encryptdecrypt

0.9.0

Private/EncryptFile.ps1

                                <#

    .SYNOPSIS 

    Encrypts a file using AES.

    .DESCRIPTION

    Encrypts a file using an AES key.

    .PARAMETER FileToEncrypt

    File(s) to be encrypted

    .PARAMETER Key

    AES key to be used for encryption.

    .EXAMPLE

    $key = NewCryptographyKey -AsPlainText

    EncryptFile 'C:\file.ext' $key

    This example encrypts C:\file.ext with the key stored in the variable $key.

    .NOTES

    Author: Tyler Siegrist

    Date: 8/23/2016

    https://gallery.technet.microsoft.com/scriptcenter/EncryptDecrypt-files-use-65e7ae5d

#>

Function EncryptFile {

    Param(

       [Parameter(Mandatory=$true, Position=1)]

       [System.IO.FileInfo[]]$FileToEncrypt,

       [Parameter(Mandatory=$true, Position=2)]

       [String]$Key,

       [Parameter(Mandatory=$false, Position=3)]

       [String]$Suffix

    )

    #Load dependencies

    try {

        if ($PSVersionTable.PSEdition -eq "Core") {

            $SystemCoreAssemblyPath = $($(Get-Command pwsh).Source | Split-Path -Parent) + '\System.Core.dll'

            if (!$(Test-Path $SystemCoreAssemblyPath)) {

                Write-Error "The path '$SystemCoreAssemblyPath' was not found! Halting!"

                $global:FunctionResult = "1"

                return

            }

            $null = Add-Type -Path $SystemCoreAssemblyPath

        }

        else {

            [System.Reflection.Assembly]::LoadWithPartialName('System.Security.Cryptography')

        }

    }

    catch {

        Write-Error 'Could not load required assembly.'

        Return

    }

    #Configure AES

    try {

        $EncryptionKey = [System.Convert]::FromBase64String($Key)

        $KeySize = $EncryptionKey.Length*8

        $AESProvider = New-Object 'System.Security.Cryptography.AesManaged'

        $AESProvider.Mode = [System.Security.Cryptography.CipherMode]::CBC

        $AESProvider.BlockSize = 128

        $AESProvider.KeySize = $KeySize

        $AESProvider.Key = $EncryptionKey

    }

    catch {

        Write-Error 'Unable to configure AES, verify you are using a valid key.'

        Return

    }

    Write-Verbose "Encryping $($FileToEncrypt.Count) File(s) with the $KeySize-bit key $Key"

    #Used to store successfully encrypted file names.

    $EncryptedFiles = @()

    foreach ($File in $FileToEncrypt) {

        <#

        if ($File.Name.EndsWith($Suffix)) {

            Write-Error "$($File.FullName) already has a suffix of '$Suffix'."

            Continue

        }

        #>

        #Open file to encrypt

        try {

            $FileStreamReader = New-Object System.IO.FileStream($File.FullName, [System.IO.FileMode]::Open)

        }

        catch {

            Write-Error "Unable to open $($File.FullName) for reading."

            Continue

        }

        #Create destination file

        $DestinationFile = "$($File.FullName).aesencrypted"

        try {

            $FileStreamWriter = New-Object System.IO.FileStream($DestinationFile, [System.IO.FileMode]::Create)

        }

        catch {

            Write-Error "Unable to open $DestinationFile for writing."

            $FileStreamReader.Close()

            Continue

        }

        #Write IV length & IV to encrypted file

        $AESProvider.GenerateIV()

        $FileStreamWriter.Write([System.BitConverter]::GetBytes($AESProvider.IV.Length), 0, 4)

        $FileStreamWriter.Write($AESProvider.IV, 0, $AESProvider.IV.Length)

        Write-Verbose "Encrypting $($File.FullName) with an IV of $([System.Convert]::ToBase64String($AESProvider.IV))"

        #Encrypt file

        try {

            $Transform = $AESProvider.CreateEncryptor()

            $CryptoStream = New-Object System.Security.Cryptography.CryptoStream($FileStreamWriter, $Transform, [System.Security.Cryptography.CryptoStreamMode]::Write)

            [Int]$Count = 0

            [Int]$BlockSizeBytes = $AESProvider.BlockSize / 8

            [Byte[]]$Data = New-Object Byte[] $BlockSizeBytes

            do {

                $Count = $FileStreamReader.Read($Data, 0, $BlockSizeBytes)

                $CryptoStream.Write($Data, 0, $Count)

            }

            while ($Count -gt 0)

            #Close open files

            $CryptoStream.FlushFinalBlock()

            $CryptoStream.Close()

            $FileStreamReader.Close()

            $FileStreamWriter.Close()

            #Delete unencrypted file

            Remove-Item $File.FullName

            Write-Verbose "Successfully encrypted $($File.FullName)"

            $EncryptedFiles += $DestinationFile

        }

        catch {

            Write-Error "Failed to encrypt $($File.FullName)."

            $CryptoStream.Close()

            $FileStreamWriter.Close()

            $FileStreamReader.Close()

            Remove-Item $DestinationFile

        }

    }

    $Result = New-Object -TypeName PSObject

    $Result | Add-Member -MemberType NoteProperty -Name Computer -Value $env:COMPUTERNAME

    $Result | Add-Member -MemberType NoteProperty -Name AESKey -Value $Key

    $Result | Add-Member -MemberType NoteProperty -Name FilesEncryptedwAESKey -Value $EncryptedFiles

    return $Result

}

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