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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.
#ifndef NET_QUIC_CRYPTO_NULL_DECRYPTER_H_
#define NET_QUIC_CRYPTO_NULL_DECRYPTER_H_
#include "base/compiler_specific.h"
#include "net/base/net_export.h"
#include "net/quic/crypto/quic_decrypter.h"
namespace net {
class QuicDataReader;
// A NullDecrypter is a QuicDecrypter used before a crypto negotiation
// has occurred. It does not actually decrypt the payload, but does
// verify a hash (fnv128) over both the payload and associated data.
class NET_EXPORT_PRIVATE NullDecrypter : public QuicDecrypter {
public:
NullDecrypter();
virtual ~NullDecrypter() {}
// QuicDecrypter implementation
virtual bool SetKey(base::StringPiece key) OVERRIDE;
virtual bool SetNoncePrefix(base::StringPiece nonce_prefix) OVERRIDE;
virtual bool Decrypt(base::StringPiece nonce,
base::StringPiece associated_data,
base::StringPiece ciphertext,
unsigned char* output,
size_t* output_length) OVERRIDE;
virtual QuicData* DecryptPacket(QuicPacketSequenceNumber sequence_number,
base::StringPiece associated_data,
base::StringPiece ciphertext) OVERRIDE;
virtual base::StringPiece GetKey() const OVERRIDE;
virtual base::StringPiece GetNoncePrefix() const OVERRIDE;
private:
bool ReadHash(QuicDataReader* reader, uint128* hash);
uint128 ComputeHash(const std::string& data) const;
DISALLOW_COPY_AND_ASSIGN(NullDecrypter);
};
} // namespace net
#endif // NET_QUIC_CRYPTO_NULL_DECRYPTER_H_
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