Lianja

Create a CAdES-T Signature

See more CAdES Examples

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.

Lianja

llSuccess = .F.

// 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 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.
loCert = createobject("CkCert")

lcPfxPath = "qa_data/pfx/myCertAndKey.p12"
lcPfxPassword = "test123"

llSuccess = loCert.LoadPfxFile(lcPfxPath,lcPfxPassword)
if (llSuccess <> .T.) then
    ? loCert.LastErrorText
    release loCrypt
    release loCert
    return
endif

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()

lcInFile = "qa_data/json/sample.json"
lcOutFile = "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.
llSuccess = loCrypt.CreateP7M(lcInFile,lcOutFile)
if (llSuccess <> .T.) then
    ? loCrypt.LastErrorText
    release loCrypt
    release loCert
    release loAttrs
    return
endif

? "Success."


release loCrypt
release loCert
release loAttrs