blob: 663056dd41e63a37c573cc18b396a9bfb3f5ef53 [file] [log] [blame]
// Copyright (c) 2013 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/core/crypto/aes_base_encrypter.h"
#include "absl/strings/string_view.h"
#include "third_party/boringssl/src/include/openssl/aes.h"
#include "quic/platform/api/quic_bug_tracker.h"
namespace quic {
bool AesBaseEncrypter::SetHeaderProtectionKey(absl::string_view key) {
if (key.size() != GetKeySize()) {
QUIC_BUG << "Invalid key size for header protection: " << key.size();
return false;
}
if (AES_set_encrypt_key(reinterpret_cast<const uint8_t*>(key.data()),
key.size() * 8, &pne_key_) != 0) {
QUIC_BUG << "Unexpected failure of AES_set_encrypt_key";
return false;
}
return true;
}
std::string AesBaseEncrypter::GenerateHeaderProtectionMask(
absl::string_view sample) {
if (sample.size() != AES_BLOCK_SIZE) {
return std::string();
}
std::string out(AES_BLOCK_SIZE, 0);
AES_encrypt(reinterpret_cast<const uint8_t*>(sample.data()),
reinterpret_cast<uint8_t*>(const_cast<char*>(out.data())),
&pne_key_);
return out;
}
QuicPacketCount AesBaseEncrypter::GetConfidentialityLimit() const {
// For AEAD_AES_128_GCM and AEAD_AES_256_GCM ... endpoints that do not send
// packets larger than 2^11 bytes cannot protect more than 2^28 packets.
// https://quicwg.org/base-drafts/draft-ietf-quic-tls.html#name-confidentiality-limit
static_assert(kMaxOutgoingPacketSize <= 2048,
"This key limit requires limits on encryption payload sizes");
return 268435456U;
}
} // namespace quic