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-rw-r--r--security/nss/fuzz/mpi_mod_target.cc36
1 files changed, 36 insertions, 0 deletions
diff --git a/security/nss/fuzz/mpi_mod_target.cc b/security/nss/fuzz/mpi_mod_target.cc
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+++ b/security/nss/fuzz/mpi_mod_target.cc
@@ -0,0 +1,36 @@
+/* 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 3 to get two integers from Data.
+ if (size < 3) {
+ return 0;
+ }
+ INIT_FOUR_NUMBERS
+
+ // We can't divide by 0.
+ if (mp_cmp_z(&b) == 0) {
+ CLEANUP_AND_RETURN
+ }
+
+ // Compare with OpenSSL mod
+ assert(mp_mod(&a, &b, &c) == MP_OKAY);
+ (void)BN_mod(C, A, B, ctx);
+ check_equal(C, &c, max_size);
+
+ // Check a mod b = a - floor(a / b) * b
+ assert(mp_div(&a, &b, &r, nullptr) == MP_OKAY);
+ assert(mp_mul(&r, &b, &r) == MP_OKAY);
+ assert(mp_sub(&a, &r, &r) == MP_OKAY);
+ assert(mp_cmp(&c, &r) == 0);
+
+ CLEANUP_AND_RETURN
+}