Swift Requires Chilkat v11.0.0+

Working with PEM Encrypted Private Keys

See more PEM Examples

Demonstrates how to load and save PEM encrypted private keys. Swift

func chilkatTest() {
    var success: Bool = false

    //  This example assumes the Chilkat API to have been previously unlocked.
    //  See Global Unlock Sample for sample code.

    success = false

    let pem = CkoPem()!

    var pemPassword: String? = "secret"

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

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

    //  To load a PEM from a string, call LoadPem instead of LoadPemFile:
    success = pem.load(pemContent: pemText)
    if success == false {
        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
    }

    let privKey = CkoPrivateKey()!
    for i = 1; i <= numPrivateKeys; i++ {
        pem.privateKey(at: i - 1, privKey: privKey)
        print("\(i): \(privKey.bitLength.intValue) bits")
    }


}