(Swift 3,4,5...) Iterate Keys and Certs in PEM

Demonstrates how to access each of the private keys and certs contained within a PEM.

Chilkat Downloads for the Swift Programming Language MAC OS X (Cocoa) Objective-C/Swift Libs iOS Objective-C/Swift Libs

func chilkatTest() {
    // Starting in v9.5.0.49, all Chilkat classes can be unlocked at once at the beginning of a program
    // by calling UnlockBundle.  It requires a Bundle unlock code.
    let chilkatGlob = CkoGlobal()!
    var success: Bool = chilkatGlob.unlockBundle("Anything for 30-day trial.")
    if success != true {
        print("\(chilkatGlob.lastErrorText!)")
        return
    }

    // The Chilkat PEM class was introduced in v9.5.0.49.  
    // It requires the bundle to be unlocked, as shown above.
    let pem = CkoPem()!

    // Load the PEM from a file.
    // If the PEM is encrypted, provide a password.  Otherwise pass an empty string for the password.
    var password: String? = "myPassword"
    success = pem.loadFile("../myPemFiles/myPem.pem", password: password)
    if success != true {
        print("\(pem.lastErrorText!)")
        return
    }

    // Note: If the app already has the PEM pre-loaded in a string variable, then load it 
    // by calling LoadPem instead.  
    var pemContent: String? = "... the PEM contents ..."
    success = pem.load(pemContent, password: password)
    // Check for success as before..

    // Iterate over the private keys.
    var numPrivateKeys: Int = pem.numPrivateKeys.intValue
    var i: Int = 0

    while i < numPrivateKeys {

        var privKey: CkoPrivateKey? = pem.getPrivateKey(i)
        print("Private Key \(i) is \(privKey!.bitLength.intValue) in length")
        privKey = nil

        i = i + 1
    }

    // Iterate over the certificates.
    var numCerts: Int = pem.numCerts.intValue
    i = 0

    while i < numCerts {

        var cert: CkoCert? = pem.getCert(i)
        print("Certificate \(i) : \(cert!.subjectDN!)")
        cert = nil

        i = i + 1
    }


}