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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/crypto/null_encrypter.h"
#include "net/quic/quic_data_writer.h"
#include "net/quic/quic_utils.h"
using base::StringPiece;
using std::string;
namespace net {
const size_t kHashSize = 16; // size of uint128 serialized
bool NullEncrypter::SetKey(StringPiece key) {
return key.empty();
}
bool NullEncrypter::SetNoncePrefix(StringPiece nonce_prefix) {
return nonce_prefix.empty();
}
QuicData* NullEncrypter::Encrypt(QuicPacketSequenceNumber /*sequence_number*/,
StringPiece associated_data,
StringPiece plaintext) {
// TODO(rch): avoid buffer copy here
string buffer = associated_data.as_string();
plaintext.AppendToString(&buffer);
uint128 hash = QuicUtils::FNV1a_128_Hash(buffer.data(), buffer.length());
QuicDataWriter writer(plaintext.length() + kHashSize);
writer.WriteUInt128(hash);
writer.WriteBytes(plaintext.data(), plaintext.length());
size_t len = writer.length();
return new QuicData(writer.take(), len, true);
}
size_t NullEncrypter::GetKeySize() const {
return 0;
}
size_t NullEncrypter::GetNoncePrefixSize() const {
return 0;
}
size_t NullEncrypter::GetMaxPlaintextSize(size_t ciphertext_size) const {
return ciphertext_size - kHashSize;
}
size_t NullEncrypter::GetCiphertextSize(size_t plaintext_size) const {
return plaintext_size + kHashSize;
}
} // namespace net
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