Botan  2.1.0
Crypto and TLS for C++11
Public Member Functions | Protected Member Functions | List of all members
Botan::TLS::TLS_CBC_HMAC_AEAD_Encryption Class Referencefinal

#include <tls_cbc.h>

Inheritance diagram for Botan::TLS::TLS_CBC_HMAC_AEAD_Encryption:
Botan::TLS::TLS_CBC_HMAC_AEAD_Mode Botan::AEAD_Mode Botan::Cipher_Mode

Public Member Functions

bool authenticated () const override
 
void clear () overridefinal
 
size_t default_nonce_length () const overridefinal
 
void finish (secure_vector< uint8_t > &final_block, size_t offset=0) override
 
Key_Length_Specification key_spec () const overridefinal
 
size_t minimum_final_size () const override
 
std::string name () const overridefinal
 
size_t output_length (size_t input_length) const override
 
size_t process (uint8_t buf[], size_t sz) overridefinal
 
virtual std::string provider () const
 
void reset () overridefinal
 
template<typename Alloc >
void set_ad (const std::vector< uint8_t, Alloc > &ad)
 
void set_associated_data (const uint8_t ad[], size_t ad_len) override
 
template<typename Alloc >
void set_associated_data_vec (const std::vector< uint8_t, Alloc > &ad)
 
template<typename Alloc >
void set_key (const std::vector< uint8_t, Alloc > &key)
 
void set_key (const SymmetricKey &key)
 
void set_key (const uint8_t key[], size_t length)
 
template<typename Alloc >
void start (const std::vector< uint8_t, Alloc > &nonce)
 
void start (const uint8_t nonce[], size_t nonce_len)
 
void start ()
 
size_t tag_size () const overridefinal
 
 TLS_CBC_HMAC_AEAD_Encryption (const std::string &cipher_algo, const size_t cipher_keylen, const std::string &mac_algo, const size_t mac_keylen, bool use_explicit_iv, bool use_encrypt_then_mac)
 
void update (secure_vector< uint8_t > &buffer, size_t offset=0)
 
size_t update_granularity () const overridefinal
 
bool valid_keylength (size_t length) const
 
bool valid_nonce_length (size_t nl) const overridefinal
 

Protected Member Functions

std::vector< uint8_t > & assoc_data ()
 
std::vector< uint8_t > assoc_data_with_len (uint16_t len)
 
size_t block_size () const
 
secure_vector< uint8_t > & cbc_state ()
 
BlockCiphercipher () const
 
size_t cipher_keylen () const
 
size_t iv_size () const
 
MessageAuthenticationCodemac () const
 
size_t mac_keylen () const
 
secure_vector< uint8_t > & msg ()
 
bool use_encrypt_then_mac () const
 

Detailed Description

TLS_CBC_HMAC_AEAD Encryption

Definition at line 105 of file tls_cbc.h.

Constructor & Destructor Documentation

Botan::TLS::TLS_CBC_HMAC_AEAD_Encryption::TLS_CBC_HMAC_AEAD_Encryption ( const std::string &  cipher_algo,
const size_t  cipher_keylen,
const std::string &  mac_algo,
const size_t  mac_keylen,
bool  use_explicit_iv,
bool  use_encrypt_then_mac 
)
inline

Definition at line 110 of file tls_cbc.h.

115  :
116  TLS_CBC_HMAC_AEAD_Mode(cipher_algo,
118  mac_algo,
119  mac_keylen,
120  use_explicit_iv,
122  {}
TLS_CBC_HMAC_AEAD_Mode(const std::string &cipher_name, size_t cipher_keylen, const std::string &mac_name, size_t mac_keylen, bool use_explicit_iv, bool use_encrypt_then_mac)
Definition: tls_cbc.cpp:25
bool use_encrypt_then_mac() const
Definition: tls_cbc.h:60
size_t cipher_keylen() const
Definition: tls_cbc.h:55

Member Function Documentation

std::vector<uint8_t>& Botan::TLS::TLS_CBC_HMAC_AEAD_Mode::assoc_data ( )
inlineprotectedinherited

Definition at line 75 of file tls_cbc.h.

Referenced by finish(), and set_associated_data().

75 { return m_ad; }
std::vector< uint8_t > Botan::TLS::TLS_CBC_HMAC_AEAD_Mode::assoc_data_with_len ( uint16_t  len)
protectedinherited

Definition at line 114 of file tls_cbc.cpp.

References BOTAN_ASSERT, and Botan::get_byte().

Referenced by Botan::TLS::TLS_CBC_HMAC_AEAD_Decryption::finish().

115  {
116  std::vector<uint8_t> ad = m_ad;
117  BOTAN_ASSERT(ad.size() == 13, "Expected AAD size");
118  ad[11] = get_byte(0, len);
119  ad[12] = get_byte(1, len);
120  return ad;
121  }
#define BOTAN_ASSERT(expr, assertion_made)
Definition: assert.h:27
uint8_t get_byte(size_t byte_num, T input)
Definition: loadstor.h:47
bool Botan::AEAD_Mode::authenticated ( ) const
inlineoverridevirtualinherited
Returns
true iff this mode provides authentication as well as confidentiality.

Reimplemented from Botan::Cipher_Mode.

Definition at line 25 of file aead.h.

25 { return true; }
size_t Botan::TLS::TLS_CBC_HMAC_AEAD_Mode::block_size ( ) const
inlineprotectedinherited
secure_vector<uint8_t>& Botan::TLS::TLS_CBC_HMAC_AEAD_Mode::cbc_state ( )
inlineprotectedinherited

Definition at line 74 of file tls_cbc.h.

Referenced by finish(), Botan::TLS::TLS_CBC_HMAC_AEAD_Decryption::finish(), and Botan::TLS::TLS_CBC_HMAC_AEAD_Mode::reset().

74 { return m_cbc_state; }
BlockCipher& Botan::TLS::TLS_CBC_HMAC_AEAD_Mode::cipher ( ) const
inlineprotectedinherited

Definition at line 62 of file tls_cbc.h.

References BOTAN_ASSERT_NONNULL.

Referenced by Botan::TLS::TLS_CBC_HMAC_AEAD_Mode::clear().

63  {
64  BOTAN_ASSERT_NONNULL(m_cipher);
65  return *m_cipher;
66  }
#define BOTAN_ASSERT_NONNULL(ptr)
Definition: assert.h:79
size_t Botan::TLS::TLS_CBC_HMAC_AEAD_Mode::cipher_keylen ( ) const
inlineprotectedinherited

Definition at line 55 of file tls_cbc.h.

55 { return m_cipher_keylen; }
void Botan::TLS::TLS_CBC_HMAC_AEAD_Mode::clear ( )
finaloverridevirtualinherited

Zeroise all state See also reset_msg()

Implements Botan::Cipher_Mode.

Definition at line 46 of file tls_cbc.cpp.

References Botan::TLS::TLS_CBC_HMAC_AEAD_Mode::cipher(), Botan::SymmetricAlgorithm::clear(), Botan::TLS::TLS_CBC_HMAC_AEAD_Mode::mac(), and Botan::TLS::TLS_CBC_HMAC_AEAD_Mode::reset().

47  {
48  cipher().clear();
49  mac().clear();
50  reset();
51  }
BlockCipher & cipher() const
Definition: tls_cbc.h:62
MessageAuthenticationCode & mac() const
Definition: tls_cbc.h:68
virtual void clear()=0
void reset() overridefinal
Definition: tls_cbc.cpp:53
size_t Botan::TLS::TLS_CBC_HMAC_AEAD_Mode::default_nonce_length ( ) const
inlinefinaloverridevirtualinherited
Returns
default AEAD nonce size (a commonly supported value among AEAD modes, and large enough that random collisions are unlikely)

Reimplemented from Botan::AEAD_Mode.

Definition at line 41 of file tls_cbc.h.

41 { return m_iv_size; }
void Botan::TLS::TLS_CBC_HMAC_AEAD_Encryption::finish ( secure_vector< uint8_t > &  final_block,
size_t  offset = 0 
)
overridevirtual

Complete processing of a message.

Parameters
final_blockin/out parameter which must be at least minimum_final_size() bytes, and will be set to any final output
offsetan offset into final_block to begin processing

Implements Botan::Cipher_Mode.

Definition at line 168 of file tls_cbc.cpp.

References Botan::TLS::TLS_CBC_HMAC_AEAD_Mode::assoc_data(), Botan::TLS::TLS_CBC_HMAC_AEAD_Mode::block_size(), BOTAN_ASSERT, Botan::TLS::TLS_CBC_HMAC_AEAD_Mode::cbc_state(), Botan::Buffered_Computation::final(), Botan::TLS::TLS_CBC_HMAC_AEAD_Mode::iv_size(), Botan::TLS::TLS_CBC_HMAC_AEAD_Mode::mac(), Botan::TLS::TLS_CBC_HMAC_AEAD_Mode::msg(), Botan::round_up(), Botan::TLS::TLS_CBC_HMAC_AEAD_Mode::tag_size(), Botan::Buffered_Computation::update(), Botan::Cipher_Mode::update(), and Botan::TLS::TLS_CBC_HMAC_AEAD_Mode::use_encrypt_then_mac().

169  {
170  update(buffer, offset);
171  buffer.resize(offset); // truncate, leaving just header
172  const size_t header_size = offset;
173 
174  buffer.insert(buffer.end(), msg().begin(), msg().end());
175 
176  const size_t input_size = msg().size() + 1 + (use_encrypt_then_mac() ? 0 : tag_size());
177  const size_t enc_size = round_up(input_size, block_size());
178  const size_t pad_val = enc_size - input_size;
179  const size_t buf_size = enc_size + (use_encrypt_then_mac() ? tag_size() : 0);
180 
181  BOTAN_ASSERT(enc_size % block_size() == 0,
182  "Buffer is an even multiple of block size");
183 
184  mac().update(assoc_data());
185 
187  {
188  if(iv_size() > 0)
189  {
190  mac().update(cbc_state());
191  }
192 
193  for(size_t i = 0; i != pad_val + 1; ++i)
194  buffer.push_back(static_cast<uint8_t>(pad_val));
195  cbc_encrypt_record(&buffer[header_size], enc_size);
196  }
197 
198  // EtM also uses ciphertext size instead of plaintext size for AEAD input
199  const uint8_t* mac_input = (use_encrypt_then_mac() ? &buffer[header_size] : msg().data());
200  const size_t mac_input_len = (use_encrypt_then_mac() ? enc_size : msg().size());
201 
202  mac().update(mac_input, mac_input_len);
203 
204  buffer.resize(buffer.size() + tag_size());
205  mac().final(&buffer[buffer.size() - tag_size()]);
206 
207  if(use_encrypt_then_mac() == false)
208  {
209  for(size_t i = 0; i != pad_val + 1; ++i)
210  buffer.push_back(static_cast<uint8_t>(pad_val));
211  cbc_encrypt_record(&buffer[header_size], buf_size);
212  }
213  }
void update(secure_vector< uint8_t > &buffer, size_t offset=0)
Definition: cipher_mode.h:81
size_t tag_size() const overridefinal
Definition: tls_cbc.h:39
MessageAuthenticationCode & mac() const
Definition: tls_cbc.h:68
#define BOTAN_ASSERT(expr, assertion_made)
Definition: assert.h:27
secure_vector< uint8_t > & cbc_state()
Definition: tls_cbc.h:74
void final(uint8_t out[])
Definition: buf_comp.h:89
std::vector< uint8_t > & assoc_data()
Definition: tls_cbc.h:75
bool use_encrypt_then_mac() const
Definition: tls_cbc.h:60
void update(const uint8_t in[], size_t length)
Definition: buf_comp.h:34
secure_vector< uint8_t > & msg()
Definition: tls_cbc.h:76
size_t round_up(size_t n, size_t align_to)
Definition: rounding.h:22
size_t Botan::TLS::TLS_CBC_HMAC_AEAD_Mode::iv_size ( ) const
inlineprotectedinherited
Key_Length_Specification Botan::TLS::TLS_CBC_HMAC_AEAD_Mode::key_spec ( ) const
finaloverridevirtualinherited
Returns
object describing limits on key size

Implements Botan::Cipher_Mode.

Definition at line 77 of file tls_cbc.cpp.

78  {
79  return Key_Length_Specification(m_cipher_keylen + m_mac_keylen);
80  }
MessageAuthenticationCode& Botan::TLS::TLS_CBC_HMAC_AEAD_Mode::mac ( ) const
inlineprotectedinherited

Definition at line 68 of file tls_cbc.h.

References BOTAN_ASSERT_NONNULL, and m_mac.

Referenced by Botan::TLS::TLS_CBC_HMAC_AEAD_Mode::clear(), finish(), and Botan::TLS::TLS_CBC_HMAC_AEAD_Decryption::finish().

69  {
71  return *m_mac;
72  }
std::unique_ptr< MessageAuthenticationCode > m_mac
Definition: fpe_fe1.cpp:88
#define BOTAN_ASSERT_NONNULL(ptr)
Definition: assert.h:79
size_t Botan::TLS::TLS_CBC_HMAC_AEAD_Mode::mac_keylen ( ) const
inlineprotectedinherited

Definition at line 56 of file tls_cbc.h.

56 { return m_mac_keylen; }
size_t Botan::TLS::TLS_CBC_HMAC_AEAD_Encryption::minimum_final_size ( ) const
inlineoverridevirtual
Returns
required minimium size to finalize() - may be any length larger than this.

Implements Botan::Cipher_Mode.

Definition at line 128 of file tls_cbc.h.

128 { return 0; }
secure_vector<uint8_t>& Botan::TLS::TLS_CBC_HMAC_AEAD_Mode::msg ( )
inlineprotectedinherited

Definition at line 76 of file tls_cbc.h.

Referenced by finish(), and Botan::TLS::TLS_CBC_HMAC_AEAD_Decryption::finish().

76 { return m_msg; }
std::string Botan::TLS::TLS_CBC_HMAC_AEAD_Mode::name ( ) const
finaloverridevirtualinherited

Implements Botan::Cipher_Mode.

Definition at line 60 of file tls_cbc.cpp.

61  {
62  return "TLS_CBC(" + m_cipher_name + "," + m_mac_name + ")";
63  }
std::string m_cipher_name
size_t Botan::TLS::TLS_CBC_HMAC_AEAD_Encryption::output_length ( size_t  input_length) const
overridevirtual

Returns the size of the output if this transform is used to process a message with input_length bytes. Will throw if unable to give a precise answer.

Implements Botan::Cipher_Mode.

Definition at line 162 of file tls_cbc.cpp.

References Botan::TLS::TLS_CBC_HMAC_AEAD_Mode::block_size(), Botan::round_up(), Botan::TLS::TLS_CBC_HMAC_AEAD_Mode::tag_size(), and Botan::TLS::TLS_CBC_HMAC_AEAD_Mode::use_encrypt_then_mac().

163  {
164  return round_up(input_length + 1 + (use_encrypt_then_mac() ? 0 : tag_size()), block_size()) +
165  (use_encrypt_then_mac() ? tag_size() : 0);
166  }
size_t tag_size() const overridefinal
Definition: tls_cbc.h:39
bool use_encrypt_then_mac() const
Definition: tls_cbc.h:60
size_t round_up(size_t n, size_t align_to)
Definition: rounding.h:22
size_t Botan::TLS::TLS_CBC_HMAC_AEAD_Mode::process ( uint8_t  msg[],
size_t  msg_len 
)
finaloverridevirtualinherited

Process message blocks

Input must be a multiple of update_granularity

Processes msg in place and returns bytes written. Normally this will be either msg_len (indicating the entire message was processed) or for certain AEAD modes zero (indicating that the mode requires the entire message be processed in one pass).

Parameters
msgthe message to be processed
msg_lenlength of the message in bytes

Implements Botan::Cipher_Mode.

Definition at line 108 of file tls_cbc.cpp.

109  {
110  m_msg.insert(m_msg.end(), buf, buf + sz);
111  return 0;
112  }
virtual std::string Botan::Cipher_Mode::provider ( ) const
inlinevirtualinherited
Returns
provider information about this implementation. Default is "base", might also return "sse2", "avx2", "openssl", or some other arbitrary string.

Reimplemented in Botan::GCM_Mode.

Definition at line 202 of file cipher_mode.h.

202 { return "base"; }
void Botan::TLS::TLS_CBC_HMAC_AEAD_Mode::reset ( )
finaloverridevirtualinherited

Resets just the message specific state and allows encrypting again under the existing key

Implements Botan::Cipher_Mode.

Definition at line 53 of file tls_cbc.cpp.

References Botan::TLS::TLS_CBC_HMAC_AEAD_Mode::cbc_state().

Referenced by Botan::TLS::TLS_CBC_HMAC_AEAD_Mode::clear().

54  {
55  cbc_state().clear();
56  m_ad.clear();
57  m_msg.clear();
58  }
secure_vector< uint8_t > & cbc_state()
Definition: tls_cbc.h:74
template<typename Alloc >
void Botan::AEAD_Mode::set_ad ( const std::vector< uint8_t, Alloc > &  ad)
inlineinherited

Set associated data that is not included in the ciphertext but that should be authenticated. Must be called after set_key and before start.

See set_associated_data().

Parameters
adthe associated data

Definition at line 66 of file aead.h.

Referenced by Botan::TLS::write_record().

67  {
68  set_associated_data(ad.data(), ad.size());
69  }
virtual void set_associated_data(const uint8_t ad[], size_t ad_len)=0
void Botan::TLS::TLS_CBC_HMAC_AEAD_Encryption::set_associated_data ( const uint8_t  ad[],
size_t  ad_len 
)
overridevirtual

Set associated data that is not included in the ciphertext but that should be authenticated. Must be called after set_key and before start.

Unless reset by another call, the associated data is kept between messages. Thus, if the AD does not change, calling once (after set_key) is the optimum.

Parameters
adthe associated data
ad_lenlength of add in bytes

Reimplemented from Botan::TLS::TLS_CBC_HMAC_AEAD_Mode.

Definition at line 130 of file tls_cbc.cpp.

References Botan::TLS::TLS_CBC_HMAC_AEAD_Mode::assoc_data(), Botan::TLS::TLS_CBC_HMAC_AEAD_Mode::block_size(), Botan::TLS::TLS_CBC_HMAC_AEAD_Mode::iv_size(), Botan::make_uint16(), Botan::round_up(), Botan::TLS::TLS_CBC_HMAC_AEAD_Mode::set_associated_data(), and Botan::TLS::TLS_CBC_HMAC_AEAD_Mode::use_encrypt_then_mac().

131  {
133 
135  {
136  // AAD hack for EtM
137  size_t pt_size = make_uint16(assoc_data()[11], assoc_data()[12]);
138  size_t enc_size = round_up(iv_size() + pt_size + 1, block_size());
139  assoc_data()[11] = get_byte<uint16_t>(0, enc_size);
140  assoc_data()[12] = get_byte<uint16_t>(1, enc_size);
141  }
142  }
void set_associated_data(const uint8_t ad[], size_t ad_len) override
Definition: tls_cbc.cpp:123
std::vector< uint8_t > & assoc_data()
Definition: tls_cbc.h:75
bool use_encrypt_then_mac() const
Definition: tls_cbc.h:60
uint16_t make_uint16(uint8_t i0, uint8_t i1)
Definition: loadstor.h:60
size_t round_up(size_t n, size_t align_to)
Definition: rounding.h:22
template<typename Alloc >
void Botan::AEAD_Mode::set_associated_data_vec ( const std::vector< uint8_t, Alloc > &  ad)
inlineinherited

Set associated data that is not included in the ciphertext but that should be authenticated. Must be called after set_key and before start.

See set_associated_data().

Parameters
adthe associated data

Definition at line 51 of file aead.h.

52  {
53  set_associated_data(ad.data(), ad.size());
54  }
virtual void set_associated_data(const uint8_t ad[], size_t ad_len)=0
template<typename Alloc >
void Botan::Cipher_Mode::set_key ( const std::vector< uint8_t, Alloc > &  key)
inlineinherited

Set the symmetric key of this transform

Parameters
keycontains the key material

Definition at line 172 of file cipher_mode.h.

Referenced by botan_cipher_set_key().

173  {
174  set_key(key.data(), key.size());
175  }
void set_key(const std::vector< uint8_t, Alloc > &key)
Definition: cipher_mode.h:172
void Botan::Cipher_Mode::set_key ( const SymmetricKey key)
inlineinherited

Set the symmetric key of this transform

Parameters
keycontains the key material

Definition at line 181 of file cipher_mode.h.

References Botan::OctetString::begin(), and Botan::OctetString::length().

182  {
183  set_key(key.begin(), key.length());
184  }
void set_key(const std::vector< uint8_t, Alloc > &key)
Definition: cipher_mode.h:172
void Botan::Cipher_Mode::set_key ( const uint8_t  key[],
size_t  length 
)
inlineinherited

Set the symmetric key of this transform

Parameters
keycontains the key material
lengthin bytes of key param

Definition at line 191 of file cipher_mode.h.

192  {
193  if(!valid_keylength(length))
194  throw Invalid_Key_Length(name(), length);
195  key_schedule(key, length);
196  }
virtual std::string name() const =0
bool valid_keylength(size_t length) const
Definition: cipher_mode.h:162
template<typename Alloc >
void Botan::Cipher_Mode::start ( const std::vector< uint8_t, Alloc > &  nonce)
inlineinherited

Begin processing a message.

Parameters
noncethe per message nonce

Definition at line 38 of file cipher_mode.h.

Referenced by botan_cipher_start(), and Botan::TLS::write_record().

39  {
40  start_msg(nonce.data(), nonce.size());
41  }
virtual void start_msg(const uint8_t nonce[], size_t nonce_len)=0
void Botan::Cipher_Mode::start ( const uint8_t  nonce[],
size_t  nonce_len 
)
inlineinherited

Begin processing a message.

Parameters
noncethe per message nonce
nonce_lenlength of nonce

Definition at line 48 of file cipher_mode.h.

49  {
50  start_msg(nonce, nonce_len);
51  }
virtual void start_msg(const uint8_t nonce[], size_t nonce_len)=0
void Botan::Cipher_Mode::start ( )
inlineinherited

Begin processing a message.

Definition at line 56 of file cipher_mode.h.

57  {
58  return start_msg(nullptr, 0);
59  }
virtual void start_msg(const uint8_t nonce[], size_t nonce_len)=0
size_t Botan::TLS::TLS_CBC_HMAC_AEAD_Mode::tag_size ( ) const
inlinefinaloverridevirtualinherited
Returns
the size of the authentication tag used (in bytes)

Reimplemented from Botan::Cipher_Mode.

Definition at line 39 of file tls_cbc.h.

Referenced by finish(), Botan::TLS::TLS_CBC_HMAC_AEAD_Decryption::finish(), and output_length().

39 { return m_tag_size; }
void Botan::Cipher_Mode::update ( secure_vector< uint8_t > &  buffer,
size_t  offset = 0 
)
inlineinherited

Process some data. Input must be in size update_granularity() uint8_t blocks.

Parameters
bufferin/out parameter which will possibly be resized
offsetan offset into blocks to begin processing

Definition at line 81 of file cipher_mode.h.

References BOTAN_ASSERT.

Referenced by botan_cipher_update(), Botan::XTS_Encryption::finish(), Botan::ChaCha20Poly1305_Encryption::finish(), Botan::CBC_Encryption::finish(), Botan::CFB_Encryption::finish(), Botan::EAX_Encryption::finish(), Botan::XTS_Decryption::finish(), Botan::CFB_Decryption::finish(), Botan::CTS_Encryption::finish(), Botan::CBC_Decryption::finish(), finish(), Botan::CTS_Decryption::finish(), and Botan::TLS::TLS_CBC_HMAC_AEAD_Decryption::finish().

82  {
83  BOTAN_ASSERT(buffer.size() >= offset, "Offset ok");
84  uint8_t* buf = buffer.data() + offset;
85  const size_t buf_size = buffer.size() - offset;
86 
87  const size_t written = process(buf, buf_size);
88  buffer.resize(offset + written);
89  }
#define BOTAN_ASSERT(expr, assertion_made)
Definition: assert.h:27
virtual size_t process(uint8_t msg[], size_t msg_len)=0
size_t Botan::TLS::TLS_CBC_HMAC_AEAD_Mode::update_granularity ( ) const
finaloverridevirtualinherited
Returns
size of required blocks to update

Implements Botan::Cipher_Mode.

Definition at line 65 of file tls_cbc.cpp.

66  {
67  return 1; // just buffers anyway
68  }
bool Botan::TLS::TLS_CBC_HMAC_AEAD_Mode::use_encrypt_then_mac ( ) const
inlineprotectedinherited

Definition at line 60 of file tls_cbc.h.

Referenced by finish(), Botan::TLS::TLS_CBC_HMAC_AEAD_Decryption::finish(), output_length(), and set_associated_data().

60 { return m_use_encrypt_then_mac; }
bool Botan::Cipher_Mode::valid_keylength ( size_t  length) const
inlineinherited

Check whether a given key length is valid for this algorithm.

Parameters
lengththe key length to be checked.
Returns
true if the key length is valid.

Definition at line 162 of file cipher_mode.h.

163  {
164  return key_spec().valid_keylength(length);
165  }
bool valid_keylength(size_t length) const
Definition: key_spec.h:51
virtual Key_Length_Specification key_spec() const =0
bool Botan::TLS::TLS_CBC_HMAC_AEAD_Mode::valid_nonce_length ( size_t  nonce_len) const
finaloverridevirtualinherited
Returns
true iff nonce_len is a valid length for the nonce

Implements Botan::Cipher_Mode.

Definition at line 70 of file tls_cbc.cpp.

References Botan::TLS::TLS_CBC_HMAC_AEAD_Mode::block_size(), and Botan::TLS::TLS_CBC_HMAC_AEAD_Mode::iv_size().

71  {
72  if(m_cbc_state.empty())
73  return nl == block_size();
74  return nl == iv_size();
75  }

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