(Xojo Plugin) Sign String to create a CAdES-T Signature

This example will sign a string to create a CAdEST-T signature.

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

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

Dim crypt As New Chilkat.Crypt2

// This example will use the certificate + private key currently inserted into a smartcard reader.
Dim cert As New Chilkat.Cert

// If we wish to provide the smartcard PIN (otherwise the user will be prompted by the operating system).
cert.SmartCardPin = "000000"
Dim success As Boolean
success = cert.LoadFromSmartcard("")
If (success <> True) Then
    System.DebugLog(cert.LastErrorText)
    Return
End If

// Note: It is also possible to use certs from .pfx/.p12, .pem, or other sources such as 
// pre-installed Windows certificates.

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:
Dim attrs As New Chilkat.JsonObject
success = attrs.UpdateBool("contentType",True)
success = attrs.UpdateBool("signingTime",True)
success = attrs.UpdateBool("messageDigest",True)
success = 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.
success = attrs.UpdateBool("timestampToken.enabled",True)
success = attrs.UpdateString("timestampToken.tsaUrl","https://freetsa.org/tsr")
success = attrs.UpdateBool("timestampToken.addNonce",False)
success = attrs.UpdateBool("timestampToken.requestTsaCert",True)
success = attrs.UpdateString("timestampToken.hashAlg","sha256")

crypt.SigningAttributes = attrs.Emit()

Dim strToSign As String
strToSign = "THIS IS MY ID"

Dim bd As New Chilkat.BinData
success = bd.AppendString(strToSign,"utf-8")

// This creates the CAdES-T signature.  During the signature creation, it
// communicates with the TSA to get a timestampToken.
// The contents of bd are signed and replaced with the CAdES-T signature (which embeds the original content).
success = crypt.OpaqueSignBd(bd)
If (success <> True) Then
    System.DebugLog(crypt.LastErrorText)
    Return
End If

// Get the signature in base64 format:
System.DebugLog(bd.GetEncoded("base64_mime"))

// Or save the signature to a file.
success = bd.WriteFile("qa_output/cades-t_sample.p7m")

System.DebugLog("Success.")