Lianja

Sign String to create a CAdES-T Signature, using HTTP Proxy to Access Timestamp Server

This example will sign a string to create a CAdEST-T signature. It will use an HTTP proxy to access the timestamp server. Lianja

llSuccess = .F.

loCrypt = createobject("CkCrypt2")

loCert = createobject("CkCert")
loCert.SmartCardPin = "123456"
llSuccess = loCert.LoadFromSmartcard("")
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()

lcStrToSign = "Hello World!"

loBd = createobject("CkBinData")
loBd.AppendString(lcStrToSign,"utf-8")

// -------------------------------------------------------------------------
// The purpose of this example is to show how an HTTP object with custom
// settings can be used to access the Internet when signing.
// Access to the Internet is needed to communicate with the timestamp server.
loHttp = createobject("CkHttp")
// This can be a domain name, hostname, or IP address.
loHttp.ProxyDomain = "172.16.16.56"
loHttp.ProxyPort = 808
loHttp.ProxyLogin = "myProxyLogin"
loHttp.ProxyPassword = "myProxyPassword"
loCrypt.SetTsaHttpObj(loHttp)
// -------------------------------------------------------------------------

// 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
    release loHttp
    return
endif

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

? "Success."


release loCrypt
release loCert
release loAttrs
release loBd
release loHttp