B4X Requires Chilkat v11.0.0+

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 B4X

Dim success As Boolean = 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 ChilkatJsonObject
manifest.Initialize
Dim crypt As ChilkatCrypt2
crypt.Initialize("crypt")

Dim zip As ChilkatZip
zip.Initialize("zip")
zip.NewZip("notUsedAndNeverCreated.zip")

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

Dim digestStr As String

Dim pngData As ChilkatBinData
pngData.Initialize
'  Assume we load the pngData with bytes for "icon.png" from somewhere, such as a byte array in memory.
zip.AddBd("icon.png", pngData)
digestStr = crypt.HashBdENC(pngData)
manifest.UpdateString(Chr(34) & "icon.png" & Chr(34), digestStr)

pngData.Clear
'  Assume we load the pngData with bytes for "icon@2x.png" from somewhere...
zip.AddBd("icon@2x.png", pngData)
digestStr = crypt.HashBdENC(pngData)
manifest.UpdateString(Chr(34) & "icon@2x.png" & Chr(34), digestStr)

pngData.Clear
'  Assume we load the pngData with bytes for "logo.png" from somewhere...
zip.AddBd("logo.png", pngData)
digestStr = crypt.HashBdENC(pngData)
manifest.UpdateString(Chr(34) & "logo.png" & Chr(34), digestStr)

pngData.Clear
'  Assume we load the pngData with bytes for "logo@2x.png" from somewhere...
zip.AddBd("logo@2x.png", pngData)
digestStr = crypt.HashBdENC(pngData)
manifest.UpdateString(Chr(34) & "logo@2x.png" & Chr(34), digestStr)

Dim passJson As String = "{ .... }"'  Contains the contents of pass.json
zip.AddString("pass.json", passJson, "utf-8")
digestStr = crypt.HashStringENC(passJson)
manifest.UpdateString(Chr(34) & "pass.json" & Chr(34), digestStr)

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 ChilkatXmlCertVault
certVault.Initialize
Dim appleWwdrCert As ChilkatCert
appleWwdrCert.Initialize("appleWwdrCert")
success = appleWwdrCert.LoadByCommonName("Apple Worldwide Developer Relations Certification Authority")
If success <> True Then
    Log("The Apple WWDR intermediate certificate is not installed.")
    Log("It is available at https://developer.apple.com/certificationauthority/AppleWWDRCA.cer")
    Log("You may alternatively load the .cer like this...")
    success = appleWwdrCert.LoadFromFile("qa_data/certs/AppleWWDRCA.cer")
    If success = False Then
        Log(appleWwdrCert.LastErrorText)
        Return
    End If


End If

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

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

Dim cert As ChilkatCert
cert.Initialize("cert")
success = cert.LoadPfxBd(bdPfx, pfxPassword)
If success = False Then
    Log(cert.LastErrorText)
    Return
End If


'  Provide the signing cert (with associated private key).
success = crypt.SetSigningCert(cert)
If success = False Then
    Log(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 ChilkatJsonObject
jsonSignedAttrs.Initialize
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 = crypt.SignStringENC(manifest.Emit)
Dim bdSig As ChilkatBinData
bdSig.Initialize
bdSig.AppendEncoded(sig, "base64")
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 ChilkatBinData
bdZip.Initialize
success = zip.WriteBd(bdZip)
If success = False Then
    Log(zip.LastErrorText)
    Return
End If


Log("Success.")