Visual FoxPro

Sign Manifest File to Generate a Passbook .pkpass file

See more Digital Signatures Examples

Demonstrates how to create a Passbook .pkpass archive by creating a signature of a manifest file and then zipping to a .pkpass archive.

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

Visual FoxPro

LOCAL lnSuccess
LOCAL loManifest
LOCAL loCrypt
LOCAL loZip
LOCAL lcFileHash
LOCAL lcFilePath
LOCAL loSbJson
LOCAL lcManifestPath
LOCAL loCertVault
LOCAL loAppleWwdrCert
LOCAL lcPfxPath
LOCAL lcPfxPassword
LOCAL loCert
LOCAL loJsonSignedAttrs
LOCAL lcSigPath

lnSuccess = 0

* This requires the Chilkat API to have been previously unlocked.
* See Global Unlock Sample for sample code.

* ---------------------------------------------------------------------------------------------
* Note: Chilkat also has the capability to do everything in-memory (no files would be involved).  
* See this example:  Sign Manifest File to Generate a Passbook .pkpass in Memory
* ---------------------------------------------------------------------------------------------

* First create the manifest.json

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

loZip = CreateObject('Chilkat.Zip')
loZip.NewZip("qa_data/p7s/pass-wallet/example.pkpass")
* Set the AppendFromDir property to prevent that relative paths from being stored in the .pkpass archive.
loZip.AppendFromDir = "qa_data/p7s/pass-wallet/"

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

lcFilePath = "qa_data/p7s/pass-wallet/icon.png"
lcFileHash = loCrypt.HashFileENC(lcFilePath)
loZip.AddFile("icon.png",0)
loManifest.UpdateString('"icon.png"',lcFileHash)

lcFilePath = "qa_data/p7s/pass-wallet/icon@2x.png"
lcFileHash = loCrypt.HashFileENC(lcFilePath)
loZip.AddFile("icon@2x.png",0)
loManifest.UpdateString('"icon@2x.png"',lcFileHash)

lcFilePath = "qa_data/p7s/pass-wallet/logo.png"
lcFileHash = loCrypt.HashFileENC(lcFilePath)
loZip.AddFile("logo.png",0)
loManifest.UpdateString('"logo.png"',lcFileHash)

lcFilePath = "qa_data/p7s/pass-wallet/logo@2x.png"
lcFileHash = loCrypt.HashFileENC(lcFilePath)
loZip.AddFile("logo@2x.png",0)
loManifest.UpdateString('"logo@2x.png"',lcFileHash)

lcFilePath = "qa_data/p7s/pass-wallet/pass.json"
lcFileHash = loCrypt.HashFileENC(lcFilePath)
loZip.AddFile("pass.json",0)
loManifest.UpdateString('"pass.json"',lcFileHash)

loSbJson = CreateObject('Chilkat.StringBuilder')
loManifest.EmitSb(loSbJson)
lcManifestPath = "qa_data/p7s/pass-wallet/manifest.json"
loSbJson.WriteFile(lcManifestPath,"utf-8",0)
loZip.AddFile("manifest.json",0)

* 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 loSbJson
        RELEASE loCertVault
        RELEASE loAppleWwdrCert
        CANCEL
    ENDIF

ENDIF

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

* Use a digital certificate and private key from a PFX file (.pfx or .p12).
lcPfxPath = "qa_data/pfx/cert_test123.pfx"
lcPfxPassword = "test123"

loCert = CreateObject('Chilkat.Cert')
lnSuccess = loCert.LoadPfxFile(lcPfxPath,lcPfxPassword)
IF (lnSuccess = 0) THEN
    ? loCert.LastErrorText
    RELEASE loManifest
    RELEASE loCrypt
    RELEASE loZip
    RELEASE loSbJson
    RELEASE loCertVault
    RELEASE loAppleWwdrCert
    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 loSbJson
    RELEASE loCertVault
    RELEASE loAppleWwdrCert
    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 file to produce a file named "signature".
lcSigPath = "qa_data/p7s/pass-wallet/signature"

* Create the "signature" file.
lnSuccess = loCrypt.CreateP7S(lcManifestPath,lcSigPath)
IF (lnSuccess = 0) THEN
    ? loCrypt.LastErrorText
    RELEASE loManifest
    RELEASE loCrypt
    RELEASE loZip
    RELEASE loSbJson
    RELEASE loCertVault
    RELEASE loAppleWwdrCert
    RELEASE loCert
    RELEASE loJsonSignedAttrs
    CANCEL
ENDIF

loZip.AddFile("signature",0)

* ---------------------------------------------------------------------------------------------
* 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).
lnSuccess = loZip.WriteZipAndClose()
IF (lnSuccess = 0) THEN
    ? loZip.LastErrorText
    RELEASE loManifest
    RELEASE loCrypt
    RELEASE loZip
    RELEASE loSbJson
    RELEASE loCertVault
    RELEASE loAppleWwdrCert
    RELEASE loCert
    RELEASE loJsonSignedAttrs
    CANCEL
ENDIF

? "Success."

RELEASE loManifest
RELEASE loCrypt
RELEASE loZip
RELEASE loSbJson
RELEASE loCertVault
RELEASE loAppleWwdrCert
RELEASE loCert
RELEASE loJsonSignedAttrs