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// Copyright (c) 2012 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/quic/core/crypto/null_encrypter.h"
#include "net/quic/core/quic_data_writer.h"
#include "net/quic/core/quic_utils.h"
using std::string;
namespace net {
const size_t kHashSizeShort = 12; // size of uint128 serialized short
NullEncrypter::NullEncrypter(Perspective perspective)
: perspective_(perspective) {}
bool NullEncrypter::SetKey(QuicStringPiece key) {
return key.empty();
}
bool NullEncrypter::SetNoncePrefix(QuicStringPiece nonce_prefix) {
return nonce_prefix.empty();
}
bool NullEncrypter::SetIV(QuicStringPiece iv) {
return iv.empty();
}
bool NullEncrypter::EncryptPacket(QuicTransportVersion version,
QuicPacketNumber /*packet_number*/,
QuicStringPiece associated_data,
QuicStringPiece plaintext,
char* output,
size_t* output_length,
size_t max_output_length) {
const size_t len = plaintext.size() + GetHashLength();
if (max_output_length < len) {
return false;
}
uint128 hash;
if (version > QUIC_VERSION_35) {
if (perspective_ == Perspective::IS_SERVER) {
hash =
QuicUtils::FNV1a_128_Hash_Three(associated_data, plaintext, "Server");
} else {
hash =
QuicUtils::FNV1a_128_Hash_Three(associated_data, plaintext, "Client");
}
} else {
hash = QuicUtils::FNV1a_128_Hash_Two(associated_data, plaintext);
}
// TODO(ianswett): memmove required for in place encryption. Placing the
// hash at the end would allow use of memcpy, doing nothing for in place.
memmove(output + GetHashLength(), plaintext.data(), plaintext.length());
QuicUtils::SerializeUint128Short(hash,
reinterpret_cast<unsigned char*>(output));
*output_length = len;
return true;
}
size_t NullEncrypter::GetKeySize() const {
return 0;
}
size_t NullEncrypter::GetNoncePrefixSize() const {
return 0;
}
size_t NullEncrypter::GetIVSize() const {
return 0;
}
size_t NullEncrypter::GetMaxPlaintextSize(size_t ciphertext_size) const {
return ciphertext_size - GetHashLength();
}
size_t NullEncrypter::GetCiphertextSize(size_t plaintext_size) const {
return plaintext_size + GetHashLength();
}
QuicStringPiece NullEncrypter::GetKey() const {
return QuicStringPiece();
}
QuicStringPiece NullEncrypter::GetNoncePrefix() const {
return QuicStringPiece();
}
size_t NullEncrypter::GetHashLength() const {
return kHashSizeShort;
}
} // namespace net
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