(VBScript) Validate a .pkpass Archive

Opens a .pkpass archive (which is just a .zip renamed to .pkpass) and validates the contents. The hashes in the manifest are compared with the computed hash values for each individual file. If all computed hash values match, then the signature is verified.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

Dim fso, outFile
Set fso = CreateObject("Scripting.FileSystemObject")
'Create a Unicode (utf-16) output text file.
Set outFile = fso.CreateTextFile("output.txt", True, True)

' This example assumes the Chilkat API to have been previously unlocked.
' See Global Unlock Sample for sample code.

' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.Crypt2")
set crypt = CreateObject("Chilkat.Crypt2")
' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.Zip")
set zip = CreateObject("Chilkat.Zip")

success = zip.OpenZip("qa_data/pkpass/invalid.pkpass")
If (success = 0) Then
    outFile.WriteLine(zip.LastErrorText)
    WScript.Quit
End If

' Get the contents of the manifest.json file, which contains something like this:

' {
'   "icon.png" : "0296b01347b3173e98438a003b0e88986340b2d8",
'   "logo.png" : "25de09e2d3b01ce1fe00c2ca9a90a2be1aaa05cf",
'   "icon@2x.png" : "5afd9585b08c65fdf105a90c8bd643407cba2787",
'   "pass.json" : "145ea5a5db784fff485126c77ecf7a1fc2a88ee7",
'   "strip@2x.png" : "468fa7bc93e6b55342b56fda09bdce7c829d7d46",
'   "strip.png" : "736d01f84cb73d06e8a9932e43076d68f19461ff"
' }

' ent is a Chilkat.ZipEntry
Set ent = zip.GetEntryByName("manifest.json")
If (zip.LastMethodSuccess = 0) Then
    outFile.WriteLine("manifest.json entry not found.")
    WScript.Quit
End If

' Get the exact content of the manifest.json for later signature verification.
' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.BinData")
set bdManifest = CreateObject("Chilkat.BinData")
success = ent.UnzipToBd(bdManifest)

' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.JsonObject")
set json = CreateObject("Chilkat.JsonObject")
json.EmitCompact = 0
success = json.Load(ent.UnzipToString(0,"utf-8"))
outFile.WriteLine(json.Emit())

' For each file in the JSON, get the filename and hex hash value.
crypt.EncodingMode = "hexlower"
crypt.HashAlgorithm = "sha1"

someHashesFailed = 0

' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.StringBuilder")
set sbHashHex = CreateObject("Chilkat.StringBuilder")
' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.BinData")
set bdFileData = CreateObject("Chilkat.BinData")
numMembers = json.Size
i = 0
Do While i < numMembers
    filename = json.NameAt(i)
    sbHashHex.Clear 
    success = sbHashHex.Append(json.StringAt(i))

    ' ent is a Chilkat.ZipEntry
    Set ent = zip.GetEntryByName(filename)
    If (zip.LastMethodSuccess = 0) Then
        outFile.WriteLine(filename & " not found in the pkpass file.")
        WScript.Quit
    End If

    ' Get the data for this file.
    success = bdFileData.Clear()
    success = ent.UnzipToBd(bdFileData)

    computedHashHex = crypt.HashBdENC(bdFileData)
    If (sbHashHex.ContentsEqual(computedHashHex,0) = 0) Then
        outFile.WriteLine("Computed hash does not match stored hash for " & filename)
        outFile.WriteLine("  computed: " & computedHashHex)
        outFile.WriteLine("  stored:   " & sbHashHex.GetAsString())
        someHashesFailed = 1
    Else
        outFile.WriteLine("hash verified for " & filename & "(" & computedHashHex & ")")
    End If

    i = i + 1
Loop

If (someHashesFailed = 1) Then
    outFile.WriteLine("Some hashes failed.")
    WScript.Quit
End If

' Let's verify the signature..
' First get the signature.
' ent is a Chilkat.ZipEntry
Set ent = zip.GetEntryByName("signature")
If (zip.LastMethodSuccess = 0) Then
    outFile.WriteLine("signature not found in the pkpass file.")
    WScript.Quit
End If

' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.BinData")
set bdSignature = CreateObject("Chilkat.BinData")
success = ent.UnzipToBd(bdSignature)

' Show the contents of the signature in base64 encoding.
outFile.WriteLine("Signature:")
outFile.WriteLine(bdSignature.GetEncoded("base64_mime"))
outFile.WriteLine("----")

' Verify the signature against the manifest.json
crypt.EncodingMode = "base64"
verified = crypt.VerifyBdENC(bdManifest,bdSignature.GetEncoded("base64"))
If (verified = 0) Then
    outFile.WriteLine(crypt.LastErrorText)
End If

outFile.WriteLine("signature verified = " & verified)

outFile.Close