Visual FoxPro

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 Visual FoxPro

LOCAL lnSuccess
LOCAL loManifest
LOCAL loCrypt
LOCAL loZip
LOCAL lcDigestStr
LOCAL loPngData
LOCAL lcPassJson
LOCAL loCertVault
LOCAL loAppleWwdrCert
LOCAL loBdPfx
LOCAL lcPfxPassword
LOCAL loCert
LOCAL loJsonSignedAttrs
LOCAL lcSig
LOCAL loBdSig
LOCAL loBdZip

lnSuccess = 0

* 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

loManifest = CreateObject('Chilkat.JsonObject')
loCrypt = CreateObject('Chilkat.Crypt2')

loZip = CreateObject('Chilkat.Zip')
loZip.NewZip("notUsedAndNeverCreated.zip")

loCrypt.HashAlgorithm = "sha1"
* Return hashes as lowercase hex.
loCrypt.EncodingMode = "hexlower"

loPngData = CreateObject('Chilkat.BinData')
* Assume we load the pngData with bytes for "icon.png" from somewhere, such as a byte array in memory.
loZip.AddBd("icon.png",loPngData)
lcDigestStr = loCrypt.HashBdENC(loPngData)
loManifest.UpdateString('"icon.png"',lcDigestStr)

loPngData.Clear()
* Assume we load the pngData with bytes for "icon@2x.png" from somewhere...
loZip.AddBd("icon@2x.png",loPngData)
lcDigestStr = loCrypt.HashBdENC(loPngData)
loManifest.UpdateString('"icon@2x.png"',lcDigestStr)

loPngData.Clear()
* Assume we load the pngData with bytes for "logo.png" from somewhere...
loZip.AddBd("logo.png",loPngData)
lcDigestStr = loCrypt.HashBdENC(loPngData)
loManifest.UpdateString('"logo.png"',lcDigestStr)

loPngData.Clear()
* Assume we load the pngData with bytes for "logo@2x.png" from somewhere...
loZip.AddBd("logo@2x.png",loPngData)
lcDigestStr = loCrypt.HashBdENC(loPngData)
loManifest.UpdateString('"logo@2x.png"',lcDigestStr)

lcPassJson = "{ .... }"*  Contains the contents of pass.json
loZip.AddString("pass.json",lcPassJson,"utf-8")
lcDigestStr = loCrypt.HashStringENC(lcPassJson)
loManifest.UpdateString('"pass.json"',lcDigestStr)

loZip.AddString("manifest.json",loManifest.Emit(),"utf-8")

* Make sure we have the Apple WWDR intermediate certificate available for 
* the cert chain in the signature.
loCertVault = CreateObject('Chilkat.XmlCertVault')
loAppleWwdrCert = CreateObject('Chilkat.Cert')
lnSuccess = loAppleWwdrCert.LoadByCommonName("Apple Worldwide Developer Relations Certification Authority")
IF (lnSuccess <> 1) THEN
    ? "The Apple WWDR intermediate certificate is not installed."
    ? "It is available at https://developer.apple.com/certificationauthority/AppleWWDRCA.cer"
    ? "You may alternatively load the .cer like this..."
    lnSuccess = loAppleWwdrCert.LoadFromFile("qa_data/certs/AppleWWDRCA.cer")
    IF (lnSuccess = 0) THEN
        ? loAppleWwdrCert.LastErrorText
        RELEASE loManifest
        RELEASE loCrypt
        RELEASE loZip
        RELEASE loPngData
        RELEASE loCertVault
        RELEASE loAppleWwdrCert
        CANCEL
    ENDIF

ENDIF

loCertVault.AddCert(loAppleWwdrCert)
loCrypt.UseCertVault(loCertVault)

* Use a digital certificate and private key from a PFX
loBdPfx = CreateObject('Chilkat.BinData')
* Assume we loaded a PFX into bdPfx....
lcPfxPassword = "test123"

loCert = CreateObject('Chilkat.Cert')
lnSuccess = loCert.LoadPfxBd(loBdPfx,lcPfxPassword)
IF (lnSuccess = 0) THEN
    ? loCert.LastErrorText
    RELEASE loManifest
    RELEASE loCrypt
    RELEASE loZip
    RELEASE loPngData
    RELEASE loCertVault
    RELEASE loAppleWwdrCert
    RELEASE loBdPfx
    RELEASE loCert
    CANCEL
ENDIF

* Provide the signing cert (with associated private key).
lnSuccess = loCrypt.SetSigningCert(loCert)
IF (lnSuccess = 0) THEN
    ? loCrypt.LastErrorText
    RELEASE loManifest
    RELEASE loCrypt
    RELEASE loZip
    RELEASE loPngData
    RELEASE loCertVault
    RELEASE loAppleWwdrCert
    RELEASE loBdPfx
    RELEASE loCert
    CANCEL
ENDIF

* 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.)
loJsonSignedAttrs = CreateObject('Chilkat.JsonObject')
loJsonSignedAttrs.UpdateInt("contentType",1)
loJsonSignedAttrs.UpdateInt("signingTime",1)
loCrypt.SigningAttributes = loJsonSignedAttrs.Emit()

* Sign the manifest JSON to produce a signature
loCrypt.EncodingMode = "base64"
lcSig = loCrypt.SignStringENC(loManifest.Emit())
loBdSig = CreateObject('Chilkat.BinData')
loBdSig.AppendEncoded(lcSig,"base64")
loZip.AddBd("signature",loBdSig)

* ---------------------------------------------------------------------------------------------
* 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
loBdZip = CreateObject('Chilkat.BinData')
lnSuccess = loZip.WriteBd(loBdZip)
IF (lnSuccess = 0) THEN
    ? loZip.LastErrorText
    RELEASE loManifest
    RELEASE loCrypt
    RELEASE loZip
    RELEASE loPngData
    RELEASE loCertVault
    RELEASE loAppleWwdrCert
    RELEASE loBdPfx
    RELEASE loCert
    RELEASE loJsonSignedAttrs
    RELEASE loBdSig
    RELEASE loBdZip
    CANCEL
ENDIF

? "Success."

RELEASE loManifest
RELEASE loCrypt
RELEASE loZip
RELEASE loPngData
RELEASE loCertVault
RELEASE loAppleWwdrCert
RELEASE loBdPfx
RELEASE loCert
RELEASE loJsonSignedAttrs
RELEASE loBdSig
RELEASE loBdZip