(Java) Sign Manifest File to Generate a Passbook .pkpass in Memory

Demonstrates how to create a Passbook .pkpass archive by creating a signature of a manifest file and then zipping to a .pkpass archive in memory

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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[])
  {
    // This requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // ---------------------------------------------------------------------------------------------
    // This example is the same as Sign Manifest File to Generate a Passbook .pkpass file
    // except everything happens in memory (no input files, no output files)
    // ---------------------------------------------------------------------------------------------

    // First create the manifest.json
    boolean success;
    CkJsonObject manifest = new CkJsonObject();
    CkCrypt2 crypt = new CkCrypt2();

    CkZip zip = new CkZip();
    zip.NewZip("notUsedAndNeverCreated.zip");

    crypt.put_HashAlgorithm("sha1");
    // Return hashes as lowercase hex.
    crypt.put_EncodingMode("hexlower");

    String digestStr;

    CkBinData pngData = new CkBinData();
    // Assume we load the pngData with bytes for "icon.png" from somewhere, such as a byte array in memory.
    CkZipEntry entry = zip.AppendBd("icon.png",pngData);

    digestStr = crypt.hashBdENC(pngData);
    manifest.UpdateString("\"icon.png\"",digestStr);

    pngData.Clear();
    // Assume we load the pngData with bytes for "icon@2x.png" from somewhere...
    entry = zip.AppendBd("icon@2x.png",pngData);

    digestStr = crypt.hashBdENC(pngData);
    manifest.UpdateString("\"icon@2x.png\"",digestStr);

    pngData.Clear();
    // Assume we load the pngData with bytes for "logo.png" from somewhere...
    entry = zip.AppendBd("logo.png",pngData);

    digestStr = crypt.hashBdENC(pngData);
    manifest.UpdateString("\"logo.png\"",digestStr);

    pngData.Clear();
    // Assume we load the pngData with bytes for "logo@2x.png" from somewhere...
    entry = zip.AppendBd("logo@2x.png",pngData);

    digestStr = crypt.hashBdENC(pngData);
    manifest.UpdateString("\"logo@2x.png\"",digestStr);

    String passJson = "{ .... }";    //  Contains the contents of pass.json
    entry = zip.AppendString("pass.json",passJson);

    digestStr = crypt.hashStringENC(passJson);
    manifest.UpdateString("\"pass.json\"",digestStr);

    entry = zip.AppendString("manifest.json",manifest.emit());

    // Make sure we have the Apple WWDR intermediate certificate available for 
    // the cert chain in the signature.
    CkXmlCertVault certVault = new CkXmlCertVault();
    CkCert appleWwdrCert = new CkCert();
    success = appleWwdrCert.LoadByCommonName("Apple Worldwide Developer Relations Certification Authority");
    if (success != true) {
        System.out.println("The Apple WWDR intermediate certificate is not installed.");
        System.out.println("It is available at https://developer.apple.com/certificationauthority/AppleWWDRCA.cer");
        System.out.println("You may alternatively load the .cer like this...");
        success = appleWwdrCert.LoadFromFile("qa_data/certs/AppleWWDRCA.cer");
        if (success != true) {
            System.out.println(appleWwdrCert.lastErrorText());
            return;
            }

        }

    certVault.AddCert(appleWwdrCert);
    crypt.UseCertVault(certVault);

    // Use a digital certificate and private key from a PFX
    CkBinData bdPfx = new CkBinData();
    // Assume we loaded a PFX into bdPfx....
    String pfxPassword = "test123";

    CkCert cert = new CkCert();
    success = cert.LoadPfxBd(bdPfx,pfxPassword);
    if (success != true) {
        System.out.println(cert.lastErrorText());
        return;
        }

    // Provide the signing cert (with associated private key).
    success = crypt.SetSigningCert(cert);
    if (success != true) {
        System.out.println(crypt.lastErrorText());
        return;
        }

    // Specify the signed attributes to be included.
    // (These attributes appear to not be necessary, but we're including
    // them just in case they become necessary in the future.)
    CkJsonObject jsonSignedAttrs = new CkJsonObject();
    jsonSignedAttrs.UpdateInt("contentType",1);
    jsonSignedAttrs.UpdateInt("signingTime",1);
    crypt.put_SigningAttributes(jsonSignedAttrs.emit());

    // Sign the manifest JSON to produce a signature
    crypt.put_EncodingMode("base64");
    String sig = crypt.signStringENC(manifest.emit());
    CkBinData bdSig = new CkBinData();
    bdSig.AppendEncoded(sig,"base64");
    entry = zip.AppendBd("signature",bdSig);

    // ---------------------------------------------------------------------------------------------
    // Note: Chilkat also has the capability to do everything in-memory (no files would be involved).  
    // If this is of interest, please send email to support@chilkatsoft.com
    // ---------------------------------------------------------------------------------------------

    // Create the .pkipass archive (which is a .zip archive containing the required files).
    // the .zip is written to bdZip
    CkBinData bdZip = new CkBinData();
    success = zip.WriteBd(bdZip);
    if (success != true) {
        System.out.println(zip.lastErrorText());
        return;
        }

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