Botan  1.10.9
Public Member Functions | List of all members
Botan::WiderWake_41_BE Class Reference

#include <wid_wake.h>

Inheritance diagram for Botan::WiderWake_41_BE:
Botan::StreamCipher Botan::SymmetricAlgorithm Botan::Algorithm

Public Member Functions

void cipher (const byte[], byte[], size_t)
 
void cipher1 (byte buf[], size_t len)
 
void clear ()
 
StreamCipherclone () const
 
Key_Length_Specification key_spec () const
 
size_t maximum_keylength () const
 
size_t minimum_keylength () const
 
std::string name () const
 
void set_iv (const byte[], size_t)
 
void set_key (const SymmetricKey &key)
 
void set_key (const byte key[], size_t length)
 
bool valid_iv_length (size_t iv_len) const
 
bool valid_keylength (size_t length) const
 
 WiderWake_41_BE ()
 

Detailed Description

WiderWake4+1-BE

Note: quite old and possibly not safe; use XSalsa20 or a block cipher in counter mode.

Definition at line 21 of file wid_wake.h.

Constructor & Destructor Documentation

Botan::WiderWake_41_BE::WiderWake_41_BE ( )
inline

Definition at line 39 of file wid_wake.h.

39  : T(256), state(5), t_key(4),
40  buffer(DEFAULT_BUFFERSIZE), position(0)
41  {}
RC4_KEY state
Definition: ossl_arc4.cpp:39

Member Function Documentation

void Botan::WiderWake_41_BE::cipher ( const byte  in[],
byte  out[],
size_t  len 
)
virtual

Encrypt or decrypt a message

Parameters
inthe plaintext
outthe byte array to hold the output, i.e. the ciphertext
lenthe length of both in and out in bytes

Implements Botan::StreamCipher.

Definition at line 17 of file wid_wake.cpp.

References Botan::MemoryRegion< T >::size(), and Botan::xor_buf().

18  {
19  while(length >= buffer.size() - position)
20  {
21  xor_buf(out, in, &buffer[position], buffer.size() - position);
22  length -= (buffer.size() - position);
23  in += (buffer.size() - position);
24  out += (buffer.size() - position);
25  generate(buffer.size());
26  }
27  xor_buf(out, in, &buffer[position], length);
28  position += length;
29  }
size_t size() const
Definition: secmem.h:29
void xor_buf(byte out[], const byte in[], size_t length)
Definition: xor_buf.h:21
void Botan::StreamCipher::cipher1 ( byte  buf[],
size_t  len 
)
inlineinherited

Encrypt or decrypt a message

Parameters
bufthe plaintext / ciphertext
lenthe length of buf in bytes

Definition at line 34 of file stream_cipher.h.

Referenced by Botan::Lion::decrypt_n(), and Botan::Lion::encrypt_n().

35  { cipher(buf, buf, len); }
virtual void cipher(const byte in[], byte out[], size_t len)=0
void Botan::WiderWake_41_BE::clear ( )
virtual

Zeroize internal state

Implements Botan::Algorithm.

Definition at line 143 of file wid_wake.cpp.

References Botan::zeroise().

144  {
145  position = 0;
146  zeroise(t_key);
147  zeroise(state);
148  zeroise(T);
149  zeroise(buffer);
150  }
RC4_KEY state
Definition: ossl_arc4.cpp:39
void zeroise(MemoryRegion< T > &vec)
Definition: secmem.h:415
StreamCipher* Botan::WiderWake_41_BE::clone ( ) const
inlinevirtual

Get a new object representing the same algorithm as *this

Implements Botan::StreamCipher.

Definition at line 37 of file wid_wake.h.

37 { return new WiderWake_41_BE; }
Key_Length_Specification Botan::WiderWake_41_BE::key_spec ( ) const
inlinevirtual
Returns
object describing limits on key size

Implements Botan::SymmetricAlgorithm.

Definition at line 30 of file wid_wake.h.

31  {
32  return Key_Length_Specification(16);
33  }
size_t Botan::SymmetricAlgorithm::maximum_keylength ( ) const
inlineinherited
Returns
minimum allowed key length

Definition at line 33 of file sym_algo.h.

34  {
35  return key_spec().maximum_keylength();
36  }
size_t maximum_keylength() const
Definition: key_spec.h:69
virtual Key_Length_Specification key_spec() const =0
size_t Botan::SymmetricAlgorithm::minimum_keylength ( ) const
inlineinherited
Returns
maxmium allowed key length

Definition at line 41 of file sym_algo.h.

42  {
43  return key_spec().minimum_keylength();
44  }
size_t minimum_keylength() const
Definition: key_spec.h:61
virtual Key_Length_Specification key_spec() const =0
std::string Botan::WiderWake_41_BE::name ( ) const
inlinevirtual
Returns
name of this algorithm

Implements Botan::Algorithm.

Definition at line 36 of file wid_wake.h.

Referenced by set_iv().

36 { return "WiderWake4+1-BE"; }
void Botan::WiderWake_41_BE::set_iv ( const byte  iv[],
size_t  iv_len 
)
virtual

Resync the cipher using the IV

Parameters
ivthe initialization vector
iv_lenthe length of the IV in bytes

Reimplemented from Botan::StreamCipher.

Definition at line 124 of file wid_wake.cpp.

References Botan::load_be< u32bit >(), name(), Botan::MemoryRegion< T >::size(), and valid_iv_length().

125  {
126  if(!valid_iv_length(length))
127  throw Invalid_IV_Length(name(), length);
128 
129  for(size_t i = 0; i != 4; ++i)
130  state[i] = t_key[i];
131 
132  state[4] = load_be<u32bit>(iv, 0);
133  state[0] ^= state[4];
134  state[2] ^= load_be<u32bit>(iv, 1);
135 
136  generate(8*4);
137  generate(buffer.size());
138  }
RC4_KEY state
Definition: ossl_arc4.cpp:39
size_t size() const
Definition: secmem.h:29
u32bit load_be< u32bit >(const byte in[], size_t off)
Definition: loadstor.h:166
std::string name() const
Definition: wid_wake.h:36
bool valid_iv_length(size_t iv_len) const
Definition: wid_wake.h:27
void Botan::SymmetricAlgorithm::set_key ( const SymmetricKey key)
inlineinherited
void Botan::SymmetricAlgorithm::set_key ( const byte  key[],
size_t  length 
)
inlineinherited

Set the symmetric key of this object.

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

Definition at line 68 of file sym_algo.h.

69  {
70  if(!valid_keylength(length))
71  throw Invalid_Key_Length(name(), length);
72  key_schedule(key, length);
73  }
bool valid_keylength(size_t length) const
Definition: sym_algo.h:51
virtual std::string name() const =0
bool Botan::WiderWake_41_BE::valid_iv_length ( size_t  iv_len) const
inlinevirtual
Parameters
iv_lenthe length of the IV in bytes
Returns
if the length is valid for this algorithm

Reimplemented from Botan::StreamCipher.

Definition at line 27 of file wid_wake.h.

Referenced by set_iv().

28  { return (iv_len == 8); }
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 51 of file sym_algo.h.

Referenced by Botan::aont_package(), Botan::aont_unpackage(), Botan::HMAC_RNG::HMAC_RNG(), Botan::Lion::Lion(), Botan::Randpool::Randpool(), and Botan::EAX_Base::valid_keylength().

52  {
53  return key_spec().valid_keylength(length);
54  }
bool valid_keylength(size_t length) const
Definition: key_spec.h:51
virtual Key_Length_Specification key_spec() const =0

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