Java

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. Java

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    boolean success = false;

    CkCrypt2 crypt = new CkCrypt2();

    CkCert cert = new CkCert();
    cert.put_SmartCardPin("123456");
    success = cert.LoadFromSmartcard("");
    if (success != true) {
        System.out.println(cert.lastErrorText());
        return;
        }

    success = crypt.SetSigningCert(cert);

    //  Use SHA-256 rather than the default of SHA-1
    crypt.put_HashAlgorithm("sha256");

    //  Create JSON that tells Chilkat what signing attributes to include:
    CkJsonObject attrs = new CkJsonObject();
    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.put_SigningAttributes(attrs.emit());

    String strToSign = "Hello World!";

    CkBinData bd = new CkBinData();
    bd.AppendString(strToSign,"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.
    CkHttp http = new CkHttp();
    //  This can be a domain name, hostname, or IP address.
    http.put_ProxyDomain("172.16.16.56");
    http.put_ProxyPort(808);
    http.put_ProxyLogin("myProxyLogin");
    http.put_ProxyPassword("myProxyPassword");
    crypt.SetTsaHttpObj(http);
    //  -------------------------------------------------------------------------

    //  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) {
        System.out.println(crypt.lastErrorText());
        return;
        }

    //  Get the signature in base64 format:
    System.out.println(bd.getEncoded("base64_mime"));

    System.out.println("Success.");
  }
}