Unlock a PDF document

unlock.swift

if let pdf = unlock(data: pdfData, password: "Hello World") {
	print("You now have an unlocked CGPDFDocument")
}

func unlock(data: Data, password: String) -> CGPDFDocument? {
    if let pdf = CGPDFDocument(CGDataProvider(data: data as CFData)!) {
        guard pdf.isEncrypted == true else { return pdf }
        guard pdf.unlockWithPassword("") == false else { return pdf }
        
        if let cPasswordString = password.cString(using: String.Encoding.utf8) {
            if pdf.unlockWithPassword(cPasswordString) {
                return pdf
            }
        }
    }
    return nil
}