public string crypt(string str, PasswordSecure pwd = null)
{
if (pwd == null)
{
pwd = key;
}
var sha = new SHA3(str.Length);
if (random == null)
{
var inits = str + DateTime.Now.ToString("r");
var t = new UTF32Encoding().GetBytes(inits);
var bbi = new BytesBuilder();
bbi.add(t);
bbi.add(sha.CreateInitVector(0, 64, 40));
var init = bbi.getBytes();
random = new SHA3.SHA3Random(init);
bbi.clear();
BytesBuilder.ClearString(inits);
BytesBuilder.ToNull(init);
}
var bytes = new UTF32Encoding().GetBytes(str);
var openKey = pwd.getObjectValue();
var crypted = sha.multiCryptLZMA(bytes, openKey, null, 22, false);
BytesBuilder.BytesToNull(openKey);
BytesBuilder.BytesToNull(bytes);
BytesBuilder.ClearString(str);
return(Convert.ToBase64String(crypted));
}