| // 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 <limits> |
| |
| #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 |