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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 http://mozilla.org/MPL/2.0/. */
/*
* 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 2 to get an integers from Data.
if (size < 2) {
return 0;
}
mp_int a, c, r;
BN_CTX *ctx = BN_CTX_new();
BN_CTX_start(ctx);
BIGNUM *A = BN_CTX_get(ctx);
BIGNUM *C = BN_CTX_get(ctx);
assert(mp_init(&a) == MP_OKAY);
assert(mp_init(&c) == MP_OKAY);
assert(mp_init(&r) == MP_OKAY);
size_t max_size = 4 * size + 1;
parse_input(data, size, A, &a);
// Compare with OpenSSL sqr
assert(mp_sqr(&a, &c) == MP_OKAY);
(void)BN_sqr(C, A, ctx);
check_equal(C, &c, max_size);
// Check a * a == a**2
assert(mp_mul(&a, &a, &r) == MP_OKAY);
bool eq = mp_cmp(&r, &c) == 0;
if (!eq) {
char rC[max_size], cC[max_size], aC[max_size];
mp_tohex(&r, rC);
mp_tohex(&c, cC);
mp_tohex(&a, aC);
std::cout << "a = " << std::hex << aC << std::endl;
std::cout << "a * a = " << std::hex << cC << std::endl;
std::cout << "a ** 2 = " << std::hex << rC << std::endl;
}
assert(eq);
mp_clear(&a);
mp_clear(&c);
mp_clear(&r);
BN_CTX_end(ctx);
BN_CTX_free(ctx);
return 0;
}
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