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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
/*
* 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;
}
INIT_FOUR_NUMBERS
// Compare with OpenSSL subtraction
assert(mp_sub(&a, &b, &c) == MP_OKAY);
(void)BN_sub(C, A, B);
check_equal(C, &c, max_size);
// Check a - b == a + -b
mp_neg(&b, &b);
assert(mp_add(&a, &b, &r) == MP_OKAY);
bool eq = mp_cmp(&r, &c) == 0;
if (!eq) {
char rC[max_size], cC[max_size], aC[max_size], bC[max_size];
mp_tohex(&r, rC);
mp_tohex(&c, cC);
mp_tohex(&a, aC);
mp_tohex(&b, bC);
std::cout << "a = " << std::hex << aC << std::endl;
std::cout << "-b = " << std::hex << bC << std::endl;
std::cout << "a - b = " << std::hex << cC << std::endl;
std::cout << "a + -b = " << std::hex << rC << std::endl;
}
assert(eq);
CLEANUP_AND_RETURN
}