Project import generated by Copybara.
PiperOrigin-RevId: 237361882
Change-Id: I109a68f44db867b20f8c6a7732b0ce657133e52a
diff --git a/quic/core/crypto/null_decrypter.cc b/quic/core/crypto/null_decrypter.cc
new file mode 100644
index 0000000..288d3c4
--- /dev/null
+++ b/quic/core/crypto/null_decrypter.cc
@@ -0,0 +1,115 @@
+// Copyright (c) 2012 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/third_party/quiche/src/quic/core/crypto/null_decrypter.h"
+
+#include <cstdint>
+
+#include "net/third_party/quiche/src/quic/core/quic_data_reader.h"
+#include "net/third_party/quiche/src/quic/core/quic_utils.h"
+#include "net/third_party/quiche/src/quic/platform/api/quic_bug_tracker.h"
+#include "net/third_party/quiche/src/quic/platform/api/quic_uint128.h"
+
+namespace quic {
+
+NullDecrypter::NullDecrypter(Perspective perspective)
+ : perspective_(perspective) {}
+
+bool NullDecrypter::SetKey(QuicStringPiece key) {
+ return key.empty();
+}
+
+bool NullDecrypter::SetNoncePrefix(QuicStringPiece nonce_prefix) {
+ return nonce_prefix.empty();
+}
+
+bool NullDecrypter::SetIV(QuicStringPiece iv) {
+ return iv.empty();
+}
+
+bool NullDecrypter::SetPreliminaryKey(QuicStringPiece key) {
+ QUIC_BUG << "Should not be called";
+ return false;
+}
+
+bool NullDecrypter::SetDiversificationNonce(const DiversificationNonce& nonce) {
+ QUIC_BUG << "Should not be called";
+ return true;
+}
+
+bool NullDecrypter::DecryptPacket(uint64_t /*packet_number*/,
+ QuicStringPiece associated_data,
+ QuicStringPiece ciphertext,
+ char* output,
+ size_t* output_length,
+ size_t max_output_length) {
+ QuicDataReader reader(ciphertext.data(), ciphertext.length(),
+ HOST_BYTE_ORDER);
+ QuicUint128 hash;
+
+ if (!ReadHash(&reader, &hash)) {
+ return false;
+ }
+
+ QuicStringPiece plaintext = reader.ReadRemainingPayload();
+ if (plaintext.length() > max_output_length) {
+ QUIC_BUG << "Output buffer must be larger than the plaintext.";
+ return false;
+ }
+ if (hash != ComputeHash(associated_data, plaintext)) {
+ return false;
+ }
+ // Copy the plaintext to output.
+ memcpy(output, plaintext.data(), plaintext.length());
+ *output_length = plaintext.length();
+ return true;
+}
+
+size_t NullDecrypter::GetKeySize() const {
+ return 0;
+}
+
+size_t NullDecrypter::GetIVSize() const {
+ return 0;
+}
+
+QuicStringPiece NullDecrypter::GetKey() const {
+ return QuicStringPiece();
+}
+
+QuicStringPiece NullDecrypter::GetNoncePrefix() const {
+ return QuicStringPiece();
+}
+
+uint32_t NullDecrypter::cipher_id() const {
+ return 0;
+}
+
+bool NullDecrypter::ReadHash(QuicDataReader* reader, QuicUint128* hash) {
+ uint64_t lo;
+ uint32_t hi;
+ if (!reader->ReadUInt64(&lo) || !reader->ReadUInt32(&hi)) {
+ return false;
+ }
+ *hash = MakeQuicUint128(hi, lo);
+ return true;
+}
+
+QuicUint128 NullDecrypter::ComputeHash(const QuicStringPiece data1,
+ const QuicStringPiece data2) const {
+ QuicUint128 correct_hash;
+ if (perspective_ == Perspective::IS_CLIENT) {
+ // Peer is a server.
+ correct_hash = QuicUtils::FNV1a_128_Hash_Three(data1, data2, "Server");
+ } else {
+ // Peer is a client.
+ correct_hash = QuicUtils::FNV1a_128_Hash_Three(data1, data2, "Client");
+ }
+ QuicUint128 mask = MakeQuicUint128(UINT64_C(0x0), UINT64_C(0xffffffff));
+ mask <<= 96;
+ correct_hash &= ~mask;
+ return correct_hash;
+}
+
+} // namespace quic
