(Lianja) 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.

loCrypt = createobject("CkCrypt2")

// This example will use the certificate + private key currently inserted into a smartcard reader.
loCert = createobject("CkCert")

// If we wish to provide the smartcard PIN (otherwise the user will be prompted by the operating system).
loCert.SmartCardPin = "000000"
llSuccess = loCert.LoadFromSmartcard("")
if (llSuccess <> .T.) then
    ? loCert.LastErrorText
    release loCrypt
    release loCert
    return
endif

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

llSuccess = loCrypt.SetSigningCert(loCert)

// Use SHA-256 rather than the default of SHA-1
loCrypt.HashAlgorithm = "sha256"

// Create JSON that tells Chilkat what signing attributes to include:
loAttrs = createobject("CkJsonObject")
loAttrs.UpdateBool("contentType",.T.)
loAttrs.UpdateBool("signingTime",.T.)
loAttrs.UpdateBool("messageDigest",.T.)
loAttrs.UpdateBool("signingCertificateV2",.T.)

// 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.
loAttrs.UpdateBool("timestampToken.enabled",.T.)
loAttrs.UpdateString("timestampToken.tsaUrl","https://freetsa.org/tsr")
loAttrs.UpdateBool("timestampToken.addNonce",.F.)
loAttrs.UpdateBool("timestampToken.requestTsaCert",.T.)
loAttrs.UpdateString("timestampToken.hashAlg","sha256")

loCrypt.SigningAttributes = loAttrs.Emit()

lcStrToSign = "THIS IS MY ID"

loBd = createobject("CkBinData")
loBd.AppendString(lcStrToSign,"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).
llSuccess = loCrypt.OpaqueSignBd(loBd)
if (llSuccess <> .T.) then
    ? loCrypt.LastErrorText
    release loCrypt
    release loCert
    release loAttrs
    release loBd
    return
endif

// Get the signature in base64 format:
? loBd.GetEncoded("base64_mime")

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

? "Success."


release loCrypt
release loCert
release loAttrs
release loBd