Swift

Save a Private Key as an Encrypted PKCS #8 DER File

Demonstrates the Chilkat PrivateKey.SavePkcs8EncryptedFile method, which saves the key as password-protected PKCS #8 DER. The first argument is the password and the second is the destination path. 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 is the recommended way to persist a key to disk: the binary .der is encrypted under a passphrase, so a stolen file is useless without it. Reach for it whenever a key is stored or shipped. Choose the encryption cipher with Pkcs8EncryptAlg and source the password securely.

Chilkat Swift Downloads

Download Chilkat for Swift

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"

    //  Save as password-protected PKCS #8 DER.  The 1st argument is the password and the 2nd is the
    //  destination path.  The cipher is selected by the Pkcs8EncryptAlg property.
    success = privKey.savePkcs8EncryptedFile(password: password, path: "qa_output/private_pkcs8_enc.der")
    if success == false {
        print("\(privKey.lastErrorText!)")
        return
    }

    print("Saved (encrypted).")

}