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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_decrypter.h"
#include "net/quic/quic_utils.h"
#include "net/quic/quic_data_reader.h"
using base::StringPiece;
using std::string;
namespace net {
QuicData* NullDecrypter::Decrypt(StringPiece associated_data,
StringPiece ciphertext) {
QuicDataReader reader(ciphertext.data(), ciphertext.length());
uint128 hash;
if (!reader.ReadUInt128(&hash)) {
return NULL;
}
StringPiece plaintext = reader.ReadRemainingPayload();
// TODO(rch): avoid buffer copy here
string buffer = associated_data.as_string();
plaintext.AppendToString(&buffer);
if (hash != QuicUtils::FNV1a_128_Hash(buffer.data(), buffer.length())) {
return NULL;
}
return new QuicData(plaintext.data(), plaintext.length());
}
} // namespace net
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