Add support for Header Protection to QuicCrypter classes
gfe-relnote: no behavior change (adds unused methods to QuicCrypter classes)
PiperOrigin-RevId: 239293044
Change-Id: I0365ad92962102714787b44d346f5c698900ead9
diff --git a/quic/core/crypto/chacha_base_encrypter.cc b/quic/core/crypto/chacha_base_encrypter.cc
new file mode 100644
index 0000000..24d79d5
--- /dev/null
+++ b/quic/core/crypto/chacha_base_encrypter.cc
@@ -0,0 +1,38 @@
+// 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 "net/third_party/quiche/src/quic/core/crypto/chacha_base_encrypter.h"
+
+#include "third_party/boringssl/src/include/openssl/chacha.h"
+#include "net/third_party/quiche/src/quic/core/quic_data_reader.h"
+#include "net/third_party/quiche/src/quic/platform/api/quic_bug_tracker.h"
+
+namespace quic {
+
+bool ChaChaBaseEncrypter::SetHeaderProtectionKey(QuicStringPiece key) {
+ if (key.size() != GetKeySize()) {
+ QUIC_BUG << "Invalid key size for header protection";
+ return false;
+ }
+ memcpy(pne_key_, key.data(), key.size());
+ return true;
+}
+
+std::string ChaChaBaseEncrypter::GenerateHeaderProtectionMask(
+ QuicStringPiece sample) {
+ if (sample.size() != 16) {
+ return std::string();
+ }
+ const uint8_t* nonce = reinterpret_cast<const uint8_t*>(sample.data()) + 4;
+ uint32_t counter;
+ QuicDataReader(sample.data(), 4, Endianness::HOST_BYTE_ORDER)
+ .ReadUInt32(&counter);
+ const uint8_t zeroes[] = {0, 0, 0, 0, 0};
+ std::string out(arraysize(zeroes), 0);
+ CRYPTO_chacha_20(reinterpret_cast<uint8_t*>(const_cast<char*>(out.data())),
+ zeroes, arraysize(zeroes), pne_key_, nonce, counter);
+ return out;
+}
+
+} // namespace quic
