gtests/pk11_gtest/pk11_prng_unittest.cc
author Martin Thomson <martin.thomson@gmail.com>
Sat, 12 Nov 2016 13:52:44 +0900
changeset 12842 5fbf1bf10b65e4717347dc8f003e509ad22d0a4f
parent 12785 c70fffcd487e4a91f1d3775e8ffb1505f54a9fe6
child 13245 b4c3f3a08273d2031850c955b579c28988d09e72
permissions -rw-r--r--
Bug 1310610 - Exporters for TLS 1.3, r=ekr

/* -*- 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