Botan 3.0.0-alpha0
Crypto and TLS for C&
Public Member Functions | Static Public Member Functions | Protected Member Functions | Protected Attributes | List of all members
Botan::CFB_Encryption Class Referencefinal

#include <cfb.h>

Inheritance diagram for Botan::CFB_Encryption:
Botan::CFB_Mode Botan::Cipher_Mode Botan::SymmetricAlgorithm

Public Member Functions

bool authenticated () const
 
 CFB_Encryption (std::unique_ptr< BlockCipher > cipher, size_t feedback_bits)
 
void clear () override final
 
size_t default_nonce_length () const override final
 
void finish (secure_vector< uint8_t > &final_block, size_t offset=0) override
 
Key_Length_Specification key_spec () const override final
 
size_t maximum_keylength () const
 
size_t minimum_final_size () const override final
 
size_t minimum_keylength () const
 
std::string name () const override final
 
size_t output_length (size_t input_length) const override final
 
size_t process (uint8_t buf[], size_t size) override
 
virtual std::string provider () const
 
void reset () override final
 
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)
 
void start ()
 
template<typename Alloc >
void start (const std::vector< uint8_t, Alloc > &nonce)
 
void start (const uint8_t nonce[], size_t nonce_len)
 
virtual size_t tag_size () const
 
void update (secure_vector< uint8_t > &buffer, size_t offset=0)
 
size_t update_granularity () const override final
 
bool valid_keylength (size_t length) const
 
bool valid_nonce_length (size_t n) const override final
 

Static Public Member Functions

static std::unique_ptr< Cipher_Modecreate (const std::string &algo, Cipher_Dir direction, const std::string &provider="")
 
static std::unique_ptr< Cipher_Modecreate_or_throw (const std::string &algo, Cipher_Dir direction, const std::string &provider="")
 
static std::vector< std::string > providers (const std::string &algo_spec)
 

Protected Member Functions

size_t block_size () const
 
const BlockCiphercipher () const
 
size_t feedback () const
 
void shift_register ()
 
void verify_key_set (bool cond) const
 

Protected Attributes

secure_vector< uint8_t > m_keystream
 
size_t m_keystream_pos = 0
 
secure_vector< uint8_t > m_state
 

Detailed Description

CFB Encryption

Definition at line 65 of file cfb.h.

Constructor & Destructor Documentation

◆ CFB_Encryption()

Botan::CFB_Encryption::CFB_Encryption ( std::unique_ptr< BlockCipher cipher,
size_t  feedback_bits 
)
inline

If feedback_bits is zero, cipher->block_size() bytes will be used.

Parameters
cipherblock cipher to use
feedback_bitsnumber of bits fed back into the shift register, must be a multiple of 8

Definition at line 74 of file cfb.h.

74 :
75 CFB_Mode(std::move(cipher), feedback_bits) {}
CFB_Mode(std::unique_ptr< BlockCipher > cipher, size_t feedback_bits)
Definition: cfb.cpp:13
const BlockCipher & cipher() const
Definition: cfb.h:46

Member Function Documentation

◆ authenticated()

bool Botan::Cipher_Mode::authenticated ( ) const
inlineinherited
Returns
true iff this mode provides authentication as well as confidentiality.

Definition at line 169 of file cipher_mode.h.

169{ return this->tag_size() > 0; }
virtual size_t tag_size() const
Definition: cipher_mode.h:174

◆ block_size()

size_t Botan::CFB_Mode::block_size ( ) const
inlineprotectedinherited

◆ cipher()

const BlockCipher & Botan::CFB_Mode::cipher ( ) const
inlineprotectedinherited

Definition at line 46 of file cfb.h.

46{ return *m_cipher; }

Referenced by Botan::CFB_Mode::key_spec(), Botan::CFB_Mode::name(), and Botan::CFB_Mode::shift_register().

◆ clear()

void Botan::CFB_Mode::clear ( )
finaloverridevirtualinherited

Reset the state.

Implements Botan::SymmetricAlgorithm.

Definition at line 23 of file cfb.cpp.

24 {
25 m_cipher->clear();
26 m_keystream.clear();
27 reset();
28 }
secure_vector< uint8_t > m_keystream
Definition: cfb.h:50
void reset() override final
Definition: cfb.cpp:30

References Botan::CFB_Mode::m_keystream, and Botan::CFB_Mode::reset().

◆ create()

std::unique_ptr< Cipher_Mode > Botan::Cipher_Mode::create ( const std::string &  algo,
Cipher_Dir  direction,
const std::string &  provider = "" 
)
staticinherited

Create an AEAD mode

Parameters
algothe algorithm to create
directionspecify if this should be an encryption or decryption AEAD
provideroptional specification for provider to use
Returns
an AEAD mode or a null pointer if not available

Definition at line 50 of file cipher_mode.cpp.

53 {
54#if defined(BOTAN_HAS_COMMONCRYPTO)
55 if(provider.empty() || provider == "commoncrypto")
56 {
57 std::unique_ptr<Cipher_Mode> commoncrypto_cipher(make_commoncrypto_cipher_mode(algo, direction));
58
59 if(commoncrypto_cipher)
60 return commoncrypto_cipher;
61
62 if(!provider.empty())
63 return std::unique_ptr<Cipher_Mode>();
64 }
65#endif
66
67#if defined(BOTAN_HAS_STREAM_CIPHER)
68 if(auto sc = StreamCipher::create(algo))
69 {
70 return std::make_unique<Stream_Cipher_Mode>(std::move(sc));
71 }
72#endif
73
74#if defined(BOTAN_HAS_AEAD_MODES)
75 if(auto aead = AEAD_Mode::create(algo, direction))
76 {
77 return aead;
78 }
79#endif
80
81 if(algo.find('/') != std::string::npos)
82 {
83 const std::vector<std::string> algo_parts = split_on(algo, '/');
84 const std::string cipher_name = algo_parts[0];
85 const std::vector<std::string> mode_info = parse_algorithm_name(algo_parts[1]);
86
87 if(mode_info.empty())
88 return std::unique_ptr<Cipher_Mode>();
89
90 std::ostringstream mode_name;
91
92 mode_name << mode_info[0] << '(' << cipher_name;
93 for(size_t i = 1; i < mode_info.size(); ++i)
94 mode_name << ',' << mode_info[i];
95 for(size_t i = 2; i < algo_parts.size(); ++i)
96 mode_name << ',' << algo_parts[i];
97 mode_name << ')';
98
99 return Cipher_Mode::create(mode_name.str(), direction, provider);
100 }
101
102#if defined(BOTAN_HAS_BLOCK_CIPHER)
103
104 SCAN_Name spec(algo);
105
106 if(spec.arg_count() == 0)
107 {
108 return std::unique_ptr<Cipher_Mode>();
109 }
110
111 std::unique_ptr<BlockCipher> bc(BlockCipher::create(spec.arg(0), provider));
112
113 if(!bc)
114 {
115 return std::unique_ptr<Cipher_Mode>();
116 }
117
118#if defined(BOTAN_HAS_MODE_CBC)
119 if(spec.algo_name() == "CBC")
120 {
121 const std::string padding = spec.arg(1, "PKCS7");
122
123 if(padding == "CTS")
124 {
125 if(direction == ENCRYPTION)
126 return std::make_unique<CTS_Encryption>(std::move(bc));
127 else
128 return std::make_unique<CTS_Decryption>(std::move(bc));
129 }
130 else
131 {
132 auto pad = BlockCipherModePaddingMethod::create(padding);
133
134 if(pad)
135 {
136 if(direction == ENCRYPTION)
137 return std::make_unique<CBC_Encryption>(std::move(bc), std::move(pad));
138 else
139 return std::make_unique<CBC_Decryption>(std::move(bc), std::move(pad));
140 }
141 }
142 }
143#endif
144
145#if defined(BOTAN_HAS_MODE_XTS)
146 if(spec.algo_name() == "XTS")
147 {
148 if(direction == ENCRYPTION)
149 return std::make_unique<XTS_Encryption>(std::move(bc));
150 else
151 return std::make_unique<XTS_Decryption>(std::move(bc));
152 }
153#endif
154
155#if defined(BOTAN_HAS_MODE_CFB)
156 if(spec.algo_name() == "CFB")
157 {
158 const size_t feedback_bits = spec.arg_as_integer(1, 8*bc->block_size());
159 if(direction == ENCRYPTION)
160 return std::make_unique<CFB_Encryption>(std::move(bc), feedback_bits);
161 else
162 return std::make_unique<CFB_Decryption>(std::move(bc), feedback_bits);
163 }
164#endif
165
166#endif
167
168 return std::unique_ptr<Cipher_Mode>();
169 }
static std::unique_ptr< AEAD_Mode > create(const std::string &algo, Cipher_Dir direction, const std::string &provider="")
Definition: aead.cpp:60
static std::unique_ptr< BlockCipherModePaddingMethod > create(const std::string &algo_spec)
Definition: mode_pad.cpp:19
static std::unique_ptr< BlockCipher > create(const std::string &algo_spec, const std::string &provider="")
virtual std::string provider() const
Definition: cipher_mode.h:180
static std::unique_ptr< Cipher_Mode > create(const std::string &algo, Cipher_Dir direction, const std::string &provider="")
Definition: cipher_mode.cpp:50
static std::unique_ptr< StreamCipher > create(const std::string &algo_spec, const std::string &provider="")
std::unique_ptr< Cipher_Mode > make_commoncrypto_cipher_mode(const std::string &name, Cipher_Dir direction)
@ ENCRYPTION
Definition: cipher_mode.h:23
std::vector< std::string > split_on(const std::string &str, char delim)
Definition: parsing.cpp:111
std::vector< std::string > parse_algorithm_name(const std::string &namex)
Definition: parsing.cpp:58

References Botan::SCAN_Name::algo_name(), Botan::SCAN_Name::arg(), Botan::SCAN_Name::arg_as_integer(), Botan::SCAN_Name::arg_count(), Botan::AEAD_Mode::create(), Botan::Cipher_Mode::create(), Botan::BlockCipherModePaddingMethod::create(), Botan::BlockCipher::create(), Botan::StreamCipher::create(), Botan::ENCRYPTION, Botan::make_commoncrypto_cipher_mode(), Botan::parse_algorithm_name(), Botan::Cipher_Mode::provider(), and Botan::split_on().

Referenced by botan_cipher_init(), Botan::Cipher_Mode::create(), Botan::Cipher_Mode::create_or_throw(), Botan::get_cipher_mode(), Botan::pbes2_decrypt(), and Botan::Cipher_Mode::providers().

◆ create_or_throw()

std::unique_ptr< Cipher_Mode > Botan::Cipher_Mode::create_or_throw ( const std::string &  algo,
Cipher_Dir  direction,
const std::string &  provider = "" 
)
staticinherited

Create an AEAD mode, or throw

Parameters
algothe algorithm to create
directionspecify if this should be an encryption or decryption AEAD
provideroptional specification for provider to use
Returns
an AEAD mode, or throw an exception

Definition at line 40 of file cipher_mode.cpp.

43 {
44 if(auto mode = Cipher_Mode::create(algo, direction, provider))
45 return mode;
46
47 throw Lookup_Error("Cipher mode", algo, provider);
48 }

References Botan::Cipher_Mode::create(), and Botan::Cipher_Mode::provider().

Referenced by Botan::ECIES_System_Params::create_cipher(), Botan::CryptoBox::decrypt_bin(), Botan::CryptoBox::encrypt(), and Botan::get_cipher().

◆ default_nonce_length()

size_t Botan::CFB_Mode::default_nonce_length ( ) const
finaloverridevirtualinherited
Returns
the default size for a nonce

Implements Botan::Cipher_Mode.

Definition at line 64 of file cfb.cpp.

65 {
66 return block_size();
67 }
size_t block_size() const
Definition: cfb.h:47

References Botan::CFB_Mode::block_size().

◆ feedback()

size_t Botan::CFB_Mode::feedback ( ) const
inlineprotectedinherited

◆ finish()

void Botan::CFB_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 163 of file cfb.cpp.

164 {
165 update(buffer, offset);
166 }
void update(secure_vector< uint8_t > &buffer, size_t offset=0)
Definition: cipher_mode.h:112

References Botan::Cipher_Mode::update().

◆ key_spec()

Key_Length_Specification Botan::CFB_Mode::key_spec ( ) const
finaloverridevirtualinherited
Returns
object describing limits on key size

Implements Botan::SymmetricAlgorithm.

Definition at line 59 of file cfb.cpp.

60 {
61 return cipher().key_spec();
62 }
virtual Key_Length_Specification key_spec() const =0

References Botan::CFB_Mode::cipher(), and Botan::SymmetricAlgorithm::key_spec().

◆ maximum_keylength()

size_t Botan::SymmetricAlgorithm::maximum_keylength ( ) const
inlineinherited
Returns
maximum allowed key length

Definition at line 120 of file sym_algo.h.

121 {
122 return key_spec().maximum_keylength();
123 }
size_t maximum_keylength() const
Definition: sym_algo.h:70

◆ minimum_final_size()

size_t Botan::CFB_Mode::minimum_final_size ( ) const
finaloverridevirtualinherited
Returns
required minimium size to finalize() - may be any length larger than this.

Implements Botan::Cipher_Mode.

Definition at line 54 of file cfb.cpp.

55 {
56 return 0;
57 }

◆ minimum_keylength()

size_t Botan::SymmetricAlgorithm::minimum_keylength ( ) const
inlineinherited
Returns
minimum allowed key length

Definition at line 128 of file sym_algo.h.

129 {
130 return key_spec().minimum_keylength();
131 }
size_t minimum_keylength() const
Definition: sym_algo.h:62

Referenced by botan_block_cipher_get_keyspec(), and botan_mac_get_keyspec().

◆ name()

std::string Botan::CFB_Mode::name ( ) const
finaloverridevirtualinherited
Returns
the algorithm name

Implements Botan::SymmetricAlgorithm.

Definition at line 36 of file cfb.cpp.

37 {
38 if(feedback() == cipher().block_size())
39 return cipher().name() + "/CFB";
40 else
41 return cipher().name() + "/CFB(" + std::to_string(feedback()*8) + ")";
42 }
size_t feedback() const
Definition: cfb.h:45
virtual std::string name() const =0
std::string to_string(const BER_Object &obj)
Definition: asn1_obj.cpp:209

References Botan::CFB_Mode::block_size(), Botan::CFB_Mode::cipher(), Botan::CFB_Mode::feedback(), Botan::SymmetricAlgorithm::name(), and Botan::ASN1::to_string().

◆ output_length()

size_t Botan::CFB_Mode::output_length ( size_t  input_length) const
finaloverridevirtualinherited

Returns the size of the output if this transform is used to process a message with input_length bytes. In most cases the answer is precise. If it is not possible to precise (namely for CBC decryption) instead a lower bound is returned.

Implements Botan::Cipher_Mode.

Definition at line 44 of file cfb.cpp.

45 {
46 return input_length;
47 }

◆ process()

size_t Botan::CFB_Encryption::process ( uint8_t  msg[],
size_t  msg_len 
)
overridevirtual

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 117 of file cfb.cpp.

118 {
119 verify_key_set(!m_keystream.empty());
120 BOTAN_STATE_CHECK(m_state.empty() == false);
121
122 const size_t shift = feedback();
123
124 size_t left = sz;
125
126 if(m_keystream_pos != 0)
127 {
128 const size_t take = std::min<size_t>(left, shift - m_keystream_pos);
129
130 xor_buf(m_keystream.data() + m_keystream_pos, buf, take);
131 copy_mem(buf, m_keystream.data() + m_keystream_pos, take);
132
133 m_keystream_pos += take;
134 left -= take;
135 buf += take;
136
137 if(m_keystream_pos == shift)
138 {
140 }
141 }
142
143 while(left >= shift)
144 {
145 xor_buf(m_keystream.data(), buf, shift);
146 copy_mem(buf, m_keystream.data(), shift);
147
148 left -= shift;
149 buf += shift;
151 }
152
153 if(left > 0)
154 {
155 xor_buf(m_keystream.data(), buf, left);
156 copy_mem(buf, m_keystream.data(), left);
157 m_keystream_pos += left;
158 }
159
160 return sz;
161 }
#define BOTAN_STATE_CHECK(expr)
Definition: assert.h:48
void shift_register()
Definition: cfb.cpp:103
secure_vector< uint8_t > m_state
Definition: cfb.h:49
size_t m_keystream_pos
Definition: cfb.h:51
void verify_key_set(bool cond) const
Definition: sym_algo.h:171
constexpr void copy_mem(T *out, const T *in, size_t n)
Definition: mem_ops.h:126
void xor_buf(uint8_t out[], const uint8_t in[], size_t length)
Definition: mem_ops.h:255

References BOTAN_STATE_CHECK, Botan::copy_mem(), Botan::CFB_Mode::feedback(), Botan::CFB_Mode::m_keystream, Botan::CFB_Mode::m_keystream_pos, Botan::CFB_Mode::m_state, Botan::CFB_Mode::shift_register(), Botan::SymmetricAlgorithm::verify_key_set(), and Botan::xor_buf().

◆ provider()

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 180 of file cipher_mode.h.

180{ return "base"; }

Referenced by Botan::AEAD_Mode::create(), Botan::Cipher_Mode::create(), Botan::AEAD_Mode::create_or_throw(), and Botan::Cipher_Mode::create_or_throw().

◆ providers()

std::vector< std::string > Botan::Cipher_Mode::providers ( const std::string &  algo_spec)
staticinherited
Returns
list of available providers for this algorithm, empty if not available
Parameters
algo_specalgorithm name

Definition at line 172 of file cipher_mode.cpp.

173 {
174 const std::vector<std::string>& possible = { "base", "commoncrypto" };
175 std::vector<std::string> providers;
176 for(auto&& prov : possible)
177 {
178 std::unique_ptr<Cipher_Mode> mode = Cipher_Mode::create(algo_spec, ENCRYPTION, prov);
179 if(mode)
180 {
181 providers.push_back(prov); // available
182 }
183 }
184 return providers;
185 }
static std::vector< std::string > providers(const std::string &algo_spec)

References Botan::Cipher_Mode::create(), Botan::ENCRYPTION, and Botan::Cipher_Mode::providers().

Referenced by Botan::Cipher_Mode::providers().

◆ reset()

void Botan::CFB_Mode::reset ( )
finaloverridevirtualinherited

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

Implements Botan::Cipher_Mode.

Definition at line 30 of file cfb.cpp.

31 {
32 m_state.clear();
34 }
void zeroise(std::vector< T, Alloc > &vec)
Definition: secmem.h:114

References Botan::CFB_Mode::m_keystream, Botan::CFB_Mode::m_state, and Botan::zeroise().

Referenced by Botan::CFB_Mode::clear().

◆ set_key() [1/3]

template<typename Alloc >
void Botan::SymmetricAlgorithm::set_key ( const std::vector< uint8_t, Alloc > &  key)
inlineinherited

Definition at line 153 of file sym_algo.h.

154 {
155 set_key(key.data(), key.size());
156 }
void set_key(const SymmetricKey &key)
Definition: sym_algo.h:147

◆ set_key() [2/3]

void Botan::SymmetricAlgorithm::set_key ( const SymmetricKey key)
inlineinherited

◆ set_key() [3/3]

void Botan::SymmetricAlgorithm::set_key ( const uint8_t  key[],
size_t  length 
)
inherited

Set the symmetric key of this object.

Parameters
keythe to be set as a byte array.
lengthin bytes of key param

Definition at line 17 of file sym_algo.cpp.

18 {
19 if(!valid_keylength(length))
20 throw Invalid_Key_Length(name(), length);
21 key_schedule(key, length);
22 }
bool valid_keylength(size_t length) const
Definition: sym_algo.h:138

References Botan::SymmetricAlgorithm::name(), and Botan::SymmetricAlgorithm::valid_keylength().

◆ shift_register()

void Botan::CFB_Mode::shift_register ( )
protectedinherited

Definition at line 103 of file cfb.cpp.

104 {
105 const size_t shift = feedback();
106 const size_t carryover = block_size() - shift;
107
108 if(carryover > 0)
109 {
110 copy_mem(m_state.data(), &m_state[shift], carryover);
111 }
112 copy_mem(&m_state[carryover], m_keystream.data(), shift);
114 m_keystream_pos = 0;
115 }
void encrypt(const uint8_t in[], uint8_t out[]) const
Definition: block_cipher.h:82

References Botan::CFB_Mode::block_size(), Botan::CFB_Mode::cipher(), Botan::copy_mem(), Botan::BlockCipher::encrypt(), Botan::CFB_Mode::feedback(), Botan::CFB_Mode::m_keystream, Botan::CFB_Mode::m_keystream_pos, and Botan::CFB_Mode::m_state.

Referenced by process(), and Botan::CFB_Decryption::process().

◆ start() [1/3]

void Botan::Cipher_Mode::start ( )
inlineinherited

Begin processing a message.

Definition at line 87 of file cipher_mode.h.

88 {
89 return start_msg(nullptr, 0);
90 }
virtual void start_msg(const uint8_t nonce[], size_t nonce_len)=0

◆ start() [2/3]

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 69 of file cipher_mode.h.

70 {
71 start_msg(nonce.data(), nonce.size());
72 }

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

◆ start() [3/3]

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 79 of file cipher_mode.h.

80 {
81 start_msg(nonce, nonce_len);
82 }

◆ tag_size()

virtual size_t Botan::Cipher_Mode::tag_size ( ) const
inlinevirtualinherited
Returns
the size of the authentication tag used (in bytes)

Reimplemented in Botan::CCM_Mode, Botan::ChaCha20Poly1305_Mode, Botan::EAX_Mode, Botan::OCB_Mode, Botan::SIV_Mode, Botan::GCM_Mode, and Botan::TLS::TLS_CBC_HMAC_AEAD_Mode.

Definition at line 174 of file cipher_mode.h.

174{ return 0; }

Referenced by botan_cipher_get_tag_length().

◆ update()

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 112 of file cipher_mode.h.

113 {
114 BOTAN_ASSERT(buffer.size() >= offset, "Offset ok");
115 uint8_t* buf = buffer.data() + offset;
116 const size_t buf_size = buffer.size() - offset;
117
118 const size_t written = process(buf, buf_size);
119 buffer.resize(offset + written);
120 }
#define BOTAN_ASSERT(expr, assertion_made)
Definition: assert.h:54
virtual size_t process(uint8_t msg[], size_t msg_len)=0

References BOTAN_ASSERT.

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

◆ update_granularity()

size_t Botan::CFB_Mode::update_granularity ( ) const
finaloverridevirtualinherited
Returns
size of required blocks to update

Implements Botan::Cipher_Mode.

Definition at line 49 of file cfb.cpp.

50 {
51 return feedback();
52 }

References Botan::CFB_Mode::feedback().

◆ valid_keylength()

bool Botan::SymmetricAlgorithm::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 138 of file sym_algo.h.

139 {
140 return key_spec().valid_keylength(length);
141 }
bool valid_keylength(size_t length) const
Definition: sym_algo.h:52

Referenced by Botan::SymmetricAlgorithm::set_key().

◆ valid_nonce_length()

bool Botan::CFB_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 69 of file cfb.cpp.

70 {
71 return (n == 0 || n == block_size());
72 }

References Botan::CFB_Mode::block_size().

◆ verify_key_set()

void Botan::SymmetricAlgorithm::verify_key_set ( bool  cond) const
inlineprotectedinherited

Definition at line 171 of file sym_algo.h.

172 {
173 if(cond == false)
174 throw_key_not_set_error();
175 }

Referenced by Botan::ChaCha::cipher(), Botan::CTR_BE::cipher(), Botan::RC4::cipher(), Botan::Salsa20::cipher(), Botan::SHAKE_128_Cipher::cipher(), Botan::AES_128::decrypt_n(), Botan::AES_192::decrypt_n(), Botan::AES_256::decrypt_n(), Botan::ARIA_128::decrypt_n(), Botan::ARIA_192::decrypt_n(), Botan::ARIA_256::decrypt_n(), Botan::Blowfish::decrypt_n(), Botan::Camellia_128::decrypt_n(), Botan::Camellia_192::decrypt_n(), Botan::Camellia_256::decrypt_n(), Botan::CAST_128::decrypt_n(), Botan::DES::decrypt_n(), Botan::TripleDES::decrypt_n(), Botan::GOST_28147_89::decrypt_n(), Botan::IDEA::decrypt_n(), Botan::Lion::decrypt_n(), Botan::Noekeon::decrypt_n(), Botan::SEED::decrypt_n(), Botan::Serpent::decrypt_n(), Botan::SHACAL2::decrypt_n(), Botan::SM4::decrypt_n(), Botan::Threefish_512::decrypt_n(), Botan::Twofish::decrypt_n(), Botan::AES_128::encrypt_n(), Botan::AES_192::encrypt_n(), Botan::AES_256::encrypt_n(), Botan::ARIA_128::encrypt_n(), Botan::ARIA_192::encrypt_n(), Botan::ARIA_256::encrypt_n(), Botan::Blowfish::encrypt_n(), Botan::Camellia_128::encrypt_n(), Botan::Camellia_192::encrypt_n(), Botan::Camellia_256::encrypt_n(), Botan::CAST_128::encrypt_n(), Botan::DES::encrypt_n(), Botan::TripleDES::encrypt_n(), Botan::GOST_28147_89::encrypt_n(), Botan::IDEA::encrypt_n(), Botan::Lion::encrypt_n(), Botan::Noekeon::encrypt_n(), Botan::SEED::encrypt_n(), Botan::Serpent::encrypt_n(), Botan::SHACAL2::encrypt_n(), Botan::SM4::encrypt_n(), Botan::Threefish_512::encrypt_n(), Botan::Twofish::encrypt_n(), Botan::OCB_Encryption::finish(), Botan::OCB_Decryption::finish(), Botan::GHASH::ghash_update(), process(), Botan::CFB_Decryption::process(), Botan::ChaCha::seek(), Botan::CTR_BE::seek(), Botan::Salsa20::seek(), Botan::OCB_Mode::set_associated_data(), Botan::ChaCha::set_iv(), Botan::Salsa20::set_iv(), Botan::GHASH::update(), Botan::GHASH::update_associated_data(), and Botan::ChaCha::write_keystream().

Member Data Documentation

◆ m_keystream

secure_vector<uint8_t> Botan::CFB_Mode::m_keystream
protectedinherited

◆ m_keystream_pos

size_t Botan::CFB_Mode::m_keystream_pos = 0
protectedinherited

Definition at line 51 of file cfb.h.

Referenced by process(), Botan::CFB_Decryption::process(), and Botan::CFB_Mode::shift_register().

◆ m_state

secure_vector<uint8_t> Botan::CFB_Mode::m_state
protectedinherited

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