestinationFile -eq "" -or $DestinationFile -eq $null){ Write-Verbose "-DestinationFile parameter not specified ... constructing with current Base64 file name specified: $FilePathContainingBase64Code" $FilePathContainingBase64Code = $FilePathContainingBase64Code.Substring(0,$FilePathContainingBase64Code.Length - 4) $DestinationFileExtension = $FilePathContainingBase64Code.Substring($FilePathContainingBase64Code.Length - 3) $DestinationFileNameWithoutExtension = $FilePathContainingBase64Code.Substring(0, $FilePathContainingBase64Code.Length - 3) $DestinationFile = $DestinationFileNameWithoutExtension + "." + $DestinationFileExtension Write-Verbose "Destination file constructed: $DestinationFile" } Else { Write-Verbose "-DestinationFile parameter specified : $DestinationFile" } Write-Verbose "Beginning TRY sequence with parameters specified -FilePathContainingBase64Code as $FilePathContainingBase64Code and -DestinationFile as $DestinationFile" Try { Write-Verbose "Trying to read the Base 64 content from file specified : $FilePathContainingBase64Code" $Base64Content = Get-Content -Path $FilePathContainingBase64Code [IO.File]::WriteAllBytes($DestinationFile, [Convert]::FromBase64String($Base64Content)) Write-Host "Success ! File written: $DestinationFile" -BackgroundColor Green -ForegroundColor Black } Catch { Write-Verbose "Something went wrong ... We're in the CATCH section..." Write-Host "Something went wrong :-(" -ForegroundColor Yellow -BackgroundColor Red } $StopWatch.Stop() $StopWatch.Elapsed | fl TotalSeconds } |