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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/block_cipher.h>
#include <botan/stream_cipher.h>
#include <botan/mac.h>
#include <vector>
#include <functional>
#include <memory>
namespace Botan {
namespace TLS {
class Session_Keys;
/**
* TLS Cipher State
*/
class Connection_Cipher_State
{
public:
/**
* Initialize a new cipher state
*/
Connection_Cipher_State(Protocol_Version version,
Connection_Side side,
const Ciphersuite& suite,
const Session_Keys& keys);
BlockCipher* block_cipher() { return m_block_cipher.get(); }
StreamCipher* stream_cipher() { return m_stream_cipher.get(); }
MessageAuthenticationCode* mac() { return m_mac.get(); }
secure_vector<byte>& cbc_state() { return m_block_cipher_cbc_state; }
size_t block_size() const { return m_block_size; }
size_t mac_size() const { return m_mac->output_length(); }
size_t iv_size() const { return m_iv_size; }
private:
std::unique_ptr<BlockCipher> m_block_cipher;
secure_vector<byte> m_block_cipher_cbc_state;
std::unique_ptr<StreamCipher> m_stream_cipher;
std::unique_ptr<MessageAuthenticationCode> m_mac;
size_t m_block_size = 0;
size_t m_iv_size = 0;
};
/**
* Create a TLS record
* @param write_buffer the output record is placed here
* @param msg_type is the type of the message (handshake, alert, ...)
* @param msg is the plaintext message
* @param msg_length is the length of msg
* @param msg_sequence_number is the sequence number
* @param version is the protocol version
* @param cipherstate is the writing cipher state
* @param rng is a random number generator
* @return number of bytes written to write_buffer
*/
size_t write_record(std::vector<byte>& write_buffer,
byte msg_type, const byte msg[], size_t msg_length,
u64bit msg_sequence_number,
Protocol_Version version,
Connection_Cipher_State* cipherstate,
RandomNumberGenerator& rng);
/**
* Decode a TLS record
* @return zero if full message, else number of bytes still needed
*/
size_t read_record(std::vector<byte>& read_buffer,
size_t& read_buffer_position,
const byte input[],
size_t input_length,
size_t& input_consumed,
byte& msg_type,
std::vector<byte>& msg,
u64bit msg_sequence,
Protocol_Version version,
Connection_Cipher_State* cipherstate);
/**
* TLS Record Writer
*/
class BOTAN_DLL Record_Writer
{
public:
void send_array(byte type, const byte input[], size_t length);
void send(byte type, const std::vector<byte>& input)
{ send_array(type, &input[0], input.size()); }
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;
std::unique_ptr<Connection_Cipher_State> m_write_cipherstate;
RandomNumberGenerator& m_rng;
size_t m_max_fragment = MAX_PLAINTEXT_SIZE;
u64bit m_write_seq_no = 0;
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:
std::vector<byte> m_readbuf;
std::vector<byte> m_macbuf;
size_t m_readbuf_pos = 0;
std::unique_ptr<Connection_Cipher_State> m_read_cipherstate;
size_t m_max_fragment = MAX_PLAINTEXT_SIZE;
u64bit m_read_seq_no = 0;
Protocol_Version m_version;
};
}
}
#endif
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