(PowerShell) RFC3161 Timestamp Client - Fetch from Timestamp Authority (TSA) and Verify

Sends an RFC 3161 timestamp request to a TSA (Timestamp Authority) server and validates the timestamp token response.

Note: This example requires Chilkat v9.5.0.75 or greater.

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

# Note: Requires Chilkat v9.5.0.75 or greater.

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

# First sha-256 hash the data that is to be timestamped.
# In this example, the data is the string "Hello World"

$crypt = New-Object Chilkat.Crypt2
$crypt.HashAlgorithm = "sha256"
$crypt.EncodingMode = "base64"
$base64Hash = $crypt.HashStringENC("Hello World")

$http = New-Object Chilkat.Http

$requestToken = New-Object Chilkat.BinData
$optionalPolicyOid = ""
$addNonce = $false
$requestTsaCert = $true

# Create a time-stamp request token
$success = $http.CreateTimestampRequest("sha256",$base64Hash,$optionalPolicyOid,$addNonce,$requestTsaCert,$requestToken)
if ($success -ne $true) {
    $($http.LastErrorText)
    exit
}

# Send the time-stamp request token to the TSA.
# This is the equivalent of the following CURL command:
# curl -H "Content-Type: application/timestamp-query" --data-binary '@file.tsq' https://freetsa.org/tsr > file.tsr
$tsaUrl = "https://freetsa.org/tsr"
# Another timestamp server you could try is: http://timestamp.digicert.com
$tsaUrl = "http://timestamp.digicert.com"
$resp = $http.PBinaryBd("POST",$tsaUrl,$requestToken,"application/timestamp-query",$false,$false)
if ($http.LastMethodSuccess -ne $true) {
    $($http.LastErrorText)
    exit
}

# Get the timestamp reply from the HTTP response object.
$timestampReply = New-Object Chilkat.BinData
$resp.GetBodyBd($timestampReply)

# Show the base64 encoded timestamp reply.
$($timestampReply.GetEncoded("base64"))

# Let's verify the timestamp reply against the TSA's cert, which we've previously downloaded.
# See https://freetsa.org/index_en.php
$tsaCert = New-Object Chilkat.Cert
$success = $tsaCert.LoadFromFile("qa_data/certs/freetsa.org.cer")
if ($success -ne $true) {
    $($tsaCert.LastErrorText)
    exit
}

# The VerifyTimestampReply method will return one of the following values:
# -1:  The timestampReply does not contain a valid timestamp reply.
# -2: The  timestampReply is a valid timestamp reply, but failed verification using the public key of the tsaCert.
# 0:  Granted and verified.
# 1: Granted and verified, with mods (see RFC 3161)
# 2: Rejected.
# 3: Waiting.
# 4: Revocation Warning
# 5: Revocation Notification
$pkiStatus = $http.VerifyTimestampReply($timestampReply,$tsaCert)
if ($pkiStatus -lt 0) {
    $($http.LastErrorText)
    exit
}

$("pkiStatus = " + $pkiStatus)

$json = $http.LastJsonData()
$json.EmitCompact = $false
$($json.Emit())

# The LastJsonData looks like the following.
# Note: The "timestampReply.pkiStatus" portion of the LastJsonData was added in Chilkat v9.5.0.83

# Use this online tool to generate parsing code from sample JSON: 
# Generate Parsing Code from JSON

# {
#   "timestampReply": {
#     "pkiStatus": {
#       "value": 0,
#       "meaning": "granted"
#     }
#   },
#   "pkcs7": {
#     "verify": {
#       "digestAlgorithms": [
#         "sha256"
#       ],
#       "signerInfo": [
#         {
#           "cert": {
#             "serialNumber": "04CD3F8568AE76C61BB0FE7160CCA76D",
#             "issuerCN": "DigiCert SHA2 Assured ID Timestamping CA",
#             "digestAlgOid": "2.16.840.1.101.3.4.2.1",
#             "digestAlgName": "SHA256"
#           },
#           "contentType": "1.2.840.113549.1.9.16.1.4",
#           "signingTime": "200405023019Z",
#           "messageDigest": "f14zOsdnN9vyyV3HjjBiLzNDi1PF28hAFMODxNkNRZs=",
#           "signingAlgOid": "1.2.840.113549.1.1.1",
#           "signingAlgName": "RSA-PKCSV-1_5",
#           "authAttr": {
#             "1.2.840.113549.1.9.3": {
#               "name": "contentType",
#               "oid": "1.2.840.113549.1.9.16.1.4"
#             },
#             "1.2.840.113549.1.9.5": {
#               "name": "signingTime",
#               "utctime": "200405023019Z"
#             },
#             "1.2.840.113549.1.9.16.2.12": {
#               "name": "signingCertificate",
#               "der": "MBowGDAWBBQDJb1QXtqWMC3CL0+gHkwovig0xQ=="
#             },
#             "1.2.840.113549.1.9.4": {
#               "name": "messageDigest",
#               "digest": "f14zOsdnN9vyyV3HjjBiLzNDi1PF28hAFMODxNkNRZs="
#             }
#           }
#         }
#       ]
#     }
#   }
# }

$signingTime = New-Object Chilkat.DtObj
$authAttrSigningTimeUtctime = New-Object Chilkat.DtObj

$timestampReplyPkiStatusValue = $json.IntOf("timestampReply.pkiStatus.value")
$timestampReplyPkiStatusMeaning = $json.StringOf("timestampReply.pkiStatus.meaning")
$i = 0
$count_i = $json.SizeOfArray("pkcs7.verify.digestAlgorithms")
while ($i -lt $count_i) {
    $json.I = $i
    $strVal = $json.StringOf("pkcs7.verify.digestAlgorithms[i]")
    $i = $i + 1
}

$i = 0
$count_i = $json.SizeOfArray("pkcs7.verify.signerInfo")
while ($i -lt $count_i) {
    $json.I = $i
    $certSerialNumber = $json.StringOf("pkcs7.verify.signerInfo[i].cert.serialNumber")
    $certIssuerCN = $json.StringOf("pkcs7.verify.signerInfo[i].cert.issuerCN")
    $certDigestAlgOid = $json.StringOf("pkcs7.verify.signerInfo[i].cert.digestAlgOid")
    $certDigestAlgName = $json.StringOf("pkcs7.verify.signerInfo[i].cert.digestAlgName")
    $contentType = $json.StringOf("pkcs7.verify.signerInfo[i].contentType")
    $json.DtOf("pkcs7.verify.signerInfo[i].signingTime",$false,$signingTime)
    $messageDigest = $json.StringOf("pkcs7.verify.signerInfo[i].messageDigest")
    $signingAlgOid = $json.StringOf("pkcs7.verify.signerInfo[i].signingAlgOid")
    $signingAlgName = $json.StringOf("pkcs7.verify.signerInfo[i].signingAlgName")
    $authAttrContentTypeName = $json.StringOf("pkcs7.verify.signerInfo[i].authAttr.`"1.2.840.113549.1.9.3`".name")
    $authAttrContentTypeOid = $json.StringOf("pkcs7.verify.signerInfo[i].authAttr.`"1.2.840.113549.1.9.3`".oid")
    $authAttrSigningTimeName = $json.StringOf("pkcs7.verify.signerInfo[i].authAttr.`"1.2.840.113549.1.9.5`".name")
    $json.DtOf("pkcs7.verify.signerInfo[i].authAttr.`"1.2.840.113549.1.9.5`".utctime",$false,$authAttrSigningTimeUtctime)
    $authAttrSigningCertificateName = $json.StringOf("pkcs7.verify.signerInfo[i].authAttr.`"1.2.840.113549.1.9.16.2.12`".name")
    $authAttrSigningCertificateDer = $json.StringOf("pkcs7.verify.signerInfo[i].authAttr.`"1.2.840.113549.1.9.16.2.12`".der")
    $authAttrMessageDigestName = $json.StringOf("pkcs7.verify.signerInfo[i].authAttr.`"1.2.840.113549.1.9.4`".name")
    $authAttrMessageDigestDigest = $json.StringOf("pkcs7.verify.signerInfo[i].authAttr.`"1.2.840.113549.1.9.4`".digest")
    $i = $i + 1
}