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/*
* TLS Record Handling
* (C) 2004-2012 Jack Lloyd
*
* Released under the terms of the Botan license
*/
#ifndef BOTAN_TLS_RECORDS_H__
#define BOTAN_TLS_RECORDS_H__
#include <botan/tls_ciphersuite.h>
#include <botan/tls_alert.h>
#include <botan/tls_magic.h>
#include <botan/tls_version.h>
#include <botan/pipe.h>
#include <botan/mac.h>
#include <vector>
#include <functional>
#include <memory>
namespace Botan {
namespace TLS {
class Session_Keys;
/**
* TLS Record Writer
*/
class BOTAN_DLL Record_Writer
{
public:
void send(byte type, const byte input[], size_t length);
void send(byte type, byte val) { send(type, &val, 1); }
void send(byte type, const std::vector<byte>& input)
{ send(type, &input[0], input.size()); }
void send_alert(const Alert& alert);
void change_cipher_spec(Connection_Side side,
const Ciphersuite& suite,
const Session_Keys& keys,
byte compression_method);
void set_version(Protocol_Version version);
bool record_version_set() const { return m_version.valid(); }
void reset();
void set_maximum_fragment_size(size_t max_fragment);
Record_Writer(std::function<void (const byte[], size_t)> output_fn,
RandomNumberGenerator& rng);
Record_Writer(const Record_Writer&) = delete;
Record_Writer& operator=(const Record_Writer&) = delete;
private:
void send_record(byte type, const byte input[], size_t length);
std::function<void (const byte[], size_t)> m_output_fn;
std::vector<byte> m_writebuf;
Pipe m_cipher;
std::unique_ptr<MessageAuthenticationCode> m_mac;
RandomNumberGenerator& m_rng;
size_t m_block_size, m_mac_size, m_iv_size, m_max_fragment;
u64bit m_seq_no;
Protocol_Version m_version;
};
/**
* TLS Record Reader
*/
class BOTAN_DLL Record_Reader
{
public:
/**
* @param input new input data (may be NULL if input_size == 0)
* @param input_size size of input in bytes
* @param input_consumed is set to the number of bytes of input
* that were consumed
* @param msg_type is set to the type of the message just read if
* this function returns 0
* @param msg is set to the contents of the record
* @param msg_sequence is set to this records sequence number
* @return number of bytes still needed (minimum), or 0 if success
*/
size_t add_input(const byte input[], size_t input_size,
size_t& input_consumed,
byte& msg_type,
std::vector<byte>& msg,
u64bit& msg_sequence);
void change_cipher_spec(Connection_Side side,
const Ciphersuite& suite,
const Session_Keys& keys,
byte compression_method);
void set_version(Protocol_Version version);
Protocol_Version get_version() const;
void reset();
void set_maximum_fragment_size(size_t max_fragment);
Record_Reader();
Record_Reader(const Record_Reader&) = delete;
Record_Reader& operator=(const Record_Reader&) = delete;
private:
size_t fill_buffer_to(const byte*& input,
size_t& input_size,
size_t& input_consumed,
size_t desired);
std::vector<byte> m_readbuf;
std::vector<byte> m_macbuf;
size_t m_readbuf_pos;
Pipe m_cipher;
std::unique_ptr<MessageAuthenticationCode> m_mac;
size_t m_block_size, m_iv_size, m_max_fragment;
u64bit m_seq_no;
Protocol_Version m_version;
};
}
}
#endif
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