1 files changed, 78 insertions, 0 deletions
diff --git a/security/nss/gtests/pk11_gtest/pk11_prng_unittest.cc b/security/nss/gtests/pk11_gtest/pk11_prng_unittest.cc
new file mode 100644
index 000000000..fd2865169
--- /dev/null
+++ b/security/nss/gtests/pk11_gtest/pk11_prng_unittest.cc
@@ -0,0 +1,78 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* 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/. */
+
+#include <memory>
+#include "blapi.h"
+#include "pk11pub.h"
+
+#include "gtest/gtest.h"
+
+namespace nss_test {
+
+class PK11PrngTest : public ::testing::Test {};
+
+#ifdef UNSAFE_FUZZER_MODE
+
+// Test that two consecutive calls to the RNG return two distinct values.
+TEST_F(PK11PrngTest, Fuzz_DetPRNG) {
+  std::vector<uint8_t> rnd1(2048, 0);
+  std::vector<uint8_t> rnd2(2048, 0);
+
+  SECStatus rv = PK11_GenerateRandom(rnd1.data(), rnd1.size());
+  EXPECT_EQ(rv, SECSuccess);
+
+  rv = PK11_GenerateRandom(rnd2.data(), rnd2.size());
+  EXPECT_EQ(rv, SECSuccess);
+
+  EXPECT_NE(rnd1, rnd2);
+}
+
+// Test that two consecutive calls to the RNG return two equal values
+// when the RNG's internal state is reset before each call.
+TEST_F(PK11PrngTest, Fuzz_DetPRNG_Reset) {
+  std::vector<uint8_t> rnd1(2048, 0);
+  std::vector<uint8_t> rnd2(2048, 0);
+
+  RNG_ResetForFuzzing();
+
+  SECStatus rv = PK11_GenerateRandom(rnd1.data(), rnd1.size());
+  EXPECT_EQ(rv, SECSuccess);
+
+  RNG_ResetForFuzzing();
+
+  rv = PK11_GenerateRandom(rnd2.data(), rnd2.size());
+  EXPECT_EQ(rv, SECSuccess);
+
+  EXPECT_EQ(rnd1, rnd2);
+}
+
+// Test that the RNG's internal state progresses in a consistent manner.
+TEST_F(PK11PrngTest, Fuzz_DetPRNG_StatefulReset) {
+  std::vector<uint8_t> rnd1(2048, 0);
+  std::vector<uint8_t> rnd2(2048, 0);
+
+  RNG_ResetForFuzzing();
+
+  SECStatus rv = PK11_GenerateRandom(rnd1.data(), rnd1.size() - 1024);
+  EXPECT_EQ(rv, SECSuccess);
+
+  rv = PK11_GenerateRandom(rnd1.data() + 1024, rnd1.size() - 1024);
+  EXPECT_EQ(rv, SECSuccess);
+
+  RNG_ResetForFuzzing();
+
+  rv = PK11_GenerateRandom(rnd2.data(), rnd2.size() - 1024);
+  EXPECT_EQ(rv, SECSuccess);
+
+  rv = PK11_GenerateRandom(rnd2.data() + 1024, rnd2.size() - 1024);
+  EXPECT_EQ(rv, SECSuccess);
+
+  EXPECT_EQ(rnd1, rnd2);
+}
+
+#endif
+
+}  // namespace nss_test