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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_magic.h>
#include <botan/tls_version.h>
#include <botan/block_cipher.h>
#include <botan/stream_cipher.h>
#include <botan/mac.h>
#include <vector>
#include <memory>
#include <chrono>
namespace Botan {
namespace TLS {
class Ciphersuite;
class Session_Keys;
class Connection_Sequence_Numbers;
/**
* 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; }
bool mac_includes_record_version() const { return !m_is_ssl3; }
bool cipher_padding_single_byte() const { return m_is_ssl3; }
bool cbc_without_explicit_iv() const
{ return (m_block_size > 0) && (m_iv_size == 0); }
std::chrono::seconds age() const
{
return std::chrono::duration_cast<std::chrono::seconds>(
std::chrono::system_clock::now() - m_start_time);
}
private:
std::chrono::system_clock::time_point m_start_time;
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;
bool m_is_ssl3 = false;
};
class Record
{
public:
Record() {}
Record(u64bit sequence,
Protocol_Version version,
Record_Type type,
const byte contents[],
size_t contents_size) :
m_sequence(sequence),
m_version(version),
m_type(type),
m_contents(contents, contents + contents_size) {}
Record(u64bit sequence,
Protocol_Version version,
Record_Type type,
std::vector<byte>&& contents) :
m_sequence(sequence),
m_version(version),
m_type(type),
m_contents(contents) {}
bool is_valid() const { return m_type != NO_RECORD; }
u64bit sequence() const { return m_sequence; }
Record_Type type() const { return m_type; }
Protocol_Version version() const { return m_version; }
const std::vector<byte>& contents() const { return m_contents; }
const byte* bits() const { return &m_contents[0]; }
size_t size() const { return m_contents.size(); }
private:
u64bit m_sequence = 0;
Protocol_Version m_version = Protocol_Version();
Record_Type m_type = NO_RECORD;
std::vector<byte> m_contents;
};
/**
* 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
*/
void write_record(std::vector<byte>& write_buffer,
byte msg_type, const byte msg[], size_t msg_length,
Protocol_Version version,
u64bit msg_sequence,
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,
const byte input[],
size_t input_length,
size_t& input_consumed,
Record& output_record,
Connection_Sequence_Numbers* sequence_numbers,
std::function<Connection_Cipher_State* (u16bit)> get_cipherstate);
}
}
#endif
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