(PowerShell) Create a CAdES-T Signature

Demonstrates how to create a signature with an external timestamp that certifies the time of signing. This requires an online TSA (Time Stamping Authority) service that is capable of producing RFC 3161 compliant timestamps.

Note: This example requires Chilkat v9.5.0.78 or greater.

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.

$crypt = New-Object Chilkat.Crypt2

# This example will use a certificate + private key from a .pfx/.p12 file.
# On Windows systems, it is also possible to use certs on smartcards/usb tokens or certs pre-installed in the Windows registry.
$cert = New-Object Chilkat.Cert

$pfxPath = "qa_data/pfx/myCertAndKey.p12"
$pfxPassword = "test123"

$success = $cert.LoadPfxFile($pfxPath,$pfxPassword)
if ($success -ne $true) {
    $($cert.LastErrorText)
    exit
}

$success = $crypt.SetSigningCert($cert)

# Use SHA-256 rather than the default of SHA-1
$crypt.HashAlgorithm = "sha256"

# Create JSON that tells Chilkat what signing attributes to include:
$attrs = New-Object Chilkat.JsonObject
$attrs.UpdateBool("contentType",$true)
$attrs.UpdateBool("signingTime",$true)
$attrs.UpdateBool("messageDigest",$true)
$attrs.UpdateBool("signingCertificateV2",$true)

# A CAdES-T signature is one that includes a timestampToken created by an online TSA (time stamping authority).
# We must include the TSA's URL, as well as a few options to indicate what is desired.
# Except for the TSA URL, the options shown here are typically what you would need.
$attrs.UpdateBool("timestampToken.enabled",$true)
$attrs.UpdateString("timestampToken.tsaUrl","https://freetsa.org/tsr")
$attrs.UpdateBool("timestampToken.addNonce",$false)
$attrs.UpdateBool("timestampToken.requestTsaCert",$true)
$attrs.UpdateString("timestampToken.hashAlg","sha256")

$crypt.SigningAttributes = $attrs.Emit()

$inFile = "qa_data/json/sample.json"
$outFile = "qa_output/sample_cades_t.p7m"

# This creates the CAdES-T signature.  During the signature creation, it
# communicates with the TSA to get a timestampToken.
$success = $crypt.CreateP7M($inFile,$outFile)
if ($success -ne $true) {
    $($crypt.LastErrorText)
    exit
}

$("Success.")