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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at */
* This target fuzzes NSS mpi against openssl bignum.
* It therefore requires openssl to be installed.
#include "mpi_helper.h"
extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
// We require at least size 3 to get two integers from Data.
if (size < 3) {
return 0;
auto modulus = get_modulus(data, size, ctx);
// Compare with OpenSSL exp mod
m1 = &std::get<1>(modulus);
// The exponent b (B) can get really big. Make it smaller if necessary.
if (MP_USED(&b) > 100) {
size_t shift = (MP_USED(&b) - 100) * MP_DIGIT_BIT;
mp_div_2d(&b, shift, &b, nullptr);
BN_rshift(B, B, shift);
check_equal(A, &a, max_size);
check_equal(B, &b, max_size);
check_equal(std::get<0>(modulus), m1, 3 * max_size);
assert(mp_exptmod(&a, &b, m1, &c) == MP_OKAY);
(void)BN_mod_exp(C, A, B, std::get<0>(modulus), ctx);
check_equal(C, &c, 2 * max_size);