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- // Copyright (c) 2011 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 "crypto/p224_spake.h"
- #include <stddef.h>
- #include <stdint.h>
- #include <string>
- #include "base/strings/string_number_conversions.h"
- #include "testing/gtest/include/gtest/gtest.h"
- namespace crypto {
- namespace {
- std::string HexEncodeString(const std::string& binary_data) {
- return base::HexEncode(binary_data.c_str(), binary_data.size());
- }
- bool RunExchange(P224EncryptedKeyExchange* client,
- P224EncryptedKeyExchange* server,
- bool is_password_same) {
- for (;;) {
- std::string client_message, server_message;
- client_message = client->GetNextMessage();
- server_message = server->GetNextMessage();
- P224EncryptedKeyExchange::Result client_result, server_result;
- client_result = client->ProcessMessage(server_message);
- server_result = server->ProcessMessage(client_message);
- // Check that we never hit the case where only one succeeds.
- EXPECT_EQ(client_result == P224EncryptedKeyExchange::kResultSuccess,
- server_result == P224EncryptedKeyExchange::kResultSuccess);
- if (client_result == P224EncryptedKeyExchange::kResultFailed ||
- server_result == P224EncryptedKeyExchange::kResultFailed) {
- return false;
- }
- EXPECT_EQ(is_password_same,
- client->GetUnverifiedKey() == server->GetUnverifiedKey());
- if (client_result == P224EncryptedKeyExchange::kResultSuccess &&
- server_result == P224EncryptedKeyExchange::kResultSuccess) {
- return true;
- }
- EXPECT_EQ(P224EncryptedKeyExchange::kResultPending, client_result);
- EXPECT_EQ(P224EncryptedKeyExchange::kResultPending, server_result);
- }
- }
- const char kPassword[] = "foo";
- } // namespace
- TEST(MutualAuth, CorrectAuth) {
- P224EncryptedKeyExchange client(
- P224EncryptedKeyExchange::kPeerTypeClient, kPassword);
- P224EncryptedKeyExchange server(
- P224EncryptedKeyExchange::kPeerTypeServer, kPassword);
- EXPECT_TRUE(RunExchange(&client, &server, true));
- EXPECT_EQ(client.GetKey(), server.GetKey());
- }
- TEST(MutualAuth, IncorrectPassword) {
- P224EncryptedKeyExchange client(
- P224EncryptedKeyExchange::kPeerTypeClient,
- kPassword);
- P224EncryptedKeyExchange server(
- P224EncryptedKeyExchange::kPeerTypeServer,
- "wrongpassword");
- EXPECT_FALSE(RunExchange(&client, &server, false));
- }
- TEST(MutualAuth, ExpectedValues) {
- P224EncryptedKeyExchange client(P224EncryptedKeyExchange::kPeerTypeClient,
- kPassword);
- client.SetXForTesting("Client x");
- P224EncryptedKeyExchange server(P224EncryptedKeyExchange::kPeerTypeServer,
- kPassword);
- server.SetXForTesting("Server x");
- std::string client_message = client.GetNextMessage();
- EXPECT_EQ(
- "3508EF7DECC8AB9F9C439FBB0154288BBECC0A82E8448F4CF29554EB"
- "BE9D486686226255EAD1D077C635B1A41F46AC91D7F7F32CED9EC3E0",
- HexEncodeString(client_message));
- std::string server_message = server.GetNextMessage();
- EXPECT_EQ(
- "A3088C18B75D2C2B107105661AEC85424777475EB29F1DDFB8C14AFB"
- "F1603D0DF38413A00F420ACF2059E7997C935F5A957A193D09A2B584",
- HexEncodeString(server_message));
- EXPECT_EQ(P224EncryptedKeyExchange::kResultPending,
- client.ProcessMessage(server_message));
- EXPECT_EQ(P224EncryptedKeyExchange::kResultPending,
- server.ProcessMessage(client_message));
- EXPECT_EQ(client.GetUnverifiedKey(), server.GetUnverifiedKey());
- // Must stay the same. External implementations should be able to pair with.
- EXPECT_EQ(
- "CE7CCFC435CDA4F01EC8826788B1F8B82EF7D550A34696B371096E64"
- "C487D4FE193F7D1A6FF6820BC7F807796BA3889E8F999BBDEFC32FFA",
- HexEncodeString(server.GetUnverifiedKey()));
- EXPECT_TRUE(RunExchange(&client, &server, true));
- EXPECT_EQ(client.GetKey(), server.GetKey());
- }
- TEST(MutualAuth, Fuzz) {
- static const unsigned kIterations = 40;
- for (unsigned i = 0; i < kIterations; i++) {
- P224EncryptedKeyExchange client(
- P224EncryptedKeyExchange::kPeerTypeClient, kPassword);
- P224EncryptedKeyExchange server(
- P224EncryptedKeyExchange::kPeerTypeServer, kPassword);
- // We'll only be testing small values of i, but we don't want that to bias
- // the test coverage. So we disperse the value of i by multiplying by the
- // FNV, 32-bit prime, producing a simplistic PRNG.
- const uint32_t rand = i * 16777619;
- for (unsigned round = 0;; round++) {
- std::string client_message, server_message;
- client_message = client.GetNextMessage();
- server_message = server.GetNextMessage();
- if ((rand & 1) == round) {
- const bool server_or_client = rand & 2;
- std::string* m = server_or_client ? &server_message : &client_message;
- if (rand & 4) {
- // Truncate
- *m = m->substr(0, (i >> 3) % m->size());
- } else {
- // Corrupt
- const size_t bits = m->size() * 8;
- const size_t bit_to_corrupt = (rand >> 3) % bits;
- const_cast<char*>(m->data())[bit_to_corrupt / 8] ^=
- 1 << (bit_to_corrupt % 8);
- }
- }
- P224EncryptedKeyExchange::Result client_result, server_result;
- client_result = client.ProcessMessage(server_message);
- server_result = server.ProcessMessage(client_message);
- // If we have corrupted anything, we expect the authentication to fail,
- // although one side can succeed if we happen to corrupt the second round
- // message to the other.
- ASSERT_FALSE(
- client_result == P224EncryptedKeyExchange::kResultSuccess &&
- server_result == P224EncryptedKeyExchange::kResultSuccess);
- if (client_result == P224EncryptedKeyExchange::kResultFailed ||
- server_result == P224EncryptedKeyExchange::kResultFailed) {
- break;
- }
- ASSERT_EQ(P224EncryptedKeyExchange::kResultPending,
- client_result);
- ASSERT_EQ(P224EncryptedKeyExchange::kResultPending,
- server_result);
- }
- }
- }
- } // namespace crypto
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