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

quic/core/crypto/chacha_base_decrypter.h

diff --git a/quic/core/crypto/chacha_base_decrypter.h b/quic/core/crypto/chacha_base_decrypter.h
new file mode 100644
index 0000000..d7ad741
--- /dev/null
+++ b/quic/core/crypto/chacha_base_decrypter.h
@@ -0,0 +1,31 @@
+// 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.
+
+#ifndef QUICHE_QUIC_CORE_CRYPTO_CHACHA_BASE_DECRYPTER_H_
+#define QUICHE_QUIC_CORE_CRYPTO_CHACHA_BASE_DECRYPTER_H_
+
+#include <cstddef>
+
+#include "net/third_party/quiche/src/quic/core/crypto/aead_base_decrypter.h"
+#include "net/third_party/quiche/src/quic/platform/api/quic_export.h"
+#include "net/third_party/quiche/src/quic/platform/api/quic_string_piece.h"
+
+namespace quic {
+
+class QUIC_EXPORT_PRIVATE ChaChaBaseDecrypter : public AeadBaseDecrypter {
+ public:
+  using AeadBaseDecrypter::AeadBaseDecrypter;
+
+  bool SetHeaderProtectionKey(QuicStringPiece key) override;
+  std::string GenerateHeaderProtectionMask(
+      QuicDataReader* sample_reader) override;
+
+ private:
+  // The key used for packet number encryption.
+  unsigned char pne_key_[kMaxKeySize];
+};
+
+}  // namespace quic
+
+#endif  // QUICHE_QUIC_CORE_CRYPTO_CHACHA_BASE_DECRYPTER_H_