1 files changed, 40 insertions, 0 deletions
diff --git a/security/nss/fuzz/mpi_sqr_target.cc b/security/nss/fuzz/mpi_sqr_target.cc
new file mode 100644
index 0000000000..b404d624c9
--- /dev/null
+++ b/security/nss/fuzz/mpi_sqr_target.cc
@@ -0,0 +1,40 @@
+/* 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;
+  }
+
+  INIT_THREE_NUMBERS
+
+  // 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, &b) == MP_OKAY);
+  bool eq = mp_cmp(&b, &c) == 0;
+  if (!eq) {
+    char rC[max_size], cC[max_size], aC[max_size];
+    mp_tohex(&b, 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);
+
+  CLEANUP_AND_RETURN_THREE
+}