Xojo Plugin

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 Xojo Plugin

Dim success As Boolean
success = False

// 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 manifest As New Chilkat.JsonObject
Dim crypt As New Chilkat.Crypt2

Dim zip As New Chilkat.Zip
success = 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.
success = zip.AddBd("icon.png",pngData)
digestStr = crypt.HashBdENC(pngData)
success = manifest.UpdateString("""icon.png""",digestStr)

success = pngData.Clear()
// Assume we load the pngData with bytes for "icon@2x.png" from somewhere...
success = zip.AddBd("icon@2x.png",pngData)
digestStr = crypt.HashBdENC(pngData)
success = manifest.UpdateString("""icon@2x.png""",digestStr)

success = pngData.Clear()
// Assume we load the pngData with bytes for "logo.png" from somewhere...
success = zip.AddBd("logo.png",pngData)
digestStr = crypt.HashBdENC(pngData)
success = manifest.UpdateString("""logo.png""",digestStr)

success = pngData.Clear()
// Assume we load the pngData with bytes for "logo@2x.png" from somewhere...
success = zip.AddBd("logo@2x.png",pngData)
digestStr = crypt.HashBdENC(pngData)
success = manifest.UpdateString("""logo@2x.png""",digestStr)

Dim passJson As String
passJson = "{ .... }"//  Contains the contents of pass.json
success = zip.AddString("pass.json",passJson,"utf-8")
digestStr = crypt.HashStringENC(passJson)
success = manifest.UpdateString("""pass.json""",digestStr)

success = zip.AddString("manifest.json",manifest.Emit(),"utf-8")

// 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
    System.DebugLog("The Apple WWDR intermediate certificate is not installed.")
    System.DebugLog("It is available at https://developer.apple.com/certificationauthority/AppleWWDRCA.cer")
    System.DebugLog("You may alternatively load the .cer like this...")
    success = appleWwdrCert.LoadFromFile("qa_data/certs/AppleWWDRCA.cer")
    If (success = False) Then
        System.DebugLog(appleWwdrCert.LastErrorText)
        Return
    End If

End If

success = certVault.AddCert(appleWwdrCert)
success = 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
pfxPassword = "test123"

Dim cert As New Chilkat.Cert
success = cert.LoadPfxBd(bdPfx,pfxPassword)
If (success = False) Then
    System.DebugLog(cert.LastErrorText)
    Return
End If

// Provide the signing cert (with associated private key).
success = crypt.SetSigningCert(cert)
If (success = False) Then
    System.DebugLog(crypt.LastErrorText)
    Return
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
success = jsonSignedAttrs.UpdateInt("contentType",1)
success = jsonSignedAttrs.UpdateInt("signingTime",1)
crypt.SigningAttributes = jsonSignedAttrs.Emit()

// Sign the manifest JSON to produce a signature
crypt.EncodingMode = "base64"
Dim sig As String
sig = crypt.SignStringENC(manifest.Emit())
Dim bdSig As New Chilkat.BinData
success = bdSig.AppendEncoded(sig,"base64")
success = zip.AddBd("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 = zip.WriteBd(bdZip)
If (success = False) Then
    System.DebugLog(zip.LastErrorText)
    Return
End If

System.DebugLog("Success.")