Botan::CMAC Class Reference

#include <cmac.h>

Inheritance diagram for Botan::CMAC:

Public Member Functions
void	clear () override
MessageAuthenticationCode *	clone () const
	CMAC (std::unique_ptr< BlockCipher > cipher)
template<concepts::resizable_byte_buffer T = secure_vector<uint8_t>>
T	final ()
void	final (std::span< uint8_t > out)
template<concepts::resizable_byte_buffer T>
void	final (T &out)
void	final (uint8_t out[])
std::vector< uint8_t >	final_stdvec ()
virtual bool	fresh_key_required_per_message () const
bool	has_keying_material () const override
Key_Length_Specification	key_spec () const override
size_t	maximum_keylength () const
size_t	minimum_keylength () const
std::string	name () const override
std::unique_ptr< MessageAuthenticationCode >	new_object () const override
size_t	output_length () const override
template<concepts::resizable_byte_buffer T = secure_vector<uint8_t>>
T	process (const uint8_t in[], size_t length)
template<concepts::resizable_byte_buffer T = secure_vector<uint8_t>>
T	process (std::span< const uint8_t > in)
template<concepts::resizable_byte_buffer T = secure_vector<uint8_t>>
T	process (std::string_view in)
virtual std::string	provider () const
void	set_key (const OctetString &key)
void	set_key (const uint8_t key[], size_t length)
void	set_key (std::span< const uint8_t > key)
void	start ()
void	start (const uint8_t nonce[], size_t nonce_len)
void	start (std::span< const uint8_t > nonce)
void	update (const uint8_t in[], size_t length)
void	update (std::span< const uint8_t > in)
void	update (std::string_view str)
void	update (uint8_t in)
void	update_be (uint16_t val)
void	update_be (uint32_t val)
void	update_be (uint64_t val)
void	update_le (uint16_t val)
void	update_le (uint32_t val)
void	update_le (uint64_t val)
bool	valid_keylength (size_t length) const
bool	verify_mac (const uint8_t in[], size_t length)
bool	verify_mac (std::span< const uint8_t > in)

Static Public Member Functions
static std::unique_ptr< MessageAuthenticationCode >	create (std::string_view algo_spec, std::string_view provider="")
static std::unique_ptr< MessageAuthenticationCode >	create_or_throw (std::string_view algo_spec, std::string_view provider="")
static std::vector< std::string >	providers (std::string_view algo_spec)

Protected Member Functions
void	assert_key_material_set () const
void	assert_key_material_set (bool predicate) const
virtual bool	verify_mac_result (std::span< const uint8_t > in)

Detailed Description

CMAC, also known as OMAC1

Definition at line 19 of file cmac.h.

Constructor & Destructor Documentation

CMAC()

Botan::CMAC::CMAC ( std::unique_ptr< BlockCipher > cipher )

explicit

Parameters

cipher

the block cipher to use

Definition at line 125 of file cmac.cpp.

                                            : m_cipher(std::move(cipher)), m_block_size(m_cipher->block_size()) {
   if(!poly_double_supported_size(m_block_size)) {
      throw Invalid_Argument(fmt("CMAC cannot use the {} bit cipher {}", m_block_size * 8, m_cipher->name()));
   }
 
   m_state.resize(output_length());
   m_buffer.resize(output_length());
   m_B.resize(output_length());
   m_P.resize(output_length());
   m_position = 0;
}

References Botan::fmt(), output_length(), and Botan::poly_double_supported_size().

Member Function Documentation

assert_key_material_set() [1/2]

void Botan::SymmetricAlgorithm::assert_key_material_set ( ) const

inlineprotectedinherited

Throw Key_Not_Set unless a key has been set on this object

Definition at line 180 of file sym_algo.h.

{ assert_key_material_set(has_keying_material()); }

References assert_key_material_set(), and has_keying_material().

Referenced by assert_key_material_set(), Botan::Salsa20::cipher_bytes(), Botan::Lion::decrypt_n(), Botan::Lion::encrypt_n(), Botan::GHASH::final(), Botan::Polyval::final(), Botan::Salsa20::generate_keystream(), Botan::GHASH::nonce_hash(), Botan::GHASH::reset_associated_data(), Botan::ChaCha::seek(), Botan::CTR_BE::seek(), Botan::Salsa20::seek(), Botan::GHASH::set_associated_data(), Botan::OCB_Mode::set_associated_data_n(), Botan::Salsa20::set_iv_bytes(), Botan::GHASH::update(), Botan::Polyval::update(), Botan::GHASH::update_associated_data(), and Botan::Polyval::zero_pad().

assert_key_material_set() [2/2]

void Botan::SymmetricAlgorithm::assert_key_material_set ( bool predicate ) const

inlineprotectedinherited

Throw Key_Not_Set unless the predicate holds

Parameters

predicate

if false, a Key_Not_Set exception is thrown

Definition at line 186 of file sym_algo.h.

                                                         {
         if(!predicate) {
            throw_key_not_set_error();
         }
      }

clear()

void Botan::CMAC::clear ( )

overridevirtual

Reset the internal state. This includes not just the key, but any partial message that may have been in process.

Implements Botan::SymmetricAlgorithm.

Definition at line 99 of file cmac.cpp.

                 {
   m_cipher->clear();
   zeroise(m_state);
   zeroise(m_buffer);
   zeroise(m_B);
   zeroise(m_P);
   m_position = 0;
}

References Botan::zeroise().

clone()

MessageAuthenticationCode * Botan::MessageAuthenticationCode::clone ( ) const

inlineinherited

Get a new object representing the same algorithm as *this

Definition at line 104 of file mac.h.

{ return this->new_object().release(); }

References new_object().

create()

std::unique_ptr< MessageAuthenticationCode > Botan::MessageAuthenticationCode::create ( std::string_view algo_spec, std::string_view provider = "" )

staticinherited

Create an instance based on a name If provider is empty then best available is chosen.

Parameters

algo_spec	algorithm name
provider	provider implementation to use

Returns

a null pointer if the algo/provider combination cannot be found

Definition at line 50 of file mac.cpp.

                                                                                                      {
   const SCAN_Name req(algo_spec);
 
#if defined(BOTAN_HAS_BLAKE2BMAC)
   if(req.algo_name() == "Blake2b" || req.algo_name() == "BLAKE2b") {
      if(provider.empty() || provider == "base") {
         return std::make_unique<BLAKE2bMAC>(req.arg_as_integer(0, 512));
      }
   }
#endif
 
#if defined(BOTAN_HAS_GMAC)
   if(req.algo_name() == "GMAC" && req.arg_count() == 1) {
      if(provider.empty() || provider == "base") {
         if(auto bc = BlockCipher::create(req.arg(0))) {
            return std::make_unique<GMAC>(std::move(bc));
         }
      }
   }
#endif
 
#if defined(BOTAN_HAS_HMAC)
   if(req.algo_name() == "HMAC" && req.arg_count() == 1) {
      if(provider.empty() || provider == "base") {
         if(auto hash = HashFunction::create(req.arg(0))) {
            return std::make_unique<HMAC>(std::move(hash));
         }
      }
   }
#endif
 
#if defined(BOTAN_HAS_POLY1305)
   if(req.algo_name() == "Poly1305" && req.arg_count() == 0) {
      if(provider.empty() || provider == "base") {
         return std::make_unique<Poly1305>();
      }
   }
#endif
 
#if defined(BOTAN_HAS_SIPHASH)
   if(req.algo_name() == "SipHash") {
      if(provider.empty() || provider == "base") {
         return std::make_unique<SipHash>(req.arg_as_integer(0, 2), req.arg_as_integer(1, 4));
      }
   }
#endif
 
#if defined(BOTAN_HAS_CMAC)
   if((req.algo_name() == "CMAC" || req.algo_name() == "OMAC") && req.arg_count() == 1) {
      if(provider.empty() || provider == "base") {
         if(auto bc = BlockCipher::create(req.arg(0))) {
            return std::make_unique<CMAC>(std::move(bc));
         }
      }
   }
#endif
 
#if defined(BOTAN_HAS_ANSI_X919_MAC)
   if(req.algo_name() == "X9.19-MAC") {
      if(provider.empty() || provider == "base") {
         return std::make_unique<ANSI_X919_MAC>();
      }
   }
#endif
 
#if defined(BOTAN_HAS_KMAC)
   if(req.algo_name() == "KMAC-128") {
      if(provider.empty() || provider == "base") {
         if(req.arg_count() != 1) {
            throw Invalid_Argument(
               "invalid algorithm specification for KMAC-128: need exactly one argument for output bit length");
         }
         return std::make_unique<KMAC128>(req.arg_as_integer(0));
      }
   }
 
   if(req.algo_name() == "KMAC-256") {
      if(provider.empty() || provider == "base") {
         if(req.arg_count() != 1) {
            throw Invalid_Argument(
               "invalid algorithm specification for KMAC-256: need exactly one argument for output bit length");
         }
         return std::make_unique<KMAC256>(req.arg_as_integer(0));
      }
   }
#endif
 
   BOTAN_UNUSED(req);
   BOTAN_UNUSED(provider);
 
   return nullptr;
}

References Botan::SCAN_Name::algo_name(), Botan::SCAN_Name::arg(), Botan::SCAN_Name::arg_as_integer(), Botan::SCAN_Name::arg_count(), BOTAN_UNUSED, Botan::BlockCipher::create(), Botan::HashFunction::create(), and provider().

Referenced by botan_mac_init(), Botan::KDF::create(), Botan::PasswordHashFamily::create(), Botan::PBKDF::create(), and create_or_throw().

create_or_throw()

std::unique_ptr< MessageAuthenticationCode > Botan::MessageAuthenticationCode::create_or_throw ( std::string_view algo_spec, std::string_view provider = "" )

staticinherited

Create an instance based on a name, throwing if it is not available Create an instance based on a name If provider is empty then best available is chosen.

Parameters

algo_spec	algorithm name
provider	provider implementation to use Throws a Lookup_Error if algo/provider combination cannot be found

Definition at line 149 of file mac.cpp.

                                                                                                               {
   if(auto mac = MessageAuthenticationCode::create(algo, provider)) {
      return mac;
   }
   throw Lookup_Error("MAC", algo, provider);
}

References create(), and provider().

Referenced by Botan::ANSI_X919_MAC::ANSI_X919_MAC(), Botan::ChaCha_RNG::ChaCha_RNG(), Botan::ChaCha_RNG::ChaCha_RNG(), Botan::ChaCha_RNG::ChaCha_RNG(), Botan::ChaCha_RNG::ChaCha_RNG(), Botan::ChaCha_RNG::ChaCha_RNG(), Botan::TLS::Connection_Cipher_State::Connection_Cipher_State(), Botan::ECIES_System_Params::create_mac(), Botan::Sodium::crypto_auth_hmacsha256(), Botan::Sodium::crypto_auth_hmacsha512(), Botan::Sodium::crypto_auth_hmacsha512256(), Botan::Sodium::crypto_onetimeauth_poly1305(), Botan::Sodium::crypto_secretbox_detached(), Botan::Sodium::crypto_secretbox_open_detached(), Botan::Sodium::crypto_secretbox_xsalsa20poly1305(), Botan::Sodium::crypto_secretbox_xsalsa20poly1305_open(), Botan::Sodium::crypto_shorthash_siphash24(), Botan::TLS::Session::decrypt(), Botan::CryptoBox::decrypt_bin(), Botan::Scrypt::derive_key(), Botan::CryptoBox::encrypt(), Botan::TLS::Session::encrypt(), Botan::Encrypted_PSK_Database::Encrypted_PSK_Database(), Botan::PKCS12::export_to(), Botan::FPE_FE1::FPE_FE1(), Botan::TLS::Hello_Verify_Request::Hello_Verify_Request(), Botan::hkdf_expand_label(), Botan::HOTP::HOTP(), and Botan::RFC6979_Nonce_Generator::RFC6979_Nonce_Generator().

final() [1/4]

template<concepts::resizable_byte_buffer T = secure_vector<uint8_t>>

T Botan::Buffered_Computation::final ( )

inlineinherited

Complete the computation and retrieve the final result as a container.

Returns

a contiguous container holding the result

Definition at line 104 of file buf_comp.h.

                {
         T output(output_length());
         final_result(output);
         return output;
      }

References output_length().

final() [2/4]

void Botan::Buffered_Computation::final ( std::span< uint8_t > out )

inherited

Complete the computation and retrieve the final result

Parameters

out	the buffer to write the result to, must be output_length() bytes

Definition at line 54 of file buf_comp.cpp.

                                                     {
   BOTAN_ARG_CHECK(out.size() >= output_length(), "Output buffer has insufficient capacity");
   // Pass exactly output_length() bytes so that an oversized buffer has the
   // result written to its leading bytes with the remainder left untouched.
   final_result(out.first(output_length()));
}

References BOTAN_ARG_CHECK, and output_length().

final() [3/4]

template<concepts::resizable_byte_buffer T>

void Botan::Buffered_Computation::final ( T & out )

inlineinherited

Complete the computation and retrieve the final result

Parameters

out	a container which is resized to hold the result

Definition at line 127 of file buf_comp.h.

                         {
         out.resize(output_length());
         final_result(out);
      }

References output_length().

final() [4/4]

void Botan::Buffered_Computation::final ( uint8_t out[] )

inlineinherited

Complete the computation and retrieve the final result.

Parameters

out	The byte array to be filled with the result, which must be of length output_length()

Definition at line 97 of file buf_comp.h.

{ final_result({out, output_length()}); }

References output_length().

Referenced by Botan::expand_message_xmd(), final_stdvec(), Botan::PseudorandomKeyGeneration::gen(), Botan::TPM2::Verification_Operation::is_valid_signature(), Botan::mgf1_mask(), Botan::KMAC::operator=(), Botan::pbkdf2(), Botan::Sphincs_Hash_Functions_Sha2::PRF_msg(), process(), process(), process(), Botan::TPM2::Signature_Operation::sign(), and Botan::sm2_compute_za().

final_stdvec()

std::vector< uint8_t > Botan::Buffered_Computation::final_stdvec ( )

inlineinherited

Complete the computation and retrieve the final result

Returns

a std::vector holding the result

Definition at line 114 of file buf_comp.h.

{ return final<std::vector<uint8_t>>(); }

References final().

fresh_key_required_per_message()

virtual bool Botan::MessageAuthenticationCode::fresh_key_required_per_message ( ) const

inlinevirtualinherited

Returns

if a fresh key must be set for each message that is processed.

This is required for certain polynomial-based MACs which are insecure if a key is ever reused for two different messages.

Reimplemented in Botan::Poly1305.

Definition at line 119 of file mac.h.

{ return false; }

has_keying_material()

bool Botan::CMAC::has_keying_material ( ) const

overridevirtual

Test whether a key has been set on this object

Returns

true if a key has been set on this object

Implements Botan::SymmetricAlgorithm.

Definition at line 81 of file cmac.cpp.

                                     {
   return m_cipher->has_keying_material();
}

key_spec()

Key_Length_Specification Botan::CMAC::key_spec ( ) const

inlineoverridevirtual

Return the key lengths supported by this algorithm

Returns

object describing limits on key size

Implements Botan::SymmetricAlgorithm.

Definition at line 30 of file cmac.h.

{ return m_cipher->key_spec(); }

maximum_keylength()

size_t Botan::SymmetricAlgorithm::maximum_keylength ( ) const

inlineinherited

Return the largest acceptable key length

Returns

maximum allowed key length

Definition at line 130 of file sym_algo.h.

{ return key_spec().maximum_keylength(); }

References key_spec().

minimum_keylength()

size_t Botan::SymmetricAlgorithm::minimum_keylength ( ) const

inlineinherited

Return the smallest acceptable key length

Returns

minimum allowed key length

Definition at line 136 of file sym_algo.h.

{ return key_spec().minimum_keylength(); }

References key_spec().

name()

std::string Botan::CMAC::name ( ) const

overridevirtual

Return the name of this algorithm

Returns

the algorithm name

Implements Botan::SymmetricAlgorithm.

Definition at line 111 of file cmac.cpp.

                           {
   return fmt("CMAC({})", m_cipher->name());
}

References Botan::fmt().

new_object()

std::unique_ptr< MessageAuthenticationCode > Botan::CMAC::new_object ( ) const

overridevirtual

Create a new uninitialized object of the same type

Returns

new object representing the same algorithm as *this

Implements Botan::MessageAuthenticationCode.

Definition at line 118 of file cmac.cpp.

                                                                {
   return std::make_unique<CMAC>(m_cipher->new_object());
}

output_length()

size_t Botan::CMAC::output_length ( ) const

inlineoverridevirtual

Return the output length of this function

Returns

length of the output of this function in bytes

Implements Botan::Buffered_Computation.

Definition at line 23 of file cmac.h.

{ return m_block_size; }

Referenced by CMAC().

process() [1/3]

template<concepts::resizable_byte_buffer T = secure_vector<uint8_t>>

T Botan::Buffered_Computation::process ( const uint8_t in[], size_t length )

inlineinherited

Update and finalize computation. Does the same as calling update() and final() consecutively.

Parameters

in	the input to process as a byte array
length	the length of the byte array

Returns

the result of the call to final()

Definition at line 140 of file buf_comp.h.

                                                   {
         update(in, length);
         return final<T>();
      }

References final(), and update().

process() [2/3]

template<concepts::resizable_byte_buffer T = secure_vector<uint8_t>>

T Botan::Buffered_Computation::process ( std::span< const uint8_t > in )

inlineinherited

Update and finalize computation. Does the same as calling update() and final() consecutively.

Parameters

in	the input to process as a contiguous container

Returns

the result of the call to final()

Definition at line 164 of file buf_comp.h.

                                           {
         update(in);
         return final<T>();
      }

References final(), and update().

process() [3/3]

template<concepts::resizable_byte_buffer T = secure_vector<uint8_t>>

T Botan::Buffered_Computation::process ( std::string_view in )

inlineinherited

Update and finalize computation. Does the same as calling update() and final() consecutively.

Parameters

in	the input to process as a string

Returns

the result of the call to final()

Definition at line 152 of file buf_comp.h.

                                   {
         update(in);
         return final<T>();
      }

References final(), and update().

provider()

virtual std::string Botan::MessageAuthenticationCode::provider ( ) const

inlinevirtualinherited

Return the name of the provider implementing this object

Returns

provider information about this implementation. Default is "base", might also return "sse2", "avx2", "openssl", or some other arbitrary string.

Reimplemented in Botan::GMAC, Botan::KMAC, and Botan::Poly1305.

Definition at line 111 of file mac.h.

{ return "base"; }

Referenced by create(), and create_or_throw().

providers()

std::vector< std::string > Botan::MessageAuthenticationCode::providers ( std::string_view algo_spec )

staticinherited

List the providers available for a given MAC

Returns

list of available providers for this algorithm, empty if not available

Definition at line 144 of file mac.cpp.

                                                                                  {
   return probe_providers_of<MessageAuthenticationCode>(algo_spec);
}

References Botan::probe_providers_of().

set_key() [1/3]

void Botan::SymmetricAlgorithm::set_key ( const OctetString & key )

inherited

Set the symmetric key of this object.

Parameters

key	the SymmetricKey to be set.

Definition at line 14 of file sym_algo.cpp.

                                                       {
   set_key(std::span{key.begin(), key.length()});
}

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

Referenced by Botan::create_aes_row_generator(), Botan::Sodium::crypto_stream_salsa20(), Botan::Sodium::crypto_stream_salsa20_xor_ic(), Botan::Sodium::crypto_stream_xsalsa20(), Botan::Sodium::crypto_stream_xsalsa20_xor_ic(), Botan::FPE::fe1_decrypt(), Botan::FPE::fe1_encrypt(), Botan::Sphincs_Hash_Functions_Sha2::PRF_msg(), Botan::Sodium::randombytes_buf_deterministic(), Botan::TLS::TLS_NULL_HMAC_AEAD_Mode::reset(), and set_key().

set_key() [2/3]

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

inlineinherited

Set the symmetric key of this object.

Parameters

key	the to be set as a byte array.
length	in bytes of key param

Definition at line 162 of file sym_algo.h.

{ set_key(std::span{key, length}); }

References set_key().

Referenced by set_key().

set_key() [3/3]

void Botan::SymmetricAlgorithm::set_key ( std::span< const uint8_t > key )

inherited

Set the symmetric key of this object.

Parameters

key	the contiguous byte range to be set.

Definition at line 22 of file sym_algo.cpp.

                                                           {
   if(!valid_keylength(key.size())) {
      throw Invalid_Key_Length(name(), key.size());
   }
   key_schedule(key);
}

References name(), and valid_keylength().

start() [1/3]

void Botan::MessageAuthenticationCode::start ( )

inlineinherited

Begin processing a message.

Definition at line 78 of file mac.h.

{ return start_msg({}); }

References start_msg().

start() [2/3]

void Botan::MessageAuthenticationCode::start ( const uint8_t nonce[], size_t nonce_len )

inlineinherited

Begin processing a message.

Parameters

nonce	the per message nonce
nonce_len	length of nonce

Definition at line 73 of file mac.h.

{ start_msg({nonce, nonce_len}); }

References start_msg().

start() [3/3]

void Botan::MessageAuthenticationCode::start ( std::span< const uint8_t > nonce )

inlineinherited

Prepare for processing a message under the specified nonce Calling start() abandons any partial message and begins a new one.

Most MACs neither require nor support a nonce; for these algorithms calling start() is optional and calling it with anything other than an empty string is an error. One MAC which requires a per-message nonce be specified is GMAC.

Default implementation simply rejects all non-empty nonces since most hash/MAC algorithms do not support randomization

Parameters

nonce

the message nonce bytes

Definition at line 66 of file mac.h.

{ start_msg(nonce); }

References start_msg().

update() [1/4]

void Botan::Buffered_Computation::update ( const uint8_t in[], size_t length )

inlineinherited

Add new input to process.

Parameters

in	the input to process as a byte array
length	of param in in bytes

Definition at line 35 of file buf_comp.h.

{ add_data({in, length}); }

Referenced by Botan::expand_message_xmd(), Botan::PseudorandomKeyGeneration::gen(), Botan::LMOTS_Public_Key::LMOTS_Public_Key(), Botan::mgf1_mask(), Botan::pbkdf2(), Botan::Sphincs_Hash_Functions_Sha2::PRF_msg(), process(), process(), process(), and Botan::sm2_compute_za().

update() [2/4]

void Botan::Buffered_Computation::update ( std::span< const uint8_t > in )

inlineinherited

Add new input to process.

Parameters

in	the input to process as a contiguous data range

Definition at line 41 of file buf_comp.h.

{ add_data(in); }

update() [3/4]

void Botan::Buffered_Computation::update ( std::string_view str )

inherited

Add new input to process.

Parameters

str	the input to process as a std::string_view. Will be interpreted as a byte array based on the strings encoding.

Definition at line 14 of file buf_comp.cpp.

                                                    {
   add_data(as_span_of_bytes(str));
}

References Botan::as_span_of_bytes().

update() [4/4]

void Botan::Buffered_Computation::update ( uint8_t in )

inlineinherited

Process a single byte.

Parameters

in	the byte to process

Definition at line 90 of file buf_comp.h.

{ add_data({&in, 1}); }

update_be() [1/3]

void Botan::Buffered_Computation::update_be ( uint16_t val )

inherited

Add new input to process, encoded as a big-endian integer

Parameters

val	the value to process

Definition at line 18 of file buf_comp.cpp.

                                                 {
   uint8_t inb[sizeof(val)];
   store_be(val, inb);
   add_data({inb, sizeof(inb)});
}

References Botan::store_be().

Referenced by Botan::expand_message_xmd(), Botan::mgf1_mask(), and Botan::pbkdf2().

update_be() [2/3]

void Botan::Buffered_Computation::update_be ( uint32_t val )

inherited

Add new input to process, encoded as a big-endian integer

Parameters

val	the value to process

Definition at line 24 of file buf_comp.cpp.

                                                 {
   uint8_t inb[sizeof(val)];
   store_be(val, inb);
   add_data({inb, sizeof(inb)});
}

References Botan::store_be().

update_be() [3/3]

void Botan::Buffered_Computation::update_be ( uint64_t val )

inherited

Add new input to process, encoded as a big-endian integer

Parameters

val	the value to process

Definition at line 30 of file buf_comp.cpp.

                                                 {
   uint8_t inb[sizeof(val)];
   store_be(val, inb);
   add_data({inb, sizeof(inb)});
}

References Botan::store_be().

update_le() [1/3]

void Botan::Buffered_Computation::update_le ( uint16_t val )

inherited

Add new input to process, encoded as a little-endian integer

Parameters

val	the value to process

Definition at line 36 of file buf_comp.cpp.

                                                 {
   uint8_t inb[sizeof(val)];
   store_le(val, inb);
   add_data({inb, sizeof(inb)});
}

References Botan::store_le().

update_le() [2/3]

void Botan::Buffered_Computation::update_le ( uint32_t val )

inherited

Add new input to process, encoded as a little-endian integer

Parameters

val	the value to process

Definition at line 42 of file buf_comp.cpp.

                                                 {
   uint8_t inb[sizeof(val)];
   store_le(val, inb);
   add_data({inb, sizeof(inb)});
}

References Botan::store_le().

update_le() [3/3]

void Botan::Buffered_Computation::update_le ( uint64_t val )

inherited

Add new input to process, encoded as a little-endian integer

Parameters

val	the value to process

Definition at line 48 of file buf_comp.cpp.

                                                 {
   uint8_t inb[sizeof(val)];
   store_le(val, inb);
   add_data({inb, sizeof(inb)});
}

References Botan::store_le().

valid_keylength()

bool Botan::SymmetricAlgorithm::valid_keylength ( size_t length ) const

inlineinherited

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

Parameters

length

the key length to be checked.

Returns

true if the key length is valid.

Definition at line 143 of file sym_algo.h.

{ return key_spec().valid_keylength(length); }

References key_spec().

Referenced by set_key().

verify_mac() [1/2]

bool Botan::MessageAuthenticationCode::verify_mac ( const uint8_t in[], size_t length )

inlineinherited

Verify a MAC.

Parameters

in	the MAC to verify as a byte array
length	the length of param in

Returns

true if the MAC is valid, false otherwise

Definition at line 86 of file mac.h.

{ return verify_mac_result({in, length}); }

References verify_mac_result().

verify_mac() [2/2]

bool Botan::MessageAuthenticationCode::verify_mac ( std::span< const uint8_t > in )

inlineinherited

Verify a MAC.

Parameters

in	the MAC to verify as a byte array

Returns

true if the MAC is valid, false otherwise

Definition at line 93 of file mac.h.

{ return verify_mac_result(in); }

References verify_mac_result().

verify_mac_result()

bool Botan::MessageAuthenticationCode::verify_mac_result ( std::span< const uint8_t > in )

protectedvirtualinherited

Verify the MACs final result

Definition at line 160 of file mac.cpp.

                                                                            {
   secure_vector<uint8_t> our_mac = final();
 
   if(our_mac.size() != mac.size()) {
      return false;
   }
 
   return CT::is_equal(our_mac.data(), mac.data(), mac.size()).as_bool();
}

References Botan::CT::is_equal().

Referenced by start_msg(), verify_mac(), and verify_mac().

---

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

• src/lib/mac/cmac/cmac.h
• src/lib/mac/cmac/cmac.cpp