ReceiptValidation1.swift

ReceiptValidation1.swift

private func computeHash() {
  let identifierData = getDeviceIdentifier()
  
  var ctx = Insecure.SHA1.init()
  
  let identifierBytes: [UInt8] = .init(identifierData)
  ctx.update(data: identifierBytes)
  
  let opaqueHex = hexStringToData(string: "53547E14B435DDCBE06ED2BF986F4F5B")
  ctx.update(data: opaqueHex)
  
  let bundleIdHex = hexStringToData(string: "0C0F63682E6371642E5469636BC57473")
  ctx.update(data: bundleIdHex)
  
  let hash = ctx.finalize()
  print("hash ",hash)
}

func hexStringToData(string: String) -> Data {
    let stringArray = Array(string)
    var data: Data = Data()
    for i in stride(from: 0, to: string.count, by: 2) {
        let pair: String = String(stringArray[i]) + String(stringArray[i+1])
        if let byteNum = UInt8(pair, radix: 16) {
            let byte = Data([byteNum])
            data.append(byte)
        }
        else{
            fatalError()
        }
    }
    return data
}

func getDeviceIdentifier() -> Data {
      let device = UIDevice.current
      var uuid = device.identifierForVendor!.uuid
      let addr = withUnsafePointer(to: &uuid) { (p) -> UnsafeRawPointer in
        UnsafeRawPointer(p)
      }
      let data = Data(bytes: addr, count: 16)
      return data
    }