PowerShell Requires Chilkat v11.0.0+

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

See more HTTP Examples

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

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

$success = $false

#  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 -eq $false) {
    $($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 = New-Object Chilkat.HttpResponse
$success = $http.HttpBd("POST",$tsaUrl,$requestToken,"application/timestamp-query",$resp)
if ($success -eq $false) {
    $($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 -eq $false) {
    $($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 = New-Object Chilkat.JsonObject
$http.GetLastJsonData($json)

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

#  The JSON looks like the following.

#  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
}