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// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/cert/merkle_audit_proof.h"
#include "base/check.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace net::ct {
namespace {
TEST(MerkleAuditProofTest, CalculatesAuditPathLengthCorrectly) {
// Test all leaves up to a tree size of 4:
EXPECT_EQ(0u, CalculateAuditPathLength(0, 1));
EXPECT_EQ(1u, CalculateAuditPathLength(0, 2));
EXPECT_EQ(1u, CalculateAuditPathLength(1, 2));
EXPECT_EQ(2u, CalculateAuditPathLength(0, 3));
EXPECT_EQ(2u, CalculateAuditPathLength(1, 3));
EXPECT_EQ(1u, CalculateAuditPathLength(2, 3));
EXPECT_EQ(2u, CalculateAuditPathLength(0, 4));
EXPECT_EQ(2u, CalculateAuditPathLength(1, 4));
EXPECT_EQ(2u, CalculateAuditPathLength(2, 4));
EXPECT_EQ(2u, CalculateAuditPathLength(3, 4));
// Boundary cases for a larger tree size:
EXPECT_EQ(9u, CalculateAuditPathLength(0, 257));
EXPECT_EQ(9u, CalculateAuditPathLength(255, 257));
EXPECT_EQ(1u, CalculateAuditPathLength(256, 257));
// Example from CT over DNS draft RFC:
EXPECT_EQ(20u, CalculateAuditPathLength(123456, 999999));
// Test data from
// https://github.com/google/certificate-transparency/blob/af98904302724c29aa6659ca372d41c9687de2b7/python/ct/crypto/merkle_test.py:
EXPECT_EQ(22u, CalculateAuditPathLength(848049, 3630887));
}
TEST(MerkleAuditProofDeathTest, DiesIfLeafIndexIsGreaterThanOrEqualToTreeSize) {
#ifdef OFFICIAL_BUILD
// The official build does not print the reason a CHECK failed.
const char kErrorRegex[] = "";
#else
const char kErrorRegex[] = "leaf_index < tree_size";
#endif
EXPECT_DEATH_IF_SUPPORTED(CalculateAuditPathLength(0, 0), kErrorRegex);
EXPECT_DEATH_IF_SUPPORTED(CalculateAuditPathLength(10, 10), kErrorRegex);
EXPECT_DEATH_IF_SUPPORTED(CalculateAuditPathLength(11, 10), kErrorRegex);
}
} // namespace
} // namespace net::ct
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