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

#include <safer_sk.h>

Inheritance diagram for Botan::SAFER_SK:
Botan::Block_Cipher_Fixed_Params< 8, 16 > 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
 
 SAFER_SK (size_t rounds)
 
void set_key (const SymmetricKey &key)
 
void set_key (const byte key[], size_t length)
 
bool valid_keylength (size_t length) const
 

Detailed Description

SAFER-SK

Definition at line 18 of file safer_sk.h.

Member Enumeration Documentation

anonymous enum
inherited

Constructor & Destructor Documentation

Botan::SAFER_SK::SAFER_SK ( size_t  rounds)
Parameters
roundsthe number of rounds to use - must be between 1 and 13

Definition at line 247 of file safer_sk.cpp.

References name(), and Botan::MemoryRegion< T >::resize().

Referenced by clone().

248  {
249  if(rounds > 13 || rounds == 0)
250  throw Invalid_Argument(name() + ": Invalid number of rounds");
251 
252  EK.resize(16 * rounds + 8);
253  }
void resize(size_t n)
Definition: secmem.h:211
std::invalid_argument Invalid_Argument
Definition: exceptn.h:20
std::string name() const
Definition: safer_sk.cpp:231

Member Function Documentation

size_t Botan::Block_Cipher_Fixed_Params< BS, KMIN, 0 , 1 >::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::SAFER_SK::clear ( )
inlinevirtual

Zeroize internal state

Implements Botan::Algorithm.

Definition at line 24 of file safer_sk.h.

References Botan::zeroise().

24 { zeroise(EK); }
void zeroise(MemoryRegion< T > &vec)
Definition: secmem.h:415
BlockCipher * Botan::SAFER_SK::clone ( ) const
virtual

Get a new object representing the same algorithm as *this

Implements Botan::BlockCipher.

Definition at line 239 of file safer_sk.cpp.

References SAFER_SK().

240  {
241  return new SAFER_SK(get_rounds());
242  }
SAFER_SK(size_t rounds)
Definition: safer_sk.cpp:247
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::SAFER_SK::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 129 of file safer_sk.cpp.

References Botan::Block_Cipher_Fixed_Params< 8, 16 >::BLOCK_SIZE.

130  {
131  const size_t rounds = get_rounds();
132 
133  for(size_t i = 0; i != blocks; ++i)
134  {
135  byte A = in[0], B = in[1], C = in[2], D = in[3],
136  E = in[4], F = in[5], G = in[6], H = in[7];
137 
138  A ^= EK[16*rounds+0]; B -= EK[16*rounds+1]; C -= EK[16*rounds+2];
139  D ^= EK[16*rounds+3]; E ^= EK[16*rounds+4]; F -= EK[16*rounds+5];
140  G -= EK[16*rounds+6]; H ^= EK[16*rounds+7];
141 
142  for(s32bit j = 16*(rounds-1); j >= 0; j -= 16)
143  {
144  byte T = E; E = B; B = C; C = T; T = F; F = D; D = G; G = T;
145  A -= E; B -= F; C -= G; D -= H; E -= A; F -= B; G -= C; H -= D;
146  A -= C; E -= G; B -= D; F -= H; C -= A; G -= E; D -= B; H -= F;
147  A -= B; C -= D; E -= F; G -= H; B -= A; D -= C; F -= E; H -= G;
148 
149  A = LOG[A - EK[j+8 ] + 256]; B = EXP[B ^ EK[j+9 ]];
150  C = EXP[C ^ EK[j+10]]; D = LOG[D - EK[j+11] + 256];
151  E = LOG[E - EK[j+12] + 256]; F = EXP[F ^ EK[j+13]];
152  G = EXP[G ^ EK[j+14]]; H = LOG[H - EK[j+15] + 256];
153 
154  A ^= EK[j+0]; B -= EK[j+1]; C -= EK[j+2]; D ^= EK[j+3];
155  E ^= EK[j+4]; F -= EK[j+5]; G -= EK[j+6]; H ^= EK[j+7];
156  }
157 
158  out[0] = A; out[1] = B; out[2] = C; out[3] = D;
159  out[4] = E; out[5] = F; out[6] = G; out[7] = H;
160 
161  in += BLOCK_SIZE;
162  out += BLOCK_SIZE;
163  }
164  }
signed int s32bit
Definition: types.h:37
unsigned char byte
Definition: types.h:22
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::SAFER_SK::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 91 of file safer_sk.cpp.

References Botan::Block_Cipher_Fixed_Params< 8, 16 >::BLOCK_SIZE.

92  {
93  const size_t rounds = get_rounds();
94 
95  for(size_t i = 0; i != blocks; ++i)
96  {
97  byte A = in[0], B = in[1], C = in[2], D = in[3],
98  E = in[4], F = in[5], G = in[6], H = in[7], X, Y;
99 
100  for(size_t j = 0; j != 16*rounds; j += 16)
101  {
102  A = EXP[A ^ EK[j ]]; B = LOG[B + EK[j+1]];
103  C = LOG[C + EK[j+2]]; D = EXP[D ^ EK[j+3]];
104  E = EXP[E ^ EK[j+4]]; F = LOG[F + EK[j+5]];
105  G = LOG[G + EK[j+6]]; H = EXP[H ^ EK[j+7]];
106 
107  A += EK[j+ 8]; B ^= EK[j+ 9]; C ^= EK[j+10]; D += EK[j+11];
108  E += EK[j+12]; F ^= EK[j+13]; G ^= EK[j+14]; H += EK[j+15];
109 
110  B += A; D += C; F += E; H += G; A += B; C += D; E += F; G += H;
111  C += A; G += E; D += B; H += F; A += C; E += G; B += D; F += H;
112  H += D; Y = D + H; D = B + F; X = B + D; B = A + E;
113  A += B; F = C + G; E = C + F; C = X; G = Y;
114  }
115 
116  out[0] = A ^ EK[16*rounds+0]; out[1] = B + EK[16*rounds+1];
117  out[2] = C + EK[16*rounds+2]; out[3] = D ^ EK[16*rounds+3];
118  out[4] = E ^ EK[16*rounds+4]; out[5] = F + EK[16*rounds+5];
119  out[6] = G + EK[16*rounds+6]; out[7] = H ^ EK[16*rounds+7];
120 
121  in += BLOCK_SIZE;
122  out += BLOCK_SIZE;
123  }
124  }
unsigned char byte
Definition: types.h:22
Key_Length_Specification Botan::Block_Cipher_Fixed_Params< BS, KMIN, 0 , 1 >::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::SAFER_SK::name ( ) const
virtual
Returns
name of this algorithm

Implements Botan::Algorithm.

Definition at line 231 of file safer_sk.cpp.

References Botan::to_string().

Referenced by SAFER_SK().

232  {
233  return "SAFER-SK(" + to_string(get_rounds()) + ")";
234  }
std::string to_string(u64bit n, size_t min_len)
Definition: parsing.cpp:42
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: