Swift

Export an Encrypted PKCS #8 Private Key as Encoded Text

Demonstrates the Chilkat PrivateKey.GetPkcs8EncryptedENC method, which exports the key as password-protected PKCS #8 DER and encodes the encrypted DER as text. The first argument names the binary encoding and the second is the password. The cipher is selected by Pkcs8EncryptAlg.

Note: The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background: This combines encryption with text encoding: the key is protected by a passphrase and returned as a string, ideal for storing an encrypted key in a text-only medium such as JSON or an environment variable. It is the encrypted counterpart to GetPkcs8ENC. Source the password securely.

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Swift


func chilkatTest() {
    var success: Bool = false

    //  Load a private key to export.
    let privKey = CkoPrivateKey()!
    success = privKey.loadPemFile(path: "qa_data/private.pem")
    if success == false {
        print("\(privKey.lastErrorText!)")
        return
    }

    //  The key password is not hard-coded in a real application; obtain it from an interactive
    //  prompt, environment variable, or a secrets vault.
    var password: String? = "myKeyPassword"

    //  Export as password-protected PKCS #8 DER, then encode the encrypted DER as text.  The 1st
    //  argument names the binary encoding and the 2nd is the password.  The cipher is selected by the
    //  Pkcs8EncryptAlg property.
    var encoded: String? = privKey.getPkcs8EncryptedENC(encoding: "base64", password: password)
    if privKey.lastMethodSuccess == false {
        print("\(privKey.lastErrorText!)")
        return
    }

    print("\(encoded!)")

}