Relocate QUICHE files into quiche/ directory within the quiche repo, and change the relative include paths accordingly.

PiperOrigin-RevId: 440164720
Change-Id: I64d8a975d08888a3a86f6c51908e63d5cd45fa35

quiche/quic/core/crypto/chacha20_poly1305_encrypter.cc

diff --git a/quiche/quic/core/crypto/chacha20_poly1305_encrypter.cc b/quiche/quic/core/crypto/chacha20_poly1305_encrypter.cc
new file mode 100644
index 0000000..dcfb523
--- /dev/null
+++ b/quiche/quic/core/crypto/chacha20_poly1305_encrypter.cc
@@ -0,0 +1,37 @@
+// Copyright 2014 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 "quiche/quic/core/crypto/chacha20_poly1305_encrypter.h"
+
+#include "third_party/boringssl/src/include/openssl/evp.h"
+
+namespace quic {
+
+namespace {
+
+const size_t kKeySize = 32;
+const size_t kNonceSize = 12;
+
+}  // namespace
+
+ChaCha20Poly1305Encrypter::ChaCha20Poly1305Encrypter()
+    : ChaChaBaseEncrypter(EVP_aead_chacha20_poly1305,
+                          kKeySize,
+                          kAuthTagSize,
+                          kNonceSize,
+                          /* use_ietf_nonce_construction */ false) {
+  static_assert(kKeySize <= kMaxKeySize, "key size too big");
+  static_assert(kNonceSize <= kMaxNonceSize, "nonce size too big");
+}
+
+ChaCha20Poly1305Encrypter::~ChaCha20Poly1305Encrypter() {}
+
+QuicPacketCount ChaCha20Poly1305Encrypter::GetConfidentialityLimit() const {
+  // For AEAD_CHACHA20_POLY1305, the confidentiality limit is greater than the
+  // number of possible packets (2^62) and so can be disregarded.
+  // https://quicwg.org/base-drafts/draft-ietf-quic-tls.html#name-limits-on-aead-usage
+  return std::numeric_limits<QuicPacketCount>::max();
+}
+
+}  // namespace quic