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

#include <des.h>

Inheritance diagram for Botan::TripleDES:
Botan::Block_Cipher_Fixed_Params< 8, 16, 24, 8 > Botan::BlockCipher Botan::SymmetricAlgorithm Botan::Algorithm

Public Types

enum  
 

Public Member Functions

size_t block_size () const
 
void clear ()
 
BlockCipherclone () const
 
void decrypt (const byte in[], byte out[]) const
 
void decrypt (byte block[]) const
 
void decrypt_n (const byte in[], byte out[], size_t blocks) const
 
void encrypt (const byte in[], byte out[]) const
 
void encrypt (byte block[]) const
 
void encrypt_n (const byte in[], byte out[], size_t blocks) const
 
Key_Length_Specification key_spec () const
 
size_t maximum_keylength () const
 
size_t minimum_keylength () const
 
std::string name () const
 
size_t parallel_bytes () const
 
virtual size_t parallelism () const
 
void set_key (const SymmetricKey &key)
 
void set_key (const byte key[], size_t length)
 
 TripleDES ()
 
bool valid_keylength (size_t length) const
 

Detailed Description

Triple DES

Definition at line 38 of file des.h.

Member Enumeration Documentation

anonymous enum
inherited

Constructor & Destructor Documentation

Botan::TripleDES::TripleDES ( )
inline

Definition at line 48 of file des.h.

48 : round_key(96) {}

Member Function Documentation

size_t Botan::Block_Cipher_Fixed_Params< BS, KMIN, KMAX, KMOD >::block_size ( ) const
inlinevirtualinherited
Returns
block size of this algorithm

Implements Botan::BlockCipher.

Definition at line 108 of file block_cipher.h.

108 { return BS; }
void Botan::TripleDES::clear ( )
inlinevirtual

Zeroize internal state

Implements Botan::Algorithm.

Definition at line 44 of file des.h.

References Botan::zeroise().

44 { zeroise(round_key); }
void zeroise(MemoryRegion< T > &vec)
Definition: secmem.h:415
BlockCipher* Botan::TripleDES::clone ( ) const
inlinevirtual

Get a new object representing the same algorithm as *this

Implements Botan::BlockCipher.

Definition at line 46 of file des.h.

46 { return new TripleDES; }
void Botan::BlockCipher::decrypt ( const byte  in[],
byte  out[] 
) const
inlineinherited

Decrypt a block.

Parameters
inThe ciphertext block to be decypted as a byte array. Must be of length block_size().
outThe byte array designated to hold the decrypted block. Must be of length block_size().

Definition at line 57 of file block_cipher.h.

Referenced by Botan::DESX::decrypt_n().

58  { decrypt_n(in, out, 1); }
virtual void decrypt_n(const byte in[], byte out[], size_t blocks) const =0
void Botan::BlockCipher::decrypt ( byte  block[]) const
inlineinherited

Decrypt a block.

Parameters
blockthe ciphertext block to be decrypted Must be of length block_size(). Will hold the result when the function has finished.

Definition at line 74 of file block_cipher.h.

74 { decrypt_n(block, block, 1); }
virtual void decrypt_n(const byte in[], byte out[], size_t blocks) const =0
void Botan::TripleDES::decrypt_n ( const byte  in[],
byte  out[],
size_t  blocks 
) const
virtual

Decrypt one or more blocks

Parameters
inthe input buffer (multiple of block_size())
outthe output buffer (same size as in)
blocksthe number of blocks to process

Implements Botan::BlockCipher.

Definition at line 248 of file des.cpp.

References Botan::Block_Cipher_Fixed_Params< 8, 16, 24, 8 >::BLOCK_SIZE, Botan::DES_FPTAB1, Botan::DES_FPTAB2, Botan::DES_IPTAB1, Botan::DES_IPTAB2, Botan::get_byte(), Botan::rotate_left(), and Botan::store_be().

249  {
250  for(size_t i = 0; i != blocks; ++i)
251  {
252  u64bit T = (DES_IPTAB1[in[0]] ) | (DES_IPTAB1[in[1]] << 1) |
253  (DES_IPTAB1[in[2]] << 2) | (DES_IPTAB1[in[3]] << 3) |
254  (DES_IPTAB1[in[4]] << 4) | (DES_IPTAB1[in[5]] << 5) |
255  (DES_IPTAB1[in[6]] << 6) | (DES_IPTAB2[in[7]] );
256 
257  u32bit L = static_cast<u32bit>(T >> 32);
258  u32bit R = static_cast<u32bit>(T);
259 
260  des_decrypt(L, R, &round_key[64]);
261  des_encrypt(R, L, &round_key[32]);
262  des_decrypt(L, R, &round_key[0]);
263 
264  T = (DES_FPTAB1[get_byte(0, L)] << 5) | (DES_FPTAB1[get_byte(1, L)] << 3) |
265  (DES_FPTAB1[get_byte(2, L)] << 1) | (DES_FPTAB2[get_byte(3, L)] << 1) |
266  (DES_FPTAB1[get_byte(0, R)] << 4) | (DES_FPTAB1[get_byte(1, R)] << 2) |
267  (DES_FPTAB1[get_byte(2, R)] ) | (DES_FPTAB2[get_byte(3, R)] );
268 
269  T = rotate_left(T, 32);
270 
271  store_be(T, out);
272 
273  in += BLOCK_SIZE;
274  out += BLOCK_SIZE;
275  }
276  }
const u64bit DES_IPTAB1[256]
Definition: des_tab.cpp:372
T rotate_left(T input, size_t rot)
Definition: rotate.h:21
byte get_byte(size_t byte_num, T input)
Definition: get_byte.h:21
unsigned long long u64bit
Definition: types.h:49
const u64bit DES_IPTAB2[256]
Definition: des_tab.cpp:438
const u64bit DES_FPTAB2[256]
Definition: des_tab.cpp:570
void store_be(u16bit in, byte out[2])
Definition: loadstor.h:412
const u64bit DES_FPTAB1[256]
Definition: des_tab.cpp:504
unsigned int u32bit
Definition: types.h:32
void Botan::BlockCipher::encrypt ( const byte  in[],
byte  out[] 
) const
inlineinherited

Encrypt a block.

Parameters
inThe plaintext block to be encrypted as a byte array. Must be of length block_size().
outThe byte array designated to hold the encrypted block. Must be of length block_size().

Definition at line 47 of file block_cipher.h.

Referenced by Botan::aont_package(), Botan::aont_unpackage(), Botan::OFB::cipher(), Botan::DESX::encrypt_n(), Botan::CFB_Encryption::set_iv(), Botan::OFB::set_iv(), Botan::XTS_Encryption::set_iv(), Botan::CFB_Decryption::set_iv(), and Botan::XTS_Decryption::set_iv().

48  { encrypt_n(in, out, 1); }
virtual void encrypt_n(const byte in[], byte out[], size_t blocks) const =0
void Botan::BlockCipher::encrypt ( byte  block[]) const
inlineinherited

Encrypt a block.

Parameters
blockthe plaintext block to be encrypted Must be of length block_size(). Will hold the result when the function has finished.

Definition at line 66 of file block_cipher.h.

66 { encrypt_n(block, block, 1); }
virtual void encrypt_n(const byte in[], byte out[], size_t blocks) const =0
void Botan::TripleDES::encrypt_n ( const byte  in[],
byte  out[],
size_t  blocks 
) const
virtual

Encrypt one or more blocks

Parameters
inthe input buffer (multiple of block_size())
outthe output buffer (same size as in)
blocksthe number of blocks to process

Implements Botan::BlockCipher.

Definition at line 215 of file des.cpp.

References Botan::Block_Cipher_Fixed_Params< 8, 16, 24, 8 >::BLOCK_SIZE, Botan::DES_FPTAB1, Botan::DES_FPTAB2, Botan::DES_IPTAB1, Botan::DES_IPTAB2, Botan::get_byte(), Botan::rotate_left(), and Botan::store_be().

216  {
217  for(size_t i = 0; i != blocks; ++i)
218  {
219  u64bit T = (DES_IPTAB1[in[0]] ) | (DES_IPTAB1[in[1]] << 1) |
220  (DES_IPTAB1[in[2]] << 2) | (DES_IPTAB1[in[3]] << 3) |
221  (DES_IPTAB1[in[4]] << 4) | (DES_IPTAB1[in[5]] << 5) |
222  (DES_IPTAB1[in[6]] << 6) | (DES_IPTAB2[in[7]] );
223 
224  u32bit L = static_cast<u32bit>(T >> 32);
225  u32bit R = static_cast<u32bit>(T);
226 
227  des_encrypt(L, R, &round_key[0]);
228  des_decrypt(R, L, &round_key[32]);
229  des_encrypt(L, R, &round_key[64]);
230 
231  T = (DES_FPTAB1[get_byte(0, L)] << 5) | (DES_FPTAB1[get_byte(1, L)] << 3) |
232  (DES_FPTAB1[get_byte(2, L)] << 1) | (DES_FPTAB2[get_byte(3, L)] << 1) |
233  (DES_FPTAB1[get_byte(0, R)] << 4) | (DES_FPTAB1[get_byte(1, R)] << 2) |
234  (DES_FPTAB1[get_byte(2, R)] ) | (DES_FPTAB2[get_byte(3, R)] );
235 
236  T = rotate_left(T, 32);
237 
238  store_be(T, out);
239 
240  in += BLOCK_SIZE;
241  out += BLOCK_SIZE;
242  }
243  }
const u64bit DES_IPTAB1[256]
Definition: des_tab.cpp:372
T rotate_left(T input, size_t rot)
Definition: rotate.h:21
byte get_byte(size_t byte_num, T input)
Definition: get_byte.h:21
unsigned long long u64bit
Definition: types.h:49
const u64bit DES_IPTAB2[256]
Definition: des_tab.cpp:438
const u64bit DES_FPTAB2[256]
Definition: des_tab.cpp:570
void store_be(u16bit in, byte out[2])
Definition: loadstor.h:412
const u64bit DES_FPTAB1[256]
Definition: des_tab.cpp:504
unsigned int u32bit
Definition: types.h:32
Key_Length_Specification Botan::Block_Cipher_Fixed_Params< BS, KMIN, KMAX, KMOD >::key_spec ( ) const
inlinevirtualinherited
Returns
object describing limits on key size

Implements Botan::SymmetricAlgorithm.

Definition at line 110 of file block_cipher.h.

111  {
112  return Key_Length_Specification(KMIN, KMAX, KMOD);
113  }
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::TripleDES::name ( ) const
inlinevirtual
Returns
name of this algorithm

Implements Botan::Algorithm.

Definition at line 45 of file des.h.

45 { return "TripleDES"; }
size_t Botan::BlockCipher::parallel_bytes ( ) const
inlineinherited
Returns
prefererred parallelism of this cipher in bytes

Definition at line 35 of file block_cipher.h.

References block_size.

36  {
37  return parallelism() * block_size() * BOTAN_BLOCK_CIPHER_PAR_MULT;
38  }
virtual size_t parallelism() const
Definition: block_cipher.h:30
virtual size_t block_size() const =0
virtual size_t Botan::BlockCipher::parallelism ( ) const
inlinevirtualinherited
Returns
native parallelism of this cipher in blocks

Reimplemented in Botan::AES_256_NI, Botan::AES_192_NI, Botan::AES_128_NI, Botan::IDEA_SSE2, Botan::Noekeon_SIMD, Botan::Serpent_SIMD, and Botan::XTEA_SIMD.

Definition at line 30 of file block_cipher.h.

30 { return 1; }
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::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: