(Swift 2) Working with PEM Encrypted Private Keys

Demonstrates how to load and save PEM encrypted private keys.

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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
    }

    let pem = CkoPem()

    var pemPassword: String? = "secret"

    // To load a PEM file containing encrypted private keys, simply
    // provide the password.
    success = pem.LoadPemFile("/Users/chilkat/testData/pem/pemContainingEncryptedPrivateKeys.pem", password: pemPassword)
    if success != true {
        print("\(pem.LastErrorText)")
        return
    }

    let fac = CkoFileAccess()
    var pemText: String? = fac.ReadEntireTextFile("/Users/chilkat/testData/pem/pemContainingEncryptedPrivateKeys.pem", charset: pemPassword)

    // To load a PEM from a string, call LoadPem instead of LoadPemFile:
    success = pem.LoadPem(pemText)
    if success != true {
        print("\(pem.LastErrorText)")
        return
    }

    // A few notes:
    // The PEM may contain both private keys and certificates (or anything else).
    // The password is utilized for whatever content in the PEM is encrypted.  
    // It is OK to have both encrypted and non-encrypted content within a given PEM.

    // PEM private keys can be encrypted in different formats.  The LoadPem and LoadPemFile
    // methods automatically handle the different formats.
    // One format is PKCS8 and is indicated by this delimiter within the PEM:

    // -----BEGIN ENCRYPTED PRIVATE KEY-----
    // MIICoTAbBgkqhkiG9w0BBQMwDgQIfdD0zv24lgkCAggABIICgE0PdHJmRbNs6cBX
    // ...

    // Another format, we'll call "passphrase" looks like this in the PEM:
    // -----BEGIN RSA PRIVATE KEY-----
    // Proc-Type: 4,ENCRYPTED
    // DEK-Info: DES-EDE3-CBC,A4215544D11C5D0C
    // 
    // paqy9XRexcSjurHfG0xhCaUD0HrvIdhuC0CbRxxxeMlkLaV6+uT80rBxt2AaibWG
    // ...

    // Show the bit length of each private key:
    var i: Int
    var numPrivateKeys: Int = pem.NumPrivateKeys.intValue
    if numPrivateKeys == 0 {
        print("\(("Error: Expected the PEM to contain private keys."))")
        return
    }

    for i = 1; i <= numPrivateKeys; i++ {
        var privKey: CkoPrivateKey? = pem.GetPrivateKey(i - 1)
        print("\(i): \(privKey!.BitLength.intValue) bits")
        privKey = nil
    }


}