(PowerShell) Combine Timestamp Reply and Content File into a TimeStampData

Demonstrates how to combine a timestamp reply (RFC 3161) with a data file (any type of file) to create a TimeStampData structure (RFC 5544).

Chilkat .NET Downloads Chilkat .NET Assemblies

Add-Type -Path "C:\chilkat\ChilkatDotNet47-9.5.0-x64\ChilkatDotNet47.dll"

# This example requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

# Also see this example:
# Send a TimeStamp Request to a TimeStamp Authority and get the Response

# Load a timestamp reply file
$bdTsr = New-Object Chilkat.BinData
$success = $bdTsr.LoadFile("qa_data/tsd/sample.tsr")
if ($success -ne $true) {
    $("Failed to load timestamp reply file.")
    exit
}

# Load the tsr into an ASN.1 object.
$asnTsr = New-Object Chilkat.Asn
$success = $asnTsr.LoadEncoded($bdTsr.GetEncoded("base64"),"base64")
if ($success -ne $true) {
    $($asnTsr.LastErrorText)
    exit
}

# Get the timestamp reply as XML.
$xmlTsr = New-Object Chilkat.Xml
$xmlTsr.LoadXml($asnTsr.AsnToXml())

# The timestamp reply XML begins like this:
# We'll want to remove the 1st "sequence" subtree.

#     <?xml version="1.0" encoding="utf-8"?>
#     <sequence>
#         <sequence>       <---- Remove this sub-tree.
#             <int>00</int>
#             <sequence>
#                 <utf8>Operation Okay</utf8>
#             </sequence>
#         </sequence>
#         <sequence>   
#             <oid>1.2.840.113549.1.7.2</oid>
#             <contextSpecific tag="0" constructed="1">
#             ...

# Remove the 1st sub-tree..
$xmlTsr.RemoveChildByIndex(0)

# In this example, the data file we're combining with the timestamp into a timestampData is a .p7m.
# However, it can be any type of file (text or binary), it doesn't matter..
$bdContent = New-Object Chilkat.BinData
$success = $bdContent.LoadFile("qa_data/tsd/sample.p7m")
if ($success -ne $true) {
    $("Failed to load content file.")
    exit
}

# Begin building the TimeStampData.  
# We'll build as XML and then convert to ASN.1
$xml = New-Object Chilkat.Xml
$xml.Tag = "sequence"
$xml.UpdateChildContent("oid","1.2.840.113549.1.9.16.1.31")
$xml.UpdateAttrAt("contextSpecific",$true,"tag","0")
$xml.UpdateAttrAt("contextSpecific",$true,"constructed","1")
$xml.UpdateChildContent("contextSpecific|sequence|int","01")
$xml.UpdateChildContent("contextSpecific|sequence|octets",$bdContent.GetEncoded("base64"))
$xml.UpdateAttrAt("contextSpecific|sequence|contextSpecific",$true,"tag","0")
$xml.UpdateAttrAt("contextSpecific|sequence|contextSpecific",$true,"constructed","1")

$xContext = $xml.GetChildWithTag("contextSpecific|sequence|contextSpecific")
$xContext.AddChildTree($xmlTsr)

# Convert the XML to ASN.1
$tsd = New-Object Chilkat.Asn
$tsd.LoadAsnXml($xml.GetXml())

# Write the timestamped data to a file.
$success = $tsd.WriteBinaryDer("qa_output/sample.tsd")

# Alternatively, get the tsd ASN.1 as base64..
$tsdBase64 = $tsd.GetEncodedDer("base64_mime")
$($tsdBase64)