security/nss/fuzz/mpi_addmod_target.cc

   1 /* This Source Code Form is subject to the terms of the Mozilla Public
   2  * License, v. 2.0. If a copy of the MPL was not distributed with this
   3  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   4
   5 /*
   6  * This target fuzzes NSS mpi against openssl bignum.
   7  * It therefore requires openssl to be installed.
   8  */
   9
  10 #include "mpi_helper.h"
  11
  12 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
  13   // We require at least size 3 to get two integers from Data.
  14   if (size < 3) {
  15     return 0;
  16   }
  17   INIT_FOUR_NUMBERS
  18
  19   auto modulus = get_modulus(data, size, ctx);
  20   // Compare with OpenSSL add mod
  21   m1 = &std::get<1>(modulus);
  22   assert(mp_addmod(&a, &b, m1, &c) == MP_OKAY);
  23   (void)BN_mod_add(C, A, B, std::get<0>(modulus), ctx);
  24   check_equal(C, &c, max_size);
  25
  26   CLEANUP_AND_RETURN
  27 }