-rw-r--r-- 975 cryptattacktester-20230614/aes128_enum_prob.cpp raw
#include "queue_prob.h"
#include "aes128_enum_prob.h"

using namespace std;

bigfloat aes128_enum_prob(const vector<bigint> &params,const vector<bigint> &attackparams)
{
  bigint K = params.at(0);
  bigint C = params.at(1);
  bigint I = attackparams.at(0);
  bigint QX = attackparams.at(1);
  bigint QU = attackparams.at(2);
  bigint QF = attackparams.at(3);
  bigint PE = QU*QF;
  bigint searchspace = bigint(1)<<K;

  for (bigint prec = 32;;prec *= 2) {
    bigfloat::set_default_precision(prec);

    bigfloat result = bigfloat(I)/bigfloat(searchspace);
    if (QX && (I > 0)) {
      bigint full_clears = I/PE;
      bigint leftovers = I%PE;
      bigfloat pr0 = exp2(bigfloat(-bigint(C)));
      bigfloat survivors = full_clears*queue_average(PE,pr0,QU)+queue_average(leftovers,pr0,QU);
      result *= survivors/(pr0*bigfloat(I));
    }
    result += bigfloat(1)/bigfloat(searchspace);

    if (result.definitely_positive_and_reasonably_precise()) return result;
  }
}