(C# UWP/WinRT) 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

Chilkat Universal Windows Platform (UWP) / WinRT Downloads Chilkat for the Universal Windows Platform (UWP)

// 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
bool success;
Chilkat.JsonObject manifest = new Chilkat.JsonObject();
Chilkat.Crypt2 crypt = new Chilkat.Crypt2();

Chilkat.Zip zip = new Chilkat.Zip();
zip.NewZip("notUsedAndNeverCreated.zip");

crypt.HashAlgorithm = "sha1";
// Return hashes as lowercase hex.
crypt.EncodingMode = "hexlower";

string digestStr;

Chilkat.BinData pngData = new Chilkat.BinData();
// Assume we load the pngData with bytes for "icon.png" from somewhere, such as a byte array in memory.
Chilkat.ZipEntry 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.
Chilkat.XmlCertVault certVault = new Chilkat.XmlCertVault();
Chilkat.Cert appleWwdrCert = new Chilkat.Cert();
success = appleWwdrCert.LoadByCommonName("Apple Worldwide Developer Relations Certification Authority");
if (success != true) {
    Debug.WriteLine("The Apple WWDR intermediate certificate is not installed.");
    Debug.WriteLine("It is available at https://developer.apple.com/certificationauthority/AppleWWDRCA.cer");
    Debug.WriteLine("You may alternatively load the .cer like this...");
    success = appleWwdrCert.LoadFromFile("qa_data/certs/AppleWWDRCA.cer");
    if (success != true) {
        Debug.WriteLine(appleWwdrCert.LastErrorText);
        return;
    }

}

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

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

Chilkat.Cert cert = new Chilkat.Cert();
success = cert.LoadPfxBd(bdPfx,pfxPassword);
if (success != true) {
    Debug.WriteLine(cert.LastErrorText);
    return;
}

// Provide the signing cert (with associated private key).
success = crypt.SetSigningCert(cert);
if (success != true) {
    Debug.WriteLine(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.)
Chilkat.JsonObject jsonSignedAttrs = new Chilkat.JsonObject();
jsonSignedAttrs.UpdateInt("contentType",1);
jsonSignedAttrs.UpdateInt("signingTime",1);
crypt.SigningAttributes = jsonSignedAttrs.Emit();

// Sign the manifest JSON to produce a signature
crypt.EncodingMode = "base64";
string sig = await crypt.SignStringENCAsync(manifest.Emit());
Chilkat.BinData bdSig = new Chilkat.BinData();
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
Chilkat.BinData bdZip = new Chilkat.BinData();
success = await zip.WriteBdAsync(bdZip);
if (success != true) {
    Debug.WriteLine(zip.LastErrorText);
    return;
}

Debug.WriteLine("Success.");