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