Update-Signature.ps1

#Requires -Modules Microsoft.PowerShell.Security
function Update-Signature {
<#
.SYNOPSIS

Updates the digital signature of PowerShell scripts.


.DESCRIPTION

Updates the digital signature of PowerShell scripts.

You can either sign all scripts in a given folder or only individual files.


.EXAMPLE

Update-Signature C:\scripts\myScript.ps1

Signs the specified script with the default certificate and timestamps it.


.EXAMPLE

Update-Signature C:\scripts\*.*

Signs the all scripts in the specified folder with the default certificate and timestamps it.


#>
[CmdletBinding(
    SupportsShouldProcess = $true
	,
    ConfirmImpact = 'Low'
	,
	DefaultParameterSetName = 'path'
)]
PARAM
(
	# The path to script files to sign
	[ValidateScript( { Test-Path($_) -PathType Container; } )]
	[Parameter(Mandatory = $false, ParameterSetName = 'path')]
	[System.IO.DirectoryInfo] $Path = $PWD.Path
	,
	# A script file or array of script files to sign
	[ValidateScript( { if($_) { foreach($item in $_) {Test-Path($item) -PathType Leaf -Include $IncludeExtensions; } } else { $true } } )]
	[Parameter(Mandatory = $true, Position = 0, ValueFromPipeline = $true, ParameterSetName = 'file')]
	[AllowNull()]
	[Alias('File')]
	$InputObject
	,
	# The certificate to use for signing the specified scripts
	[Parameter(Mandatory = $false, Position = 1)]
	# $Cert = (Select-Object -First 1 -InputObject (Get-ChildItem -Path cert:\CurrentUser\my -CodeSigningCert))
	$Cert = (Get-ChildItem -Path cert:\CurrentUser\my -CodeSigningCert | Select-Object -First 1)
	,
	# Specify wheter to timestamp (countersign) the script files
	[Parameter(Mandatory = $false)]
	[Alias('TimeStamp')]
	[switch] $CounterSign = $true
	,
	# The timestamp server url
	[Parameter(Mandatory = $false, Position = 2)]
	[Uri] $TimestampServer = 'http://timestamp.globalsign.com/scripts/timstamp.dll'
	,
	# File extensions of the script files to sign
	[Parameter(Mandatory = $false)]
	$IncludeExtensions = @('*.ps1','*.psm1','*.psd1','*.dll','*.exe')
	,
	# Specifies whether to force an update of the signature 
	# even if the existing signature is still valid.
	[Parameter(Mandatory = $false)]
	[switch] $Force = $false
)

if($PSCmdlet.ParameterSetName -eq 'path')
{
	$InputObjectTemp = (Get-ChildItem $Path -Include $IncludeExtensions -Recurse | Get-AuthenticodeSignature |? { ($_.Status -eq 'HashMismatch') -Or (($_.TimeStamperCertificate -eq $null) -And ($_.Status -eq 'Valid')) }).Path;
	if($InputObjectTemp)
	{
		$InputObject = $InputObjectTemp;
		Remove-Variable InputObjectTemp;
	}
}
foreach($Object in $InputObject)
{
	if(!$PSCmdlet.ShouldProcess($Object))
	{
		continue;
	}
	$IsValid = (Get-AuthenticodeSignature $Object | Select Status).Status -eq 'Valid';
	if(!$IsValid -Or $Force)
	{
		if($CounterSign)
		{
			Set-AuthenticodeSignature $Object -Certificate $cert -TimestampServer $TimestampServer -Confirm:$false;
		}
		else
		{
			Set-AuthenticodeSignature $Object -Certificate $cert -Confirm:$false;
		}
	}
}

} # function

if($MyInvocation.ScriptName) { Export-ModuleMember -Function Update-Signature; } 

# 
# Copyright 2014-2015 d-fens GmbH
# 
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
# 
# http://www.apache.org/licenses/LICENSE-2.0
# 
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# 

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# SIG # End signature block