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Validate a .pkpass Archive

See more Digital Signatures Examples

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. AutoIt

Local $bSuccess = False

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

$oCrypt = ObjCreate("Chilkat.Crypt2")
$oZip = ObjCreate("Chilkat.Zip")

$bSuccess = $oZip.OpenZip("qa_data/pkpass/invalid.pkpass")
If ($bSuccess = False) Then
    ConsoleWrite($oZip.LastErrorText & @CRLF)
    Exit
EndIf

; 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"
; }

$oEnt = ObjCreate("Chilkat.ZipEntry")
$bSuccess = $oZip.EntryOf("manifest.json",$oEnt)
If ($bSuccess = False) Then
    ConsoleWrite($oZip.LastErrorText & @CRLF)
    Exit
EndIf

; Get the exact content of the manifest.json for later signature verification.
$oBdManifest = ObjCreate("Chilkat.BinData")
$bSuccess = $oEnt.UnzipToBd($oBdManifest)

$oJson = ObjCreate("Chilkat.JsonObject")
$oJson.EmitCompact = False
$oJson.Load($oEnt.UnzipToString(0,"utf-8"))
ConsoleWrite($oJson.Emit() & @CRLF)

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

Local $bSomeHashesFailed = False
Local $sFilename
$oSbHashHex = ObjCreate("Chilkat.StringBuilder")
$oBdFileData = ObjCreate("Chilkat.BinData")
Local $iNumMembers = $oJson.Size
Local $i = 0
While $i < $iNumMembers
    $sFilename = $oJson.NameAt($i)
    $oSbHashHex.Clear 
    $oSbHashHex.Append($oJson.StringAt($i))

    $bSuccess = $oZip.EntryOf($sFilename,$oEnt)
    If ($bSuccess = False) Then
        ConsoleWrite($oZip.LastErrorText & @CRLF)
        Exit
    EndIf

    ; Get the data for this file.
    $oBdFileData.Clear()
    $bSuccess = $oEnt.UnzipToBd($oBdFileData)

Local $sComputedHashHex = $oCrypt.HashBdENC($oBdFileData)
    If ($oSbHashHex.ContentsEqual($sComputedHashHex,False) = False) Then
        ConsoleWrite("Computed hash does not match stored hash for " & $sFilename & @CRLF)
        ConsoleWrite("  computed: " & $sComputedHashHex & @CRLF)
        ConsoleWrite("  stored:   " & $oSbHashHex.GetAsString() & @CRLF)
        $bSomeHashesFailed = True
    Else
        ConsoleWrite("hash verified for " & $sFilename & "(" & $sComputedHashHex & ")" & @CRLF)
    EndIf

    $i = $i + 1
Wend

If ($bSomeHashesFailed = True) Then
    ConsoleWrite("Some hashes failed." & @CRLF)
    Exit
EndIf

; Let's verify the signature..
; First get the signature.
$bSuccess = $oZip.EntryOf("signature",$oEnt)
If ($bSuccess = False) Then
    ConsoleWrite($oZip.LastErrorText & @CRLF)
    Exit
EndIf

$oBdSignature = ObjCreate("Chilkat.BinData")
$bSuccess = $oEnt.UnzipToBd($oBdSignature)

; Show the contents of the signature in base64 encoding.
ConsoleWrite("Signature:" & @CRLF)
ConsoleWrite($oBdSignature.GetEncoded("base64_mime") & @CRLF)
ConsoleWrite("----" & @CRLF)

; Verify the signature against the manifest.json
$oCrypt.EncodingMode = "base64"
Local $bVerified = $oCrypt.VerifyBdENC($oBdManifest,$oBdSignature.GetEncoded("base64"))
If ($bVerified = False) Then
    ConsoleWrite($oCrypt.LastErrorText & @CRLF)
EndIf

ConsoleWrite("signature verified = " & $bVerified & @CRLF)