(VB.NET 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
Dim success As Boolean
Dim manifest As New Chilkat.JsonObject
Dim crypt As New Chilkat.Crypt2

Dim zip As New Chilkat.Zip
zip.NewZip("notUsedAndNeverCreated.zip")

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

Dim digestStr As String

Dim pngData As New Chilkat.BinData
' Assume we load the pngData with bytes for "icon.png" from somewhere, such as a byte array in memory.
Dim entry As Chilkat.ZipEntry = 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)

Dim passJson As String = "{ .... }"'  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.
Dim certVault As New Chilkat.XmlCertVault
Dim appleWwdrCert As New Chilkat.Cert
success = appleWwdrCert.LoadByCommonName("Apple Worldwide Developer Relations Certification Authority")
If (success <> True) Then
    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) Then
        Debug.WriteLine(appleWwdrCert.LastErrorText)
        Exit Sub
    End If

End If

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

' Use a digital certificate and private key from a PFX
Dim bdPfx As New Chilkat.BinData
' Assume we loaded a PFX into bdPfx....
Dim pfxPassword As String = "test123"

Dim cert As New Chilkat.Cert
success = cert.LoadPfxBd(bdPfx,pfxPassword)
If (success <> True) Then
    Debug.WriteLine(cert.LastErrorText)
    Exit Sub
End If


' Provide the signing cert (with associated private key).
success = crypt.SetSigningCert(cert)
If (success <> True) Then
    Debug.WriteLine(crypt.LastErrorText)
    Exit Sub
End If


' 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.)
Dim jsonSignedAttrs As 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"
Dim sig As String = Await crypt.SignStringENCAsync(manifest.Emit())
Dim bdSig As 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
Dim bdZip As New Chilkat.BinData
success = Await zip.WriteBdAsync(bdZip)
If (success <> True) Then
    Debug.WriteLine(zip.LastErrorText)
    Exit Sub
End If


Debug.WriteLine("Success.")