SharpTox.Encryption.ToxEncryptionFunctions.DeriveKeyFromPass C# (CSharp) Method

        internal static extern bool DeriveKeyFromPass(byte[] passphrase, uint passphraseLength, ref ToxPassKey outputKey, ref ToxErrorKeyDerivation error);

        internal static ToxPassKey? DeriveKey(string passphrase)
        {
            byte[] pp = Encoding.UTF8.GetBytes(passphrase);
            var error = ToxErrorKeyDerivation.Ok;
            var key = new ToxPassKey();

            if (!ToxEncryptionFunctions.DeriveKeyFromPass(pp, (uint)pp.Length, ref key, ref error) || error != ToxErrorKeyDerivation.Ok)
                return null;

            return key;
        }