Botan  1.11.15
Public Types | Public Member Functions
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

List of all members.

Public Types

enum  
typedef SCAN_Name Spec

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
template<typename Alloc >
void decrypt (std::vector< byte, Alloc > &block) const
template<typename Alloc , typename Alloc2 >
void decrypt (const std::vector< byte, Alloc > &in, std::vector< byte, Alloc2 > &out) 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
template<typename Alloc >
void encrypt (std::vector< byte, Alloc > &block) const
template<typename Alloc , typename Alloc2 >
void encrypt (const std::vector< byte, Alloc > &in, std::vector< byte, Alloc2 > &out) 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)
template<typename Alloc >
void set_key (const std::vector< byte, Alloc > &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 Typedef Documentation

typedef SCAN_Name Botan::BlockCipher::Spec [inherited]

Definition at line 22 of file block_cipher.h.


Member Enumeration Documentation

anonymous enum [inherited]

Definition at line 153 of file block_cipher.h.

{ BLOCK_SIZE = BS };

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 251 of file safer_sk.cpp.

References name().

Referenced by clone().

                           : rounds(r)
   {
   if(rounds > 13 || rounds == 0)
      throw Invalid_Argument(name() + ": Invalid number of rounds");
   }

Member Function Documentation

size_t Botan::Block_Cipher_Fixed_Params< BS, KMIN, 0 , 1 >::block_size ( ) const [inline, virtual, inherited]
Returns:
block size of this algorithm

Implements Botan::BlockCipher.

Definition at line 154 of file block_cipher.h.

{ return BS; }
void Botan::SAFER_SK::clear ( ) [virtual]

Implements Botan::SymmetricAlgorithm.

Definition at line 227 of file safer_sk.cpp.

References Botan::zap().

   {
   zap(EK);
   }
BlockCipher * Botan::SAFER_SK::clone ( ) const [virtual]
Returns:
new object representing the same algorithm as *this

Implements Botan::BlockCipher.

Definition at line 243 of file safer_sk.cpp.

References SAFER_SK().

   {
   return new SAFER_SK(rounds);
   }
void Botan::BlockCipher::decrypt ( const byte  in[],
byte  out[] 
) const [inline, inherited]

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 59 of file block_cipher.h.

Referenced by Botan::Camellia_128::decrypt_n(), Botan::DESX::decrypt_n(), Botan::Camellia_192::decrypt_n(), Botan::Camellia_256::decrypt_n(), Botan::XTS_Decryption::finish(), and Botan::CTS_Decryption::finish().

         { decrypt_n(in, out, 1); }
void Botan::BlockCipher::decrypt ( byte  block[]) const [inline, inherited]

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 76 of file block_cipher.h.

{ decrypt_n(block, block, 1); }
template<typename Alloc >
void Botan::BlockCipher::decrypt ( std::vector< byte, Alloc > &  block) const [inline, inherited]

Decrypt one or more blocks

Parameters:
blockthe input/output buffer (multiple of block_size())

Definition at line 93 of file block_cipher.h.

         {
         return decrypt_n(&block[0], &block[0], block.size() / block_size());
         }
template<typename Alloc , typename Alloc2 >
void Botan::BlockCipher::decrypt ( const std::vector< byte, Alloc > &  in,
std::vector< byte, Alloc2 > &  out 
) const [inline, inherited]

Decrypt one or more blocks

Parameters:
inthe input buffer (multiple of block_size())
outthe output buffer (same size as in)

Definition at line 116 of file block_cipher.h.

         {
         return decrypt_n(&in[0], &out[0], in.size() / block_size());
         }
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 128 of file safer_sk.cpp.

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

   {
   for(size_t i = 0; i != blocks; ++i)
      {
      byte A = in[0], B = in[1], C = in[2], D = in[3],
           E = in[4], F = in[5], G = in[6], H = in[7];

      A ^= EK[16*rounds+0]; B -= EK[16*rounds+1]; C -= EK[16*rounds+2];
      D ^= EK[16*rounds+3]; E ^= EK[16*rounds+4]; F -= EK[16*rounds+5];
      G -= EK[16*rounds+6]; H ^= EK[16*rounds+7];

      for(s32bit j = 16*(rounds-1); j >= 0; j -= 16)
         {
         byte T = E; E = B; B = C; C = T; T = F; F = D; D = G; G = T;
         A -= E; B -= F; C -= G; D -= H; E -= A; F -= B; G -= C; H -= D;
         A -= C; E -= G; B -= D; F -= H; C -= A; G -= E; D -= B; H -= F;
         A -= B; C -= D; E -= F; G -= H; B -= A; D -= C; F -= E; H -= G;

         A = LOG[A - EK[j+8 ] + 256]; B = EXP[B ^ EK[j+9 ]];
         C = EXP[C ^ EK[j+10]];       D = LOG[D - EK[j+11] + 256];
         E = LOG[E - EK[j+12] + 256]; F = EXP[F ^ EK[j+13]];
         G = EXP[G ^ EK[j+14]];       H = LOG[H - EK[j+15] + 256];

         A ^= EK[j+0]; B -= EK[j+1]; C -= EK[j+2]; D ^= EK[j+3];
         E ^= EK[j+4]; F -= EK[j+5]; G -= EK[j+6]; H ^= EK[j+7];
         }

      out[0] = A; out[1] = B; out[2] = C; out[3] = D;
      out[4] = E; out[5] = F; out[6] = G; out[7] = H;

      in += BLOCK_SIZE;
      out += BLOCK_SIZE;
      }
   }
void Botan::BlockCipher::encrypt ( const byte  in[],
byte  out[] 
) const [inline, inherited]

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 49 of file block_cipher.h.

Referenced by Botan::aont_package(), Botan::aont_unpackage(), Botan::Camellia_128::encrypt_n(), Botan::DESX::encrypt_n(), Botan::Camellia_192::encrypt_n(), Botan::Camellia_256::encrypt_n(), Botan::XTS_Encryption::finish(), Botan::CTS_Encryption::finish(), Botan::CFB_Encryption::update(), Botan::CBC_Encryption::update(), and Botan::CFB_Decryption::update().

         { encrypt_n(in, out, 1); }
void Botan::BlockCipher::encrypt ( byte  block[]) const [inline, inherited]

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 68 of file block_cipher.h.

{ encrypt_n(block, block, 1); }
template<typename Alloc >
void Botan::BlockCipher::encrypt ( std::vector< byte, Alloc > &  block) const [inline, inherited]

Encrypt one or more blocks

Parameters:
blockthe input/output buffer (multiple of block_size())

Definition at line 83 of file block_cipher.h.

         {
         return encrypt_n(&block[0], &block[0], block.size() / block_size());
         }
template<typename Alloc , typename Alloc2 >
void Botan::BlockCipher::encrypt ( const std::vector< byte, Alloc > &  in,
std::vector< byte, Alloc2 > &  out 
) const [inline, inherited]

Encrypt one or more blocks

Parameters:
inthe input buffer (multiple of block_size())
outthe output buffer (same size as in)

Definition at line 104 of file block_cipher.h.

         {
         return encrypt_n(&in[0], &out[0], in.size() / block_size());
         }
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 92 of file safer_sk.cpp.

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

   {
   for(size_t i = 0; i != blocks; ++i)
      {
      byte A = in[0], B = in[1], C = in[2], D = in[3],
           E = in[4], F = in[5], G = in[6], H = in[7], X, Y;

      for(size_t j = 0; j != 16*rounds; j += 16)
         {
         A = EXP[A ^ EK[j  ]]; B = LOG[B + EK[j+1]];
         C = LOG[C + EK[j+2]]; D = EXP[D ^ EK[j+3]];
         E = EXP[E ^ EK[j+4]]; F = LOG[F + EK[j+5]];
         G = LOG[G + EK[j+6]]; H = EXP[H ^ EK[j+7]];

         A += EK[j+ 8]; B ^= EK[j+ 9]; C ^= EK[j+10]; D += EK[j+11];
         E += EK[j+12]; F ^= EK[j+13]; G ^= EK[j+14]; H += EK[j+15];

         B += A; D += C; F += E; H += G; A += B; C += D; E += F; G += H;
         C += A; G += E; D += B; H += F; A += C; E += G; B += D; F += H;
         H += D; Y = D + H; D = B + F; X = B + D; B = A + E;
         A += B; F = C + G; E = C + F; C = X; G = Y;
         }

      out[0] = A ^ EK[16*rounds+0]; out[1] = B + EK[16*rounds+1];
      out[2] = C + EK[16*rounds+2]; out[3] = D ^ EK[16*rounds+3];
      out[4] = E ^ EK[16*rounds+4]; out[5] = F + EK[16*rounds+5];
      out[6] = G + EK[16*rounds+6]; out[7] = H ^ EK[16*rounds+7];

      in += BLOCK_SIZE;
      out += BLOCK_SIZE;
      }
   }
Key_Length_Specification Botan::Block_Cipher_Fixed_Params< BS, KMIN, 0 , 1 >::key_spec ( ) const [inline, virtual, inherited]
Returns:
object describing limits on key size

Implements Botan::SymmetricAlgorithm.

Definition at line 156 of file block_cipher.h.

         {
         return Key_Length_Specification(KMIN, KMAX, KMOD);
         }
size_t Botan::SymmetricAlgorithm::maximum_keylength ( ) const [inline, inherited]
Returns:
minimum allowed key length

Definition at line 36 of file sym_algo.h.

References Botan::Key_Length_Specification::maximum_keylength().

         {
         return key_spec().maximum_keylength();
         }
size_t Botan::SymmetricAlgorithm::minimum_keylength ( ) const [inline, inherited]
Returns:
maxmium allowed key length

Definition at line 44 of file sym_algo.h.

         {
         return key_spec().minimum_keylength();
         }
std::string Botan::SAFER_SK::name ( ) const [virtual]

Implements Botan::SymmetricAlgorithm.

Definition at line 235 of file safer_sk.cpp.

References Botan::ASN1::to_string().

Referenced by SAFER_SK().

   {
   return "SAFER-SK(" + std::to_string(rounds) + ")";
   }
size_t Botan::BlockCipher::parallel_bytes ( ) const [inline, inherited]
Returns:
prefererred parallelism of this cipher in bytes

Definition at line 37 of file block_cipher.h.

Referenced by Botan::XTS_Mode::update_granularity(), Botan::CBC_Mode::update_granularity(), and Botan::ECB_Mode::update_granularity().

         {
         return parallelism() * block_size() * BOTAN_BLOCK_CIPHER_PAR_MULT;
         }
virtual size_t Botan::BlockCipher::parallelism ( ) const [inline, virtual, inherited]
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 32 of file block_cipher.h.

{ return 1; }
void Botan::SymmetricAlgorithm::set_key ( const SymmetricKey key) [inline, inherited]

Set the symmetric key of this object.

Parameters:
keythe SymmetricKey to be set.

Definition at line 63 of file sym_algo.h.

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

Referenced by Botan::aont_package(), Botan::aont_unpackage(), botan_mac_set_key(), Botan::TLS::Session::decrypt(), Botan::TLS::Session::encrypt(), and Botan::pbkdf2().

         {
         set_key(key.begin(), key.length());
         }
template<typename Alloc >
void Botan::SymmetricAlgorithm::set_key ( const std::vector< byte, Alloc > &  key) [inline, inherited]

Definition at line 69 of file sym_algo.h.

         {
         set_key(&key[0], key.size());
         }
void Botan::SymmetricAlgorithm::set_key ( const byte  key[],
size_t  length 
) [inline, 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 79 of file sym_algo.h.

         {
         if(!valid_keylength(length))
            throw Invalid_Key_Length(name(), length);
         key_schedule(key, length);
         }
bool Botan::SymmetricAlgorithm::valid_keylength ( size_t  length) const [inline, inherited]

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 54 of file sym_algo.h.

Referenced by Botan::aont_package(), and Botan::aont_unpackage().

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

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