Botan  2.13.0
Crypto and TLS for C++11
Public Member Functions | List of all members
Botan::TLS::Datagram_Sequence_Numbers Class Referencefinal

#include <tls_seq_numbers.h>

Inheritance diagram for Botan::TLS::Datagram_Sequence_Numbers:
Botan::TLS::Connection_Sequence_Numbers

Public Member Functions

bool already_seen (uint64_t sequence) const override
 
uint16_t current_read_epoch () const override
 
uint16_t current_write_epoch () const override
 
 Datagram_Sequence_Numbers ()
 
void new_read_cipher_state () override
 
void new_write_cipher_state () override
 
uint64_t next_read_sequence () override
 
uint64_t next_write_sequence (uint16_t epoch) override
 
void read_accept (uint64_t sequence) override
 
void reset () override
 

Detailed Description

Definition at line 70 of file tls_seq_numbers.h.

Constructor & Destructor Documentation

◆ Datagram_Sequence_Numbers()

Botan::TLS::Datagram_Sequence_Numbers::Datagram_Sequence_Numbers ( )
inline

Definition at line 73 of file tls_seq_numbers.h.

References reset().

Member Function Documentation

◆ already_seen()

bool Botan::TLS::Datagram_Sequence_Numbers::already_seen ( uint64_t  sequence) const
inlineoverridevirtual

Implements Botan::TLS::Connection_Sequence_Numbers.

Definition at line 108 of file tls_seq_numbers.h.

109  {
110  const size_t window_size = sizeof(m_window_bits) * 8;
111 
112  if(sequence > m_window_highest)
113  {
114  return false;
115  }
116 
117  const uint64_t offset = m_window_highest - sequence;
118 
119  if(offset >= window_size)
120  {
121  return true; // really old?
122  }
123 
124  return (((m_window_bits >> offset) & 1) == 1);
125  }

◆ current_read_epoch()

uint16_t Botan::TLS::Datagram_Sequence_Numbers::current_read_epoch ( ) const
inlineoverridevirtual

Implements Botan::TLS::Connection_Sequence_Numbers.

Definition at line 93 of file tls_seq_numbers.h.

93 { return m_read_epoch; }

◆ current_write_epoch()

uint16_t Botan::TLS::Datagram_Sequence_Numbers::current_write_epoch ( ) const
inlineoverridevirtual

Implements Botan::TLS::Connection_Sequence_Numbers.

Definition at line 94 of file tls_seq_numbers.h.

94 { return m_write_epoch; }

◆ new_read_cipher_state()

void Botan::TLS::Datagram_Sequence_Numbers::new_read_cipher_state ( )
inlineoverridevirtual

Implements Botan::TLS::Connection_Sequence_Numbers.

Definition at line 85 of file tls_seq_numbers.h.

85 { m_read_epoch++; }

◆ new_write_cipher_state()

void Botan::TLS::Datagram_Sequence_Numbers::new_write_cipher_state ( )
inlineoverridevirtual

Implements Botan::TLS::Connection_Sequence_Numbers.

Definition at line 87 of file tls_seq_numbers.h.

88  {
89  m_write_epoch++;
90  m_write_seqs[m_write_epoch] = 0;
91  }

◆ next_read_sequence()

uint64_t Botan::TLS::Datagram_Sequence_Numbers::next_read_sequence ( )
inlineoverridevirtual

Implements Botan::TLS::Connection_Sequence_Numbers.

Definition at line 103 of file tls_seq_numbers.h.

104  {
105  throw Invalid_State("DTLS uses explicit sequence numbers");
106  }

◆ next_write_sequence()

uint64_t Botan::TLS::Datagram_Sequence_Numbers::next_write_sequence ( uint16_t  epoch)
inlineoverridevirtual

Implements Botan::TLS::Connection_Sequence_Numbers.

Definition at line 96 of file tls_seq_numbers.h.

References BOTAN_ASSERT.

97  {
98  auto i = m_write_seqs.find(epoch);
99  BOTAN_ASSERT(i != m_write_seqs.end(), "Found epoch");
100  return (static_cast<uint64_t>(epoch) << 48) | i->second++;
101  }
#define BOTAN_ASSERT(expr, assertion_made)
Definition: assert.h:55

◆ read_accept()

void Botan::TLS::Datagram_Sequence_Numbers::read_accept ( uint64_t  sequence)
inlineoverridevirtual

Implements Botan::TLS::Connection_Sequence_Numbers.

Definition at line 127 of file tls_seq_numbers.h.

128  {
129  const size_t window_size = sizeof(m_window_bits) * 8;
130 
131  if(sequence > m_window_highest)
132  {
133  const uint64_t offset = sequence - m_window_highest;
134  m_window_highest += offset;
135 
136  if(offset >= window_size)
137  m_window_bits = 0;
138  else
139  m_window_bits <<= offset;
140 
141  m_window_bits |= 0x01;
142  }
143  else
144  {
145  const uint64_t offset = m_window_highest - sequence;
146  m_window_bits |= (static_cast<uint64_t>(1) << offset);
147  }
148  }

◆ reset()

void Botan::TLS::Datagram_Sequence_Numbers::reset ( )
inlineoverridevirtual

Implements Botan::TLS::Connection_Sequence_Numbers.

Definition at line 75 of file tls_seq_numbers.h.

Referenced by Datagram_Sequence_Numbers().

76  {
77  m_write_seqs.clear();
78  m_write_seqs[0] = 0;
79  m_write_epoch = 0;
80  m_read_epoch = 0;
81  m_window_highest = 0;
82  m_window_bits = 0;
83  }

The documentation for this class was generated from the following file: