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// Copyright (c) 2020 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 "quic/test_tools/test_ticket_crypter.h"
#include <cstring>
#include "absl/base/macros.h"
#include "quic/core/crypto/quic_random.h"
namespace quic {
namespace test {
namespace {
// A TicketCrypter implementation is supposed to encrypt and decrypt session
// tickets. However, the only requirement that is needed of a test
// implementation is that calling Decrypt(Encrypt(input), callback) results in
// callback being called with input. (The output of Encrypt must also not exceed
// the overhead specified by MaxOverhead.) This test implementation encrypts
// tickets by prepending kTicketPrefix to generate the ciphertext. The decrypt
// function checks that the prefix is present and strips it; otherwise it
// returns an empty vector to signal failure.
constexpr char kTicketPrefix[] = "TEST TICKET";
} // namespace
TestTicketCrypter::TestTicketCrypter()
: ticket_prefix_(ABSL_ARRAYSIZE(kTicketPrefix) + 16) {
memcpy(ticket_prefix_.data(), kTicketPrefix, ABSL_ARRAYSIZE(kTicketPrefix));
QuicRandom::GetInstance()->RandBytes(
ticket_prefix_.data() + ABSL_ARRAYSIZE(kTicketPrefix), 16);
}
size_t TestTicketCrypter::MaxOverhead() {
return ticket_prefix_.size();
}
std::vector<uint8_t> TestTicketCrypter::Encrypt(absl::string_view in) {
size_t prefix_len = ticket_prefix_.size();
std::vector<uint8_t> out(prefix_len + in.size());
memcpy(out.data(), ticket_prefix_.data(), prefix_len);
memcpy(out.data() + prefix_len, in.data(), in.size());
return out;
}
std::vector<uint8_t> TestTicketCrypter::Decrypt(absl::string_view in) {
size_t prefix_len = ticket_prefix_.size();
if (fail_decrypt_ || in.size() < prefix_len ||
memcmp(ticket_prefix_.data(), in.data(), prefix_len) != 0) {
return std::vector<uint8_t>();
}
return std::vector<uint8_t>(in.begin() + prefix_len, in.end());
}
void TestTicketCrypter::Decrypt(
absl::string_view in,
std::unique_ptr<ProofSource::DecryptCallback> callback) {
auto decrypted_ticket = Decrypt(in);
if (run_async_) {
pending_callbacks_.push_back({std::move(callback), decrypted_ticket});
} else {
callback->Run(decrypted_ticket);
}
}
void TestTicketCrypter::SetRunCallbacksAsync(bool run_async) {
run_async_ = run_async;
}
size_t TestTicketCrypter::NumPendingCallbacks() {
return pending_callbacks_.size();
}
void TestTicketCrypter::RunPendingCallback(size_t n) {
const PendingCallback& callback = pending_callbacks_[n];
callback.callback->Run(callback.decrypted_ticket);
}
} // namespace test
} // namespace quic
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