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// Copyright 2017 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_tls_encrypter.h"
#include <limits>
#include "openssl/evp.h"
namespace quic {
namespace {
const size_t kKeySize = 32;
const size_t kNonceSize = 12;
} // namespace
ChaCha20Poly1305TlsEncrypter::ChaCha20Poly1305TlsEncrypter()
: ChaChaBaseEncrypter(EVP_aead_chacha20_poly1305, kKeySize, kAuthTagSize,
kNonceSize,
/* use_ietf_nonce_construction */ true) {
static_assert(kKeySize <= kMaxKeySize, "key size too big");
static_assert(kNonceSize <= kMaxNonceSize, "nonce size too big");
}
ChaCha20Poly1305TlsEncrypter::~ChaCha20Poly1305TlsEncrypter() {}
QuicPacketCount ChaCha20Poly1305TlsEncrypter::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