(PowerShell) Extract a File from a .p7m (PKCS7 Signed-Data)

PowerShell example to extract the original file from a .p7m (Signed-Data PKCS7 Format) The .p7m contains the signed contents of the original file. It can be verified and restored by calling VerifyP7M.

Download: Chilkat .NET Assemblies

[Reflection.Assembly]::LoadFile("C:\myAssemblies\ChilkatDotNet2.dll")

$crypt = New-Object Chilkat.Crypt2

#  Any string argument automatically begins the 30-day trial.
$success = $crypt.UnlockComponent("30-day trial")
if ($success -ne $true) {
    $($crypt.LastErrorText)
    exit
}

$outFile = "/Users/chilkat/testData/pdf/sample.pdf"
$inFile = "/Users/chilkat/testData/p7m/sample.pdf.p7m"

#  Verify and restore the original file:
$success = $crypt.VerifyP7M($inFile,$outFile)
if ($success -eq $false) {
    $($crypt.LastErrorText)
    exit
}

$("Success!")