Encryption.psm1

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#region Decrypt-File
function Decrypt-File
{
    <#
    .Synopsis
       Decrypt a file.
    .DESCRIPTION
       Decrypt a file using EFS.
    .EXAMPLE
       Decrypt-File -Path .\test.txt
 
       This command will decrypt the test.txt file.
    #>


    [CmdletBinding(SupportsShouldProcess=$true, 
                  PositionalBinding=$false,
                  ConfirmImpact='Medium')]
    [Alias()]
    [OutputType([String[]])]
    Param
    (
        # The path to the file to be encrypted
        [Parameter(Mandatory=$true, 
                   ValueFromPipeline=$true,
                   ValueFromPipelineByPropertyName=$true, 
                   Position=0)]
        [ValidateNotNull()]
        [ValidateNotNullOrEmpty()]
        [Alias("File")] 
        [string[]]$Path
    )

    Begin{}
    
    Process
    {
        foreach($p in $Path)
        {
            if( (Test-Path -Path $p))
            {
                if ($pscmdlet.ShouldProcess($p))
                {
                    $fullPath = (Resolve-Path $p).Path
                    Write-Verbose "Decrypting file $p"
                    [System.IO.file]::Decrypt($fullPath)
                }
            }
            else
            {
                Throw "Could not find file $p"
            }
        }
    }

    End{}
}
#endregion

#region Encrypt-File
function Encrypt-File
{
    <#
    .Synopsis
       Encrypt a file.
    .DESCRIPTION
       Encrypt a file using EFS.
    .EXAMPLE
       Encrypt-File -Path .\test.txt
 
       This command will encrypt the file test.txt.
    #>


    [CmdletBinding(SupportsShouldProcess=$true, 
                  PositionalBinding=$false,
                  ConfirmImpact='Medium')]
    [Alias()]
    [OutputType([String[]])]
    Param
    (
        # The path to the file to be encrypted
        [Parameter(Mandatory=$true, 
                   ValueFromPipeline=$true,
                   ValueFromPipelineByPropertyName=$true, 
                   Position=0)]
        [ValidateNotNull()]
        [ValidateNotNullOrEmpty()]
        [Alias("File")] 
        [string[]]$Path
    )

    Begin{}
    
    Process
    {
        foreach($p in $Path)
        {
            if( (Test-Path -Path $p))
            {
                if ($pscmdlet.ShouldProcess($p))
                {
                    $fullPath = (Resolve-Path $p).Path
                    Write-Verbose "Encrypting file $p"
                    [System.IO.file]::Encrypt($fullPath)
                }
            }
            else
            {
                Throw "Could not find file $p"
            }
        }
    }

    End{}
}
#endregion

#region Decrypt-Folder
function Decrypt-Folder
{
    <#
    .Synopsis
       Decrypt a folder.
    .DESCRIPTION
       Decrypt a folder encrypted with EFS.
    .EXAMPLE
       Decrypt-Folder -Path .\Test
 
       This command will decrypt the folder Test.
    .EXAMPLE
       Decrypt-Folder -Path .\Test -Recurse
 
       This command will decrypt the folder test and all subfolders and files recursively.
    #>


    [CmdletBinding(SupportsShouldProcess=$true, 
                  PositionalBinding=$false,
                  ConfirmImpact='Medium')]
    [Alias()]
    [OutputType([String[]])]
    Param
    (
        # The path to the file to be encrypted
        [Parameter(Mandatory=$true, 
                   ValueFromPipeline=$true,
                   ValueFromPipelineByPropertyName=$true, 
                   Position=0)]
        [ValidateNotNull()]
        [ValidateNotNullOrEmpty()]
        [Alias("File")] 
        [string[]]$Path,

        [switch]$Recurse
    )

    Begin{}
    
    Process
    {
        foreach($p in $Path)
        {
            if( (Test-Path -Path $p))
            {
                if ($pscmdlet.ShouldProcess($p))
                {
                    $fullPath = (Resolve-Path $p).Path
                    Write-Verbose "Decrypting folder $p"
                    [System.IO.file]::Decrypt($fullPath)

                    if($Recurse)
                    {
                        Write-Verbose "Decrypting subfolders and files"
                        Get-ChildItem -Path $fullPath -Directory -Force |
                            %{
                                Decrypt-Folder -Path $_.FullName -Recurse
                            }

                        Get-ChildItem -Path $fullPath -File -Force |
                            %{
                                Decrypt-File -Path $_.FullName
                            }
                    }                    
                }
            }
            else
            {
                Throw "Could not find folder $p"
            }
        }
    }

    End{}
}
#endregion

#region Encrypt-Folder
function Encrypt-Folder
{
    <#
    .Synopsis
       Encrypt a folder.
    .DESCRIPTION
       Encrypt a folder using EFS.
    .EXAMPLE
       Encrypt-Folder -Path .\Test
 
       This command will encrypt the folder Test.
    .EXAMPLE
       Encrypt-Folder -Path .\Test -Recurse
 
       This command will encrypt the folder Test and all subfolders and files recursively.
    #>


    [CmdletBinding(SupportsShouldProcess=$true, 
                  PositionalBinding=$false,
                  ConfirmImpact='Medium')]
    [Alias()]
    [OutputType([String[]])]
    Param
    (
        # The path to the file to be encrypted
        [Parameter(Mandatory=$true, 
                   ValueFromPipeline=$true,
                   ValueFromPipelineByPropertyName=$true, 
                   Position=0)]
        [ValidateNotNull()]
        [ValidateNotNullOrEmpty()]
        [Alias("Folder")] 
        [string[]]$Path,

        [switch]$Recurse
    )

    Begin{}
    
    Process
    {
        foreach($p in $Path)
        {
            if( (Test-Path -Path $p))
            {
                if ($pscmdlet.ShouldProcess($p))
                {
                    $fullPath = (Resolve-Path $p).Path
                    Write-Verbose "Encrypting folder $p"
                    [System.IO.file]::Encrypt($fullPath)

                    if($Recurse)
                    {
                        Write-Verbose "Encrypting subfolders and files"
                        Get-ChildItem -Path $fullPath -Directory -Force |
                            %{
                                Encrypt-Folder -Path $_.FullName -Recurse
                            }

                        Get-ChildItem -Path $fullPath -File -Force |
                            %{                          
                                Encrypt-File -Path $_.FullName
                            }
                    }                    
                }
            }
            else
            {
                Throw "Could not find folder $p"
            }
        }
    }

    End{}
}
#endregion

#region Exports
Export-ModuleMember -Function Encrypt-File
Export-ModuleMember -Function Decrypt-File
Export-ModuleMember -Function Encrypt-Folder
Export-ModuleMember -Function Decrypt-Folder
#endregion